Java Tutorial/2D Graphics/Arc

Arc2D Chord

   <source lang="java">

import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.Arc2D; import javax.swing.JComponent; import javax.swing.JFrame; class MyCanvas extends JComponent {

 public void paint(Graphics g) {
   Graphics2D g2 = (Graphics2D)g;
   
   //Draw the chord
   
     Arc2D.Float arc1 = new Arc2D.Float(Arc2D.CHORD);         
     arc1.setFrame(140,30, 67, 46);  
     arc1.setAngleStart(45); 
     arc1.setAngleExtent(270); 
     g2.setColor(Color.blue);  
     g2.draw(arc1);  
     g2.setColor(Color.gray);  
     g2.fill(arc1);  
     g2.setColor(Color.black); 
     g2.drawString("Arc2D.CHORD", 140, 20);  
 }

} public class Graphics2DDrawArcChord {

 public static void main(String[] a) {
   JFrame window = new JFrame();
   window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   window.setBounds(30, 30, 300, 300);
   window.getContentPane().add(new MyCanvas());
   window.setVisible(true);
 }

}</source>

Arc2D OPEN

   <source lang="java">

import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.Arc2D; import javax.swing.JComponent; import javax.swing.JFrame; class MyCanvas extends JComponent {

 public void paint(Graphics g) {
   Graphics2D g2 = (Graphics2D)g;
   
   //Draw the open arc 
   Arc2D.Float arc = new Arc2D.Float(Arc2D.OPEN); 
   arc.setFrame(140,100, 67, 46); 
   arc.setAngleStart(45); 
   arc.setAngleExtent(270); 
   g2.setColor(Color.gray);  
   g2.draw(arc);  
   g2.setColor(Color.green); 
   g2.fill(arc);  
   g2.setColor(Color.black); 
   g2.drawString("Arc2D.OPEN", 140, 90); 
 }

} public class Graphics2DDrawArcOPEN {

 public static void main(String[] a) {
   JFrame window = new JFrame();
   window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   window.setBounds(30, 30, 300, 300);
   window.getContentPane().add(new MyCanvas());
   window.setVisible(true);
 }

}</source>

Arc2D PIE

   <source lang="java">

import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.Arc2D; import javax.swing.JComponent; import javax.swing.JFrame; class MyCanvas extends JComponent {

 public void paint(Graphics g) {
   Graphics2D g2 = (Graphics2D) g;
   // Draw the pie chart
   Arc2D.Float arc = new Arc2D.Float(Arc2D.PIE);
   arc.setFrame(140, 200, 67, 46);
   arc.setAngleStart(45);
   arc.setAngleExtent(270);
   g2.setColor(Color.gray);
   g2.draw(arc);
   g2.setColor(Color.red);
   g2.fill(arc);
   g2.setColor(Color.black);
   g2.drawString("Arc2D.PIE", 140, 190);
 }

} public class Graphics2DDrawArcPIE {

 public static void main(String[] a) {
   JFrame window = new JFrame();
   window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   window.setBounds(30, 30, 300, 300);
   window.getContentPane().add(new MyCanvas());
   window.setVisible(true);
 }

}</source>

Compares two arcs and returns true if they are equal or both null.

   <source lang="java">

import java.awt.geom.Arc2D; public class Main {

 /**
  * Compares two arcs and returns true if they are equal or
  * both null.
  *
  * @param a1  the first arc (null permitted).
  * @param a2  the second arc (null permitted).
  *
  * @return A boolean.
  */
 public static boolean equal(final Arc2D a1, final Arc2D a2) {
     if (a1 == null) {
         return (a2 == null);
     }
     if (a2 == null) {
         return false;
     }
     if (!a1.getFrame().equals(a2.getFrame())) {
         return false;
     }
     if (a1.getAngleStart() != a2.getAngleStart()) {
         return false;
     }
     if (a1.getAngleExtent() != a2.getAngleExtent()) {
         return false;
     }
     if (a1.getArcType() != a2.getArcType()) {
         return false;
     }
     return true;
 }

}</source>

Draw Arc

   <source lang="java">

import java.awt.Graphics; import javax.swing.JComponent; import javax.swing.JFrame; class MyCanvas extends JComponent {

 public void paint(Graphics g) {
   g.drawArc (10, 10, 200, 200,50,50);  
 }

} public class DrawArc {

 public static void main(String[] a) {
   JFrame window = new JFrame();
   window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   window.setBounds(30, 30, 300, 300);
   window.getContentPane().add(new MyCanvas());
   window.setVisible(true);
 }

}</source>

Drawing a Pie Chart

   <source lang="java">

import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Rectangle; import javax.swing.JComponent; import javax.swing.JFrame; class Slice {

 double value;
 Color color;
 public Slice(double value, Color color) {
   this.value = value;
   this.color = color;
 }

} class MyComponent extends JComponent {

 Slice[] slices = { new Slice(5, Color.black), new Slice(33, Color.green),
     new Slice(20, Color.yellow), new Slice(15, Color.red) };
 MyComponent() {
 }
 public void paint(Graphics g) {
   drawPie((Graphics2D) g, getBounds(), slices);
 }
 void drawPie(Graphics2D g, Rectangle area, Slice[] slices) {
   double total = 0.0D;
   for (int i = 0; i < slices.length; i++) {
     total += slices[i].value;
   }
   double curValue = 0.0D;
   int startAngle = 0;
   for (int i = 0; i < slices.length; i++) {
     startAngle = (int) (curValue * 360 / total);
     int arcAngle = (int) (slices[i].value * 360 / total);
     g.setColor(slices[i].color);
     g.fillArc(area.x, area.y, area.width, area.height, startAngle, arcAngle);
     curValue += slices[i].value;
   }
 }

} public class PieChart {

 public static void main(String[] argv) {
   JFrame frame = new JFrame();
   frame.getContentPane().add(new MyComponent());
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

}</source>

Fill Arc

   <source lang="java">

import java.awt.Color; import java.awt.Graphics; import javax.swing.JComponent; import javax.swing.JFrame; class MyCanvas extends JComponent {

 public void paint(Graphics g) {
   g.setColor(Color.RED);
   g.fillArc(20, 20, 200, 200,200,200);
 }

} public class FillArc {

 public static void main(String[] a) {
   JFrame window = new JFrame();
   window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   window.setBounds(30, 30, 300, 300);
   window.getContentPane().add(new MyCanvas());
   window.setVisible(true);
 }

}</source>