On Wednesday, May 30, 2007 5:34 PM Oliver Saggau wrote >I found following article on the internet: > http://www.imagemagick.org/Usage/distorts/#map_trapezoidal > > The article discribes how to use 2D distortion map to scale each row of > an image so it has a trapezoidal look. But I couldn't get this to work > with SVG's displacement map.
I think the trick using displacement is that one would typically use a gradient to provide the distortion. See for example http://srufaculty.sru.edu/david.dailey/svg/newstuff/filterDisplacementMap5a.svg However the only types of gradients one has in SVG are radial and linear. Hence defining a truly trapezoidal shape through a greyscale map is not going to happen using a simple gradient. One could stitch together several piecewise - linear maps to simulate a trapezoidal one and then apply that -- or one could sample a subset of a radial gradient that mimics a trapezoid I think. And of course one could build a trapezoidal gradient with script by hooking simple monochromatic paths together. This example http://srufaculty.sru.edu/david.dailey/svg/waves.html uses scripted gradients to provide a distortion -- it may give an idea of what I'm trying to say. David ----- To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click "edit my membership" ---- Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/svg-developers/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
