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POgetHeight() and getWidth() return 0 for drawing semicircles
 

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  1. POgetHeight() and getWidth() return 0 for drawing semicircles
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    <p>I'm trying to make a gui application which displays a rainbow when run by the user. For whatever reason the semicircles won't show up in the window. I made a debug method and it shows the x and y to both be 0. Could someone tell me what's wrong? </p> <pre><code>import java.awt.Color; import java.awt.Graphics; import java.awt.Container; import javax.swing.JFrame; import javax.swing.JPanel; public class Rainbow extends JPanel { // Declare skyColor: static Color skyColor = Color.CYAN; public Rainbow() { setBackground(skyColor); } // Draws the rainbow. public void paintComponent(Graphics g) { super.paintComponent(g); int width = getWidth(); int height = getHeight(); // Declare and initialize local int variables xCenter, yCenter // that represent the center of the rainbow rings: int xCenter = (1/2)*width; int yCenter = (3/4)*height; // Declare and initialize the radius of the large semicircle: int smallRadius = height/4; int largeRadius = width/4; int mediumRadius = (int) Math.sqrt(smallRadius * largeRadius); g.setColor(Color.RED); g.fillArc(xCenter - largeRadius/2,yCenter - largeRadius/2 + largeRadius/4 -height/4,largeRadius,largeRadius,0,180); // Draw the large semicircle: // Declare and initialize the radii of the small and medium // semicircles and draw them: g.setColor(Color.GREEN); g.fillArc(largeRadius+mediumRadius/2, yCenter-(largeRadius+mediumRadius)/2, mediumRadius, mediumRadius, 0, 180); g.setColor(Color.MAGENTA); g.fillArc(largeRadius+smallRadius/2, yCenter-(largeRadius+smallRadius)/2, smallRadius, smallRadius, 0, 180); // Calculate the radius of the innermost (sky-color) semicircle debug(xCenter,yCenter,smallRadius,largeRadius,mediumRadius); // Draw the sky-color semicircle: // ________________________________________________ } public static void debug(int x,int y,int r1,int r2,int r3) { System.out.println("xCenter is " + x + "."); System.out.println("yCenter is " + y + "."); System.out.println("smallRadius is " + r1 + "."); System.out.println("largeRadius is " + r2 + "."); System.out.println("mediumRadius is " + r3 + "."); } public static void main(String[] args) { JFrame w = new JFrame("Rainbow"); w.setBounds(300, 300, 300, 200); w.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c = w.getContentPane(); c.add(new Rainbow()); w.setVisible(true); } } </code></pre>
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