DistanceMeasure/BandPlot.java at master · tranquilinho/DistanceMeasure · GitHub

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import ij.measure.Measurements;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JComponent;

import jgc.slider.*;

/**
 * extracted from ImageJ (it's a private inner class...)
 * @see ij.gui.HistogramWindow, ij.plugin.frame.ColorThresholder
 *
 */
// No need to use all the space available for the bands (since the histograms
// are limited to 256 bars, and the panel width is 256. Maybe in the future...
class BandPlot extends JComponent implements Measurements, MouseListener {
	private static final long serialVersionUID = -2625959885566410861L;
	private static int LOWTHRESHOLD = 0, HIGHTHRESHOLD = 255;
	final int WIDTH = 256, HEIGHT = 64;

	private RangeSlider thresholds;

	private double minHue = 0, maxHue = 255;
	// minSat=0, minBri=0;
	// private double maxSat= 255, maxBri=255;

	private Image os = null;
	private Graphics osg;

	private ImageHistogram histogram;

	public void setHistogram(ImageHistogram histogram) {
		this.histogram = histogram;
		os = null;
	}

	public void setThresholds(RangeSlider t) {
		thresholds = t;
	}

	public int getLowThreshold() {
		if (thresholds != null)
			return thresholds.getValue();
		return LOWTHRESHOLD;
	}

	public int getHighThreshold() {
		if (thresholds != null)
			return thresholds.getUpperValue();
		return HIGHTHRESHOLD;
	}

	public BandPlot() {
		setBackground(Color.YELLOW);
		addMouseListener(this);
		// setSize(WIDTH+1, HEIGHT+1);
	}

	public void paintComponent(Graphics g) {
		super.paintChildren(g);
		int hHist = 0;
		if (histogram != null) {
			if (os == null) {
				os = createImage(getWidth(), getHeight());
				osg = os.getGraphics();
				osg.setColor(new Color(140, 152, 144));
				osg.fillRect(0, 0, getWidth(), getHeight());
				for (int i = 0; i < WIDTH; i++) {
					Color c = histogram.getColor(i);
					if (c != null)
						osg.setColor(c);
					hHist = getHeight()
							- ((int) (getHeight() * histogram.get(i)) / histogram
									.getMax()) - 6;
					osg.drawLine(i, getHeight(), i, hHist);
					osg.setColor(Color.black);
					osg.drawLine(i, hHist, i, hHist);
				}
				osg.dispose();
			}
			if (os != null)
				g.drawImage(os, 0, 0, this);
		} else {
			g.setColor(getBackground());
			g.fillRect(0, 0, getWidth(), getHeight());
		}
		g.setColor(Color.black);
		// g.drawLine(0, getHeight() -6, 256, getHeight()-6);
		g.drawRect(0, 0, getWidth(), getHeight());
		g.drawRect((int) minHue, 1, (int) (maxHue - minHue), getHeight() - 7);
		g.setColor(Color.gray);
		g.drawLine(getLowThreshold(), 5, getLowThreshold(), getHeight() - 5);
		g.drawLine(getHighThreshold(), 5, getHighThreshold(), getHeight() - 5);
	}

	public void mousePressed(MouseEvent e) {
	}

	public void mouseReleased(MouseEvent e) {
	}

	public void mouseExited(MouseEvent e) {
	}

	public void mouseClicked(MouseEvent e) {
	}

	public void mouseEntered(MouseEvent e) {
	}
} // BandPlot class