The graphic for the updated http://code.xwiki.org/xwiki/bin/view/Modules/RenderingModule suggests that PDF is one of the outputs of the rendering module, although the document itself says "XWiki Syntax 2.0 (xwiki/2.0), XHTML (xhtml/1.0), Plain Text (plain/1.0)".
Can the new rendering module be used to render a PNG, SVG, GIF, JPG, or Flash, instead of the above? Actually, I guess the best way to phrase this, is there a way to get the rendering module "out of the way" and allow a simple document containing a setContentType() declaration appropriate for the given image at the beginning, followed by a single call to the macro, which would output "binary data". Of course, "plain text" could be used, ultimately, for outputting PNG and xhtml/1.0 for SVG... Lets say I do some Query against all wiki documents, and instead of rendering the query "textually" I want to render it as a graphics image. Given it's capabilities, this might best be achievable with a groovy script. So assume a groovy script which creates, "in memory" a SVG, GIF, PNG, or JPG of the aforementioned query, via Java library calls, glued together with groovy. Lets say I used this example, which outputs SVG: http://www.jroller.com/aalmiray/entry/graphicsbuilder_update_on_svgrenderer how could the SVG get rendered from the groovy script and output directly to the document, rather than being written as an attachment to be included in the document as in is this hypothetical example: 1. def go = { 2. antialias true 3. rect( x: 50, y: 50, w: 100, h: 100, f: 'red', bc: 'darkRed' ) 4. rect( x: 10, y: 10, w: 100, h: 100, f: 'blue', bc: 'navy' ) 5. circle( cx: 150, cy: 150, r: 40, f: 'orange', bc: 'darkOrange' ) 6. star( cx: 100, cy: 100, or: 50, ir: 20, f: 'green', bc: 'darkGreen' ) 7. } 1. def sr = new SVGRenderer() 2. def stream new MemoryStream() /* MemoryStream() is my handwaving for some package that lets you simulate file IO without writing to disk */ 3. sr.renderToFile( stream, 200, 200, go ) 4. def targetDoc = xwiki.getDocument("Groovy.GroovyTest4") 5. targetDoc.addAttachment("PNGGraphicsAttachment", stream.getBytes()); 6. targetDoc.save() One of the reasons one might want to use a "document" to render an image is that if the computation to render took some time, the rest of the surrounding text would appear in the browser first, rather than holding up the whole render. I imagine the current behavior, if, hypothetically, the chart macro took a long time to render a huge dataset, or a TeX equation took long to render into HTML, one could achieve a performance improvement by having the equivalent rendered separately into the browser as an image. The text surrounding any long-running macros wouldn't need to be "held up" until the macro rendered. Streaming images, or even flash, could be used to handle asynchronous updates to this "active document/image." As corollary, wouldn't it be useful to have an additional parameter on macro creation which would allow macros to run as their own document/thread, and automatically insert an iframe for the "subdocument" if the output is HTML/rendered-wikitext, and an image if the output is GIF/JPG/PNG ? Niels http://nielsmayer.com PS: are there any "snippet" or coding examples of outputting "computed images" from Xwiki via groovy? _______________________________________________ devs mailing list devs@xwiki.org http://lists.xwiki.org/mailman/listinfo/devs
