​

let canvasWidth = 800;

let canvasHeight = 800;

//let left_x = canvasWidth * -0.5;

//let right_x = canvasWidth * 1.5;

//let top_y = canvasHeight * -0.5;

//let bottom_y = canvasHeight * 1.5;

//let resolution = canvasWidth * 0.01;

//let num_cols = (right_x - left_x) / resolution;

//let num_rows = (bottom_y - top_y) / resolution;

let num_cols = 80;

let num_rows = 80;

let grid = [];

​

function setup() {

  // setup canvas

  createCanvas(canvasWidth, canvasHeight);

​

  // initialize grid

  for (let row = 0; row <= num_rows; row++) {

    grid.push([]);

    for (let col = 0; col <= num_cols; col++) {

      let angle = (row / float(num_rows)) * PI;

      grid[row].push(angle);

    }

  }

}

​

// draw lines

function draw() {

  background(150);

  strokeWeight(2);

  for (let row = 0; row <= num_rows; row++) {

    for (let col = 0; col <= num_cols; col++) {

      let gap = 20;

      let length = 28;

      line(

        row * gap, 

        col * gap, 

        row * gap + cos(grid[col][row]) * length, 

        col * gap + sin(grid[col][row]) * length

      );

      grid[row][col] += 0.1;

    }

  }

}

​