flag

let angle;

let mask;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  angle =  PI/4;

  let r = min(windowWidth/2, windowHeight/2);

  fullscreen();

  mask = createGraphics(windowWidth, windowHeight);

  mask.background(255);

  // mask.ellipse(windowWidth/2, windowHeight/2, r, r);

  mask.drawHexa = function(x,y,r){

    mask.fill(0);

    mask.noStroke();

    mask.beginShape();

    for (let a = 0; a < TWO_PI; a += TWO_PI / 6) {

      let sx = x + cos(a) * r;

      let sy = y + sin(a) * r;

      mask.vertex(sx, sy);

    }

    mask.endShape(CLOSE);

    mask.noFill();

    mask.stroke(0);

    mask.beginShape();

    for (let a = 0; a < TWO_PI; a += TWO_PI / 6) {

      let sx = x + cos(a) * r * 1.1;

      let sy = y + sin(a) * r * 1.1;

      mask.vertex(sx, sy);

    }

    mask.endShape(CLOSE);

  }

  for (let a = 0; a < 3; a ++) {

    let sx = windowWidth/4*a+windowWidth/4;

    let sy = windowHeight/2;

    mask.drawHexa(sx,sy,r/(1+abs(1-a))/2);

  }

  mask.loadPixels();

  for (let i = 0; i < mask.pixels.length; i += 4) {

    // set alpha channel to blue level

    mask.pixels[i + 3] = mask.pixels[i]; 

    // set pixel color to black

    mask.pixels[i] = 0;

    mask.pixels[i + 1] = 0;

    mask.pixels[i + 2] = 0;   

  }

  mask.updatePixels();

  // mask.filter(BLUR, 3);

}

​

function draw() {

  background(0);

  let n = noise(frameCount/10);

  let intensity = n+.1;

  strokeWeight(intensity);

  // stroke(210, 70, 50, 60*(1+intensity));

  stroke(255, 60*(1+intensity));

  let lines= 500;

  let xStep = width/lines;

  for(let i=1;i<lines;i++){

    x=i*xStep;

    angle = map(noise((frameCount+i/500)),0,1,-PI/4,PI/4);

    push();

    translate(x,2*height);

    branch(height, angle);

    pop();  

​

    push();

    translate(x, -height);

    branch(-height, angle);

    pop();  

​

  }

  image(mask,0,0);

}

​

function branch(l,a){

  if(abs(l) < 4) return;

  line(0,0,0,-l);

  translate(0,-l);

  push();

  rotate(a);  

  branch(l*.45, a);

  pop();

}