Paints : Paint « 2D Graphics GUI « Java


 * Copyright (c) 2000 David Flanagan.  All rights reserved.
 * This code is from the book Java Examples in a Nutshell, 2nd Edition.
 * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
 * You may study, use, and modify it for any non-commercial purpose.
 * You may distribute it non-commercially as long as you retain this notice.
 * For a commercial use license, or to purchase the book (recommended),
 * visit

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.TexturePaint;
import java.awt.font.GlyphVector;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JPanel;

/** A demonstration of Java2D transformations */
public class Paints extends JPanel {
  static final int WIDTH = 800, HEIGHT = 375; // Size of our example

  public String getName() {
    return "Paints";

  public int getWidth() {
    return WIDTH;

  public int getHeight() {
    return HEIGHT;

  /** Draw the example */
  public void paint(Graphics g1) {
    Graphics2D g = (Graphics2D) g1;
    // Paint the entire background using a GradientPaint.
    // The background color varies diagonally from deep red to pale blue
    g.setPaint(new GradientPaint(0, 0, new Color(150, 0, 0), WIDTH, HEIGHT,
        new Color(200, 200, 255)));
    g.fillRect(0, 0, WIDTH, HEIGHT); // fill the background

    // Use a different GradientPaint to draw a box.
    // This one alternates between deep opaque green and transparent green.
    // Note: the 4th arg to Color() constructor specifies color opacity
    g.setPaint(new GradientPaint(0, 0, new Color(0, 150, 0), 20, 20,
        new Color(0, 150, 0, 0), true));
    g.setStroke(new BasicStroke(15)); // use wide lines
    g.drawRect(25, 25, WIDTH - 50, HEIGHT - 50); // draw the box

    // The glyphs of fonts can be used as Shape objects, which enables
    // us to use Java2D techniques with letters Just as we would with
    // any other shape. Here we get some letter shapes to draw.
    Font font = new Font("Serif", Font.BOLD, 10); // a basic font
    Font bigfont = // a scaled up version
    font.deriveFont(AffineTransform.getScaleInstance(30.0, 30.0));
    GlyphVector gv = bigfont.createGlyphVector(g.getFontRenderContext(),
    Shape jshape = gv.getGlyphOutline(0); // Shape of letter J
    Shape ashape = gv.getGlyphOutline(1); // Shape of letter A
    Shape vshape = gv.getGlyphOutline(2); // Shape of letter V

    // We're going to outline the letters with a 5-pixel wide line
    g.setStroke(new BasicStroke(5.0f));

    // We're going to fake shadows for the letters using the
    // following Paint and AffineTransform objects
    Paint shadowPaint = new Color(0, 0, 0, 100); // Translucent black
    AffineTransform shadowTransform = AffineTransform.getShearInstance(
        -1.0, 0.0); // Shear to the right
    shadowTransform.scale(1.0, 0.5); // Scale height by 1/2

    // Move to the baseline of our first letter
    g.translate(65, 270);

    // Draw the shadow of the J shape
    g.translate(15, 20); // Compensate for the descender of the J
    // transform the J into the shape of its shadow, and fill it
    g.translate(-15, -20); // Undo the translation above

    // Now fill the J shape with a solid (and opaque) color
    g.setPaint(; // Fill with solid, opaque blue
    g.fill(jshape); // Fill the shape
    g.setPaint(; // Switch to solid black
    g.draw(jshape); // And draw the outline of the J

    // Now draw the A shadow
    g.translate(75, 0); // Move to the right
    g.setPaint(shadowPaint); // Set shadow color
    g.fill(shadowTransform.createTransformedShape(ashape)); // draw shadow

    // Draw the A shape using a solid transparent color
    g.setPaint(new Color(0, 255, 0, 125)); // Transparent green as paint
    g.fill(ashape); // Fill the shape
    g.setPaint(; // Switch to solid back
    g.draw(ashape); // Draw the outline

    // Move to the right and draw the shadow of the letter V
    g.translate(175, 0);

    // We're going to fill the next letter using a TexturePaint, which
    // repeatedly tiles an image. The first step is to obtain the image.
    // We could load it from an image file, but here we create it
    // ourselves by drawing a into an off-screen image. Note that we use
    // a GradientPaint to fill the off-screen image, so the fill pattern
    // combines features of both Paint classes.
    BufferedImage tile = // Create an image
    new BufferedImage(50, 50, BufferedImage.TYPE_INT_RGB);
    Graphics2D tg = tile.createGraphics(); // Get its Graphics for drawing
    tg.fillRect(0, 0, 50, 50); // Fill tile background with pink
    tg.setPaint(new GradientPaint(40, 0,, // diagonal gradient
        0, 40, Color.gray)); // green to gray
    tg.fillOval(5, 5, 40, 40); // Draw a circle with this gradient

    // Use this new tile to create a TexturePaint and fill the letter V
    g.setPaint(new TexturePaint(tile, new Rectangle(0, 0, 50, 50)));
    g.fill(vshape); // Fill letter shape
    g.setPaint(; // Switch to solid black
    g.draw(vshape); // Draw outline of letter

    // Move to the right and draw the shadow of the final A
    g.translate(160, 0);

    g.fill(ashape); // Fill letter A
    g.setPaint(; // Revert to solid black
    g.draw(ashape); // Draw the outline of the A
  public static void main(String[] a) {
    JFrame f = new JFrame();
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
    f.setContentPane(new Paints());

Related examples in the same category

1.Draw stringDraw string
2.Draw canvas with color and textDraw canvas with color and text
3.Anti AliasAnti Alias
4.Program to draw gridsProgram to draw grids
6.Picture Scaler
7.Radial GradientRadial Gradient
8.Rotation About Center
9.Safe Repaint
10.Scale Test
11.Scaling Methods
12.Simple Attributes of painting
13.Two Stops GradientTwo Stops Gradient
14.Bad vs. Good Primitive Rendering
15.Static methods for some common painting functions
16.Set Text Anti Aliasing
17.Graphics Util: draw shapes and text
18.Utilties for painting visual effects
19.Your own Graphics2D
20.Reads a Paint object that has been serialised
21.A panel that displays a paint sample.