Gradients in java

             
                   Gradients in java swing

 In computer graphics, gradient is a smooth blending of shades from light to dark or from one color to another. In 2D drawing programs and paint programs, gradients are used to create colorful backgrounds and special effects as well as to simulate lights and shadows.
package PRACTICEPROGRAM;

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

class DrawPanel extends JPanel {

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        Graphics2D g2d = (Graphics2D) g;
        GradientPaint gp1 = new GradientPaint(5, 5,
                Color.red, 20, 20, Color.black, true);

        g2d.setPaint(gp1);
        g2d.fillRect(20, 20, 300, 40);

        GradientPaint gp2 = new GradientPaint(5, 25,
                Color.yellow, 20, 2, Color.black, true);

        g2d.setPaint(gp2);
        g2d.fillRect(20, 80, 300, 40);

        GradientPaint gp3 = new GradientPaint(5, 25,
                Color.green, 2, 2, Color.black, true);

        g2d.setPaint(gp3);
        g2d.fillRect(20, 140, 300, 40);

        GradientPaint gp4 = new GradientPaint(25, 25,
                Color.blue, 15, 25, Color.black, true);

        g2d.setPaint(gp4);
        g2d.fillRect(20, 200, 300, 40);

        GradientPaint gp5 = new GradientPaint(0, 0,
                Color.orange, 0, 20, Color.black, true);

        g2d.setPaint(gp5);
        g2d.fillRect(20, 260, 300, 40);
    }
}

public class GradientsExample extends JFrame {

    public GradientsExample() {
        initUI();
    }

    public final void initUI() {

        DrawPanel dpnl = new DrawPanel();
        add(dpnl);

        setSize(350, 350);
        setTitle("Gradients");
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {

        SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                GradientsExample ex = new GradientsExample();
                ex.setVisible(true);
            }
        });
    }
}
 

Our code example presents five rectangles with gradients.
GradientPaint gp4 = new GradientPaint(25, 25,
    Color.blue, 15, 25, Color.black, true);
 

To work with gradients, we use Java Swing's GradientPaint class. By manipulating the color values and the starting end ending points, we can get interesting results.
g2d.setPaint(gp5);

The gradient is activated calling the setPaint() method.

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