Added support for getting & setting location of Renderer.

allg5ui/renderer.go

@@ -288,8 +288,7 @@ func (r *Renderer) Line(p, q geom.PointF32, color color.Color, thickness float32
 }
 
 func (r *Renderer) Location() geom.Point {
-	x, y := r.disp.Position()
-	return geom.Pt(x, y)
+	return geom.Pt(r.disp.Position()...)
 }
 
 func (r *Renderer) Move(to geom.Point) {