protected int[] getCoordinates(GwtEvent<? extends EventHandler> event) {
if (event instanceof TouchEvent) {
return getPositionInTouch((TouchEvent<? extends EventHandler>) event);
} else if (event instanceof MouseEvent) {
MouseEvent<? extends EventHandler> me = (MouseEvent<? extends EventHandler>) event;
return new int[] {me.getRelativeX(canvas.getElement()), me.getRelativeY(canvas.getElement())};
}
return null;
}
private int[] getPositionInTouch(TouchEvent<? extends EventHandler> event) {
if (event instanceof TouchEndEvent) return new int[] {previousX, previousY};
JsArray<Touch> touches = event.getTouches();
if (touches == null || touches.length() == 0) return null;
// Get the first touch
Touch touch = touches.get(0);
int x = touch.getRelativeX(canvas.getElement());
int y = touch.getRelativeY(canvas.getElement());
return new int[] {x, y};
}