#include <stdio.h>
#include <math.h>

#include "mygraph.h"
#include "point.h"
#include "Xroutines.h"

#  define M_PI              3.14159265358979323846

dc_draw_line ( line aline, environment * env) {
    DrawLine(aline.e1.x, aline.e1.y,aline.e2.x, aline.e2.y, env);
}

draw_circle(environment * env) {

      int x, y, xc,yc,r;

      r = 170;
      xc = 200; yc = 200;
      for (x=xc-r;x<=xc+r;x++){
	  y = yc - sqrt((float) (r*r-(x-xc)*(x-xc)));
	  SetPixel(env,x,y);
	  y = yc + sqrt((float) (r*r-(x-xc)*(x-xc)));
	  SetPixel(env,x,y);
      }
}

draw_circle2(environment * env) {
     int x, y, r, xc,yc;
     float theta, thetadelta;

     r = 180;
     thetadelta = 1.0 / (float) r;
     xc = 200; yc = 200;
     for(theta=0;theta<360;theta+=thetadelta) {
	 x = r*cos(theta*M_PI/180.0);
	 y = r*sin(theta*M_PI/180.0);
         SetPixel(env,xc+x,yc+y);
     }
}

draw_circle3(environment * env) {
     int x, y, r, xc,yc;
     int p;

     r = 190;
     xc = 200; yc = 200;

     y = r;
     p = 3-2*r;
     for(x=0;x<=y;x++) {
          SetPixel(env,xc+x,yc+y);
          SetPixel(env,xc-x,yc+y);
          SetPixel(env,xc+x,yc-y);
          SetPixel(env,xc-x,yc-y);
          SetPixel(env,xc+y,yc+x);
          SetPixel(env,xc-y,yc+x);
          SetPixel(env,xc+y,yc-x);
          SetPixel(env,xc-y,yc-x);

	  if (p < 0) {
	     p += 4*x+6;
	  } else {
	     p += 4*(x-y)+10;
	     y -= 1;
	  }
     }
}

draw_circle4(environment * env) {
     int x, y, r, xc,yc;
     int p;

     r = 195;
     xc = 200; yc = 200;

     p = 1-r;
     x=0;
     y = r;
     for(x=0;x<=y;) {
          SetPixel(env,xc+x,yc+y);
          SetPixel(env,xc-x,yc+y);
          SetPixel(env,xc+x,yc-y);
          SetPixel(env,xc-x,yc-y);
          SetPixel(env,xc+y,yc+x);
          SetPixel(env,xc-y,yc+x);
          SetPixel(env,xc+y,yc-x);
          SetPixel(env,xc-y,yc-x);
         
	  x++;
	  if (p > 0) {
	     y--;
             p += 2*(x-y)+1;
	  } else {
	     p +=2*x+1;
	  }
     }
}