iron sand

let tileCountX;

let tileCountY;

let tileWidth;

let actStrokeCap;

let actTileCount;

let actAngle;

​

function setup(){

  createCanvas(windowHeight, windowHeight);

  colorMode(HSB,360,100,100);

  background(100);

  actTileCount = 20;

  strokeWeight(10);

  actStrokeCap = PROJECT;

  actAngle = 0;

}

​

function draw() {

  strokeCap(actStrokeCap);

  background(100);

  tileCount = actTileCount;

  tileWidth = width/tileCount;

  for(let i = 0; i < tileCount; i++){

    for(let k = 0; k < tileCount; k++){

      let posX = i*tileWidth;

      let posY = k*tileWidth;

      let oX = posX + tileWidth/2;

      let oY = posY + tileWidth/2;

      let angle = atan((mouseY-oY)/(mouseX-oX)) + actAngle;

      push();

      translate(oX,oY);

      rotate(angle);

      line(-tileWidth/2,0,tileWidth/2,0);

      pop();

    }

  }

}

​

function keyReleased() {

  if(key == '1') actStrokeCap = ROUND;

  if(key == '2') actStrokeCap = SQUARE;

  if(key == '3') actStrokeCap = PROJECT;

  if(keyCode == UP_ARROW) actAngle += PI/18;

  if(keyCode == DOWN_ARROW) actAngle -= PI/18;

}