<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.6001.18099" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>I am writing a game using DrScheme (actually am implementing this existing game <A href="http://www.bubblebox.com/play/puzzle/539.htm">http://www.bubblebox.com/play/puzzle/539.htm</A>) and have some questions that I ran into along the way. </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I draw a tiled array of hexagons on a canvas using paths. Now I would like to detect which hexagon is beeing clicked on. One way of implementing this would be to render the hexagons to an offscreen buffer on startup - where each hexagon is drawn using a unique color. When the user clicks on screen, i fetch the color from the offscreen buffer and figure out the hexagon being clicked on. For this I have two questions </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>1) Is it possible to draw a canvas to an offscreen buffer ?</FONT></DIV> <DIV><FONT face=Arial size=2>2) Is it possible to fetch pixel values from a canvas. </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Feel free to suggest any alternative approaches to solving the same problem. </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Thanks,</FONT></DIV> <DIV><FONT face=Arial size=2>Deepankar</FONT></DIV></BODY></HTML>