#ifndef __stair
#define __start
#include <cmath>

class Stair{
 public:
  Stair(double,double,int,int,int,int,double);
  void draw(void);
  double getAngle(void);
  void setAngle(double);
 private:
  int    startx;       // where we begin
  int    starty;       // where we begin, we rotate around this axis
  int    startz;       // where we begin
  int    numsteps;
  double radius;
  double height;
  double angle;
  double rot;
};

Stair::Stair(double radius, double height,
	     int startx, int starty,int  startz,
	     int numsteps,double angle){
  this->radius  = radius;
  this->height  = height;
  this->startx  = startx;
  this->starty  = starty;
  this->startz  = startz;
  this->numsteps= numsteps;
  this->angle   = angle; 
  this->rot     = 0;

}


///////////////////////
// Stair::draw
void Stair::draw(void){
  double ypos = starty;
  double ang  = 0;

  glRotatef(rot,0,1,0);
  glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
  glBegin(GL_QUAD_STRIP);

  // draw the first line
  glVertex3f(startx,ypos,startz);
  glVertex3f(radius*sin(ang*M_PI/180.0),ypos,radius*cos(ang*M_PI/180.0));
  
  for(int i=0;i<numsteps;i++){
    // increment ypos
    ypos+=height;
    // draw the horizontal triangle
    glVertex3f(startx,ypos,startz);
    glVertex3f(radius*sin(ang*M_PI/180.0),ypos,radius*cos(ang*M_PI/180.0));
    ang += angle;
    while(ang>360.0) ang-=360.0;
     glVertex3f(startx,ypos,startz);
    glVertex3f(radius*sin(ang*M_PI/180.0),ypos,radius*cos(ang*M_PI/180.0));

  }

  glEnd();
}


/////////////////////////////
// Stair::getAngle
double Stair::getAngle(void){
  return rot;
}

/////////////////////////////////
// Stair::setAngle
void Stair::setAngle(double rot){
  this->rot=rot;
}

#endif