clipValues() examples: top, right, bottom, left
clipTo() examples:
clipTo left 20
clipTo right 80
clipTo top 20
clipTo bottom 80
clipTo (0,100,100,0)
clipTo (25,75,75,25)
clipBy() examples:
clip by (0,0,0,-10) more left
clip by (0,0,0,10) less left
clip by (0,10,0,0) more right
clip by (0,-10,0,0) less right
clip by (-10,0,0,0) more top
clip by (10,0,0,0) less top
clip by (0,0,0,-10) more bottom
clip by (0,0,0,10) less bottom