Introduction - If you have any usage issues, please Google them yourself
Write applications to polygon clipping, requires the following functions: 1, use the mouse to determine the crop area (rectangular area) 2 mouse input to be cut polygon (respectively, using the mouse left and right to determine the crop area to be cutting the polygon) crop, polygon drawing is completed, display the polygons after cutting, require the use of different colors to draw the crop area and crop polygon.