With libraries like Cairo available, I'm not sure why you'd need to write your own. I've written a "glue" module for Cairo/OSG which lets you use a vector graphics API on a Texture2D "canvas."
For example, the attached image was rendered using Cairo on a small texture (256x256). No image files were loaded or anything like that... http://osgcairo.googlecode.com It's not feature-complete or anything like that, but it demonstrates the concept. On Sat, 2008-07-12 at 22:29 +0100, James Dickson wrote: > I decided to go down the route of writting my own line, circle etc > algorithms as I only need a few, but I have hit a slight snag. :-( I > have attached an image to show the effect I am getting, ideally I > would like the Texture2D which is projected onto the billboard to be > sharper? I.e the lines drawn on the white billboard not to > have blurred edges. The texture resolution is 256x256, and increasing > it only partially helps, are there any filters I can turn on\off for > the texture to help fix it? > > Many thanks, > James > > > 2008/7/11 Jean-Sébastien Guay <[EMAIL PROTECTED]>: > Hi James, > > > I was wondering if it is possible to draw on a > Texture2D instance. I know this isn't possible, but I > am wondering if you can do the equivalent of: > Texture2Dinstance->DrawCircle(x,y,r); > > > OSG does not do 2D drawing to images. You can do your own by > getting the data pointer from an osg::Image and drawing pixels > into that (if you feel the need to write your own line, > circle, flood-filling etc. algorithms :-) ), or you can use an > imaging library (ImageMagick, etc.) to make the image and then > get the data from that library and copy it into an osg::Image > (or perhaps even use the same pointer if it's a raw format). > No need to save the image to disk and re-read it with OSG. > > Hope this helps, > > J-S > -- > ______________________________________________________ > Jean-Sebastien Guay [EMAIL PROTECTED] > http://www.cm-labs.com/ > http://whitestar02.webhop.org/ > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > -- > James Dickson > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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