Method draw

src/test/GrayscalePlotTest.java:23–27

(DrawingPanel panel, Graphics g)

	ArrayData griddata = new ArrayData(numpts, numpts, 3);
	GrayscalePlot grayscalePlot = new GrayscalePlot(griddata) {
		@Override
		public void draw(DrawingPanel panel, Graphics g) {
			setRandomVals();
			super.draw(panel, g);
		}
	};
	PlottingPanel plottingPanel = new PlottingPanel("x", "t", null);
	DrawingFrame drawingFrame = new DrawingFrame(plottingPanel);