>From the documentation:
"You cannot use Fl_Window as a child of this since the clipping is not conveyed
to it when drawn, and it will draw over the scrollbars and neighboring objects."
If you want to make this work, then I think you will need to write a class
specifically for scrolling a gl_window, which repositions and resizes the
gl_window within the appropriate area of the scroll, while maintaining proper
virtual coordinates. It would take a fair bit of hacking.
Otherwise, you could search the forum to see if someone has already done this.
Don.
> I met a problem with Fl_Gl_window and Fl_Scroll.
>
> My purpose is to display animation by Fl_Gl_window. And when window shrink
> and smaller than the animation size,scroolbar show up.
>
> But when window shrink ,Fl_Gl_window will overlap with Fl_Scroll. In
> result,Fl_Scroll can't be able to seen.
>
> Anyone met same problem before. Any suggestion also welcomed.
>
> Thanks first,
>
> Jack
> //////////////////////////////////
> #include "config.h"
> #include <FL/Fl.H>
> #include <FL/Fl_Window.H>
> #include <FL/Fl_Hor_Slider.H>
> #include <FL/Fl_Toggle_Button.H>
> #include <FL/math.h>
> #include <stdio.h>
> #include <FL/gl.h>
> #include <FL/Fl_Gl_Window.H>
>
> class shape_window : public Fl_Gl_Window {
> void draw();
> void draw_overlay();
> public:
> char* m_pFrameData;
> int sides;
> int overlay_sides;
> shape_window(int x,int y,int w,int h,const char *l=0);
> };
>
> shape_window::shape_window(int x,int y,int w,int h,const char *l) :
> Fl_Gl_Window(x,y,w,h,l) {
> sides = overlay_sides = 3;
> m_pFrameData=new char[w*h*40];
> }
>
> void shape_window::draw() {
> // the valid() property may be used to avoid reinitializing your
> // GL transformation for each redraw:
> if (!valid()) {
> valid(1);
> glLoadIdentity();
> glViewport(0,0,w(),h());
> }
> // draw an amazing but slow graphic:
> glClear(GL_COLOR_BUFFER_BIT);
> // for (int j=1; j<=1000; j++) {
> glBegin(GL_POLYGON);
> for (int i=0; i<sides; i++) {
> double ang = i*2*M_PI/sides;
> glColor3f(float(i)/sides,float(i)/sides,float(i)/sides);
> glVertex3f(cos(ang),sin(ang),0);
> }
> glEnd();
>
> static int cc=0;
> printf("w=%u:h=%u\n",w(),h());
> memset(m_pFrameData,cc++,w()*h()*3);
> glDrawPixels(w(),h(),GL_BGR_EXT,GL_UNSIGNED_BYTE,m_pFrameData);
> if(cc>255)
> cc=0;
> // }
> }
>
> void shape_window::draw_overlay() {
> // the valid() property may be used to avoid reinitializing your
> // GL transformation for each redraw:
> if (!valid()) {
> valid(1);
> glLoadIdentity();
> glViewport(0,0,w(),h());
> }
>
> static int cc=0;
> memset(m_pFrameData,cc++,w()*h()*3);
> glDrawPixels(w(),h(),GL_BGR_EXT,GL_UNSIGNED_BYTE,m_pFrameData);
> if(cc>255)
> cc=0;
> }
>
> #include <stdio.h>
> #include <Fl/Fl_Scroll.h>
> int main(int argc, char **argv) {
>
> Fl_Window window(300, 370);
> Fl_Scroll src(0,0,300,370);
> shape_window sw(0, 0, 300-20, 370-20);
> window.resizable(&sw);
> window.show(argc,argv);
> return Fl::run();
> }
>
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