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|
/*
* GNU AFFERO GENERAL PUBLIC LICENSE
* Version 3, 19 November 2007
* Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
* Everyone is permitted to copy and distribute verbatim copies
* of this license document, but changing it is not allowed.
*/
// Port from: https://github.com/cyotek/Cyotek.Windows.Forms.ImageBox to AvaloniaUI
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Runtime.CompilerServices;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.Presenters;
using Avalonia.Controls.Primitives;
using Avalonia.Input;
using Avalonia.Markup.Xaml;
using Avalonia.Media;
using Avalonia.Media.Imaging;
using Avalonia.Platform;
using Bitmap = Avalonia.Media.Imaging.Bitmap;
using Color = Avalonia.Media.Color;
using Pen = Avalonia.Media.Pen;
using Point = Avalonia.Point;
using Size = Avalonia.Size;
namespace UVtools.AvaloniaControls
{
public class AdvancedImageBox : UserControl
{
#region Bindable Base
/// <summary>
/// Multicast event for property change notifications.
/// </summary>
private PropertyChangedEventHandler _propertyChanged;
public new event PropertyChangedEventHandler PropertyChanged
{
add => _propertyChanged += value;
remove => _propertyChanged -= value;
}
protected bool RaiseAndSetIfChanged<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
{
if (EqualityComparer<T>.Default.Equals(field, value)) return false;
field = value;
RaisePropertyChanged(propertyName);
return true;
}
protected virtual void OnPropertyChanged(PropertyChangedEventArgs e)
{
}
/// <summary>
/// Notifies listeners that a property value has changed.
/// </summary>
/// <param name="propertyName">
/// Name of the property used to notify listeners. This
/// value is optional and can be provided automatically when invoked from compilers
/// that support <see cref="CallerMemberNameAttribute" />.
/// </param>
protected void RaisePropertyChanged([CallerMemberName] string propertyName = null)
{
var e = new PropertyChangedEventArgs(propertyName);
OnPropertyChanged(e);
_propertyChanged?.Invoke(this, e);
}
#endregion
#region Sub Classes
/// <summary>
/// Represents available levels of zoom in an <see cref="ImageBox"/> control
/// </summary>
public class ZoomLevelCollection : IList<int>
{
#region Public Constructors
/// <summary>
/// Initializes a new instance of the <see cref="ZoomLevelCollection"/> class.
/// </summary>
public ZoomLevelCollection()
{
List = new SortedList<int, int>();
}
/// <summary>
/// Initializes a new instance of the <see cref="ZoomLevelCollection"/> class.
/// </summary>
/// <param name="collection">The default values to populate the collection with.</param>
/// <exception cref="System.ArgumentNullException">Thrown if the <c>collection</c> parameter is null</exception>
public ZoomLevelCollection(IEnumerable<int> collection)
: this()
{
if (collection == null)
{
throw new ArgumentNullException(nameof(collection));
}
AddRange(collection);
}
#endregion
#region Public Class Properties
/// <summary>
/// Returns the default zoom levels
/// </summary>
public static ZoomLevelCollection Default =>
new(new[] {
7, 10, 15, 20, 25, 30, 50, 70, 100, 150, 200, 300, 400, 500, 600, 700, 800, 1200, 1600, 3200
});
#endregion
#region Public Properties
/// <summary>
/// Gets the number of elements contained in the <see cref="ZoomLevelCollection" />.
/// </summary>
/// <returns>
/// The number of elements contained in the <see cref="ZoomLevelCollection" />.
/// </returns>
public int Count => List.Count;
/// <summary>
/// Gets a value indicating whether the <see cref="T:System.Collections.Generic.ICollection`1" /> is read-only.
/// </summary>
/// <value><c>true</c> if this instance is read only; otherwise, <c>false</c>.</value>
/// <returns>true if the <see cref="T:System.Collections.Generic.ICollection`1" /> is read-only; otherwise, false.
/// </returns>
public bool IsReadOnly => false;
/// <summary>
/// Gets or sets the zoom level at the specified index.
/// </summary>
/// <param name="index">The index.</param>
public int this[int index]
{
get => List.Values[index];
set
{
List.RemoveAt(index);
Add(value);
}
}
#endregion
#region Protected Properties
/// <summary>
/// Gets or sets the backing list.
/// </summary>
protected SortedList<int, int> List { get; set; }
#endregion
#region Public Members
/// <summary>
/// Adds an item to the <see cref="T:System.Collections.Generic.ICollection`1" />.
/// </summary>
/// <param name="item">The object to add to the <see cref="T:System.Collections.Generic.ICollection`1" />.</param>
public void Add(int item)
{
List.Add(item, item);
}
/// <summary>
/// Adds a range of items to the <see cref="ZoomLevelCollection"/>.
/// </summary>
/// <param name="collection">The items to add to the collection.</param>
/// <exception cref="System.ArgumentNullException">Thrown if the <c>collection</c> parameter is null.</exception>
public void AddRange(IEnumerable<int> collection)
{
if (collection == null)
{
throw new ArgumentNullException(nameof(collection));
}
foreach (int value in collection)
{
Add(value);
}
}
/// <summary>
/// Removes all items from the <see cref="T:System.Collections.Generic.ICollection`1" />.
/// </summary>
public void Clear()
{
List.Clear();
}
/// <summary>
/// Determines whether the <see cref="T:System.Collections.Generic.ICollection`1" /> contains a specific value.
/// </summary>
/// <param name="item">The object to locate in the <see cref="T:System.Collections.Generic.ICollection`1" />.</param>
/// <returns>true if <paramref name="item" /> is found in the <see cref="T:System.Collections.Generic.ICollection`1" />; otherwise, false.</returns>
public bool Contains(int item)
{
return List.ContainsKey(item);
}
/// <summary>
/// Copies a range of elements this collection into a destination <see cref="Array"/>.
/// </summary>
/// <param name="array">The <see cref="Array"/> that receives the data.</param>
/// <param name="arrayIndex">A 64-bit integer that represents the index in the <see cref="Array"/> at which storing begins.</param>
public void CopyTo(int[] array, int arrayIndex)
{
for (int i = 0; i < Count; i++)
{
array[arrayIndex + i] = List.Values[i];
}
}
/// <summary>
/// Finds the index of a zoom level matching or nearest to the specified value.
/// </summary>
/// <param name="zoomLevel">The zoom level.</param>
public int FindNearest(int zoomLevel)
{
int nearestValue = List.Values[0];
int nearestDifference = Math.Abs(nearestValue - zoomLevel);
for (int i = 1; i < Count; i++)
{
int value = List.Values[i];
int difference = Math.Abs(value - zoomLevel);
if (difference < nearestDifference)
{
nearestValue = value;
nearestDifference = difference;
}
}
return nearestValue;
}
/// <summary>
/// Returns an enumerator that iterates through the collection.
/// </summary>
/// <returns>A <see cref="T:System.Collections.Generic.IEnumerator`1" /> that can be used to iterate through the collection.</returns>
public IEnumerator<int> GetEnumerator()
{
return List.Values.GetEnumerator();
}
/// <summary>
/// Determines the index of a specific item in the <see cref="T:System.Collections.Generic.IList`1" />.
/// </summary>
/// <param name="item">The object to locate in the <see cref="T:System.Collections.Generic.IList`1" />.</param>
/// <returns>The index of <paramref name="item" /> if found in the list; otherwise, -1.</returns>
public int IndexOf(int item)
{
return List.IndexOfKey(item);
}
/// <summary>
/// Not implemented.
/// </summary>
/// <param name="index">The index.</param>
/// <param name="item">The item.</param>
/// <exception cref="System.NotImplementedException">Not implemented</exception>
public void Insert(int index, int item)
{
throw new NotImplementedException();
}
/// <summary>
/// Returns the next increased zoom level for the given current zoom.
/// </summary>
/// <param name="zoomLevel">The current zoom level.</param>
/// <returns>The next matching increased zoom level for the given current zoom if applicable, otherwise the nearest zoom.</returns>
public int NextZoom(int zoomLevel)
{
var index = IndexOf(FindNearest(zoomLevel));
if (index < Count - 1)
{
index++;
}
return this[index];
}
/// <summary>
/// Returns the next decreased zoom level for the given current zoom.
/// </summary>
/// <param name="zoomLevel">The current zoom level.</param>
/// <returns>The next matching decreased zoom level for the given current zoom if applicable, otherwise the nearest zoom.</returns>
public int PreviousZoom(int zoomLevel)
{
var index = IndexOf(FindNearest(zoomLevel));
if (index > 0)
{
index--;
}
return this[index];
}
/// <summary>
/// Removes the first occurrence of a specific object from the <see cref="T:System.Collections.Generic.ICollection`1" />.
/// </summary>
/// <param name="item">The object to remove from the <see cref="T:System.Collections.Generic.ICollection`1" />.</param>
/// <returns>true if <paramref name="item" /> was successfully removed from the <see cref="T:System.Collections.Generic.ICollection`1" />; otherwise, false. This method also returns false if <paramref name="item" /> is not found in the original <see cref="T:System.Collections.Generic.ICollection`1" />.</returns>
public bool Remove(int item)
{
return List.Remove(item);
}
/// <summary>
/// Removes the element at the specified index of the <see cref="ZoomLevelCollection"/>.
/// </summary>
/// <param name="index">The zero-based index of the element to remove.</param>
public void RemoveAt(int index)
{
List.RemoveAt(index);
}
/// <summary>
/// Copies the elements of the <see cref="ZoomLevelCollection"/> to a new array.
/// </summary>
/// <returns>An array containing copies of the elements of the <see cref="ZoomLevelCollection"/>.</returns>
public int[] ToArray()
{
int[] results;
results = new int[Count];
CopyTo(results, 0);
return results;
}
#endregion
#region IList<int> Members
/// <summary>
/// Returns an enumerator that iterates through a collection.
/// </summary>
/// <returns>An <see cref="ZoomLevelCollection" /> object that can be used to iterate through the collection.</returns>
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
#endregion
}
#endregion
#region Enums
/// <summary>
/// Determines the sizing mode of an image hosted in an <see cref="AdvancedImageBox" /> control.
/// </summary>
public enum SizeModes : byte
{
/// <summary>
/// The image is displayed according to current zoom and scroll properties.
/// </summary>
Normal,
/// <summary>
/// The image is stretched to fill the client area of the control.
/// </summary>
Stretch,
/// <summary>
/// The image is stretched to fill as much of the client area of the control as possible, whilst retaining the same aspect ratio for the width and height.
/// </summary>
Fit
}
[Flags]
public enum MouseButtons : byte
{
None = 0,
LeftButton = 1,
MiddleButton = 2,
RightButton = 4
}
/// <summary>
/// Describes the zoom action occuring
/// </summary>
[Flags]
public enum ZoomActions : byte
{
/// <summary>
/// No action.
/// </summary>
None = 0,
/// <summary>
/// The control is increasing the zoom.
/// </summary>
ZoomIn = 1,
/// <summary>
/// The control is decreasing the zoom.
/// </summary>
ZoomOut = 2,
/// <summary>
/// The control zoom was reset.
/// </summary>
ActualSize = 4
}
public enum SelectionModes
{
/// <summary>
/// No selection.
/// </summary>
None,
/// <summary>
/// Rectangle selection.
/// </summary>
Rectangle,
/// <summary>
/// Zoom selection.
/// </summary>
Zoom
}
#endregion
#region UI Controls
public ScrollBar HorizontalScrollBar { get; }
public ScrollBar VerticalScrollBar { get; }
public ContentPresenter ViewPort { get; }
public Vector Offset
{
get => new(HorizontalScrollBar.Value, VerticalScrollBar.Value);
set
{
HorizontalScrollBar.Value = value.X;
VerticalScrollBar.Value = value.Y;
RaisePropertyChanged();
TriggerRender();
}
}
public Size ViewPortSize => ViewPort.Bounds.Size;
#endregion
#region Private Members
private Point _startMousePosition;
private Vector _startScrollPosition;
private bool _isPanning;
private bool _isSelecting;
private Bitmap _trackerImage;
private bool _canRender = true;
private Point _pointerPosition;
#endregion
#region Properties
public static readonly DirectProperty<AdvancedImageBox, bool> CanRenderProperty =
AvaloniaProperty.RegisterDirect<AdvancedImageBox, bool>(
nameof(CanRender),
o => o.CanRender);
/// <summary>
/// Gets or sets if control can render the image
/// </summary>
public bool CanRender
{
get => _canRender;
set
{
if (!SetAndRaise(CanRenderProperty, ref _canRender, value)) return;
if (_canRender) TriggerRender();
}
}
public static readonly StyledProperty<byte> GridCellSizeProperty =
AvaloniaProperty.Register<AdvancedImageBox, byte>(nameof(GridCellSize), 15);
/// <summary>
/// Gets or sets the grid cell size
/// </summary>
public byte GridCellSize
{
get => GetValue(GridCellSizeProperty);
set => SetValue(GridCellSizeProperty, value);
}
public static readonly StyledProperty<ISolidColorBrush> GridColorProperty =
AvaloniaProperty.Register<AdvancedImageBox, ISolidColorBrush>(nameof(GridColor), Brushes.Gainsboro);
/// <summary>
/// Gets or sets the color used to create the checkerboard style background
/// </summary>
public ISolidColorBrush GridColor
{
get => GetValue(GridColorProperty);
set => SetValue(GridColorProperty, value);
}
public static readonly StyledProperty<ISolidColorBrush> GridColorAlternateProperty =
AvaloniaProperty.Register<AdvancedImageBox, ISolidColorBrush>(nameof(GridColorAlternate), Brushes.White);
/// <summary>
/// Gets or sets the color used to create the checkerboard style background
/// </summary>
public ISolidColorBrush GridColorAlternate
{
get => GetValue(GridColorAlternateProperty);
set => SetValue(GridColorAlternateProperty, value);
}
public static readonly StyledProperty<Bitmap> ImageProperty =
AvaloniaProperty.Register<AdvancedImageBox, Bitmap>(nameof(Image));
/// <summary>
/// Gets or sets the image to be displayed
/// </summary>
public Bitmap Image
{
get => GetValue(ImageProperty);
set
{
SetValue(ImageProperty, value);
if (value is null)
{
SelectNone();
}
UpdateViewPort();
TriggerRender();
RaisePropertyChanged(nameof(IsImageLoaded));
}
}
public WriteableBitmap ImageAsWriteableBitmap => (WriteableBitmap) Image;
public bool IsImageLoaded => Image is not null;
public static readonly DirectProperty<AdvancedImageBox, Bitmap> TrackerImageProperty =
AvaloniaProperty.RegisterDirect<AdvancedImageBox, Bitmap>(
nameof(TrackerImage),
o => o.TrackerImage,
(o, v) => o.TrackerImage = v);
/// <summary>
/// Gets or sets an image to follow the mouse pointer
/// </summary>
public Bitmap TrackerImage
{
get => _trackerImage;
set
{
if (!SetAndRaise(TrackerImageProperty, ref _trackerImage, value)) return;
TriggerRender();
RaisePropertyChanged(nameof(HaveTrackerImage));
}
}
public bool HaveTrackerImage => _trackerImage is not null;
public static readonly StyledProperty<bool> TrackerImageAutoZoomProperty =
AvaloniaProperty.Register<AdvancedImageBox, bool>(nameof(TrackerImageAutoZoom), true);
/// <summary>
/// Gets or sets if the tracker image will be scaled to the current zoom
/// </summary>
public bool TrackerImageAutoZoom
{
get => GetValue(TrackerImageAutoZoomProperty);
set => SetValue(TrackerImageAutoZoomProperty, value);
}
public bool IsHorizontalBarVisible
{
get
{
if (Image is null) return false;
if (SizeMode != SizeModes.Normal) return false;
return ScaledImageWidth > ViewPortSize.Width;
}
}
public bool IsVerticalBarVisible
{
get
{
if (Image is null) return false;
if (SizeMode != SizeModes.Normal) return false;
return ScaledImageHeight > ViewPortSize.Height;
}
}
public static readonly StyledProperty<bool> ShowGridProperty =
AvaloniaProperty.Register<AdvancedImageBox, bool>(nameof(ShowGrid), true);
/// <summary>
/// Gets or sets the grid visibility when reach high zoom levels
/// </summary>
public bool ShowGrid
{
get => GetValue(ShowGridProperty);
set => SetValue(ShowGridProperty, value);
}
public static readonly DirectProperty<AdvancedImageBox, Point> PointerPositionProperty =
AvaloniaProperty.RegisterDirect<AdvancedImageBox, Point>(
nameof(PointerPosition),
o => o.PointerPosition);
/// <summary>
/// Gets the current pointer position
/// </summary>
public Point PointerPosition
{
get => _pointerPosition;
private set => SetAndRaise(PointerPositionProperty, ref _pointerPosition, value);
}
public static readonly DirectProperty<AdvancedImageBox, bool> IsPanningProperty =
AvaloniaProperty.RegisterDirect<AdvancedImageBox, bool>(
nameof(IsPanning),
o => o.IsPanning);
/// <summary>
/// Gets if control is currently panning
/// </summary>
public bool IsPanning
{
get => _isPanning;
protected set
{
if (!SetAndRaise(IsPanningProperty, ref _isPanning, value)) return;
_startScrollPosition = Offset;
if (value)
{
Cursor = new Cursor(StandardCursorType.SizeAll);
//this.OnPanStart(EventArgs.Empty);
}
else
{
Cursor = Cursor.Default;
//this.OnPanEnd(EventArgs.Empty);
}
}
}
public static readonly DirectProperty<AdvancedImageBox, bool> IsSelectingProperty =
AvaloniaProperty.RegisterDirect<AdvancedImageBox, bool>(
nameof(IsSelecting),
o => o.IsSelecting);
/// <summary>
/// Gets if control is currently selecting a ROI
/// </summary>
public bool IsSelecting
{
get => _isSelecting;
protected set => SetAndRaise(IsSelectingProperty, ref _isSelecting, value);
}
/// <summary>
/// Gets the center point of the viewport
/// </summary>
public Point CenterPoint
{
get
{
var viewport = GetImageViewPort();
return new(viewport.Width / 2, viewport.Height / 2);
}
}
public static readonly StyledProperty<bool> AutoPanProperty =
AvaloniaProperty.Register<AdvancedImageBox, bool>(nameof(AutoPan), true);
/// <summary>
/// Gets or sets if the control can pan with the mouse
/// </summary>
public bool AutoPan
{
get => GetValue(AutoPanProperty);
set => SetValue(AutoPanProperty, value);
}
public static readonly StyledProperty<MouseButtons> PanWithMouseButtonsProperty =
AvaloniaProperty.Register<AdvancedImageBox, MouseButtons>(nameof(PanWithMouseButtons), MouseButtons.LeftButton | MouseButtons.MiddleButton | MouseButtons.RightButton);
/// <summary>
/// Gets or sets the mouse buttons to pan the image
/// </summary>
public MouseButtons PanWithMouseButtons
{
get => GetValue(PanWithMouseButtonsProperty);
set => SetValue(PanWithMouseButtonsProperty, value);
}
public static readonly StyledProperty<bool> PanWithArrowsProperty =
AvaloniaProperty.Register<AdvancedImageBox, bool>(nameof(PanWithArrows), true);
/// <summary>
/// Gets or sets if the control can pan with the keyboard arrows
/// </summary>
public bool PanWithArrows
{
get => GetValue(PanWithArrowsProperty);
set => SetValue(PanWithArrowsProperty, value);
}
public static readonly StyledProperty<MouseButtons> SelectWithMouseButtonsProperty =
AvaloniaProperty.Register<AdvancedImageBox, MouseButtons>(nameof(SelectWithMouseButtons), MouseButtons.LeftButton | MouseButtons.RightButton);
/// <summary>
/// Gets or sets the mouse buttons to select a region on image
/// </summary>
public MouseButtons SelectWithMouseButtons
{
get => GetValue(SelectWithMouseButtonsProperty);
set => SetValue(SelectWithMouseButtonsProperty, value);
}
public static readonly StyledProperty<bool> InvertMousePanProperty =
AvaloniaProperty.Register<AdvancedImageBox, bool>(nameof(InvertMousePan), false);
/// <summary>
/// Gets or sets if mouse pan is inverted
/// </summary>
public bool InvertMousePan
{
get => GetValue(InvertMousePanProperty);
set => SetValue(InvertMousePanProperty, value);
}
public static readonly StyledProperty<bool> AutoCenterProperty =
AvaloniaProperty.Register<AdvancedImageBox, bool>(nameof(AutoCenter), true);
/// <summary>
/// Gets or sets if image is auto centered
/// </summary>
public bool AutoCenter
{
get => GetValue(AutoCenterProperty);
set => SetValue(AutoCenterProperty, value);
}
public static readonly StyledProperty<SizeModes> SizeModeProperty =
AvaloniaProperty.Register<AdvancedImageBox, SizeModes>(nameof(SizeMode), SizeModes.Normal);
/// <summary>
/// Gets or sets the image size mode
/// </summary>
public SizeModes SizeMode
{
get => GetValue(SizeModeProperty);
set
{
SetValue(SizeModeProperty, value);
SizeModeChanged();
RaisePropertyChanged(nameof(IsHorizontalBarVisible));
RaisePropertyChanged(nameof(IsVerticalBarVisible));
}
}
private void SizeModeChanged()
{
switch (SizeMode)
{
case SizeModes.Normal:
HorizontalScrollBar.Visibility = ScrollBarVisibility.Auto;
VerticalScrollBar.Visibility = ScrollBarVisibility.Auto;
break;
case SizeModes.Stretch:
case SizeModes.Fit:
HorizontalScrollBar.Visibility = ScrollBarVisibility.Hidden;
VerticalScrollBar.Visibility = ScrollBarVisibility.Hidden;
break;
default:
throw new ArgumentOutOfRangeException(nameof(SizeMode), SizeMode, null);
}
}
public static readonly StyledProperty<bool> AllowZoomProperty =
AvaloniaProperty.Register<AdvancedImageBox, bool>(nameof(AllowZoom), true);
/// <summary>
/// Gets or sets if zoom is allowed
/// </summary>
public bool AllowZoom
{
get => GetValue(AllowZoomProperty);
set => SetValue(AllowZoomProperty, value);
}
public static readonly DirectProperty<AdvancedImageBox, ZoomLevelCollection> ZoomLevelsProperty =
AvaloniaProperty.RegisterDirect<AdvancedImageBox, ZoomLevelCollection>(
nameof(ZoomLevels),
o => o.ZoomLevels,
(o, v) => o.ZoomLevels = v);
ZoomLevelCollection _zoomLevels = ZoomLevelCollection.Default;
/// <summary>
/// Gets or sets the zoom levels.
/// </summary>
/// <value>The zoom levels.</value>
public ZoomLevelCollection ZoomLevels
{
get => _zoomLevels;
set => SetAndRaise(ZoomLevelsProperty, ref _zoomLevels, value);
}
public static readonly StyledProperty<int> MinZoomProperty =
AvaloniaProperty.Register<AdvancedImageBox, int>(nameof(MinZoom), 10);
/// <summary>
/// Gets or sets the minimum possible zoom.
/// </summary>
/// <value>The zoom.</value>
public int MinZoom
{
get => GetValue(MinZoomProperty);
set => SetValue(MinZoomProperty, value);
}
public static readonly StyledProperty<int> MaxZoomProperty =
AvaloniaProperty.Register<AdvancedImageBox, int>(nameof(MaxZoom), 3500);
/// <summary>
/// Gets or sets the maximum possible zoom.
/// </summary>
/// <value>The zoom.</value>
public int MaxZoom
{
get => GetValue(MaxZoomProperty);
set => SetValue(MaxZoomProperty, value);
}
public static readonly DirectProperty<AdvancedImageBox, int> OldZoomProperty =
AvaloniaProperty.RegisterDirect<AdvancedImageBox, int>(
nameof(OldZoom),
o => o.OldZoom);
private int _oldZoom = 100;
/// <summary>
/// Gets the previous zoom value
/// </summary>
/// <value>The zoom.</value>
public int OldZoom
{
get => _oldZoom;
private set => SetAndRaise(OldZoomProperty, ref _oldZoom, value);
}
public static readonly StyledProperty<int> ZoomProperty =
AvaloniaProperty.Register<AdvancedImageBox, int>(nameof(Zoom), 100);
/// <summary>
/// Gets or sets the zoom.
/// </summary>
/// <value>The zoom.</value>
public int Zoom
{
get => GetValue(ZoomProperty);
set
{
var newZoom = Math.Clamp(value, MinZoom, MaxZoom);
var previousZoom = Zoom;
if (previousZoom == newZoom) return;
OldZoom = previousZoom;
SetValue(ZoomProperty, value);
UpdateViewPort();
TriggerRender();
RaisePropertyChanged(nameof(IsHorizontalBarVisible));
RaisePropertyChanged(nameof(IsVerticalBarVisible));
}
}
public bool IsActualSize => Zoom == 100;
/// <summary>
/// Gets the zoom factor, the zoom / 100
/// </summary>
public double ZoomFactor => Zoom / 100.0;
/// <summary>
/// Gets the width of the scaled image.
/// </summary>
/// <value>The width of the scaled image.</value>
public double ScaledImageWidth => Image.Size.Width * ZoomFactor;
/// <summary>
/// Gets the height of the scaled image.
/// </summary>
/// <value>The height of the scaled image.</value>
public double ScaledImageHeight => Image.Size.Height * ZoomFactor;
public static readonly StyledProperty<ISolidColorBrush> PixelGridColorProperty =
AvaloniaProperty.Register<AdvancedImageBox, ISolidColorBrush>(nameof(PixelGridColor), Brushes.DimGray);
/// <summary>
/// Gets or sets the color of the pixel grid.
/// </summary>
/// <value>The color of the pixel grid.</value>
public ISolidColorBrush PixelGridColor
{
get => GetValue(PixelGridColorProperty);
set => SetValue(PixelGridColorProperty, value);
}
public static readonly StyledProperty<int> PixelGridZoomThresholdProperty =
AvaloniaProperty.Register<AdvancedImageBox, int>(nameof(PixelGridZoomThreshold), 5);
/// <summary>
/// Gets or sets the minimum size of zoomed pixel's before the pixel grid will be drawn
/// </summary>
/// <value>The pixel grid threshold.</value>
public int PixelGridZoomThreshold
{
get => GetValue(PixelGridZoomThresholdProperty);
set => SetValue(PixelGridZoomThresholdProperty, value);
}
public static readonly StyledProperty<SelectionModes> SelectionModeProperty =
AvaloniaProperty.Register<AdvancedImageBox, SelectionModes>(nameof(SelectionMode), SelectionModes.None);
public SelectionModes SelectionMode
{
get => GetValue(SelectionModeProperty);
set => SetValue(SelectionModeProperty, value);
}
public static readonly StyledProperty<ISolidColorBrush> SelectionColorProperty =
AvaloniaProperty.Register<AdvancedImageBox, ISolidColorBrush>(nameof(SelectionColor), new SolidColorBrush(new Color(127, 0, 128, 255)));
public ISolidColorBrush SelectionColor
{
get => GetValue(SelectionColorProperty);
set => SetValue(SelectionColorProperty, value);
}
public static readonly StyledProperty<Rect> SelectionRegionProperty =
AvaloniaProperty.Register<AdvancedImageBox, Rect>(nameof(SelectionRegion), Rect.Empty);
public Rect SelectionRegion
{
get => GetValue(SelectionRegionProperty);
set
{
SetValue(SelectionRegionProperty, value);
//if (!RaiseAndSetIfChanged(ref _selectionRegion, value)) return;
TriggerRender();
RaisePropertyChanged(nameof(HaveSelection));
RaisePropertyChanged(nameof(SelectionRegionNet));
RaisePropertyChanged(nameof(SelectionPixelSize));
}
}
public Rectangle SelectionRegionNet
{
get
{
var rect = SelectionRegion;
return new Rectangle((int) Math.Ceiling(rect.X), (int)Math.Ceiling(rect.Y),
(int)rect.Width, (int)rect.Height);
}
}
public PixelSize SelectionPixelSize
{
get
{
var rect = SelectionRegion;
return new PixelSize((int) rect.Width, (int) rect.Height);
}
}
public bool HaveSelection => !SelectionRegion.IsEmpty;
#endregion
#region Constructor
public AdvancedImageBox()
{
InitializeComponent();
FocusableProperty.OverrideDefaultValue(typeof(AdvancedImageBox), true);
AffectsRender<AdvancedImageBox>(ShowGridProperty);
HorizontalScrollBar = this.FindControl<ScrollBar>("HorizontalScrollBar");
VerticalScrollBar = this.FindControl<ScrollBar>("VerticalScrollBar");
ViewPort = this.FindControl<ContentPresenter>("ViewPort");
SizeModeChanged();
HorizontalScrollBar.Scroll += ScrollBarOnScroll;
VerticalScrollBar.Scroll += ScrollBarOnScroll;
ViewPort.PointerWheelChanged += FillContainerOnPointerWheelChanged;
}
private void InitializeComponent()
{
AvaloniaXamlLoader.Load(this);
}
#endregion
#region Render methods
public void TriggerRender(bool renderOnlyCursorTracker = false)
{
if (!_canRender) return;
if (renderOnlyCursorTracker && _trackerImage is null) return;
InvalidateVisual();
}
public override void Render(DrawingContext context)
{
//Debug.WriteLine($"Render: {DateTime.Now.Ticks}");
base.Render(context);
// Draw Grid
var gridCellSize = GridCellSize;
if (ShowGrid & gridCellSize > 0 && (!IsHorizontalBarVisible || !IsVerticalBarVisible))
{
// draw the background
var gridColor = GridColor;
var altColor = GridColorAlternate;
var currentColor = gridColor;
for (int y = 0; y < ViewPortSize.Height; y += gridCellSize)
{
var firstRowColor = currentColor;
for (int x = 0; x < ViewPortSize.Width; x += gridCellSize)
{
context.FillRectangle(currentColor, new Rect(x, y, gridCellSize, gridCellSize));
currentColor = ReferenceEquals(currentColor, gridColor) ? altColor : gridColor;
}
if (Equals(firstRowColor, currentColor))
currentColor = ReferenceEquals(currentColor, gridColor) ? altColor : gridColor;
}
}
/*else
{
context.FillRectangle(Background, new Rect(0, 0, Viewport.Width, Viewport.Height));
}*/
var image = Image;
if (image is null) return;
// Draw iamge
context.DrawImage(image,
GetSourceImageRegion(),
GetImageViewPort()
);
var zoomFactor = ZoomFactor;
if (HaveTrackerImage && _pointerPosition.X >= 0 && _pointerPosition.Y >= 0)
{
var destSize = TrackerImageAutoZoom
? new Size(_trackerImage.Size.Width * zoomFactor, _trackerImage.Size.Height * zoomFactor)
: image.Size;
var destPos = new Point(
_pointerPosition.X - destSize.Width / 2,
_pointerPosition.Y - destSize.Height / 2
);
context.DrawImage(_trackerImage,
new Rect(destPos, destSize)
);
}
//SkiaContext.SkCanvas.dr
// Draw pixel grid
if (zoomFactor > PixelGridZoomThreshold && SizeMode == SizeModes.Normal)
{
var viewport = GetImageViewPort();
var offsetX = Offset.X % zoomFactor;
var offsetY = Offset.Y % zoomFactor;
Pen pen = new(PixelGridColor);
for (double x = viewport.X + zoomFactor - offsetX; x < viewport.Right; x += zoomFactor)
{
context.DrawLine(pen, new Point(x, viewport.X), new Point(x, viewport.Bottom));
}
for (double y = viewport.Y + zoomFactor - offsetY; y < viewport.Bottom; y += zoomFactor)
{
context.DrawLine(pen, new Point(viewport.Y, y), new Point(viewport.Right, y));
}
context.DrawRectangle(pen, viewport);
}
if (!SelectionRegion.IsEmpty)
{
var rect = GetOffsetRectangle(SelectionRegion);
var selectionColor = SelectionColor;
context.FillRectangle(selectionColor, rect);
Color color = Color.FromArgb(255, selectionColor.Color.R, selectionColor.Color.G, selectionColor.Color.B);
context.DrawRectangle(new Pen(color.ToUint32()), rect);
}
}
private bool UpdateViewPort()
{
if (Image is null)
{
HorizontalScrollBar.Maximum = 0;
VerticalScrollBar.Maximum = 0;
return true;
}
var scaledImageWidth = ScaledImageWidth;
var scaledImageHeight = ScaledImageHeight;
var width = scaledImageWidth - HorizontalScrollBar.ViewportSize;
var height = scaledImageHeight - VerticalScrollBar.ViewportSize;
//var width = scaledImageWidth <= Viewport.Width ? Viewport.Width : scaledImageWidth;
//var height = scaledImageHeight <= Viewport.Height ? Viewport.Height : scaledImageHeight;
bool changed = false;
if (Math.Abs(HorizontalScrollBar.Maximum - width) > 0.01)
{
HorizontalScrollBar.Maximum = width;
changed = true;
}
if (Math.Abs(VerticalScrollBar.Maximum - scaledImageHeight) > 0.01)
{
VerticalScrollBar.Maximum = height;
changed = true;
}
/*if (changed)
{
var newContainer = new ContentControl
{
Width = width,
Height = height
};
FillContainer.Content = SizedContainer = newContainer;
Debug.WriteLine($"Updated ViewPort: {DateTime.Now.Ticks}");
//TriggerRender();
}*/
return changed;
}
#endregion
#region Events and Overrides
private void ScrollBarOnScroll(object? sender, ScrollEventArgs e)
{
TriggerRender();
}
/*protected override void OnScrollChanged(ScrollChangedEventArgs e)
{
Debug.WriteLine($"ViewportDelta: {e.ViewportDelta} | OffsetDelta: {e.OffsetDelta} | ExtentDelta: {e.ExtentDelta}");
if (!e.ViewportDelta.IsDefault)
{
UpdateViewPort();
}
TriggerRender();
base.OnScrollChanged(e);
}*/
private void FillContainerOnPointerWheelChanged(object? sender, PointerWheelEventArgs e)
{
e.Handled = true;
if (Image is null) return;
if (AllowZoom && SizeMode == SizeModes.Normal)
{
// The MouseWheel event can contain multiple "spins" of the wheel so we need to adjust accordingly
//double spins = Math.Abs(e.Delta.Y);
//Debug.WriteLine(e.GetPosition(this));
// TODO: Really should update the source method to handle multiple increments rather than calling it multiple times
/*for (int i = 0; i < spins; i++)
{*/
ProcessMouseZoom(e.Delta.Y > 0, e.GetPosition(ViewPort));
//}
}
}
protected override void OnPointerPressed(PointerPressedEventArgs e)
{
base.OnPointerPressed(e);
if (e.Handled
|| _isPanning
|| _isSelecting
|| Image is null) return;
var pointer = e.GetCurrentPoint(this);
if (SelectionMode != SelectionModes.None)
{
if (!(
pointer.Properties.IsLeftButtonPressed && (SelectWithMouseButtons & MouseButtons.LeftButton) != 0 ||
pointer.Properties.IsMiddleButtonPressed && (SelectWithMouseButtons & MouseButtons.MiddleButton) != 0 ||
pointer.Properties.IsRightButtonPressed && (SelectWithMouseButtons & MouseButtons.RightButton) != 0
)
) return;
IsSelecting = true;
}
else
{
if (!(
pointer.Properties.IsLeftButtonPressed && (PanWithMouseButtons & MouseButtons.LeftButton) != 0 ||
pointer.Properties.IsMiddleButtonPressed && (PanWithMouseButtons & MouseButtons.MiddleButton) != 0 ||
pointer.Properties.IsRightButtonPressed && (PanWithMouseButtons & MouseButtons.RightButton) != 0
)
|| !AutoPan
|| SizeMode != SizeModes.Normal
) return;
IsPanning = true;
}
var location = pointer.Position;
if (location.X > ViewPortSize.Width) return;
if (location.Y > ViewPortSize.Height) return;
_startMousePosition = location;
}
protected override void OnPointerReleased(PointerReleasedEventArgs e)
{
base.OnPointerReleased(e);
if (e.Handled) return;
IsPanning = false;
IsSelecting = false;
}
protected override void OnPointerLeave(PointerEventArgs e)
{
base.OnPointerLeave(e);
PointerPosition = new Point(-1, -1);
TriggerRender(true);
e.Handled = true;
}
protected override void OnPointerMoved(PointerEventArgs e)
{
base.OnPointerMoved(e);
if (e.Handled) return;
var pointer = e.GetCurrentPoint(this);
PointerPosition = pointer.Position;
if (!_isPanning && !_isSelecting)
{
TriggerRender(true);
return;
}
if (_isPanning)
{
double x;
double y;
if (!InvertMousePan)
{
x = _startScrollPosition.X + (_startMousePosition.X - _pointerPosition.X);
y = _startScrollPosition.Y + (_startMousePosition.Y - _pointerPosition.Y);
}
else
{
x = (_startScrollPosition.X - (_startMousePosition.X - _pointerPosition.X));
y = (_startScrollPosition.Y - (_startMousePosition.Y - _pointerPosition.Y));
}
Offset = new Vector(x, y);
}
else if (_isSelecting)
{
double x;
double y;
double w;
double h;
var imageOffset = GetImageViewPort().Position;
if (_pointerPosition.X < _startMousePosition.X)
{
x = _pointerPosition.X;
w = _startMousePosition.X - _pointerPosition.X;
}
else
{
x = _startMousePosition.X;
w = _pointerPosition.X - _startMousePosition.X;
}
if (_pointerPosition.Y < _startMousePosition.Y)
{
y = _pointerPosition.Y;
h = _startMousePosition.Y - _pointerPosition.Y;
}
else
{
y = _startMousePosition.Y;
h = _pointerPosition.Y - _startMousePosition.Y;
}
x -= imageOffset.X - Offset.X;
y -= imageOffset.Y - Offset.Y;
var zoomFactor = ZoomFactor;
x /= zoomFactor;
y /= zoomFactor;
w /= zoomFactor;
h /= zoomFactor;
if (w != 0 && h != 0)
{
SelectionRegion = FitRectangle(new Rect(x, y, w, h));
}
}
e.Handled = true;
}
#endregion
#region Zoom and Size modes
private void ProcessMouseZoom(bool isZoomIn, Point cursorPosition)
=> PerformZoom(isZoomIn ? ZoomActions.ZoomIn : ZoomActions.ZoomOut, true, cursorPosition);
/// <summary>
/// Returns an appropriate zoom level based on the specified action, relative to the current zoom level.
/// </summary>
/// <param name="action">The action to determine the zoom level.</param>
/// <exception cref="System.ArgumentOutOfRangeException">Thrown if an unsupported action is specified.</exception>
private int GetZoomLevel(ZoomActions action)
{
var result = action switch
{
ZoomActions.None => Zoom,
ZoomActions.ZoomIn => _zoomLevels.NextZoom(Zoom),
ZoomActions.ZoomOut => _zoomLevels.PreviousZoom(Zoom),
ZoomActions.ActualSize => 100,
_ => throw new ArgumentOutOfRangeException(nameof(action), action, null),
};
return result;
}
/// <summary>
/// Resets the <see cref="SizeModes"/> property whilsts retaining the original <see cref="Zoom"/>.
/// </summary>
protected void RestoreSizeMode()
{
if (SizeMode != SizeModes.Normal)
{
var previousZoom = Zoom;
SizeMode = SizeModes.Normal;
Zoom = previousZoom; // Stop the zoom getting reset to 100% before calculating the new zoom
}
}
private void PerformZoom(ZoomActions action, bool preservePosition)
=> PerformZoom(action, preservePosition, CenterPoint);
private void PerformZoom(ZoomActions action, bool preservePosition, Point relativePoint)
{
Point currentPixel = PointToImage(relativePoint);
int currentZoom = Zoom;
int newZoom = GetZoomLevel(action);
/*if (preservePosition && Zoom != currentZoom)
CanRender = false;*/
RestoreSizeMode();
Zoom = newZoom;
if (preservePosition && Zoom != currentZoom)
{
ScrollTo(currentPixel, relativePoint);
}
}
/// <summary>
/// Zooms into the image
/// </summary>
public void ZoomIn()
=> ZoomIn(true);
/// <summary>
/// Zooms into the image
/// </summary>
/// <param name="preservePosition"><c>true</c> if the current scrolling position should be preserved relative to the new zoom level, <c>false</c> to reset.</param>
public void ZoomIn(bool preservePosition)
{
PerformZoom(ZoomActions.ZoomIn, preservePosition);
}
/// <summary>
/// Zooms out of the image
/// </summary>
public void ZoomOut()
=> ZoomOut(true);
/// <summary>
/// Zooms out of the image
/// </summary>
/// <param name="preservePosition"><c>true</c> if the current scrolling position should be preserved relative to the new zoom level, <c>false</c> to reset.</param>
public void ZoomOut(bool preservePosition)
{
PerformZoom(ZoomActions.ZoomOut, preservePosition);
}
/// <summary>
/// Zooms to the maximum size for displaying the entire image within the bounds of the control.
/// </summary>
public void ZoomToFit()
{
var image = Image;
if (image is null) return;
double zoom;
double aspectRatio;
if (image.Size.Width > image.Size.Height)
{
aspectRatio = ViewPortSize.Width / image.Size.Width;
zoom = aspectRatio * 100.0;
if (ViewPortSize.Height < image.Size.Height * zoom / 100.0)
{
aspectRatio = ViewPortSize.Height / image.Size.Height;
zoom = aspectRatio * 100.0;
}
}
else
{
aspectRatio = ViewPortSize.Height / image.Size.Height;
zoom = aspectRatio * 100.0;
if (ViewPortSize.Width < image.Size.Width * zoom / 100.0)
{
aspectRatio = ViewPortSize.Width / image.Size.Width;
zoom = aspectRatio * 100.0;
}
}
Zoom = (int)zoom;
}
/// <summary>
/// Adjusts the view port to fit the given region
/// </summary>
/// <param name="x">The X co-ordinate of the selection region.</param>
/// <param name="y">The Y co-ordinate of the selection region.</param>
/// <param name="width">The width of the selection region.</param>
/// <param name="height">The height of the selection region.</param>
/// <param name="margin">Give a margin to rectangle by a value to zoom-out that pixel value</param>
public void ZoomToRegion(double x, double y, double width, double height, double margin = 0)
{
ZoomToRegion(new Rect(x, y, width, height), margin);
}
/// <summary>
/// Adjusts the view port to fit the given region
/// </summary>
/// <param name="x">The X co-ordinate of the selection region.</param>
/// <param name="y">The Y co-ordinate of the selection region.</param>
/// <param name="width">The width of the selection region.</param>
/// <param name="height">The height of the selection region.</param>
/// <param name="margin">Give a margin to rectangle by a value to zoom-out that pixel value</param>
public void ZoomToRegion(int x, int y, int width, int height, double margin = 0)
{
ZoomToRegion(new Rect(x, y, width, height), margin);
}
/// <summary>
/// Adjusts the view port to fit the given region
/// </summary>
/// <param name="rectangle">The rectangle to fit the view port to.</param>
/// <param name="margin">Give a margin to rectangle by a value to zoom-out that pixel value</param>
public void ZoomToRegion(Rectangle rectangle, double margin = 0) =>
ZoomToRegion(rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height, margin);
/// <summary>
/// Adjusts the view port to fit the given region
/// </summary>
/// <param name="rectangle">The rectangle to fit the view port to.</param>
/// <param name="margin">Give a margin to rectangle by a value to zoom-out that pixel value</param>
public void ZoomToRegion(Rect rectangle, double margin = 0)
{
if (margin > 0) rectangle = rectangle.Inflate(margin);
var ratioX = ViewPortSize.Width / rectangle.Width;
var ratioY = ViewPortSize.Height / rectangle.Height;
var zoomFactor = Math.Min(ratioX, ratioY);
var cx = rectangle.X + rectangle.Width / 2;
var cy = rectangle.Y + rectangle.Height / 2;
CanRender = false;
Zoom = (int)(zoomFactor * 100); // This function sets the zoom so viewport will change
CenterAt(new Point(cx, cy)); // If i call this here, it will move to the wrong position due wrong viewport
}
/// <summary>
/// Zooms to current selection region
/// </summary>
public void ZoomToSelectionRegion(double margin = 0)
{
if (!HaveSelection) return;
ZoomToRegion(SelectionRegion, margin);
}
/// <summary>
/// Resets the zoom to 100%.
/// </summary>
public void PerformActualSize()
{
SizeMode = SizeModes.Normal;
//SetZoom(100, ImageZoomActions.ActualSize | (Zoom < 100 ? ImageZoomActions.ZoomIn : ImageZoomActions.ZoomOut));
Zoom = 100;
}
#endregion
#region Utility methods
/// <summary>
/// Determines whether the specified point is located within the image view port
/// </summary>
/// <param name="point">The point.</param>
/// <returns>
/// <c>true</c> if the specified point is located within the image view port; otherwise, <c>false</c>.
/// </returns>
public bool IsPointInImage(Point point)
=> GetImageViewPort().Contains(point);
/// <summary>
/// Determines whether the specified point is located within the image view port
/// </summary>
/// <param name="x">The X co-ordinate of the point to check.</param>
/// <param name="y">The Y co-ordinate of the point to check.</param>
/// <returns>
/// <c>true</c> if the specified point is located within the image view port; otherwise, <c>false</c>.
/// </returns>
public bool IsPointInImage(int x, int y)
=> IsPointInImage(new Point(x, y));
/// <summary>
/// Determines whether the specified point is located within the image view port
/// </summary>
/// <param name="x">The X co-ordinate of the point to check.</param>
/// <param name="y">The Y co-ordinate of the point to check.</param>
/// <returns>
/// <c>true</c> if the specified point is located within the image view port; otherwise, <c>false</c>.
/// </returns>
public bool IsPointInImage(double x, double y)
=> IsPointInImage(new Point(x, y));
/// <summary>
/// Converts the given client size point to represent a coordinate on the source image.
/// </summary>
/// <param name="x">The X co-ordinate of the point to convert.</param>
/// <param name="y">The Y co-ordinate of the point to convert.</param>
/// <param name="fitToBounds">
/// if set to <c>true</c> and the point is outside the bounds of the source image, it will be mapped to the nearest edge.
/// </param>
/// <returns><c>Point.Empty</c> if the point could not be matched to the source image, otherwise the new translated point</returns>
public Point PointToImage(double x, double y, bool fitToBounds = true)
=> PointToImage(new Point(x, y), fitToBounds);
/// <summary>
/// Converts the given client size point to represent a coordinate on the source image.
/// </summary>
/// <param name="x">The X co-ordinate of the point to convert.</param>
/// <param name="y">The Y co-ordinate of the point to convert.</param>
/// <param name="fitToBounds">
/// if set to <c>true</c> and the point is outside the bounds of the source image, it will be mapped to the nearest edge.
/// </param>
/// <returns><c>Point.Empty</c> if the point could not be matched to the source image, otherwise the new translated point</returns>
public Point PointToImage(int x, int y, bool fitToBounds = true)
{
return PointToImage(new Point(x, y), fitToBounds);
}
/// <summary>
/// Converts the given client size point to represent a coordinate on the source image.
/// </summary>
/// <param name="point">The source point.</param>
/// <param name="fitToBounds">
/// if set to <c>true</c> and the point is outside the bounds of the source image, it will be mapped to the nearest edge.
/// </param>
/// <returns><c>Point.Empty</c> if the point could not be matched to the source image, otherwise the new translated point</returns>
public Point PointToImage(Point point, bool fitToBounds = true)
{
double x;
double y;
var viewport = GetImageViewPort();
if (!fitToBounds || viewport.Contains(point))
{
x = (point.X + Offset.X - viewport.X) / ZoomFactor;
y = (point.Y + Offset.Y - viewport.Y) / ZoomFactor;
var image = Image;
if (fitToBounds)
{
x = Math.Clamp(x, 0, image.Size.Width-1);
y = Math.Clamp(y, 0, image.Size.Height-1);
}
}
else
{
x = 0; // Return Point.Empty if we couldn't match
y = 0;
}
return new(x, y);
}
/// <summary>
/// Returns the source <see cref="T:System.Drawing.Point" /> repositioned to include the current image offset and scaled by the current zoom level
/// </summary>
/// <param name="source">The source <see cref="Point"/> to offset.</param>
/// <returns>A <see cref="Point"/> which has been repositioned to match the current zoom level and image offset</returns>
public Point GetOffsetPoint(System.Drawing.Point source)
{
var offset = GetOffsetPoint(new Point(source.X, source.Y));
return new((int)offset.X, (int)offset.Y);
}
/// <summary>
/// Returns the source co-ordinates repositioned to include the current image offset and scaled by the current zoom level
/// </summary>
/// <param name="x">The source X co-ordinate.</param>
/// <param name="y">The source Y co-ordinate.</param>
/// <returns>A <see cref="Point"/> which has been repositioned to match the current zoom level and image offset</returns>
public Point GetOffsetPoint(int x, int y)
{
return GetOffsetPoint(new System.Drawing.Point(x, y));
}
/// <summary>
/// Returns the source co-ordinates repositioned to include the current image offset and scaled by the current zoom level
/// </summary>
/// <param name="x">The source X co-ordinate.</param>
/// <param name="y">The source Y co-ordinate.</param>
/// <returns>A <see cref="Point"/> which has been repositioned to match the current zoom level and image offset</returns>
public Point GetOffsetPoint(double x, double y)
{
return GetOffsetPoint(new Point(x, y));
}
/// <summary>
/// Returns the source <see cref="T:System.Drawing.PointF" /> repositioned to include the current image offset and scaled by the current zoom level
/// </summary>
/// <param name="source">The source <see cref="PointF"/> to offset.</param>
/// <returns>A <see cref="PointF"/> which has been repositioned to match the current zoom level and image offset</returns>
public Point GetOffsetPoint(Point source)
{
Rect viewport = GetImageViewPort();
var scaled = GetScaledPoint(source);
var offsetX = viewport.Left + Offset.X;
var offsetY = viewport.Top + Offset.Y;
return new(scaled.X + offsetX, scaled.Y + offsetY);
}
/// <summary>
/// Returns the source <see cref="T:System.Drawing.RectangleF" /> scaled according to the current zoom level and repositioned to include the current image offset
/// </summary>
/// <param name="source">The source <see cref="RectangleF"/> to offset.</param>
/// <returns>A <see cref="RectangleF"/> which has been resized and repositioned to match the current zoom level and image offset</returns>
public Rect GetOffsetRectangle(Rect source)
{
var viewport = GetImageViewPort();
var scaled = GetScaledRectangle(source);
var offsetX = viewport.Left - Offset.X;
var offsetY = viewport.Top - Offset.Y;
return new(new Point(scaled.Left + offsetX, scaled.Top + offsetY), scaled.Size);
}
/// <summary>
/// Returns the source rectangle scaled according to the current zoom level and repositioned to include the current image offset
/// </summary>
/// <param name="x">The X co-ordinate of the source rectangle.</param>
/// <param name="y">The Y co-ordinate of the source rectangle.</param>
/// <param name="width">The width of the rectangle.</param>
/// <param name="height">The height of the rectangle.</param>
/// <returns>A <see cref="Rectangle"/> which has been resized and repositioned to match the current zoom level and image offset</returns>
public Rectangle GetOffsetRectangle(int x, int y, int width, int height)
{
return GetOffsetRectangle(new Rectangle(x, y, width, height));
}
/// <summary>
/// Returns the source rectangle scaled according to the current zoom level and repositioned to include the current image offset
/// </summary>
/// <param name="x">The X co-ordinate of the source rectangle.</param>
/// <param name="y">The Y co-ordinate of the source rectangle.</param>
/// <param name="width">The width of the rectangle.</param>
/// <param name="height">The height of the rectangle.</param>
/// <returns>A <see cref="RectangleF"/> which has been resized and repositioned to match the current zoom level and image offset</returns>
public Rect GetOffsetRectangle(double x, double y, double width, double height)
{
return GetOffsetRectangle(new Rect(x, y, width, height));
}
/// <summary>
/// Returns the source <see cref="T:System.Drawing.Rectangle" /> scaled according to the current zoom level and repositioned to include the current image offset
/// </summary>
/// <param name="source">The source <see cref="Rectangle"/> to offset.</param>
/// <returns>A <see cref="Rectangle"/> which has been resized and repositioned to match the current zoom level and image offset</returns>
public Rectangle GetOffsetRectangle(Rectangle source)
{
var viewport = GetImageViewPort();
var scaled = GetScaledRectangle(source);
var offsetX = viewport.Left + Offset.X;
var offsetY = viewport.Top + Offset.Y;
return new(new System.Drawing.Point((int)(scaled.Left + offsetX), (int)(scaled.Top + offsetY)), new System.Drawing.Size((int)scaled.Size.Width, (int)scaled.Size.Height));
}
/// <summary>
/// Fits a given <see cref="T:System.Drawing.Rectangle" /> to match image boundaries
/// </summary>
/// <param name="rectangle">The rectangle.</param>
/// <returns>
/// A <see cref="T:System.Drawing.Rectangle" /> structure remapped to fit the image boundaries
/// </returns>
public Rectangle FitRectangle(Rectangle rectangle)
{
var image = Image;
if (image is null) return Rectangle.Empty;
var x = rectangle.X;
var y = rectangle.Y;
var w = rectangle.Width;
var h = rectangle.Height;
if (x < 0)
{
x = 0;
}
if (y < 0)
{
y = 0;
}
if (x + w > image.Size.Width)
{
w = (int)(image.Size.Width - x);
}
if (y + h > image.Size.Height)
{
h = (int)(image.Size.Height - y);
}
return new(x, y, w, h);
}
/// <summary>
/// Fits a given <see cref="T:System.Drawing.RectangleF" /> to match image boundaries
/// </summary>
/// <param name="rectangle">The rectangle.</param>
/// <returns>
/// A <see cref="T:System.Drawing.RectangleF" /> structure remapped to fit the image boundaries
/// </returns>
public Rect FitRectangle(Rect rectangle)
{
var image = Image;
if (image is null) return Rect.Empty;
var x = rectangle.X;
var y = rectangle.Y;
var w = rectangle.Width;
var h = rectangle.Height;
if (x < 0)
{
w -= -x;
x = 0;
}
if (y < 0)
{
h -= -y;
y = 0;
}
if (x + w > image.Size.Width)
{
w = image.Size.Width - x;
}
if (y + h > image.Size.Height)
{
h = image.Size.Height - y;
}
return new(x, y, w, h);
}
#endregion
#region Navigate / Scroll methods
/// <summary>
/// Scrolls the control to the given point in the image, offset at the specified display point
/// </summary>
/// <param name="x">The X co-ordinate of the point to scroll to.</param>
/// <param name="y">The Y co-ordinate of the point to scroll to.</param>
/// <param name="relativeX">The X co-ordinate relative to the <c>x</c> parameter.</param>
/// <param name="relativeY">The Y co-ordinate relative to the <c>y</c> parameter.</param>
public void ScrollTo(double x, double y, double relativeX, double relativeY)
=> ScrollTo(new Point(x, y), new Point(relativeX, relativeY));
/// <summary>
/// Scrolls the control to the given point in the image, offset at the specified display point
/// </summary>
/// <param name="x">The X co-ordinate of the point to scroll to.</param>
/// <param name="y">The Y co-ordinate of the point to scroll to.</param>
/// <param name="relativeX">The X co-ordinate relative to the <c>x</c> parameter.</param>
/// <param name="relativeY">The Y co-ordinate relative to the <c>y</c> parameter.</param>
public void ScrollTo(int x, int y, int relativeX, int relativeY)
=> ScrollTo(new Point(x, y), new Point(relativeX, relativeY));
/// <summary>
/// Scrolls the control to the given point in the image, offset at the specified display point
/// </summary>
/// <param name="imageLocation">The point of the image to attempt to scroll to.</param>
/// <param name="relativeDisplayPoint">The relative display point to offset scrolling by.</param>
public void ScrollTo(Point imageLocation, Point relativeDisplayPoint)
{
//CanRender = false;
var zoomFactor = ZoomFactor;
var x = imageLocation.X * zoomFactor - relativeDisplayPoint.X;
var y = imageLocation.Y * zoomFactor - relativeDisplayPoint.Y;
_canRender = true;
Offset = new Vector(x, y);
/*Debug.WriteLine(
$"X/Y: {x},{y} | \n" +
$"Offset: {Offset} | \n" +
$"ZoomFactor: {ZoomFactor} | \n" +
$"Image Location: {imageLocation}\n" +
$"MAX: {HorizontalScrollBar.Maximum},{VerticalScrollBar.Maximum} \n" +
$"ViewPort: {Viewport.Width},{Viewport.Height} \n" +
$"Container: {HorizontalScrollBar.ViewportSize},{VerticalScrollBar.ViewportSize} \n" +
$"Relative: {relativeDisplayPoint}");*/
}
/// <summary>
/// Centers the given point in the image in the center of the control
/// </summary>
/// <param name="imageLocation">The point of the image to attempt to center.</param>
public void CenterAt(System.Drawing.Point imageLocation)
=> ScrollTo(new Point(imageLocation.X, imageLocation.Y), new Point(ViewPortSize.Width / 2, ViewPortSize.Height / 2));
/// <summary>
/// Centers the given point in the image in the center of the control
/// </summary>
/// <param name="imageLocation">The point of the image to attempt to center.</param>
public void CenterAt(Point imageLocation)
=> ScrollTo(imageLocation, new Point(ViewPortSize.Width / 2, ViewPortSize.Height / 2));
/// <summary>
/// Centers the given point in the image in the center of the control
/// </summary>
/// <param name="x">The X co-ordinate of the point to center.</param>
/// <param name="y">The Y co-ordinate of the point to center.</param>
public void CenterAt(int x, int y)
=> CenterAt(new Point(x, y));
/// <summary>
/// Centers the given point in the image in the center of the control
/// </summary>
/// <param name="x">The X co-ordinate of the point to center.</param>
/// <param name="y">The Y co-ordinate of the point to center.</param>
public void CenterAt(double x, double y)
=> CenterAt(new Point(x, y));
/// <summary>
/// Resets the viewport to show the center of the image.
/// </summary>
public void CenterToImage()
{
Offset = new Vector(HorizontalScrollBar.Maximum / 2, VerticalScrollBar.Maximum / 2);
}
#endregion
#region Selection / ROI methods
/// <summary>
/// Returns the source <see cref="T:System.Drawing.Point" /> scaled according to the current zoom level
/// </summary>
/// <param name="x">The X co-ordinate of the point to scale.</param>
/// <param name="y">The Y co-ordinate of the point to scale.</param>
/// <returns>A <see cref="Point"/> which has been scaled to match the current zoom level</returns>
public Point GetScaledPoint(int x, int y)
{
return GetScaledPoint(new Point(x, y));
}
/// <summary>
/// Returns the source <see cref="T:System.Drawing.Point" /> scaled according to the current zoom level
/// </summary>
/// <param name="x">The X co-ordinate of the point to scale.</param>
/// <param name="y">The Y co-ordinate of the point to scale.</param>
/// <returns>A <see cref="Point"/> which has been scaled to match the current zoom level</returns>
public PointF GetScaledPoint(float x, float y)
{
return GetScaledPoint(new PointF(x, y));
}
/// <summary>
/// Returns the source <see cref="T:System.Drawing.Point" /> scaled according to the current zoom level
/// </summary>
/// <param name="source">The source <see cref="Point"/> to scale.</param>
/// <returns>A <see cref="Point"/> which has been scaled to match the current zoom level</returns>
public Point GetScaledPoint(Point source)
{
return new(source.X * ZoomFactor, source.Y * ZoomFactor);
}
/// <summary>
/// Returns the source <see cref="T:System.Drawing.PointF" /> scaled according to the current zoom level
/// </summary>
/// <param name="source">The source <see cref="PointF"/> to scale.</param>
/// <returns>A <see cref="PointF"/> which has been scaled to match the current zoom level</returns>
public PointF GetScaledPoint(PointF source)
{
return new((float)(source.X * ZoomFactor), (float)(source.Y * ZoomFactor));
}
/// <summary>
/// Returns the source rectangle scaled according to the current zoom level
/// </summary>
/// <param name="x">The X co-ordinate of the source rectangle.</param>
/// <param name="y">The Y co-ordinate of the source rectangle.</param>
/// <param name="width">The width of the rectangle.</param>
/// <param name="height">The height of the rectangle.</param>
/// <returns>A <see cref="Rectangle"/> which has been scaled to match the current zoom level</returns>
public Rect GetScaledRectangle(int x, int y, int width, int height)
{
return GetScaledRectangle(new Rect(x, y, width, height));
}
/// <summary>
/// Returns the source rectangle scaled according to the current zoom level
/// </summary>
/// <param name="x">The X co-ordinate of the source rectangle.</param>
/// <param name="y">The Y co-ordinate of the source rectangle.</param>
/// <param name="width">The width of the rectangle.</param>
/// <param name="height">The height of the rectangle.</param>
/// <returns>A <see cref="RectangleF"/> which has been scaled to match the current zoom level</returns>
public RectangleF GetScaledRectangle(float x, float y, float width, float height)
{
return GetScaledRectangle(new RectangleF(x, y, width, height));
}
/// <summary>
/// Returns the source rectangle scaled according to the current zoom level
/// </summary>
/// <param name="location">The location of the source rectangle.</param>
/// <param name="size">The size of the source rectangle.</param>
/// <returns>A <see cref="Rectangle"/> which has been scaled to match the current zoom level</returns>
public Rect GetScaledRectangle(Point location, Size size)
{
return GetScaledRectangle(new Rect(location, size));
}
/// <summary>
/// Returns the source rectangle scaled according to the current zoom level
/// </summary>
/// <param name="location">The location of the source rectangle.</param>
/// <param name="size">The size of the source rectangle.</param>
/// <returns>A <see cref="Rectangle"/> which has been scaled to match the current zoom level</returns>
public RectangleF GetScaledRectangle(PointF location, SizeF size)
{
return GetScaledRectangle(new RectangleF(location, size));
}
/// <summary>
/// Returns the source <see cref="T:System.Drawing.Rectangle" /> scaled according to the current zoom level
/// </summary>
/// <param name="source">The source <see cref="Rectangle"/> to scale.</param>
/// <returns>A <see cref="Rectangle"/> which has been scaled to match the current zoom level</returns>
public Rect GetScaledRectangle(Rect source)
{
return new(source.Left * ZoomFactor, source.Top * ZoomFactor, source.Width * ZoomFactor, source.Height * ZoomFactor);
}
/// <summary>
/// Returns the source <see cref="T:System.Drawing.RectangleF" /> scaled according to the current zoom level
/// </summary>
/// <param name="source">The source <see cref="RectangleF"/> to scale.</param>
/// <returns>A <see cref="RectangleF"/> which has been scaled to match the current zoom level</returns>
public RectangleF GetScaledRectangle(RectangleF source)
{
return new((float)(source.Left * ZoomFactor), (float)(source.Top * ZoomFactor), (float)(source.Width * ZoomFactor), (float)(source.Height * ZoomFactor));
}
/// <summary>
/// Returns the source size scaled according to the current zoom level
/// </summary>
/// <param name="width">The width of the size to scale.</param>
/// <param name="height">The height of the size to scale.</param>
/// <returns>A <see cref="SizeF"/> which has been resized to match the current zoom level</returns>
public SizeF GetScaledSize(float width, float height)
{
return GetScaledSize(new SizeF(width, height));
}
/// <summary>
/// Returns the source size scaled according to the current zoom level
/// </summary>
/// <param name="width">The width of the size to scale.</param>
/// <param name="height">The height of the size to scale.</param>
/// <returns>A <see cref="Size"/> which has been resized to match the current zoom level</returns>
public Size GetScaledSize(int width, int height)
{
return GetScaledSize(new Size(width, height));
}
/// <summary>
/// Returns the source <see cref="T:System.Drawing.SizeF" /> scaled according to the current zoom level
/// </summary>
/// <param name="source">The source <see cref="SizeF"/> to scale.</param>
/// <returns>A <see cref="SizeF"/> which has been resized to match the current zoom level</returns>
public SizeF GetScaledSize(SizeF source)
{
return new((float)(source.Width * ZoomFactor), (float)(source.Height * ZoomFactor));
}
/// <summary>
/// Returns the source <see cref="T:System.Drawing.Size" /> scaled according to the current zoom level
/// </summary>
/// <param name="source">The source <see cref="Size"/> to scale.</param>
/// <returns>A <see cref="Size"/> which has been resized to match the current zoom level</returns>
public Size GetScaledSize(Size source)
{
return new(source.Width * ZoomFactor, source.Height * ZoomFactor);
}
/// <summary>
/// Creates a selection region which encompasses the entire image
/// </summary>
/// <exception cref="System.InvalidOperationException">Thrown if no image is currently set</exception>
public void SelectAll()
{
var image = Image;
if (image is null) return;
SelectionRegion = new Rect(0, 0, image.Size.Width, image.Size.Height);
}
/// <summary>
/// Clears any existing selection region
/// </summary>
public void SelectNone()
{
SelectionRegion = Rect.Empty;
}
#endregion
#region Viewport and image region methods
/// <summary>
/// Gets the source image region.
/// </summary>
/// <returns></returns>
public Rect GetSourceImageRegion()
{
var image = Image;
if (image is null) return Rect.Empty;
switch (SizeMode)
{
case SizeModes.Normal:
var offset = Offset;
var viewPort = GetImageViewPort();
var zoomFactor = ZoomFactor;
double sourceLeft = (offset.X / zoomFactor);
double sourceTop = (offset.Y / zoomFactor);
double sourceWidth = (viewPort.Width / zoomFactor);
double sourceHeight = (viewPort.Height / zoomFactor);
return new(sourceLeft, sourceTop, sourceWidth, sourceHeight);
}
return new(0, 0, image.Size.Width, image.Size.Height);
}
/// <summary>
/// Gets the image view port.
/// </summary>
/// <returns></returns>
public Rect GetImageViewPort()
{
if (!IsImageLoaded || (ViewPortSize.Width == 0 && ViewPortSize.Height == 0)) return Rect.Empty;
double xOffset = 0;
double yOffset = 0;
double width = 0;
double height = 0;
switch (SizeMode)
{
case SizeModes.Normal:
if (AutoCenter)
{
xOffset = (!IsHorizontalBarVisible ? (ViewPortSize.Width - ScaledImageWidth) / 2 : 0);
yOffset = (!IsVerticalBarVisible ? (ViewPortSize.Height - ScaledImageHeight) / 2 : 0);
}
width = Math.Min(ScaledImageWidth - Math.Abs(Offset.X), ViewPortSize.Width);
height = Math.Min(ScaledImageHeight - Math.Abs(Offset.Y), ViewPortSize.Height);
break;
case SizeModes.Stretch:
width = ViewPortSize.Width;
height = ViewPortSize.Height;
break;
case SizeModes.Fit:
var image = Image;
double scaleFactor = Math.Min(ViewPortSize.Width / image.Size.Width, ViewPortSize.Height / image.Size.Height);
width = Math.Floor(image.Size.Width * scaleFactor);
height = Math.Floor(image.Size.Height * scaleFactor);
if (AutoCenter)
{
xOffset = (ViewPortSize.Width - width) / 2;
yOffset = (ViewPortSize.Height - height) / 2;
}
break;
default:
throw new ArgumentOutOfRangeException(nameof(SizeMode), SizeMode, null);
}
return new(xOffset, yOffset, width, height);
}
#endregion
#region Image methods
public void LoadImage(string path)
{
Image = new Bitmap(path);
}
public Bitmap GetSelectedBitmap()
{
var image = ImageAsWriteableBitmap;
if (image is null || !HaveSelection) return null;
var selection = SelectionRegionNet;
var pixelSize = SelectionPixelSize;
using var frameBuffer = image.Lock();
var newBitmap = new WriteableBitmap(pixelSize, image.Dpi, frameBuffer.Format, AlphaFormat.Unpremul);
using var newFrameBuffer = newBitmap.Lock();
int i = 0;
unsafe
{
var inputPixels = (uint*) (void*) frameBuffer.Address;
var targetPixels = (uint*) (void*) newFrameBuffer.Address;
for (int y = selection.Y; y < selection.Bottom; y++)
{
var thisY = y * frameBuffer.Size.Width;
for (int x = selection.X; x < selection.Right; x++)
{
targetPixels[i++] = inputPixels[thisY + x];
}
}
}
return newBitmap;
}
#endregion
}
}
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