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using System;
using System.Drawing;
using System.Collections;
namespace DrawingTestHelper
{
/// <summary>
/// Summary description for PDComparer.
/// </summary>
public class PDComparer
{
static int SearchRectSize = 10;
static double [,] ltDistances = new double[SearchRectSize,SearchRectSize];
static PDComparer()
{
for (int x = 0; x < SearchRectSize; x++)
for (int y = 0; y < SearchRectSize; y++)
{
ltDistances[x,y] = Math.Sqrt(x*x + y*y);
}
}
public PDComparer()
{
}
public static double Compare(Bitmap b1, Bitmap b2)
{
Point [] shapePoints = GetPointFromImage(b1);
double [] pointsDistance = new double[ shapePoints.Length ];
for (int i = 0; i < shapePoints.Length; i++)
{
pointsDistance[i] = DistanceToClosestPoint( shapePoints[i], b2 );
}
return Max( pointsDistance );
}
private static double DistanceToClosestPoint(Point p, Bitmap b)
{
if (IsPixelExist( b.GetPixel(p.X, p.Y) ))
return 0;
Rectangle r = new Rectangle(
p.X - SearchRectSize / 2,
p.Y - SearchRectSize / 2,
SearchRectSize,
SearchRectSize);
double min_distance = SearchRectSize;
for (int x = r.X; x < r.X + SearchRectSize; x++)
for (int y = r.Y; y < r.Y + SearchRectSize; y++)
if ((x < b.Width) && (y < b.Height) && (x >= 0) && (y >= 0))
{
if ( IsPixelExist( b.GetPixel(x, y) ) )
{
double d = CalculateDistance(p.X, p.Y, x, y);
if (d < min_distance)
min_distance = d;
}
}
return min_distance;
}
private static double CalculateDistance(Point a, Point b)
{
return CalculateDistance(a.X, a.Y, b.X, b.Y);
}
private static double CalculateDistance(int x1, int y1, int x2, int y2)
{
int delta_x = Math.Abs(x2 - x1);
int delta_y = Math.Abs(y2 - y1);
return ltDistances[delta_x, delta_y];
}
private static double Max(double [] a)
{
double max = 0;
for (int i = 0; i < a.Length; i++)
if (a[i] > max)
max = a[i];
return max;
}
private static Point [] GetPointFromImage(Bitmap b)
{
ArrayList points = new ArrayList();
for(int x = 0; x < b.Width; x++)
for(int y = 0; y < b.Height; y++)
if (IsPixelExist ( b.GetPixel(x, y) ))
points.Add( new Point(x, y) );
return (Point [])points.ToArray( typeof(Point) );
}
private static bool IsPixelExist(Color c)
{
return c.A > 0;
}
}
}
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