matthiasm schrieb:
>
> On Mar 17, 2007, at 11:54 PM, Maximilian Matthé wrote:
>
>> In my program i have a while-loop where I change the content of an own
>> widget. I want to redraw the widget after every change of its content:
>
> Call Fl::flush() after redraw().
>
> Note however that this will slow down your loop considerably. Screen
> drawing is expensive. Depending what your loop does, it is usually
> better to do those calculations in a separate thread and use the
> Fl::awake() mechanism, or use a timer to slice very long operations into
> shorter execution units, preferably around 10ms... .
>
> Matthias
>
> ----
> http://robowerk.com/
>
>
Calling fltk::flush() works fine. Almost :) Maybe its a feature, but:
fltk::flush() changes the current transformation. I have to enclose
fltk::flush in to push_matrix and pop_matrix. Is this usual?
I'm drawing into the widget I want to be redrawn with redraw:
while(i <= 1.0f)
{
sVector p = pos + dir * i;
sLine l = BuildLine(p-orth, p+orth);
fltk::push_matrix(); // flush must be enclosed to store the current
matrix?
redraw();
fltk::flush();
fltk::pop_matrix();
fltk::setcolor(fltk::BLACK);
fltk::drawline(l.Start.x, l.Start.y, l.End.x, l.End.y);
fltk::setcolor(fltk::RED);
for(int c = 0; c < hits.size(); c++)
{
const sPoint& p = m_Corns[hits[c]];
if(PointLineCoords(p, l) > 0)
DrawCorn(p);
}
i += step;
}
My Widget::draw() restores the current transformation:
void cDrawField::draw()
{
fltk::push_matrix();
SetMatrix();
// ...
fltk::pop_matrix();
}
So is this a bug or is it a feature?
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