public CanvasEvent(final ImageCanvas canvas) {
super(canvas.getDisplay());
this.canvas = canvas;
}
/** Gets the coordinates in <em>data</em> space for the given (x, y) pixel coordinates. */
private RealCoords getDataCoords(final Display<?> d, final int x, final int y) {
if (!(d instanceof ImageDisplay)) return null;
final ImageDisplay imageDisplay = (ImageDisplay) d;
final ImageCanvas canvas = imageDisplay.getCanvas();
return canvas.panelToDataCoords(new IntCoords(x, y));
}