// // "$Id: gl_overlay.cxx,v 1.4.2.3.2.1 2002/01/01 15:11:33 easysw Exp $" // // OpenGL overlay test program for the Fast Light Tool Kit (FLTK). // // Copyright 1998-2002 by Bill Spitzak and others. // // This library is free software; you can redistribute it and/or // modify it under the terms of the GNU Library General Public // License as published by the Free Software Foundation; either // version 2 of the License, or (at your option) any later version. // // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // Library General Public License for more details. // // You should have received a copy of the GNU Library General Public // License along with this library; if not, write to the Free Software // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 // USA. // // Please report all bugs and problems to "fltk-bugs@fltk.org". // #include #include #include #include #include #include #if !HAVE_GL #include class shape_window : public Fl_Box { public: int sides; shape_window(int x,int y,int w,int h,const char *l=0) :Fl_Box(FL_DOWN_BOX,x,y,w,h,l){ label("This demo does\nnot work without GL"); } }; #else #include #include class shape_window : public Fl_Gl_Window { void draw(); void draw_overlay(); public: 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; } 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; isides = int(((Fl_Slider *)o)->value()); sw->redraw(); } #if HAVE_GL void overlay_sides_cb(Fl_Widget *o, void *p) { shape_window *sw = (shape_window *)p; sw->overlay_sides = int(((Fl_Slider *)o)->value()); sw->redraw_overlay(); } #endif #include int main(int argc, char **argv) { Fl_Window window(300, 370); shape_window sw(10, 75, window.w()-20, window.h()-90); //sw.mode(FL_RGB); window.resizable(&sw); Fl_Hor_Slider slider(60, 5, window.w()-70, 30, "Sides:"); slider.align(FL_ALIGN_LEFT); slider.callback(sides_cb,&sw); slider.value(sw.sides); slider.step(1); slider.bounds(3,40); Fl_Hor_Slider oslider(60, 40, window.w()-70, 30, "Overlay:"); oslider.align(FL_ALIGN_LEFT); #if HAVE_GL oslider.callback(overlay_sides_cb,&sw); oslider.value(sw.overlay_sides); #endif oslider.step(1); oslider.bounds(3,40); window.end(); window.show(argc,argv); #if HAVE_GL printf("Can do overlay = %d\n", sw.can_do_overlay()); sw.show(); sw.redraw_overlay(); #else sw.show(); #endif return Fl::run(); } // // End of "$Id: gl_overlay.cxx,v 1.4.2.3.2.1 2002/01/01 15:11:33 easysw Exp $". //