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Debugging  RSS feed

 
Lisa Smith
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Posts: 57
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Could use help debugging
/code:
import java.awt.geom.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;

class PaintGradient01{
publicstaticvoid main(String[] args){
GUI guiObj = new GUI();
}//end main
}//end controlling class PaintGradient01

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
//Gradient red to orange, acyclic
Ellipse2D.Double circle2 =
new Ellipse2D.Double(
0.0*ds,-2.0*ds,2.0*ds,2.0*ds);
g2.setPaint(
new GradientPaint(
0.5f*ds,-1.0f*ds,Color.red,
1.5f*ds,-1.0f*ds,Color.orange,false));
g2.fill(circle2);
g2.draw(circle2);

//Lower left quadrant
//Gradient red to orange, cyclic along
//horizontal axis
Ellipse2D.Double circle3 =
new Ellipse2D.Double(
-2.0*ds,0.0*ds,2.0*ds,2.0*ds);
g2.setPaint(
new GradientPaint(
-1.15f*ds,1.0f*ds,Color.red,
-0.85f*ds,1.0f*ds,Color.orange,true));
g2.fill(circle3);
g2.draw(circle3);

//Lower right quadrant
//Gradient red to orange, cyclic along
// 45 degree angle
Ellipse2D.Double circle4 =
new Ellipse2D.Double(
0.0*ds,0.0*ds,2.0*ds,2.0*ds);
g2.setPaint(
new GradientPaint(
0.0f*ds,0.0f*ds,Color.red,
0.25f*ds,0.25f*ds,Color.orange,true));
g2.fill(circle4);
g2.draw(circle4);

}//end overridden paint()

}//end class GUI
//==============================//
/Code
 
Ron Newman
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Please use the UBB code tags to keep the code properly formatted. What is the bug you are trying to diagnose?
 
Don't get me started about those stupid light bulbs.
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