2008/10/27 Michael Van Canneyt <[EMAIL PROTECTED]>: > Hi, > > How can I rotate a bitmap 90° counterclockwise ?
Wouldn't a rotation matrix do the trick? I remember the old fpGUI code (gfxbase.pas) unit used a 3x3 matrix to do translations and scalations calculations. I would imagine the same could be applied for rotation. Wikipedia has some articles on rotation matrix, but the formulas look scary. ;-) Google revealed a lot of links on rotation matrix. > Alternatively, how can I read/write the pixels in the bitmap ? The TFPCustomCanvas.Colors[] array? Regards, - Graeme - _______________________________________________ fpGUI - a cross-platform Free Pascal GUI toolkit http://opensoft.homeip.net/fpgui/ _______________________________________________ Lazarus mailing list Lazarus@lazarus.freepascal.org http://www.lazarus.freepascal.org/mailman/listinfo/lazarus
