/**
* Draws directly onto the surface using {@link DirectShapeRenderer}.
*/
private void drawDirectly(Surface surface) {
DirectShapeRenderer shapeRenderer = new DirectShapeRenderer(surface);
shapeRenderer.beginPath()
.drawLineSegment(40, 20, 180, 20)
.drawQuadraticCurveTo(200, 20, 200, 40)
.drawLineTo(200, 180)
.drawQuadraticCurveTo(200, 200, 180, 200)
.drawLineTo(40, 200)