80 lines
2.3 KiB
Python
80 lines
2.3 KiB
Python
import bpy
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import bgl
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import blf
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import gpu
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from gpu_extras.batch import batch_for_shader
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def draw_callback_px(self, context):
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print("mouse points", len(self.mouse_path))
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font_id = 0 # XXX, need to find out how best to get this.
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# draw some text
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blf.position(font_id, 15, 30, 0)
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blf.size(font_id, 20, 72)
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blf.draw(font_id, "Hello Word " + str(len(self.mouse_path)))
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# 50% alpha, 2 pixel width line
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shader = gpu.shader.from_builtin('2D_UNIFORM_COLOR')
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bgl.glEnable(bgl.GL_BLEND)
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bgl.glLineWidth(2)
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batch = batch_for_shader(shader, 'LINE_STRIP', {"pos": self.mouse_path})
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shader.bind()
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shader.uniform_float("color", (0.0, 0.0, 0.0, 0.5))
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batch.draw(shader)
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# restore opengl defaults
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bgl.glLineWidth(1)
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bgl.glDisable(bgl.GL_BLEND)
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class ModalDrawOperator(bpy.types.Operator):
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"""Draw a line with the mouse"""
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bl_idname = "view3d.modal_operator"
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bl_label = "Simple Modal View3D Operator"
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def modal(self, context, event):
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context.area.tag_redraw()
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if event.type == 'MOUSEMOVE':
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self.mouse_path.append((event.mouse_region_x, event.mouse_region_y))
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elif event.type == 'LEFTMOUSE':
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bpy.types.SpaceView3D.draw_handler_remove(self._handle, 'WINDOW')
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return {'FINISHED'}
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elif event.type in {'RIGHTMOUSE', 'ESC'}:
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bpy.types.SpaceView3D.draw_handler_remove(self._handle, 'WINDOW')
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return {'CANCELLED'}
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return {'RUNNING_MODAL'}
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def invoke(self, context, event):
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if context.area.type == 'VIEW_3D':
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# the arguments we pass the the callback
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args = (self, context)
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# Add the region OpenGL drawing callback
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# draw in view space with 'POST_VIEW' and 'PRE_VIEW'
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self._handle = bpy.types.SpaceView3D.draw_handler_add(draw_callback_px, args, 'WINDOW', 'POST_PIXEL')
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self.mouse_path = []
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context.window_manager.modal_handler_add(self)
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return {'RUNNING_MODAL'}
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else:
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self.report({'WARNING'}, "View3D not found, cannot run operator")
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return {'CANCELLED'}
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def register():
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bpy.utils.register_class(ModalDrawOperator)
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def unregister():
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bpy.utils.unregister_class(ModalDrawOperator)
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if __name__ == "__main__":
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register()
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