Hi Dan, Yeah, I think you're right. My event that I've keyed off is GVTRenderingCompleted. I think Thomas is right in that I've got something wrong because I should get new screen coordinates after a completed rendering. I think resetRenderingTransform() is exactly what I needed for that problem, so the GVT tree is less important. Michael
________________________________ From: Dan Slater [mailto:[EMAIL PROTECTED] Sent: Wed 10/29/2008 4:11 PM To: batik-users@xmlgraphics.apache.org Subject: RE: Rendering transform on refresh? Hi, Michael, I would imagine the "old" coordinates come from the previous screenCTM, "new" coords from the updated screenCTM. According to my own tests, upon rerendering the GVTTree (), the old and new screenCTMs can be accessed between the following events: [same screenCTM as previous rendering finished with] GVTTreeBuild Started... 0.24855052 0.0 0.0 0.24855052 393.99997 261.5 [new screenCTM] GVTTreeBuild Completed... 0.08296057 0.0 0.0 0.08296057 394.0 261.50003 This from a GVTTreeBuildListener. I'm afraid I don't have any info on your aspect ratio calcs. Dan -------- Original Message -------- Subject: RE: Rendering transform on refresh? From: "Bishop, Michael W. CONTR J9C880" <[EMAIL PROTECTED]> Date: Wed, October 29, 2008 2:12 pm To: <batik-users@xmlgraphics.apache.org> Hi Dan, I'm using poor terminology. I do want to essentially reset the screen position. I have no (current) need to physically reload/refresh the document from disk, memory, etc. I want a "reset" button to bring the document back to the "default" view after zooming, panning, rotating, etc. And yes, I do use the screenCTM to go from window/ui coordinates to document/user coordinates. For some reason, on setDocument(), I get the "old" coordinates before setDocument, not the ones after. I've used a GVTTreeListener and an SVGOnLoad listener without success. I'm looking for the event where window position 0,0 can be pushed through the screenCTM to get the document/user point visible there. In short, my event comes before that happens and I don't know why. Of course, eliminating calls to setDocument and replacing them to setRenderingTransform(identity) might fix the problem entirely. Long shot, but do you (or anyone) have resources or links for correcting aspect ratios? I've got a miscalculation somewhere. I want to take the parallelogram in document/user space (represented by three points; upper-left, upper-right, and lower-left) and calculate how to properly fit them into the target window, regardless of size and aspect-ratio. This is kind of outside the realm of Batik, but I can't even find any resources that remotely cover this topic. Once I fix the bug with "refresh" (more like reset as you've pointed out), I'm going to be tackling fixing that. Michael ________________________________ From: Dan Slater [mailto:[EMAIL PROTECTED] <http://email.secureserver.net/pcompose.php#Compose> ] Sent: Wed 10/29/2008 11:24 AM To: batik-users@xmlgraphics.apache.org Subject: RE: Rendering transform on refresh? Hi, Michael, I don't think setting the rendering transform refreshes the document, it only changes the screen position. Assuming you knew your points in screen space, couldn't you use getScreenCTM() to translate to common 'document' coords? (I think your document coords are what I call user coords, after all SVG attribute transforms leading to the root are applied to the local element's x,y)? You and Thomas might have covered this in your recent exchanges, I didn't completely follow it. If I understand you correcly, I would register GVT event listeners and check for transforms at various steps (maybe you've done this). It sounds like you need to communicate a transform after some rendering step is completed. You can use the method I mentioned to set/get transforms after any point. For example, I use a GVT listener to set the viewbox to always be 10% larger in each dimension than the doc's bounding box, available via a GVTTreeBuilderListener, GVTBuildStarted. Hopefully I'm not leading you astray... Dan PS On my next refactor I'm probably going to overload setDocument to include a transform parameter, eliminating the need for a separate call to setLastRender. Also, more errata below: I don't override the listener, I register it. -------- Original Message -------- Subject: RE: Rendering transform on refresh? From: "Bishop, Michael W. CONTR J9C880" <[EMAIL PROTECTED]> Date: Wed, October 29, 2008 8:21 am To: <batik-users@xmlgraphics.apache.org> Hi Dan, I think you indirectly answered my question and also gave me an idea to keep in mind. I never thought about preserving the "last" render/transform. What I want to do with setDocument() is have it communicate the "default" transform. For some reason, if I call setDocument(), then fire my event, I'm still getting the "old" transform. I want what I think you described as the identity transform. I need to communicate three points in my event; the upper-left, upper-right, and lower-left of the JSVGCanvas window *in document coordinates* after the "refresh" has occurred. You're describing preserving changes BEFORE setDocument(), I'm trying to capture the state AFTER setDocument() and can't figure out what I need to wait for to get points after the document has refreshed. It sounds like I *could* eliminate the call to setDocument() entirely and simply set the rendering transform to the identity transform (thus refreshing the document), then fire my event? Michael ________________________________ From: Dan Slater [mailto:[EMAIL PROTECTED] <http://email.secureserver.net/pcompose.php#Compose> <http://email.secureserver.net/pcompose.php#Compose> ] Sent: Tue 10/28/2008 6:32 PM To: batik-users@xmlgraphics.apache.org Subject: RE: Rendering transform on refresh? Please forgive the multiple posts...for some reason a follow-up posted before this original (now w/minor edit), and I haven't yet received the original :( . I think with plain text I'll have better success... Hi, Michael, I think I might have the answer. I use a crude undo function to reset the document, but found the render to reset each time. Here's what worked for me: In your extended JSVGCanvas, place an instance field to store the last render transform, and create getter/setter. In the constructor, set the identity transform since this is the default when the canvas is first booted. Then override svgLoadEventDispatchCompleted with a call to setRenderingTransform, which in turn you've already overridden per recent threads. When this is all prepared, call svgCanvas.setLastRender(svgcanvas.getrenderingtransform) (or use whatever transform you wish) and the canvas render should automatically reset after you call setSVGDocument. I can't tell you how much time it took to test the rendering transform in all the event listeners...it's instructive but it would have been extremely helpful to have a concise reference for the complete JSVGCanvas event sequence. Hope this helps some others out there...if anybody knows how to set a listener on the canvas for when the rendering transform changes (I tried and gave up), or has a better way, I'd love to hear about it. public class JSVGCanvasX extends JSVGCanvas { private AffineTransform lastRender = new AffineTransform(); public JSVGCanvasX() { lastRender.setToIdentity(); this.addSVGLoadEventDispatcherListener(new SVGLoadEventDispatcherAdapter() { public void svgLoadEventDispatchCompleted(SVGLoadEventDispatcherEvent e){ //set the rendering transform here, after SVGDocument is loaded but before rendering occurs //canvas transform resets to identity before this event is fired setRenderingTransform(getLastRender()); } } ...etc. } Dan Slater -------- Original Message -------- Subject: Rendering transform on refresh? From: "Bishop, Michael W. CONTR J9C880" <[EMAIL PROTECTED]> Date: Tue, October 28, 2008 3:41 pm To: <batik-users@xmlgraphics.apache.org> I have a refresh function in my application that simply calls setDocument() on the JSVGCanvas with the document already there, basically causing it to reset to its default state without zoom/pan/rotate. I'm also tracking changes to my rendering transform, but keying off setRenderingTransform() doesn't seem to work; it seems to be called before the "final" transform is achieved. What can I wait for to determine when the rendering transform is "done" and ready to be communicated? Maybe computeRenderingTransform? I've tried waiting for the GVT tree to render and for the SVG "onLoad" event, but both seem to be too early and not communicating any change. 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