Hi!
Oh I didn't know that drawing outside Widget::draw() is not supported.
OK, here is what I want to achieve with this:
I want to make a simple animation when I click on a Button.
// Callback of the Button:
void WndMain::cbVisualRun(fltk::Widget* w)
{
//...
int hits = m_Field->VisualizeHits(animsize, y1, y2);
// ...
}
m_Fields is a pointer to my subclass of fltk::Widget. (cDrawField)
The class represents an area with points laying on it.
cDrawfield::draw() first calls fltk::Widget::draw() to clear the
background and show the box around and then draws a lot of circles into
the widget. Every "frame" in the animation has this background. The
animation should (firstly) be a simple line that runs from one point in
the widget to another point. When the line reaches the end point it
should stop.
Possibly this animation seems to be a bit stupid, actually it is a bit
more complicated but that does not change the problem so I tried to keep
it as simple as possible.
I thought using draw() to draw the backgound of the widget and the line
in front in the VisualizeHits function would be a good idea, but it
seems not to :)
// function that displays the animation
int cDrawField::VisualizeHits(float Width, float yBegin, float yEnd)
{
// ...
fltk::push_matrix();
SetMatrix();
// ...
float i = 0;
while(i <= 1.0f)
{
sVector p = pos + dir * i;
sLine l = BuildLine(p-orth, p+orth);
fltk::push_matrix();
// Draw background
redraw();
fltk::flush();
fltk::pop_matrix();
// Draw the animated line
fltk::setcolor(fltk::BLACK);
fltk::drawline(l.Start.x, l.Start.y, l.End.x, l.End.y);
i += step;
}
fltk::pop_matrix();
return hits.size();
}
In general, I do not really know, how to make a simple animation. Of
course I should add time measurement so that it runs on same speed on
all pcs.
But the prog freezes as long as the animation runs (I could undo this
with fltk::check() or sth).
So how should one do a simple animation in fltk? possibly I could also
use OpenGL to disply it, but that seems a bit overkill to me for this
simple 2D-animation :)
Or would it be a good idea not to have a loop but a fltk::add_timeout
and fltk::repeat_timeout for simple animations?
Hm, much text, I hope you can help me nethertheless :)
Greetings, Maxi
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