//Pushes a viewport to limit the drawing space to the given bounds within the current drawing space.
func (me *Canvas) PushViewport(x, y, width, height int) {
me.origin.SubtractFrom(me.viewport.translate())
me.viewport.push(starfish.Bounds{starfish.Point{X: int(x), Y: int(y)}, starfish.Size{Width: int(width), Height: int(height)}})
r := me.viewport.bounds()
p.SetClipRect(r.X, r.Y, r.Width, r.Height)
me.origin = me.translation.AddOf(me.viewport.bounds().Point)
me.origin.AddTo(me.viewport.translate())
}
//Exits the current viewport, unless there is no viewport.
func (me *Canvas) PopViewport() {
if me.viewport.pt != 0 {
me.origin.SubtractFrom(me.viewport.translate())
me.viewport.pop()
r := me.viewport.bounds()
if r.Width == -1 {
r.Width = p.DisplayWidth()
}
if r.Height == -1 {
r.Height = p.DisplayHeight()
}
p.SetClipRect(r.X, r.Y, r.Width, r.Height)
me.origin = me.translation.AddOf(me.viewport.bounds().Point)
me.origin.AddTo(me.viewport.translate())
}
}
//Loads the settings for this Pane onto the SDL Surface.
func (me *Canvas) load() {
me.viewport.calcBounds()
r := me.viewport.bounds()
p.SetClipRect(r.X, r.Y, r.Width, r.Height)
}