alien@piccolo.ecn.purdue.edu (Yin Chan) (03/10/91)
Hi everybody, I am working on the Athena Widget set. I am supposed to draw some things like circles, squares etc on a window. But since there are so many of them that I want to put them in a sort of very large pixmap (bigger than the dimension of the screen) and then use the View port to scroll the content of the pixmap. Is there any simple way to do that? Any help or sample program will be appreciated! Thanks in advance. Yin
cjmchale@cs.tcd.ie (Ciaran McHale) (03/11/91)
In <1991Mar10.075412.11997@noose.ecn.purdue.edu> alien@piccolo.ecn.purdue.edu (Yin Chan) writes: > I am working on the Athena Widget set. I am supposed to draw some >things like circles, squares etc on a window. But since there are so many of >them that I want to put them in a sort of very large pixmap (bigger than the >dimension of the screen) and then use the View port to scroll the content of >the pixmap. Is there any simple way to do that? Any help or sample program >will be appreciated! Many servers will reject an attempt to create a pixmap which is larger than the root window. Even if the server allows you to create such a large pixmap, it would most likely eat up *lots* of memory. (For example, a 1024x1024x8 pixmap costs 1 megabyte.) But, if that's the way you want to do things ... Create a widget (as a child of the viewport) and set its background to be the pixmap. Whenever you draw into the pixmap, reset the background of the window to be the pixmap and call XClearWindow(). Ciaran. -- Ciaran McHale "Verbosity says it all" ____ Department of Computer Science, Trinity College, Dublin 2, Ireland. \ / Telephone: +353-1-772941 ext 1538 FAX: +353-1-772204 \/ Telex: 93782 TCD EI email: cjmchale@cs.tcd.ie