void grid1(){
  float h=10, d=7;
  fill(220); stroke(220); strokeWeight(1);
  line(bigX+C[0],bigY+R[0],bigX+C[4],bigY+R[0]);
  line(bigX+C[0],bigY+R[1],bigX+C[4]+h,bigY+R[1]);
  line(bigX+C[0],bigY+R[2],bigX+C[4]+h,bigY+R[2]);
  line(bigX+C[0],bigY+R[3],bigX+C[4]+h,bigY+R[3]); 
  line(bigX+C[0],bigY+R[4],bigX+C[4]+h,bigY+R[4]);
  line(bigX+C[0],bigY+R[0],bigX+C[0]  ,bigY+R[4]);
  line(bigX+C[1],bigY+R[0],bigX+C[1]  ,bigY+R[4]+h);
  line(bigX+C[2],bigY+R[0],bigX+C[2]  ,bigY+R[4]+h);
  line(bigX+C[3],bigY+R[0],bigX+C[3]  ,bigY+R[4]+h);
  line(bigX+C[4],bigY+R[0],bigX+C[4]  ,bigY+R[4]+h);
  //
  ellipse(bigX+C[4]+h,bigY+R[1]  ,d,d);
  ellipse(bigX+C[4]+h,bigY+R[2]  ,d,d);
  ellipse(bigX+C[4]+h,bigY+R[3]  ,d,d);
  ellipse(bigX+C[4]+h,bigY+R[4]  ,d,d);
  ellipse(bigX+C[1]  ,bigY+R[4]+h,d,d);
  ellipse(bigX+C[2]  ,bigY+R[4]+h,d,d);
  ellipse(bigX+C[3]  ,bigY+R[4]+h,d,d);
  ellipse(bigX+C[4]  ,bigY+R[4]+h,d,d);
}

void grid2(){
  strokeCap(SQUARE); stroke(220); strokeWeight(1);
  line(0,50,250,50);
  line(0,100,250,100);
  line(0,150,250,150);
  line(0,200,250,200);
  //
  line(0,300,250,300);
  line(0,350,250,350);
  line(0,400,250,400);
  line(0,450,250,450);
  line(0,500,250,500);
  line(0,550,250,550);
  line(0,600,250,600);
  //
  line(50,0,50,650);
  line(100,0,100,650);
  line(150,0,150,650);
  line(200,0,200,650);
  //
  strokeWeight(2);
  line(0,250,250,250);
  line(250,0,250,650);
}

void grid3(){
  float  []  Cref={-20, -10, 0, 10, 20}, Rref={-20, -10, 0, 10, 20};
  float x,y;
  strokeCap(SQUARE); stroke(220); strokeWeight(1); fill(220);
  rect(435,500,130,50);
  strokeCap(SQUARE); stroke(255); strokeWeight(1); fill(255);
  x=460; y=525;
  line(x+c[0],y+r[0],x+c[4],y+r[0]);
  line(x+c[0],y+r[1],x+c[4],y+r[1]);
  line(x+c[0],y+r[2],x+c[4],y+r[2]);
  line(x+c[0],y+r[3],x+c[4],y+r[3]); 
  line(x+c[0],y+r[4],x+c[4],y+r[4]);
  line(x+c[0],y+r[0],x+c[0],y+r[4]);
  line(x+c[1],y+r[0],x+c[1],y+r[4]);
  line(x+c[2],y+r[0],x+c[2],y+r[4]);
  line(x+c[3],y+r[0],x+c[3],y+r[4]);
  line(x+c[4],y+r[0],x+c[4],y+r[4]);
  x=540; y=525;
  line(x+Cref[0],y+Rref[0],x+Cref[4],y+Rref[0]);
  line(x+Cref[0],y+Rref[1],x+Cref[4],y+Rref[1]);
  line(x+Cref[0],y+Rref[2],x+Cref[4],y+Rref[2]);
  line(x+Cref[0],y+Rref[3],x+Cref[4],y+Rref[3]); 
  line(x+Cref[0],y+Rref[4],x+Cref[4],y+Rref[4]);
  line(x+Cref[0],y+Rref[0],x+Cref[0],y+Rref[4]);
  line(x+Cref[1],y+Rref[0],x+Cref[1],y+Rref[4]);
  line(x+Cref[2],y+Rref[0],x+Cref[2],y+Rref[4]);
  line(x+Cref[3],y+Rref[0],x+Cref[3],y+Rref[4]);
  line(x+Cref[4],y+Rref[0],x+Cref[4],y+Rref[4]);
  strokeWeight(3); fill(255);
  line(485,525,506,525);
  fill(255);smooth();strokeWeight(1);
  triangle(505,521,505,529,515,525);
  noSmooth();
}