cc3z+@andrew.cmu.edu (Christopher N. Carlson) (08/21/90)
Can anyone explain why the Draw app doesn't use the instance drawing mechanism? Is this purely for pedagogical reasons? Or is instance drawing somehow inappropriate in this context?
chavez@quorum.com (R. Martin Chavez) (08/22/90)
cc3z+@andrew.cmu.edu (Christopher N. Carlson) writes: >Can anyone explain why the Draw app doesn't use the instance drawing >mechanism? Is this purely for pedagogical reasons? Or is instance >drawing somehow inappropriate in this context? Instance drawing, though extremely fast, leaves a noticeable flicker on the screen (even with buffered windows). The compositing algorihm used by the Draw app provides for a much smoother rubberbanding effect. TopDraw employs a similar mechanism. In general, I'd recommend that you break out the Draw app's compositing and offscreen-window code for most rubberbanding applications. R. Martin Chavez Quorum Software Systems, Inc.