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POJava not calling component's overloaded paintComponent method
 

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  1. POJava not calling component's overloaded paintComponent method
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    <p>First this is part of a homework assignment to create a mosaic image generator. I want the program to repaint in realtime as it finds a image and place it ontop of another (source image).</p> <p>This is code to create the panel in my main function.</p> <p>The last piece mypanel.create() is the mosaic logic. </p> <pre><code>myPanel = new mosiacPanel(sourceFile, sizePercent, pixesize,threads, imageList); //test.setText(Integer.toString(myPanel.getWidth())); JFrame frame2 = new JFrame("COS 226 MOSIAC OF AWESOMENESS BY SLUIPMOORD &amp;&amp; ELEANORASAURUSS"); myPanel.setVisible( true ); myPanel.repaint(); frame2.add(myPanel); if(myPanel.getWidth() &gt; menubar.getWidth()){ frame2.setSize(myPanel.getWidth() , myPanel.getHeight() + menubar.getHeight() ); frame2.repaint(); } else { frame2.setSize(menubar.getWidth() , myPanel.getHeight() + menubar.getHeight() ); } frame2.setVisible( true ); // myPanel.setLocation(170, 4); myPanel.create(); </code></pre> <p>Mosaic panel class code snippet</p> <pre><code>public void create() { ph.createMosiac(imgUrls, this); } @Override protected void paintComponent( Graphics g ) { super.paintComponent(g); g.drawImage( imgToPaint, 0, 0, null ); // System.out.println("paint"); } public void paintTile( BufferedImage img ) { imgToPaint = img; this.repaint(); // this.paintComponent(this.getGraphics()); } </code></pre> <p>I call the paintTile function within create Mosaic Function.</p> <pre><code>public void createMosiac(List&lt;String&gt; fileNames, mosiacPanel parent) { ArrayList&lt;TileImage&gt; srcTiles = new ArrayList&lt;TileImage&gt;(); for( int i = 0; i &lt; fileNames.size(); i++ ) { srcTiles.add( new TileImage( fileNames.get(i), tileSize ) ); } for( int y = 0; y &lt;= (this.getHeight() - tileSize); y += tileSize ) { for( int x = 0; x &lt;= (this.getWidth() - tileSize); x += tileSize ) { int location = 0; double dist, high = 2147483647; for( int i = 0; i &lt; srcTiles.size(); i++ ) { dist = this.getTileImage(x, y).differance( srcTiles.get(i) ); if( (dist &lt; high) ) { high = dist; location = i; } } this.setTileImage( x, y, srcTiles.get(location) ); parent.paintTile(this); } } } </code></pre> <p>That is my program logic. When I uncomment this in the second snippet // this.paintComponent(this.getGraphics()); The program work but it repaints with a horrible flash and i am not one for medical bills when some of my other students within the demo venue are prone to epileptic attacks.</p> <p>If I trace trace the paintComponent function it get called twice at the end of the program and not on every repaint.</p> <p>Thank you in advance.</p> <p>I added a source code you guys can just copy and run. Select a image you want to test with the default is not available currently because you guys don't have it </p> <p>and then a directory containing a bunch of jpg to tile it with It is pretty slow at the moment i still need to fix that <a href="https://docs.google.com/file/d/0B1QbUvYjuQe1LUVDR1NQZlJzQms/edit" rel="noreferrer">Google docs link to the java file</a></p>
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    1. USGerhard Janse van Rensburg
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    1. COFor better help sooner, please include an [sscce](http://sscce.org)
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    2. COYou should not be calling `paintComponent(...)` directly nor should you be using `getGraphics()` on a component to get the Graphics object. Instead use the Graphics object from the JVM (unless you're working with a BufferedImage's Graphics object). The Swing graphics tutorials explains all of this.
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      1. USHovercraft Full Of Eels
    3. COWonder how this `parent.paintTile(this)` compile?
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