//*************************** File main.c ****************************

#include <stdio.h>
#include "../opsys.h"
#include "../Xglib/xglib.h"
#include "../Shape2d/application.h"
#include "../Shape2d/win_view.h"
#include "../Shape2d/mouse.h"
#include "../Shape2d/circle.h"

int wrap(int x, int len)
{
  x = x % len;
  if (x < 0) x += len;
  return x;
}

void setpix_wrap(int x, int y)
{
  // setpix but with wraparound

  x = wrap(x, DWID);
  y = wrap(y, DHEI);
  setpix(x, y);
}

void setpix_octs(int x, int y, point_t & cen)
{
  int cenx = int(cen.givx());
  int ceny = int(cen.givy());

  setpix_wrap( x+cenx, y+ceny);   // four quadrants
  setpix_wrap( x+cenx,-y+ceny);
  setpix_wrap(-x+cenx, y+ceny);
  setpix_wrap(-x+cenx,-y+ceny);
  setpix_wrap( y+cenx, x+ceny);   // four quadrants, x and y interchanged
  setpix_wrap( y+cenx,-x+ceny);
  setpix_wrap(-y+cenx, x+ceny);
  setpix_wrap(-y+cenx,-x+ceny);
}

void bresenham(circle_t& c, application_t & ap)
{  
  // get center and radius in world coordinates
  point_t center = c.givcen();
  double radius = c.givr();
  point_t top = center + point_t(0.0,radius);

  // convert to screen coordinates
  ap.wv.win_dev(center);
  ap.wv.win_dev(top);
  int r = int(center.givy() - top.givy());

  // draw the circle
  int x = 0;
  int y = r;
  int s = 3 - 2*r;
  while ( x <= y) {
    setpix_octs(x, y, center);
    x++;
    if (s <= 0) {
      s += 4*x + 6;
    }
    else {
      y--;
      s += 4*(x - y) + 10;
    }
  }
}

void main()
{
   // create an "application".  This will create the X window and initialize two colors
   // with color map locations 0 (background color) and 1 (foreground color).  
   application_t ap;
   scene_t s(&(ap.wv));

   // create a "mouse"
   mouse_t mouse(ap.wv) ;

   // set color entry 2 to red
   setlook(255,0,0,2);


   for (int i=0; i<20; i++) {
     circle_t  c(mouse);              // create a line (uses mouse clicks)
     bresenham(c,ap);               // draw it
     mouse.wait_button_click();     // wait for mouse click
     col(2);			    // change color 
     c.draw(&s);		    // draw circle using library routine
     col(1);			    // set color back to cyan
     mouse.wait_button_click();     // wait for mouse click
     setfr(0);                      // clear screen
   }


}

/********************************************************************/