We finally got everything pretty much working, thanks largely to your (Thomas DeWeese's) help.
We have one more issue that I am having trouble solving. Here is the setup:
(Since the document is so big, I cannot get the entire vertical dimension on my screen so my example is dealing with the problem in the horizontal dimension. It seems likely that this would happen in the vertical dimension as well, but I have not tried this with a different document yet.)
Ok, so this is caused by my 'fix' of using the visible bounds (which you need otherwise when you zoom in it will still take lots of memory). In the case you describe the visible bounds change without causing a repaint. Unfortunately this is not going to be trivial to fix, and I can't really do it since I don't have the scrolling code.
A quick sketch:
JGVTComponent.paintComponent needs to account for the visibleRect x/y used for the last GVT rendering when drawing it's image (append a translate transform to the graphics before the paintingTransform).
You need to register a ChangeListener on the JViewport so you can schedule a GVT rendering (just call scheduleGVTRendering) when the viewport size or location changes.
I think that will do it, but this is getting complex and I would expect that I am missing something.
o Display the document (745 X 1246) in a window with the ScrollCanvas. o It is irrelevant if the document is entirely visible or not in either dimension initially. o Zoom in slightly. (Like 105% of what it was) o Expand the visible area of the window (if necessary) to see the whole document. o The document is now chopped off on the right, seemingly being clipped at the SVG document's unscaled size o Now shrink the window, the scroll bars act appropriately and seem to have the correct bounds o Without scrolling, a return my window to its original size. The document is chopped as before o Shrink the window again o Scroll horizontally, The whole document can be viewed. o Enlarge the window to see the whole document, and it is chopped off again. o Vertical scrolling works and as no affect on the chopped regions.
If I first zoom to 80% and then to 85%, it works correctly. Not until I get above 100% do I have the problem. Where should I look to find and fix this problem. The scroll canvas appears to be doing everything correctly as far as I can tell.
Also, as I was looking around I noticed this in GVTComponent:
public void setGraphicsNode(GraphicsNode gn) { setGraphicsNode(gn, true); initialTransform = new AffineTransform(); updateRenderingTransform(); setRenderingTransform(initialTransform, true); }
Is this supposed to be:
public void setGraphicsNode(GraphicsNode gn) { setGraphicsNode(gn, true); initialTransform = new AffineTransform(); if (updateRenderingTransform()) setRenderingTransform(initialTransform, true); }
No when you set a graphics node you always want to do a new rendering (not just if the rendering transform hasn't changed).
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