I'm not completley sure what's going on in your app, but you might be seeing the effect of Swing's use of a back buffer. That is, in an AWT app, you see the graphics on the screen at the same time that you draw them. But in Swing, all graphics are rendered to the back buffer and you only see them on the screen when the back buffer is copied to the screen.
If you want to present the data as it becomes available, only do the rendering itself in the paintComponent() method. You could use a separate thread to prepare the data and then, whenever you are ready to display new data, call repaint() on the component, which will eventually call your paintComponent() method, which will quickly display only the data that you have specified is ready.
Hope that helps.
Chet. Java2D
Praveen Kysetti wrote:
Hi, I am trying to render a tiled OffScreen image onto a JPanel one tile at a time. It works fine if I use the AWT Canvas or it even works if its a JPanel added into a AWT ScrollPane but doesn't work if its pure swing. In a swing component it waits for all the tiles to be loaded before it draws it onto the JPanel. Is it possibly because the computing thread hanging. I have attached my paint method for the JPanel below. It might give you some idea of what I want to do. I can't figure out what's wrong. Hope you can give some suggestions. Any help is appreciated.
Thanks, Regards, Praveen ****************************************************************************** public synchronized void paintComponent(Graphics g) { Graphics2D g2D = (Graphics2D)g; Rectangle clipBounds = g.getClipBounds(); txmin = XtoTileX(clipBounds.x); txmax = XtoTileX(clipBounds.x + clipBounds.width - 1); tymin = YtoTileY(clipBounds.y); tymax = YtoTileY(clipBounds.y + clipBounds.height - 1); AffineTransform transform = AffineTransform.getTranslateInstance(0 , 0 ); offScrGraphics.drawRenderedImage(im.getSubImage(txmin, tymin, clipBounds.width, clipBounds.height), transform); shape i; int num_annotations = list.size(); for(int i1 = 0; i1 < num_annotations; i1++) { i = (shape)list.get(i1); i.paint(offScrGraphics); } for (tj = tymin; tj <= tymax; tj++) { for (ti = txmin; ti <= txmax; ti++) { AffineTransform transform1 = AffineTransform.getTranslateInstance(0 , 0 ); g2D.drawRenderedImage(offScrTile.getSubImage(ti*tileWidth , tj*tileHeight, tileWidth , tileHeight), transform1); } } }
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