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Thread: Circles (Loops)

  1. #1
    Zebra's Avatar
    Zebra is offline Member
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    Default Circles (Loops)

    I have to write and applet in which I draw 4 concentric circles. I have to use this code looped 4 times. Not only do I have to loop it. I have to make each circle. Each circle's radius must be twice as large as the circle before it.

    Java Code:
    g.drawOval()
    Thanks.
    I am a Java n00b.

  2. #2
    hardwired's Avatar
    hardwired is offline Senior Member
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    Default

    Java Code:
    // <applet code="ConcentricApplet" width="400" height="400"></applet>
    import java.awt.*;
    import javax.swing.*;
    
    public class ConcentricApplet extends JApplet {
        public void init() {
            setLayout(new BorderLayout());
            add(new ConcentricPanel());
        }
    }
    
    class ConcentricPanel extends JPanel {
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2 = (Graphics2D)g;
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                                RenderingHints.VALUE_ANTIALIAS_ON);
            int w = getWidth();
            int h = getHeight();
            int r = Math.min(w, h)/8;
            int cx = w/2;
            int cy = h/2;
            for(int i = 0; i < 4; i++) {
                int d = (i+1)*r;
                int x = cx - d/2;
                int y = cy - d/2;
                g2.drawOval(x, y, d, d);
            }
        }
    }

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