ref: 2c23de27d5006e969106fad672399fafe6464845
dir: /DoConfig/fltk/test/shape.cxx/
// // "$Id$" // // Tiny OpenGL demo program for the Fast Light Tool Kit (FLTK). // // Copyright 1998-2010 by Bill Spitzak and others. // // This library is free software. Distribution and use rights are outlined in // the file "COPYING" which should have been included with this file. If this // file is missing or damaged, see the license at: // // http://www.fltk.org/COPYING.php // // Please report all bugs and problems on the following page: // // http://www.fltk.org/str.php // #include <config.h> #include <FL/Fl.H> #include <FL/Fl_Window.H> #include <FL/Fl_Hor_Slider.H> #include <FL/math.h> #if HAVE_GL #include <FL/gl.h> #include <FL/Fl_Gl_Window.H> class shape_window : public Fl_Gl_Window { void draw(); public: int 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 = 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, pixel_w(), pixel_h()); } // draw an amazing graphic: glClear(GL_COLOR_BUFFER_BIT); glColor3f(.5,.6,.7); glBegin(GL_POLYGON); for (int j=0; j<sides; j++) { double ang = j*2*M_PI/sides; glVertex3f(cos(ang),sin(ang),0); } glEnd(); } #else #include <FL/Fl_Box.H> 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"); } }; #endif // when you change the data, as in this callback, you must call redraw(): void sides_cb(Fl_Widget *o, void *p) { shape_window *sw = (shape_window *)p; sw->sides = int(((Fl_Slider *)o)->value()); sw->redraw(); } int main(int argc, char **argv) { Fl::use_high_res_GL(1); Fl_Window window(300, 330); // the shape window could be it's own window, but here we make it // a child window: shape_window sw(10, 10, 280, 280); // make it resize: window.resizable(&sw); // window.size_range(300,330,0,0,1,1,1); // add a knob to control it: Fl_Hor_Slider slider(50, 295, window.w()-60, 30, "Sides:"); slider.align(FL_ALIGN_LEFT); slider.callback(sides_cb,&sw); slider.value(sw.sides); slider.step(1); slider.bounds(3,40); window.end(); window.show(argc,argv); return Fl::run(); } // // End of "$Id$". //