Drawing with a Gradient Color : Gradient Paint « 2D Graphics « Java Tutorial

1. Java Tutorial
2. 2D Graphics
3. Gradient Paint

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;

import javax.swing.JComponent;
import javax.swing.JFrame;

public class BasicDraw {
  public static void main(String[] args) {
    new BasicDraw();
  }

  BasicDraw() {
    JFrame frame = new JFrame();

    frame.add(new MyComponent());

    frame.setSize(300, 300);
    frame.setVisible(true);
  }

}

class MyComponent extends JComponent {

  public void paint(Graphics g) {
    Graphics2D g2d = (Graphics2D) g;

    Color startColor = Color.red;
    Color endColor = Color.blue;

    int startX = 10, startY = 20, endX = 30, endY = 40;
    
    GradientPaint gradient = new GradientPaint(startX, startY, startColor, endX, endY, endColor);
    g2d.setPaint(gradient);

    g2d.draw(new Rectangle(20,20,200,200));

  }
}

16.18.Gradient Paint
	16.18.1.	Gradients: a smooth blending of shades from light to dark or from one color to another
	16.18.2.	Control the direction of Gradients
	16.18.3.	Horizontal Gradients
	16.18.4.	Vertical Gradient Paint
	16.18.5.	Gradients in the middle
	16.18.6.	Cyclic Gradient Paint
	16.18.7.	Acyclic Gradient Paint
	16.18.8.	String gradient paint
	16.18.9.	A non-cyclic gradient
	16.18.10.	Drawing with a Gradient Color