import java.awt.*;
import java.awt.event.*;

import java.applet.Applet;

public class ColorTest extends java.applet.Applet
    implements ColorChangeListener {

    ColorControls RGBcontrols, HSBcontrols;
    Canvas swatch;

    public static void main(String[] args) 
    {
	Frame theFrame = new Frame("Color Test");
	Applet theApplet = new ColorTest();

	theFrame.add(theApplet, "Center");
	theFrame.setLocation(50, 50);
	theFrame.setSize(700, 150);

	WindowListener w = new WindowAdapter() {
		public void windowClosing(WindowEvent e) 
		    {
			System.exit(0);
		    }
	    };
	theFrame.addWindowListener(w);
		
	theApplet.init();
	theFrame.setVisible(true);
    }
    
    public void colorChanged(ColorChangeEvent evt)
    {
	if (evt.generator == RGBcontrols) {
	    if (evt.changer == ColorChangeEvent.SCROLLBAR) {
		scrollUpdate(RGBcontrols);
	    }
	    else {
		textUpdate(RGBcontrols);
	    }
	}
	else {
	    if (evt.changer == ColorChangeEvent.SCROLLBAR) {
		scrollUpdate(HSBcontrols);
	    }
	    else {
		textUpdate(HSBcontrols);
	    }
	}
    }
    
    public void init()
    {
	setLayout(new GridLayout(1, 3, 5, 15));

	// The color swatch
	swatch = new Canvas();
	swatch.setBackground(Color.black);

	// The subpanels for the controls
	RGBcontrols = new ColorControls(this, "Red", 255, "Green", 255, "Blue",
	    255);
	HSBcontrols = new ColorControls(this, "Hue", 360, "Saturation", 100,
	    "Brightness", 100);

	// Add it all to the layout
	add(swatch);
	add(RGBcontrols);
	add(HSBcontrols);
    }

    public Insets getInsets() {
	return new Insets(10, 10, 10, 10);
    }

    void textUpdate(ColorControls controlPanel) {
	Color c;
	// get string values from text fields, convert to ints
	int value1 = Integer.parseInt(controlPanel.tfield1.getText());
	int value2 = Integer.parseInt(controlPanel.tfield2.getText());
	int value3 = Integer.parseInt(controlPanel.tfield3.getText());

	if (controlPanel == RGBcontrols) { // RGB changed, convert HSB

	    // set RGB Scroll fields
	    RGBcontrols.sb1.setValue(value1);
	    RGBcontrols.sb2.setValue(value2);
	    RGBcontrols.sb3.setValue(value3);

	    c = new Color(value1, value2, value3);
	    // convert RGB values to HSB values
	    float[] HSB = Color.RGBtoHSB(value1, value2, value3,
		null /*(new float[3])*/);
	    HSB[0] = HSB[0] * 360;
	    HSB[1] = HSB[1] * 100;
	    HSB[2] = HSB[2] * 100;

	    HSBcontrols.tfield1.setText(String.valueOf((int)HSB[0]));
	    HSBcontrols.tfield2.setText(String.valueOf((int)HSB[1]));
	    HSBcontrols.tfield3.setText(String.valueOf((int)HSB[2]));

	    // set HSB Scroll fields
	    HSBcontrols.sb1.setValue((int)HSB[0]);
	    HSBcontrols.sb2.setValue((int)HSB[1]);
	    HSBcontrols.sb3.setValue((int)HSB[2]);
	}
	else {  // HSB has changed, update RGB
	    // set HSB Scroll fields
	    HSBcontrols.sb1.setValue(value1);
	    HSBcontrols.sb2.setValue(value2);
	    HSBcontrols.sb3.setValue(value3);

	    c = Color.getHSBColor((float)value1 / 360, 
		(float)value2 / 100, (float)value3 / 100);

	    // reset RGB fields
	    RGBcontrols.tfield1.setText(String.valueOf(c.getRed()));
	    RGBcontrols.tfield2.setText(String.valueOf(c.getGreen()));
	    RGBcontrols.tfield3.setText(String.valueOf(c.getBlue()));

	    // set RGB Scroll fields
	    RGBcontrols.sb1.setValue(c.getRed());
	    RGBcontrols.sb2.setValue(c.getGreen());
	    RGBcontrols.sb3.setValue(c.getBlue());
	}

	// Update swatch
	swatch.setBackground(c);
	swatch.repaint();
    }

    void scrollUpdate(ColorControls controlPanel) {
	Color c;
	// Get string slider values 
	int value1 = controlPanel.sb1.getValue();
	int value2 = controlPanel.sb2.getValue();
	int value3 = controlPanel.sb3.getValue();

	if (controlPanel == RGBcontrols) {  // RGB has changed, convert HSB
	    RGBcontrols.tfield1.setText(String.valueOf (value1));
	    RGBcontrols.tfield2.setText(String.valueOf (value2));
	    RGBcontrols.tfield3.setText(String.valueOf (value3));

	    c = new Color(value1, value2, value3);

	    // Convert RGB values to HSB values
	    float[] HSB = Color.RGBtoHSB(value1, value2, value3,
		null /*(new float[3])*/);
	    HSB[0] *= 360;
	    HSB[1] *= 100;
	    HSB[2] *= 100;

	    // Reset HSB fields
	    HSBcontrols.tfield1.setText(String.valueOf((int)HSB[0]));
	    HSBcontrols.tfield2.setText(String.valueOf((int)HSB[1]));
	    HSBcontrols.tfield3.setText(String.valueOf((int)HSB[2]));

	    // Set HSB Scrolls
	    HSBcontrols.sb1.setValue((int)HSB[0]);
	    HSBcontrols.sb2.setValue((int)HSB[1]);
	    HSBcontrols.sb3.setValue((int)HSB[2]);
	}
	else {  // HSB has changed, update RGB
	    HSBcontrols.tfield1.setText(String.valueOf (value1));
	    HSBcontrols.tfield2.setText(String.valueOf (value2));
	    HSBcontrols.tfield3.setText(String.valueOf (value3));
	    c = Color.getHSBColor((float)value1 / 360,
		(float)value2 / 100, (float)value3 / 100);
	    // reset RGB fields
	    RGBcontrols.tfield1.setText(String.valueOf(c.getRed()));
	    RGBcontrols.tfield2.setText(String.valueOf(c.getGreen()));
	    RGBcontrols.tfield3.setText(String.valueOf(c.getBlue()));
	    // set RGB Scrolls
	    RGBcontrols.sb1.setValue(c.getRed());
	    RGBcontrols.sb2.setValue(c.getGreen());
	    RGBcontrols.sb3.setValue(c.getBlue());
	}
	//update swatch
	swatch.setBackground(c);
	swatch.repaint();
    }
}