Re: "Animation" problems

["Felix E. Klee" <felix klee inka de>]

"Felix E. Klee" wrote:
> Here is the code that I use for the updates (its in gtk-- but should be
> readable for everyone who knows gtk+):
>
>     rect.x = 0; rect.y = 0; rect.width = 640; rect.height = 480;
>     Gdk_GC gc = drawingArea->get_style()->get_white_gc();
>     pixmap->draw_rectangle(gc, true, rect.x, rect.x, rect.width,
> rect.height);
>     gc = drawingArea->get_style()->get_black_gc();
>     for (int i = 1; i <= N; ++i)
>         pixmap->draw_line(gc, 320 + (int)(x[i-1] * 10.), (i-1) * 640 / N,
>                           320 + (int)(x[i] * 10.), i * 640 / N);
>     win->draw_pixmap(gc, *pixmap, 0, 0,
>                      rect.x, rect.y, rect.width, rect.height);
>     drawingArea->draw(&rect);
>
> Am I doing something wrong or is this problem unavoidable?

I removed the line
    win->draw_pixmap(gc, *pixmap, 0, 0,
                     rect.x, rect.y, rect.width, rect.height);
because draw_pixmap is also called in drawingarea->on_expose_event(...)
which seems to be triggered by drawingArea->draw(). Now, the "animation"
looks much better. Perhaps that finally solved the problem.

TIA,

Felix