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  Re-sizable Target Java Paint  (Read 11539 times)
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Offline civarc

Junior Newbie





« Posted 2013-10-28 18:51:28 »

I need this target for an interface I'm working on.. It has to re-size and have several rings of alternating colors. I was able to get 1 circle that resizes but am unsure how to make more circles(obviously smaller and to some sort of ratio to make a target). I tried making another g.fillOval with different values but it wasn't making the target like pattern I wanted. Thanks in advance!

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package target;



import java.awt.*;

import javax.swing.*;

import java.applet.*;




public class Target extends JPanel         //Setting up a graphics window
{
   
   public Target()
   {
      setBackground(Color.BLACK);     //Color constant
     setPreferredSize(new Dimension(250,250));
   }
   
   public void paintComponent(Graphics g)
   {
       
              Dimension d = getSize();
              int x = d.width/2;
              int y = d.height/2;
              int radius = (int) ((d.width < d.height) ? 0.4 * d.width : 0.4 * d.height);
             
       int width = getWidth();        // width of window in pixels
       int height = getHeight();      // height of window in pixels
       

        super.paintComponent(g);       // call superclass to display the panel
       
       
        //Drawing code below
       
       
         g.setColor(Color.cyan);
         g.fillOval(x-radius, y-radius, 2*radius, 2*radius);
         //Here is where I'm not sure! If I do another g.fillOval, I have no clue what i'd change the values to be.

   
         
         
       
   }
   
   
   
   public static void main(String[] args)
    {
        Target panel = new Target();           // window for drawing
   
        JFrame application = new JFrame();           // the program itself
       
        application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   // set frame to exit when it is closed
       application.add(panel);          

        application.setTitle("Target Program");
        application.setSize(500, 500);  // window is 500 pixels wide, 400 high
       application.setVisible(true);          
    }


}
Offline SimonH
« Reply #1 - Posted 2013-10-28 21:14:50 »

If you wanted 5 rings, how about;
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g.setColor(Color.cyan);
g.fillOval(x-radius, y-radius, 2*radius, 2*radius);

int nextRadius=(int)(radius-(radius/5)); // reduce radius by 1/5
g.setColor(Color.red);
g.fillOval(x-nextRadius, y-nextRadius, 2*nextRadius, 2*nextRadius);

nextRadius=(int)(radius-(radius/5)*2); // reduce radius by 2/5
g.setColor(Color.yellow);
g.fillOval(x-nextRadius, y-nextRadius, 2*nextRadius, 2*nextRadius);
and so on...

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