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Thread: My bullseye won't show

  1. #1
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    Default My bullseye won't show

    I'm working on a java assignment that requires me to draw a bullseye using Java.
    I think the code is straight, but it would draw anything--it just gives me a blank screen.

    Any help is appreciated

    Drawing the bullseye
    //Jeremiah A. Walker
    //Bullseye
     
    import java.awt.*;
    import javax.swing.*;
     
     
    public class BullsEye extends JPanel
    {
    	public static void bullsEye(Graphics g, int x, int y, int diam, int count)
    	{
    		int r = diam; //fill oval uses width and height, I will use diam here
    		int xloc = x;
    		int yloc = y;
    		int offset = 0;
    		boolean change = true;
     
    		for(int j = 0; j < count; j++)
    		{
    			//must cast int divisor to float
    			//then cast the final result back to int
    			//also multiplying by r so its a percentage of diam
    			offset = (int)(r*(j*(1/(float)(count))));
    			if(change)
    			{
    				g.setColor(Color.BLACK);
    				change = false;
    			} else {
    				g.setColor(Color.RED);
    				change = true;
    			}//end if/else
                    g.fillOval(xloc + offset/2, yloc + offset/2, r - offset, r - offset);
    		}//end for
    	}//end method bullsEye
    }//end class BullEye

    //Jeremiah A. Walker
    //Tester Program for SmileyFace.java
    //See SmileyFace.java for notes
     
    import javax.swing.*;
     
    public class BullsEyeTest
    {
    	public static void main( String[] args )
    	{
    		BullsEye panel = new BullsEye();
    		JFrame application = new JFrame();
     
    		application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    		application.add( panel );
    		application.setSize( 230, 250 );
    		application.setVisible( true );
    	}//end main
    }//end class SmileyFaceTest


  2. #2
    Administrator copeg's Avatar
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    Default Re: My bullseye won't show

    When do you expect your drawing code to be called? Add some println's in there to see its being called. I also recommend reading the following:
    Lesson: Performing Custom Painting (The Java™ Tutorials > Creating a GUI With JFC/Swing)

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