func (r rectImage) Bounds() image.Rectangle { return image.Rectangle(r) }
func (r rectImage) At(x, y int) color.Color {
if (image.Point{x, y}).In(image.Rectangle(r)) {
return color.Opaque
}
return color.Transparent
}
func (i *Image) Bounds() Rectangle {
return image.Rectangle(i.O_x, i.O_y, i.O_x+Wid, i.O_y+Hgt)
}