#include <config.h>
#include <FL/Fl.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Hor_Slider.H>
#include <FL/math.h>

#include <FL/gl.h>
#include <FL/Fl_Gl_Window.H>

class shape_window : public Fl_Gl_Window {
  void draw() FL_OVERRIDE;
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;
  mode(FL_ALPHA);
}

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);
  glClearColor(.0f, .0f, .0f, .0);
  glColor3f(.5f, .6f, .7f);
  glBegin(GL_POLYGON);
  for (int j=0; j<sides; j++) {
    double ang = j*2*M_PI/sides;
    glVertex3f((GLfloat)cos(ang), (GLfloat)sin(ang), 0);
  }
  glEnd();
}

// 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);
  Fl_Box bg(FL_FLAT_BOX, 10, 10, 280, 280, 0);
  bg.color(FL_BLACK);
// 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();
}

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