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              #cc
#info
  p Click to reposition your speck of matter.
  p Shift-click to place a fixed star.
  p Control-click to place a fixed star at a random position.
  p Alt-click or option-click to remove all fixed stars.
  p Press alt or option to stop your speck of matter.
            
          
!
            
              #cc
  max-width 1536px
  margin 0 auto
#info
  font-family Montserrat, sans-serif
  text-align center
            
          
!
            
              var w = 1536;
var h = 864;
var canvas;
var epoch = 0;
var centres = [];
var mass = 60;
var ball, vel;
var speed = .01;

function setup() {
  canvas = createCanvas(w,h);
  canvas.parent("cc");
  textFont("Montserrat");
  ellipseMode(CENTER);
  ball = createVector(w/2, h/2);
  vel = createVector(0, 0);
}

function draw() {
  background(0);
  switch (epoch) {
    case 0:
      noStroke();
      fill(255);
      textSize(72);
      textAlign(CENTER, CENTER);
      text("Click to continue", w/2, h/2);
      break;
    case 1:
      noStroke();
      fill(255);
      ellipse(ball.x, ball.y, mass, mass);
      let acc = createVector(0, 0);
      for (let i in centres) {
        let c = centres[i];
        stroke(255);
        noFill();
        ellipse(c.x, c.y, 2*mass, 2*mass);
        noStroke();
        fill(255);
        ellipse(c.x, c.y, mass, mass);
        let rv = p5.Vector.sub(c, ball);
        let rs = rv.mag()^2;
        rv.setMag(mass^2);
        acc.add(rv);
      }
      acc.mult(speed);
      vel.add(acc);
      ball.add(vel);
  }
}

function mouseClicked() {
  switch (epoch) {
    case 0:
      epoch = 1;
      break;
    case 1:
      if (keyIsDown(SHIFT)) {
        centres.push(createVector(mouseX, mouseY));
      } else if (keyIsDown(CONTROL)) {
        centres.push(createVector(Math.floor(Math.random()*w), Math.floor(Math.random()*h)))
      } else if (keyIsDown(ALT) || keyIsDown(OPTION)) {
        centres = [];
      } else {
        ball = createVector(mouseX, mouseY);
      }
      break;
  }
}

function keyPressed() {
  if (keyCode == ALT || keyCode == OPTION) {
    vel.mult(0);
  }
}
            
          
!
999px
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