This work is a drawing board designed for mouse painters. The drawing board includes multiple functions.

① Line segments, circles, rectangles, polygons and other basic graphics rendering

② When drawing a straight line segment, it can be set as a continuous polyline, an independent line segment and a continuous and closed polyline

③ Preservation of drawing files

④ Rotational scaling of graphics for individual layers

⑤ Use the color ring for color selection

the use of cutting algorithm for cutting polygon drawing, can use the function of the polygon hollow operation

⑦ Editing of multiple layers, dragging of layers, merging of upper and lower layers, hiding and deleting of layers