It seems to me that the primary use of rounded rectangles is for UI's rather than art, and as such, SVG, that supports DOM and events, already has syntax for rounded rectangles. I have seen how the <canvas> folks like to re-invent wheels, but the path syntax within canvas already should allow creation of line arc line arc sequences, and making things too easy would not appeal to the <canvas> machismo would it?
How many rounded rectangles have you ever seen that don't invite mouseclicks? And then do you really want to try to calculate whether or not the mouse event is atop one of those thingies, particularly after it has been rotated, scaled and skewed? I'm just not seeing why <canvas> would need this. Regards David -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Igor Trindade Oliveira Sent: Thursday, June 21, 2012 12:59 PM To: [email protected] Subject: [whatwg] Canvas roundedRect Currently, canvas2d does not have support for rounded rectangles and the web developers are implementing rounded rectangles using arcs or bezier curves.[1][2] So i propose the addition of two new functions: void fillRoundedRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h, unrestricted double xRadius, unrestricted double yRadius); void strokeRoundedRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h, unrestricted double xRadius, unrestricted double yRadius); Where the xRadius and yRadius arguments specify the radii of the ellipses defining the corners of the rounded rectangle. Additionally, if we know that the path is a rounded rectangle, we can make optimizations in the graphics libraries reducing the amount of tesselations. [1] http://www.scriptol.com/html5/canvas/rounded-rectangle.php [2] http://www.supercalifrigginawesome.com/Extending-Canvas-to-Draw-Rounded-Rect angles
