Re: drawing moving shapes

[Michael Ekstrand <mekstran scl ameslab gov>]

On Fri, 2007-02-02 at 12:20 -0700, Rob Barnes wrote:
> I'm trying to write a simple program that draws a moving polygon on the
> screen. I started with the scribble-simple example and modified to draw the
> moving shape by redrawing the shape in the background color in the previous
> position first then drawing it in the foreground color in the current
> position. It works fine, except it only refreshes when something happens
> such as mouse movement, click, expose, window adjustment. So to keep things
> moving I have to keep moving the mouse around, but it stops if the mouse
> stops, even though the polygon is being redrawn contently.

Make sure you request a redraw every time the underlying state changes -
check out gtk_widget_queue_draw.

-- 
Michael Ekstrand
Research Assistant, Scalable Computing Laboratory
Goanna, compute cluster and InfiniBand network monitor tool:
        http://www.scl.ameslab.gov/Projects/Monitor/