From 80c14a2adc06c92620471b226a64a3540718dd71 Mon Sep 17 00:00:00 2001
From: Pullusb <bernou.samuel@gmail.com>
Date: Mon, 14 Mar 2022 22:53:28 +0100
Subject: GPencil Tools: Added mirror flip

New button in menu to flip view horizontally within camera by inverting x-scale
---
 greasepencil_tools/__init__.py   |  5 ++++-
 greasepencil_tools/draw_tools.py | 23 +++++++++++++++++++++++
 greasepencil_tools/ui_panels.py  | 15 ++++++++++++---
 3 files changed, 39 insertions(+), 4 deletions(-)
 create mode 100644 greasepencil_tools/draw_tools.py

diff --git a/greasepencil_tools/__init__.py b/greasepencil_tools/__init__.py
index 0205362b..980493ed 100644
--- a/greasepencil_tools/__init__.py
+++ b/greasepencil_tools/__init__.py
@@ -4,7 +4,7 @@ bl_info = {
 "name": "Grease Pencil Tools",
 "description": "Extra tools for Grease Pencil",
 "author": "Samuel Bernou, Antonio Vazquez, Daniel Martinez Lara, Matias Mendiola",
-"version": (1, 5, 7),
+"version": (1, 6, 0),
 "blender": (2, 91, 0),
 "location": "Sidebar > Grease Pencil > Grease Pencil Tools",
 "warning": "",
@@ -20,6 +20,7 @@ from .  import (prefs,
                 line_reshape,
                 rotate_canvas,
                 timeline_scrub,
+                draw_tools,
                 import_brush_pack,
                 ui_panels,
                 )
@@ -32,6 +33,7 @@ def register():
     box_deform.register()
     line_reshape.register()
     rotate_canvas.register()
+    draw_tools.register()
     import_brush_pack.register()
     ui_panels.register()
 
@@ -43,6 +45,7 @@ def unregister():
         return
     ui_panels.unregister()
     import_brush_pack.unregister()
+    draw_tools.unregister()
     rotate_canvas.unregister()
     box_deform.unregister()
     line_reshape.unregister()
diff --git a/greasepencil_tools/draw_tools.py b/greasepencil_tools/draw_tools.py
new file mode 100644
index 00000000..6d2cf3a9
--- /dev/null
+++ b/greasepencil_tools/draw_tools.py
@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+import bpy
+
+class GP_OT_camera_flip_x(bpy.types.Operator):
+    bl_idname = "gp.camera_flip_x"
+    bl_label = "Camera Flip X"
+    bl_description = "Invert active camera scale.x to flip view horizontally"
+    bl_options = {"REGISTER"}
+
+    @classmethod
+    def poll(cls, context):
+        return context.space_data.region_3d.view_perspective == 'CAMERA'
+
+    def execute(self, context):
+        context.scene.camera.scale.x *= -1
+        return {"FINISHED"}
+
+def register():
+    bpy.utils.register_class(GP_OT_camera_flip_x)
+
+def unregister():
+    bpy.utils.unregister_class(GP_OT_camera_flip_x)
diff --git a/greasepencil_tools/ui_panels.py b/greasepencil_tools/ui_panels.py
index ff3900de..2e8a50f1 100644
--- a/greasepencil_tools/ui_panels.py
+++ b/greasepencil_tools/ui_panels.py
@@ -20,15 +20,24 @@ class GP_PT_sidebarPanel(bpy.types.Panel):
         layout.operator('gp.straight_stroke', icon ="CURVE_PATH")# IPO_LINEAR
 
 
-        # Expose Native view operators
-        # if context.scene.camera:
+        # Expose native view operators
         row = layout.row(align=True)
-        row.operator('view3d.zoom_camera_1_to_1', text = 'Zoom 1:1', icon = 'ZOOM_PREVIOUS')# FULLSCREEN_EXIT?
+        row.operator('view3d.zoom_camera_1_to_1', text = 'Zoom 1:1', icon = 'ZOOM_PREVIOUS') # FULLSCREEN_EXIT
         row.operator('view3d.view_center_camera', text = 'Zoom Fit', icon = 'FULLSCREEN_ENTER')
+
+        # Rotation save/load
         row = layout.row(align=True)
         row.operator('view3d.rotate_canvas_reset', text = 'Reset Rotation', icon = 'FILE_REFRESH')
         row.operator('view3d.rotate_canvas_set', text = 'Save Rotation', icon = 'DRIVER_ROTATIONAL_DIFFERENCE')
 
+        # View flip
+        if context.scene.camera and context.scene.camera.scale.x < 0:
+            row = layout.row(align=True)
+            row.operator('gp.camera_flip_x', text = 'Camera Mirror Flip', icon = 'MOD_MIRROR')
+            row.label(text='', icon='LOOP_BACK')
+        else:
+            layout.operator('gp.camera_flip_x', text = 'Camera Mirror Flip', icon = 'MOD_MIRROR')
+
 
 def menu_boxdeform_entry(self, context):
     """Transform shortcut to append in existing menu"""
-- 
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