gistfile1.txt

void setup() {
   size(512,512);
   background(0);
   noStroke();
}

int mojim[][][] = {
    {{50, 450}, {50, 50}},
    {{50, 50}, {250, 200}},
    {{250, 200}, {450, 50}},
    {{450, 50}, {450, 450}}
  };
  
void draw(){
  //int x[] = {400, 320, 180, 100, 100, 180, 320, 400};
  //int y[] = {320, 400, 400, 320, 180, 100, 100, 180};
  //int i;
  //for(i=0;i<8;i++){
  // Bresen(250, 250, x[i], y[i]);
  //}

  //Bresen(10,250, 510, 350);
  //Bresen(10,250, 510, 150);


  //Bresen(510,250, 10, 450);
  //Bresen(510,250, 10, 50);
  
  polygonmode(mojim, 4);


}

void polygonmode(int p[][][], int num){
  for(int i =0;i<num;i++){
    Bresen(p[i][0][0], p[i][0][1], p[i][1][0], p[i][1][1]);
  }
}

void Bresen(int xs,int ys, int xe, int ye)
{
int w, er, x, y;
if(abs(xe - xs) > abs(ye - ys)) {
      if(xs>xe) {
          w=xs;xs=xe;xe=w;
          w=ys;ys=ye;ye=w;
        }
      y=ys; er=(xe-xs);
      for( x=xs ; x<=xe ; x++) {
      v_pixel(1,x,y,255,255,255);
      er=er+abs(ye-ys)*2;
      if( er >=(xe-xs)*2) {
        if(ys < ye) {
          y = y+1; 
        }else {
          y = y-1;
        }
        er = er-(xe-xs)*2;      
      }
  }
}else{
      if(ys>ye) {
        w=ys;ys=ye;ye=w;
        w=xs;xs=xe;xe=w;
      }
      y=ys; er=(ye-ys);
      x = xs; er = 0;
      for(y=ys;y<=ye;y++){
      v_pixel(1,x,y,255,255,255);
      er=er+abs(xe-xs)*2;
      if( er >=(ye-ys)*2) {
        if(xs < xe) {
          x = x+1; 
        }else {
          x = x-1;
        }
        er = er-(ye-ys)*2;      
      }
      }
}
}



// Do not Delete folowing function

void keyPressed(){
  if( key== 's' ) {
    saveFrame("Result.jpg");  // Save File Name
  }
}

//
// Don't rewrite following function v_pixel !!
//

void v_pixel(int n, int x, int y, int r,int g, int b)
  {
   if(n==1)
      {stroke(color(r,g,b));
      point(x,y);}
    else
     {fill(r,g,b);
       rect(x*n,y*n,n,n);}
  }