import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.TexturePaint;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTextField;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class ColorComposite extends JFrame {
MyCanvas canvas;
JTextField textField;
float alphaValue = 0.65f;
public ColorComposite() {
super();
Container container = getContentPane();
canvas = new MyCanvas();
container.add(canvas);
JPanel panel = new JPanel();
JLabel label = new JLabel("Color-Composite: ");
JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 65);
slider.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
JSlider tempSlider = (JSlider) e.getSource();
alphaValue = (float) (tempSlider.getValue() / 100.0);
textField.setText(Float.toString(alphaValue));
canvas.repaint();
}
});
textField = new JTextField("0.65", 4);
panel.add(label);
panel.add(slider);
panel.add(textField);
container.add(BorderLayout.SOUTH, panel);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
setSize(450,450);
setVisible(true);
}
public static void main(String arg[]) {
new ColorComposite();
}
class MyCanvas extends JLabel {
Rectangle2D rec1, rec2, rec3, rec4, rec5;
MyCanvas() {
rec1 = new Rectangle2D.Float(25, 25, 75, 150);
rec2 = new Rectangle2D.Float(125, 25, 100, 75);
rec3 = new Rectangle2D.Float(75, 125, 125, 75);
rec4 = new Rectangle2D.Float(225, 125, 125, 75);
rec5 = new Rectangle2D.Float(150, 50, 125, 175);
setBackground(Color.white);
setSize(400, 225);
}
public void paint(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
AlphaComposite ac = AlphaComposite.getInstance(
AlphaComposite.SRC_OVER, alphaValue);
g2D.setComposite(ac);
g2D.setStroke(new BasicStroke(5.0f));
g2D.draw(rec1);
GradientPaint gp = new GradientPaint(125f, 25f, Color.yellow, 225f,
100f, Color.blue);
g2D.setPaint(gp);
g2D.fill(rec2);
BufferedImage bi = new BufferedImage(5, 5,
BufferedImage.TYPE_INT_RGB);
Graphics2D big = bi.createGraphics();
big.setColor(Color.magenta);
big.fillRect(0, 0, 5, 5);
big.setColor(Color.black);
big.drawLine(0, 0, 5, 5);
Rectangle r = new Rectangle(0, 0, 5, 5);
TexturePaint tp = new TexturePaint(bi, r);
g2D.setPaint(tp);
g2D.fill(rec3);
g2D.setColor(Color.green);
g2D.fill(rec4);
g2D.setColor(Color.red);
g2D.fill(rec5);
}
}
}