Added support for getting & setting location of Renderer.

sdlui/renderer.go

@@ -375,12 +375,12 @@ func (r *Renderer) Line(p, q geom.PointF32, color color.Color, thickness float32
 }
 
 func (r *Renderer) Location() geom.Point {
-	x, y := r.renderer.GetPosition()
+	x, y := r.window.GetPosition()
 	return geom.Pt(int(x), int(y))
 }
 
 func (r *Renderer) Move(to geom.Point) {
-	r.renderer.SetPosition(int32(to.X), int32(to.Y))
+	r.window.SetPosition(int32(to.X), int32(to.Y))
 }
 
 func (r *Renderer) Rectangle(rect geom.RectangleF32, c color.Color, thickness float32) {