Class ContrastPlot

ij/src/main/java/ij/plugin/frame/ContrastAdjuster.java:1314–1485

class ContrastPlot extends Canvas implements MouseListener {
	Color[] hColors;
	static final int WIDTH=128, HEIGHT=64;
	double defaultMin = 0;
	double defaultMax = 255;
	double min = 0;
	double max = 255;
	int[] histogram;
	int hmax;
	Image os;
	Graphics osg;
	Color color = Color.gray;
	double scale = Prefs.getGuiScale();
	int width = WIDTH;
	int height = HEIGHT;

	public ContrastPlot() {
		addMouseListener(this);
		width = (int)(width*1.3); // increase size
		height = (int)(height*1.3); // increase size
		if (scale>1.0) {
			width = (int)(width*scale);
			height = (int)(height*scale);
		}
		setSize(width+1, height+1);
	}

    /** Overrides Component getPreferredSize(). Added to work
    	around a bug in Java 1.4.1 on Mac OS X.*/
    public Dimension getPreferredSize() {
        return new Dimension(width+1, height+1);
    }

	void setHistogram(ImageStatistics stats, boolean isLogHist) {
		histogram = stats.histogram;
		if (isLogHist) {
			for (int j=0;j<256;j++) {
				histogram[j]=(int)(Math.log(histogram[j])*100);
			}
		}
		ImagePlus imp = WindowManager.getCurrentImage();
		hColors = new Color[256];
		for (int i=0; i<256; i++) { // set the default histogram color when there is no LUT
			hColors[i] = new Color(110, 110,150);
		}
		int impType= imp.getType();
		if ((impType == ImagePlus.GRAY8) || (impType == ImagePlus.GRAY16) || (impType == ImagePlus.GRAY32)) { //if image has LUT
			ImageProcessor ip = imp.getProcessor();
			ColorModel cm = ip.getColorModel();
			IndexColorModel icm = (IndexColorModel)cm;
			int mapSize = icm.getMapSize();
			if (mapSize!=256)
				return;
			byte[] red = new byte[256];
			byte[] green = new byte[256];
			byte[] blue = new byte[256];
			icm.getReds(red);
			icm.getGreens(green);