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I wouldn't derive from Fl_Window, as that implies your
coordinate space origin gets reset to zero. Changed that
to Fl_Group.
Also, fixed your yellow borders a bit; your code wasn't
consistent with the +1/-1 offsets to keep the border onscreen.
Revised code; see CHANGED lines:
---------------------------------------------------------------------------
/**
Test by Robert Strickland to tile four OpenGL windows.
Based on Erco's cheat:
http://seriss.com/people/erco/fltk/#GL4PortResizable
but without the code to do the proportional resizing
*/
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Tile.H>
#include <FL/Fl_Gl_Window.H>
#include <FL/gl.h>
/**
A Fl_Gl_Window that draws an X in a box
*/
class FLGL : public Fl_Gl_Window {
public:
FLGL(int x, int y, int w, int h, const char* l=0) :
Fl_Gl_Window(x, y, w, h, l) {
end();
}
protected:
void draw() {
if ( !valid() ) {
// First time? init viewport, etc.
valid(1);
glLoadIdentity();
glViewport(0, 0, w(), h());
glOrtho(-w(), w(), -h(), h(), -1, 1);
}
// Clear screen
glClear(GL_COLOR_BUFFER_BIT);
// Draw white 'X'
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_LINES);
glVertex2f( w(), h());
glVertex2f(-w(), -h());
glVertex2f( w(), -h());
glVertex2f(-w(), h());
glEnd();
// Draw yellow border last, around the outer edge
glColor3f(1.0, 1.0, 0.0);
glBegin(GL_LINE_LOOP);
glVertex2f(-w()+1, -h()+1); // CHANGED
glVertex2f( w()-1, -h()+1); // CHANGED
glVertex2f( w()-1, h()-1); // CHANGED
glVertex2f(-w()+1, h()-1); // CHANGED
glEnd();
}
};
/**
A container for a FLGL window that leaves room for a border
*/
class Viewport : public Fl_Group { // CHANGED: Window -> Group
protected:
FLGL *gl;
public:
Viewport(int x, int y, int w, int h, const char* l=0) :
Fl_Group(x, y, w, h, l) { // CHANGED: Window -> Group
box(FL_DOWN_FRAME);
gl = new FLGL( x+10, y+10, w-20, h-20 ); // CHANGED: x,y,w,h
resizable(gl);
end();
}
};
/**
A 2x2 tile of OpenGL windows in Viewport containers with borders
*/
class Layout:public Fl_Tile {
private:
Viewport *view[4];
public:
Layout(int x, int y, int w, int h) : Fl_Tile(x, y, w, h) {
box(FL_DOWN_BOX);
color(FL_RED); // (shouldn't be seen)
// Create the 4 Viewports
int k = 0;
for (int j = 0; j < 2; j++) {
for (int i = 0; i < 2; i++) {
view[k] = new Viewport(i*200, j*200, 200, 200);
view[k]->box(FL_DOWN_BOX);
view[k]->color(9+k);
view[k]->align(FL_ALIGN_CLIP);
k++;
}
}
end();
}
};
int main() {
Fl_Double_Window *win = new Fl_Double_Window(400, 400, "gltileb");
Layout *layout = new Layout(0, 0, win->w(), win->h());
win->resizable(layout);
win->end();
win->show();
return(Fl::run());
}
// End of test code
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