Added support for getting & setting location of Renderer.

allg5ui/renderer.go

@@ -287,6 +287,15 @@ func (r *Renderer) Line(p, q geom.PointF32, color color.Color, thickness float32
 	allg5.DrawLine(p.X, p.Y, q.X, q.Y, newColor(color), thickness)
 }
 
+func (r *Renderer) Location() geom.Point {
+	x, y := r.disp.Position()
+	return geom.Pt(x, y)
+}
+
+func (r *Renderer) Move(to geom.Point) {
+	r.disp.SetPosition(to.X, to.Y)
+}
+
 func (r *Renderer) mustGetBitmap(t ui.Texture) *allg5.Bitmap {
 	texture, ok := t.(*texture)
 	if !ok {

sdlui/renderer.go

@@ -374,6 +374,15 @@ func (r *Renderer) Line(p, q geom.PointF32, color color.Color, thickness float32
 	r.renderer.DrawLineF(p.X, p.Y, q.X, q.Y)
 }
 
+func (r *Renderer) Location() geom.Point {
+	x, y := r.renderer.GetPosition()
+	return geom.Pt(int(x), int(y))
+}
+
+func (r *Renderer) Move(to geom.Point) {
+	r.renderer.SetPosition(int32(to.X), int32(to.Y))
+}
+
 func (r *Renderer) Rectangle(rect geom.RectangleF32, c color.Color, thickness float32) {
 	r.SetDrawColorGo(c)
 	if rect.Dx() == 0 { // SDL doesn't draw a 1 px wide line when Dx() == 0 && thickness == 1

ui/renderer.go

@@ -31,6 +31,8 @@ type Renderer interface {
 	DrawTexturePointOptions(t Texture, p geom.PointF32, opts DrawOptions)
 	FillRectangle(r geom.RectangleF32, c color.Color)
 	Line(p, q geom.PointF32, color color.Color, thickness float32)
+	Location() geom.Point
+	Move(geom.Point)
 	Rectangle(r geom.RectangleF32, c color.Color, thickness float32)
 	RenderTo(Texture)
 	RenderToDisplay()