colorpicker.java

很不错的一个获取html色彩值的Applet

/*	ColorPicker v1.0 by Toh Lik Khoong
	Last revised 05/03/2001 dedicated to L.J.W
	Please contact me at [e-mail] for any comments or suggestions
	The source code is strictly for educational purposes and cannot be modified
	or used without the express permission of the author
	Visit http://navsurf.com for the latest version and other useful applets
*/

/*	sample applet for colorpicker
    <applet code=colorpicker.class width=300 height=200>
    </applet>
*/

import java.applet.Applet;
import java.awt.image.MemoryImageSource;
import java.awt.image.PixelGrabber;
import java.awt.*;
import java.awt.event.*;

public class colorpicker extends Applet implements MouseListener, MouseMotionListener, ActionListener{

CanvasHS chs = new CanvasHS();
CanvasB cb = new CanvasB();

TextField tf_r = new TextField("127", 2);
TextField tf_g = new TextField("127", 2);
TextField tf_b = new TextField("127", 2);
TextField tf_hc = new TextField("808080", 6);
Button submit_btn = new Button("Display Color");

Canvas cc = new Canvas();

public void init(){
	setLayout(new BorderLayout());
	setBackground(Color.white);
	Panel p_canvas = new Panel(new FlowLayout(FlowLayout.CENTER, 20, 20));
	Panel p_field = new Panel(new FlowLayout(FlowLayout.CENTER, 20, 20));

	chs.addMouseMotionListener(this);
	chs.addMouseListener(this);
	cb.addMouseMotionListener(this);
	cb.addMouseListener(this);

	p_canvas.add(chs);
	p_canvas.add(cb);

	cc.resize(50, 50);
	cc.setBackground(Color.gray);

	submit_btn.addActionListener(this);

	add(p_canvas, "North");

	p_field.add(new Label("Red:"));
	p_field.add(tf_r);
	p_field.add(new Label("Green:"));
	p_field.add(tf_g);
	p_field.add(new Label("Blue:"));
	p_field.add(tf_b);
	p_field.add(new Label("Hex Code:"));
	p_field.add(tf_hc);
	p_field.add(cc);
	p_field.add(submit_btn);

	add(p_field, "Center");
}

public void mouseClicked( MouseEvent e ){
	processEvent(e);
}
public void mouseEntered( MouseEvent e ){}
public void mouseExited( MouseEvent e ){}
public void mouseReleased( MouseEvent e ){}
public void mousePressed( MouseEvent e ){}

public void mouseDragged( MouseEvent e ){
	processEvent(e);
}
public void mouseMoved( MouseEvent e ){}

private void processEvent( MouseEvent e){
	if (e.getComponent() instanceof CanvasHS){
		cb.refresh(chs.getColorAt(e.getX(), e.getY()));
		cb.repaint();
		Color cur_color = cb.getColor();
		tf_r.setText(Integer.toString(cur_color.getRed()));
		tf_g.setText(Integer.toString(cur_color.getGreen()));
		tf_b.setText(Integer.toString(cur_color.getBlue()));
		tf_hc.setText(Integer.toHexString(cur_color.getRGB() & 0xFFFFFF).toUpperCase());
		cc.setBackground(cur_color);
	}

	if (e.getComponent() instanceof CanvasB){
		Color cur_color = cb.getColorAt(e.getX(), e.getY());
		tf_r.setText(Integer.toString(cur_color.getRed()));
		tf_g.setText(Integer.toString(cur_color.getGreen()));
		tf_b.setText(Integer.toString(cur_color.getBlue()));
		tf_hc.setText(Integer.toHexString(cur_color.getRGB() & 0xFFFFFF).toUpperCase());
		cb.setCursor(e.getY());
		cb.repaint();
		cc.setBackground(cur_color);
	}
}

public void actionPerformed( ActionEvent e ){
	if (e.getActionCommand().equals("Display Color")){
		try{
			if (Integer.parseInt(tf_r.getText()) > 255){
				tf_r.setText("255");
			}
			if (Integer.parseInt(tf_g.getText()) > 255){
				tf_g.setText("255");
			}
			if (Integer.parseInt(tf_b.getText()) > 255){
				tf_b.setText("255");
			}
			Color cur_color = new Color(Integer.parseInt(tf_r.getText()),
										Integer.parseInt(tf_g.getText()),
										Integer.parseInt(tf_b.getText()));
			tf_hc.setText(Integer.toHexString(cur_color.getRGB() & 0xFFFFFF).toUpperCase());
			cb.setCursor(cb.size().height/2);
			cb.refresh(cur_color);
			cc.setBackground(cur_color);
			showStatus(new String());
		}catch(java.lang.NumberFormatException nfe){
			showStatus("Wrong number format entered");
		}
	}
}

public void paint(Graphics g){}
}