/*PaintColor01.java 12/12/99
 Copyright 1999, R.G.Baldwin
  
 Illustrates use of a Paint object to fill a Shape with
 a solid color.
  
 Draws a 4-inch by 4-inch Frame on the screen.
  
 Translates the origin to the center of the Frame.
  
 Draws a pair of X and Y-axes centered on the 
 new origin.
  
 Draws one 2-inch diameter circle in each quadrant.
  
 Fills upper left circle with solid red.
 Fills upper right circle with solid green
 Fills lower left circle with solid blue
 Fills lower right circle with solid yellow
  
 Whether the dimensions in inches come out right or not
 depends on whether the method getScreenResolution()
 returns the correct resolution for your screen.
  
 Tested using JDK 1.2.2 under WinNT Workstation 4.0
 *******************************************/
 import java.awt.geom.*;
 import java.awt.*;
 import java.awt.event.*;
 import java.awt.image.*;
  
 class PaintColor01{
   publicstaticvoid main(String[] args){
     GUI guiObj = new GUI();
   }//end main
 }//end controlling class PaintColor01
  
 class GUI extends Frame{
   int res;//store screen resolution here
   staticfinalint ds = 72;//default scale, 72 units/inch
   staticfinalint hSize = 4;//horizonal size = 4 inches
   staticfinalint vSize = 4;//vertical size = 4 inches
   
   GUI(){//constructor
     //Get screen resolution
     res = Toolkit.getDefaultToolkit().
                                      getScreenResolution();
     //Set Frame size
     this.setSize(hSize*res,vSize*res);
     this.setVisible(true);
     this.setTitle("Copyright 1999, R.G.Baldwin");
         
     //Window listener to terminate program.
     this.addWindowListener(new WindowAdapter(){
       public void windowClosing(WindowEvent e){
         System.exit(0);}});
   }//end constructor
   //-----------------------------------------------------//
   
   //Override the paint() method
   public void paint(Graphics g){
     //Downcast the Graphics object to a Graphics2D
     // object
     Graphics2D g2 = (Graphics2D)g;
     
     //Scale device space to produce inches on the 
     //screen based on actual screen resolution.
     g2.scale((double)res/72,(double)res/72);
  
     //Translate origin to center of Frame
     g2.translate((hSize/2)*ds,(vSize/2)*ds);
     
     //Draw x-axis
     g2.draw(new Line2D.Double(
                                        -1.5*ds,0.0,1.5*ds,0.0));
     //Draw y-axis
     g2.draw(new Line2D.Double(
                                         0.0,-1.5*ds,0.0,1.5*ds));
     
     //Upper left quadrant, Solid red fill
     Ellipse2D.Double circle1 = new Ellipse2D.Double(
                             -2.0*ds,-2.0*ds,2.0*ds,2.0*ds);
     g2.setPaint(new Color(255,0,0));//red
     g2.fill(circle1);
     g2.draw(circle1);
     
     //Upper right quadrant, Solid green fill
     Ellipse2D.Double circle2 = new Ellipse2D.Double(
                              0.0*ds,-2.0*ds,2.0*ds,2.0*ds);
     g2.setPaint(new Color(0,255,0));//green
     g2.fill(circle2);
     g2.draw(circle2);
     
     //Lower left quadrant, Solid blue fill
     Ellipse2D.Double circle3 = new Ellipse2D.Double(
                              -2.0*ds,0.0*ds,2.0*ds,2.0*ds);
     g2.setPaint(new Color(0,0,255));//blue
     g2.fill(circle3);
     g2.draw(circle3);
     
     //Lower right quadrant, Solid yellow fill
     Ellipse2D.Double circle4 = new Ellipse2D.Double(
                               0.0*ds,0.0*ds,2.0*ds,2.0*ds);
     g2.setPaint(new Color(255,255,0));//yellow
     g2.fill(circle4);
     g2.draw(circle4);    
  
   }//end overridden paint()
     
 }//end class GUI
 //================================//


Figure 7