Java2D Drawing Process:

Step 1

Step 2

Step 3

Built-in Shape Classes

Step 4

Example 1

import java.applet.*;
import java.awt.*;      // For Graphics, etc.
import java.awt.geom.*; // For Ellipse2D, etc.

public class ShapeExample2 extends Applet {
  private Ellipse2D.Double circle =
    new Ellipse2D.Double(10, 10, 350, 350);
  private Rectangle2D.Double square =
    new Rectangle2D.Double(10, 10, 350, 350);
 public void init()
 {
 setSize (400,400); // sets image size
 }
  public void paint(Graphics g) {
 
    Graphics2D g2d = (Graphics2D)g;
    g2d.fill(circle);
    g2d.draw(square);
  }

   protected Ellipse2D.Double getCircle() {
    return(circle);
  }

}
 

Example 2

Draw Gradient Filled Circle

import java.applet.*;
import java.awt.*;      // For Graphics, etc.
import java.awt.geom.*; // For Ellipse2D, etc.
 

public class GradientPaintExample2 extends Applet {
 private Ellipse2D.Double circle =
    new Ellipse2D.Double(10, 10, 350, 350);
  private GradientPaint gradient =
    new GradientPaint(0, 0, Color.red, 175, 175, Color.yellow,
                      true); // true means to repeat pattern

 public void init()
 {
    setSize (400,400);
 }
  public void paint(Graphics g) {
    Graphics2D g2d = (Graphics2D)g;
    drawGradientCircle(g2d);
  }

  protected void drawGradientCircle(Graphics2D g2d) {
    g2d.setPaint(gradient);
    g2d.fill(getCircle());
    g2d.setPaint(Color.black);
    g2d.draw(getCircle());
  }
 
protected Ellipse2D.Double getCircle() {
    return(circle);
  }
 
}

Stroke Styles

Example 3

Stroke Thickness

import java.awt.*;
import java.applet.*;
import java.awt.geom.*;

public class StrokeThicknessExample2 extends Applet {

  private Ellipse2D.Double circle =
    new Ellipse2D.Double(10, 10, 350, 350);
  private GradientPaint gradient =
    new GradientPaint(0, 0, Color.red, 175, 175, Color.yellow,
                      true); // true means to repeat pattern
 
  public void init()
  {
  GraphicsEnvironment env =
      GraphicsEnvironment.getLocalGraphicsEnvironment();
    env.getAvailableFontFamilyNames();
    setFont(new Font("Counterscraps", Font.PLAIN, 75));
  setSize(400,400);
  }
 
  public void paint(Graphics g) {
    Graphics2D g2d = (Graphics2D)g;
    drawGradientCircle(g2d);
    drawBigString(g2d);
    drawThickCircleOutline(g2d);
  }
 

  protected void drawGradientCircle(Graphics2D g2d) {
    g2d.setPaint(gradient);
    g2d.fill(getCircle());
    g2d.setPaint(Color.black);
    g2d.draw(getCircle());
  }
 
  protected void drawBigString(Graphics2D g2d) {
    g2d.setPaint(Color.black);
    g2d.drawString("Java 2D", 25, 215);
  }

  protected void drawThickCircleOutline(Graphics2D g2d) {
    g2d.setPaint(Color.blue);
    g2d.setStroke(new BasicStroke(8)); // 8-pixel wide pen
    g2d.draw(getCircle());
  }
 
protected Ellipse2D.Double getCircle() {
    return(circle);
  }
 
}
 

Example 4

Dashed Stroke

import java.awt.*;
import java.applet.*;
import java.awt.geom.*;

public class DashedStrokeExample2 extends Applet {

  private Ellipse2D.Double circle =
    new Ellipse2D.Double(10, 10, 350, 350);
  private GradientPaint gradient =
    new GradientPaint(0, 0, Color.red, 175, 175, Color.yellow,
                      true); // true means to repeat pattern
 
  public void init()
  {
  GraphicsEnvironment env =
      GraphicsEnvironment.getLocalGraphicsEnvironment();
    env.getAvailableFontFamilyNames();
    setFont(new Font("Counterscraps", Font.PLAIN, 75));
  setSize(400,400);
  }
 
  public void paint(Graphics g) {
    Graphics2D g2d = (Graphics2D)g;
    drawGradientCircle(g2d);
    drawBigString(g2d);
    drawDashedCircleOutline(g2d);
  }
 

  protected void drawGradientCircle(Graphics2D g2d) {
    g2d.setPaint(gradient);
    g2d.fill(getCircle());
    g2d.setPaint(Color.black);
    g2d.draw(getCircle());
  }
 
  protected void drawBigString(Graphics2D g2d) {
    g2d.setPaint(Color.black);
    g2d.drawString("Java 2D", 25, 215);
  }

  protected void drawDashedCircleOutline(Graphics2D g2d) {
    g2d.setPaint(Color.blue);
    // 30-pixel line, 10-pixel gap, 10-pixel line, 10-pixel gap
    float[] dashPattern = { 30, 10, 10, 10 };
    g2d.setStroke(new BasicStroke(8, BasicStroke.CAP_BUTT,
                                  BasicStroke.JOIN_MITER, 10,
                                  dashPattern, 0));
    g2d.draw(getCircle());
  }

protected Ellipse2D.Double getCircle() {
    return(circle);
  }
 
}
 

Coordinate Transforms

Example 5

Rotation

import java.awt.*;
import java.applet.*;
import java.awt.geom.*;

public class RotationExample2 extends Applet {
  private Color[] colors = { Color.white, Color.black };
 
  private Ellipse2D.Double circle =
    new Ellipse2D.Double(10, 10, 350, 350);
  private GradientPaint gradient =
    new GradientPaint(0, 0, Color.red, 175, 175, Color.yellow,
                      true); // true means to repeat pattern
 
  public void init()
  {
 
  setSize(400,400);
  }
 
  public void paint(Graphics g) {
    Graphics2D g2d = (Graphics2D)g;
    drawGradientCircle(g2d);
    drawThickCircleOutline(g2d);
 g2d.setFont(new Font("Serif",Font.ITALIC,90));
 // Move the origin to the center of the circle.
    g2d.translate(185.0, 185.0);
    for (int i=0; i<16; i++) {
      // Rotate the coordinate system around current
      // origin, which is at the center of the circle.
      g2d.rotate(Math.PI/8.0);
      g2d.setPaint(colors[i%2]);
      g2d.drawString("Java", 0, 0);
    }
  }
 
  protected void drawGradientCircle(Graphics2D g2d) {
    g2d.setPaint(gradient);
    g2d.fill(getCircle());
    g2d.setPaint(Color.black);
    g2d.draw(getCircle());
  }
 
    protected void drawThickCircleOutline(Graphics2D g2d) {
    g2d.setPaint(Color.blue);
    g2d.setStroke(new BasicStroke(8)); // 8-pixel wide pen
    g2d.draw(getCircle());
  }
 
protected Ellipse2D.Double getCircle() {
    return(circle);
  }
 
}