clipping-filling

clipping:Sutherland-Hodgeman filling: AET vertex sorting

for every drawing, you draw a polygon by clicking the mouse and end with clicking the starting point

clipping:

1. Click [convex polygon] draw a convex clipping polygon

2. Click [polygon] draw an arbitrary clipped polygon

3. After finishing the previous 2 steps, click [Sutherland-Hodgman], and the clipping parts will be drawn in black line

filling:

1. Click [polygon] draw an arbitrary clipped polygon

2. After finishing drawing the polygon, click [Vertex Sorting] to fill the polygon