1 files changed, 79 insertions, 0 deletions
diff --git a/release/scripts/templates_py/operator_modal_draw.py b/release/scripts/templates_py/operator_modal_draw.py
new file mode 100644
index 00000000000..d11ddf0b467
--- /dev/null
+++ b/release/scripts/templates_py/operator_modal_draw.py
@@ -0,0 +1,79 @@
+import bpy
+import bgl
+import blf
+
+
+def draw_callback_px(self, context):
+    print("mouse points", len(self.mouse_path))
+
+    font_id = 0  # XXX, need to find out how best to get this.
+
+    # draw some text
+    blf.position(font_id, 15, 30, 0)
+    blf.size(font_id, 20, 72)
+    blf.draw(font_id, "Hello Word " + str(len(self.mouse_path)))
+
+    # 50% alpha, 2 pixel width line
+    bgl.glEnable(bgl.GL_BLEND)
+    bgl.glColor4f(0.0, 0.0, 0.0, 0.5)
+    bgl.glLineWidth(2)
+
+    bgl.glBegin(bgl.GL_LINE_STRIP)
+    for x, y in self.mouse_path:
+        bgl.glVertex2i(x, y)
+
+    bgl.glEnd()
+
+    # restore opengl defaults
+    bgl.glLineWidth(1)
+    bgl.glDisable(bgl.GL_BLEND)
+    bgl.glColor4f(0.0, 0.0, 0.0, 1.0)
+
+
+class ModalDrawOperator(bpy.types.Operator):
+    """Draw a line with the mouse"""
+    bl_idname = "view3d.modal_operator"
+    bl_label = "Simple Modal View3D Operator"
+
+    def modal(self, context, event):
+        context.area.tag_redraw()
+
+        if event.type == 'MOUSEMOVE':
+            self.mouse_path.append((event.mouse_region_x, event.mouse_region_y))
+
+        elif event.type == 'LEFTMOUSE':
+            bpy.types.SpaceView3D.draw_handler_remove(self._handle, 'WINDOW')
+            return {'FINISHED'}
+
+        elif event.type in {'RIGHTMOUSE', 'ESC'}:
+            bpy.types.SpaceView3D.draw_handler_remove(self._handle, 'WINDOW')
+            return {'CANCELLED'}
+
+        return {'RUNNING_MODAL'}
+
+    def invoke(self, context, event):
+        if context.area.type == 'VIEW_3D':
+            # the arguments we pass the the callback
+            args = (self, context)
+            # Add the region OpenGL drawing callback
+            # draw in view space with 'POST_VIEW' and 'PRE_VIEW'
+            self._handle = bpy.types.SpaceView3D.draw_handler_add(draw_callback_px, args, 'WINDOW', 'POST_PIXEL')
+
+            self.mouse_path = []
+
+            context.window_manager.modal_handler_add(self)
+            return {'RUNNING_MODAL'}
+        else:
+            self.report({'WARNING'}, "View3D not found, cannot run operator")
+            return {'CANCELLED'}
+
+
+def register():
+    bpy.utils.register_class(ModalDrawOperator)
+
+
+def unregister():
+    bpy.utils.unregister_class(ModalDrawOperator)
+
+if __name__ == "__main__":
+    register()