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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':
context.region.callback_remove(self._handle)
return {'FINISHED'}
elif event.type in {'RIGHTMOUSE', 'ESC'}:
context.region.callback_remove(self._handle)
return {'CANCELLED'}
return {'RUNNING_MODAL'}
def invoke(self, context, event):
if context.area.type == 'VIEW_3D':
context.window_manager.modal_handler_add(self)
# Add the region OpenGL drawing callback
# draw in view space with 'POST_VIEW' and 'PRE_VIEW'
self._handle = context.region.callback_add(draw_callback_px, (self, context), 'POST_PIXEL')
self.mouse_path = []
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()
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