var paint = Ypaint(canvas)
paint.chooseCircle()
圆形的粗细 paint.outerParams.circle.lineWidth
圆形的颜色 paint.outerParams.circle.color
paint.chooseRect()
矩形的粗细 paint.outerParams.rect.lineWidth
矩形的圆角 paint.outerParams.rect.radius
矩形的颜色 paint.outerParams.rect.color
paint.chooseArrow()
箭头的粗细 paint.outerParams.arrow.range
箭头的大小 paint.outerParams.arrow.color
paint.chooseCircle()
画笔的粗细 paint.outerParams.line.lineWidth
画笔的颜色 paint.outerParams.line.color