sdh@thumper.UUCP (01/27/87)
To answer the question on how to plot a single poinr faster than MoveTo(x,y) LineTo(x,y) with a pensize of 1,1: consider what you want. You want to set a single but on the screen. No sweat. Here's a way to do it: Create a bitmap that has 1 pixel in it. It would need a 2 byte bitmap, and a rectangle that's 1x1. Use CopyBits to put it where you want it to go. You want the source rectangle to be the bitmap bounds, the destination to be the x,y,x+1,y+1, the destination bitmap is the thePort->portbits, and the clip region will probably be nil. There is a more direct way. You calculate the begining address of screen memory and find the byte that you want to write into, and what bit needs to be turned on. This will probably be the optimal method, but you don't get all the wonderful clipping. If you want to save the bit image on the screen because you are putting a window over (from a dialog box or some such), you should know what the coordinates of the window to be drawn are, and you use CopyBits to copy the image that will be covered up by that rectangle to an off screen bitmap. To refresh, do the reverse. Steve "I've been away from Mac programming so this sounds sketchy" Hawley (ucbvax, decvax)!bellcore!sdh