public void run() {
		if (!isActive() || !isRunning())
			return;
		int v = getCurrentVTile();
		int sy1 = v * tileSize.height;
		int sy2 = Math.min((v + 1) * tileSize.height, getSourceRectangle().height);
		
		int h = getCurrentHTile();
		int sx1 = h * tileSize.width;
		int sx2 = Math.min((h + 1) * tileSize.width, getSourceRectangle().width);
		org.eclipse.draw2d.geometry.Point p = getSourceRectangle().getLocation();

		Rectangle rect = new Rectangle(sx1 + p.x, sy1 + p.y, sx2 - sx1, sy2 - sy1);
		thumbnailGraphics.pushState();
		thumbnailGraphics.setClip(rect);
		thumbnailGraphics.fillRectangle(rect);
		sourceFigure.paint(thumbnailGraphics);
		thumbnailGraphics.popState();
		
		if (getCurrentHTile() < (hTiles - 1))
			setCurrentHTile(getCurrentHTile() + 1);
		else {
			setCurrentHTile(0);
			if (getCurrentVTile() < (vTiles - 1))
				setCurrentVTile(getCurrentVTile() + 1);
			else
				setCurrentVTile(0);
		}
		
		if (getCurrentHTile() != 0 || getCurrentVTile() != 0)
			Display.getCurrent().asyncExec(this);
		else if (isDirty()) {
			setDirty(false);
			Display.getCurrent().asyncExec(this);
			repaint();
		} else {
			stop();
			repaint();
		}
	}