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POJava Applet painting clips to [195,200] despite resize
 

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  1. POJava Applet painting clips to [195,200] despite resize
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    <h2>Intention</h2> <p>I have a <code>java.applet.Applet</code> subclass <code>MyApplet</code> with a <code>java.awt.Canvas</code> subclass <code>MyCanvas</code> added to it.</p> <p>My code changes the size of <code>MyApplet</code> to <code>new Dimension(600,400)</code> and changes the size of <code>MyCanvas</code> to match.</p> <p>When <code>MyCanvas</code> is <code>paint</code>ed, it should</p> <ol> <li>fill its <strong>whole area</strong> with <strong>red</strong></li> <li>draw a <strong>blue circle</strong> of width 300 and height 300.</li> </ol> <h2>Problem</h2> <p>Instead (when run as a Java Applet from Eclipse), the paint of <code>MyCanvas</code> clips to a far smaller area than 600,400 (I measured it to be 195,200) even though <code>MyApplet</code> resizes correctly. <a href="http://dl.dropbox.com/u/196227/MyAppletContents.png" rel="nofollow noreferrer">This is what it looks like.</a> </p> <p><img src="https://i.stack.imgur.com/8AApg.png" alt="enter image description here"></p> <p>The printouts are OK too -- see bottom of post.</p> <h2>Code</h2> <p>This is my code:</p> <pre><code>import java.applet.Applet; import java.awt.Canvas; import java.awt.Color; import java.awt.Graphics; public class MyApplet extends Applet { Canvas mainCanvas; public void init() { // Set the size of the applet setSize(600, 400); // Print dimensions System.out.println("Applet dimensions: " + getSize()); // Make a canvas with the same sizes as this applet mainCanvas = new MyCanvas(getWidth(), getHeight()); add(mainCanvas); } public class MyCanvas extends Canvas { public MyCanvas(int w, int h) { setSize(w, h); System.out.println("Canvas dimensions: " + getSize()); } public void paint(Graphics g) { g.setColor(Color.RED); System.out.println("Canvas dimensions when painting: " + getSize()); g.fillRect(0, 0, getWidth(), getHeight()); } } } </code></pre> <h2>Printouts</h2> <p>It produces the following printout:</p> <pre><code>Applet dimensions: java.awt.Dimension[width=600,height=400] Canvas dimensions: java.awt.Dimension[width=600,height=400] Canvas dimensions when painting: java.awt.Dimension[width=600,height=400] Canvas dimensions when painting: java.awt.Dimension[width=600,height=400] </code></pre> <p>The sizes are correct throughout!</p> <h2>Attempted solutions</h2> <ul> <li>I tried <code>setBounds()</code> instead of <code>setSize()</code> both in <code>MyApplet</code> and <code>MyCanvas</code> just in case the position was offset toward the top-left. This just shifted the circle -- the clip persisted.</li> </ul> <p>Am I missing something?</p>
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    1. USAndrew Thompson
    1. USAnko
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    1. CO"My code changes the size of `MyApplet`.." If you can find one browser that resizes an applet according to Java code, I'll find two that won't.
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      1. USAndrew Thompson
    2. COI know. This is for testing. I don't want to re-JAR my code and open a browser every time I test my applet. Even if I did bother, I couldn't use the debugger.
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