e4494s.github.io/circles.html at master · e4494s/e4494s.github.io · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <link rel = 'icon'  href = 'https://e4494s.neocities.org/images/favicon.png' type = 'image/png'/>
    <title>Circles ~ e4494s</title>
    <style>
      canvas {
        width: 100%;
        height: 100%;
        bottom: 0;
        left: 0;
        position: absolute;
        background-color: black;
      }

      body {
        user-select: none;
        font-size: 13px;
        margin: 0;
      }

      table, tr, td, th {
        border: 1px solid black;
      }

      input[type=radio] {
        cursor: pointer;
        width: 10px;
        height: 10px;
      }

      input:focus, button:focus {
        outline: none;
      }

      button {
        cursor: pointer;
      }

      label {
        cursor: pointer;
      }

      #ballstxt {
        font-weight: bold;
        font-size: 20px;
      }

      .accentimg {
        background-color: black;
        border-radius: 5px;
        border: 2px solid black;
        max-width: 25px;
        max-height: 25px;
        cursor: pointer;
      }
    </style>
  </head>
<body>
<table id = 'menus'>
  <tr>
    <td rowspan = '3' style = 'max-width: 250px'>
      <div><b><u>Mode</u></b></div>
      <input type = 'radio' id = 'mode0' name = 'mode' onclick = 'mode = 0' CHECKED>
      <label for = 'mode0'><u>Normal:</u> Balls bounce off of each other</label>
      <br>
      <input type = 'radio' id = 'mode1' name = 'mode' onclick = 'mode = 1'>
      <label for = 'mode1'><u>Sticky:</u> Balls stick to each other</label>
      <br>
      <input type = 'radio' id = 'mode2' name = 'mode' onclick = 'mode = 2'>
      <label for = 'mode2'><u>Slow:</u> Balls pass slowly through each other</label>
      <br>
      <input type = 'radio' id = 'mode3' name = 'mode' onclick = 'mode = 3'>
      <label for = 'mode3'><u>Destroy:</u> Colliding balls have a 0.1% chance to destroy each other</label>
    </td>
    <td>
      <input type = 'checkbox' id = 'trailingcheck'>
      <label for = 'trailingcheck'>Trailing</label>
    </td>
    <td rowspan = '3'>
      <button onclick = 'randomizeBalls()'>Randomize Balls</button>
      <br>
      <button onclick = 'centerBalls()'>Center Balls</button>
    </td>
    <td>
      <img class = 'accentimg' src = 'https://e4494s.neocities.org/images/ballshine.png' onclick = 'switchAccent(this.src)'>
      <img class = 'accentimg' src = 'https://e4494s.neocities.org/images/bounce/circle.png' onclick = 'switchAccent(this.src)'>
      <img class = 'accentimg' src = 'https://e4494s.neocities.org/images/blank.png' onclick = 'switchAccent(this.src)'>
      <br>
      <input type = 'text' id = 'sourcetxt'>
      <label for = 'sourcetxt'>Accent Image Source</label>
      <br>
      <button onclick = 'changeSource()'>Set Source</button>
      <br>
      <input type = 'range' min = '0' max = '1' step = '0.05' value = '0.75' id = 'accentopacityrange'>
      <label for = 'accentopacityrange'>Accent Opacity</label>
    </td>
  </tr>
  <tr>
    <td>
      <p id = 'ballstxt'>Balls: 150</p>
    </td>
  </tr>
</table>
<canvas id = 'canvas'></canvas>
<script>
  const ctx = canvas.getContext('2d');
  let menu_rect = menus.getBoundingClientRect();
  let ratio = 3;
  canvas.width = window.innerWidth * ratio;
  canvas.height = (window.innerHeight - menu_rect.height) * ratio;
  canvas.style.width = `${window.innerWidth}px`;
  canvas.style.height = `${window.innerHeight - menu_rect.height}px`;
  let rect = canvas.getBoundingClientRect();

  //

  function drawCircle(x, y, size) {
    ctx.beginPath();
    ctx.arc(x + (size / 2), y + (size / 2), (size / 2), 0, Math.PI * 2);
    ctx.fill();
  }
  let randBetween = (min, max) => (Math.random() * (max - min)) + min;

  let randColor = () => `rgb(${Math.random() * 255}, ${Math.random() * 255}, ${Math.random() * 255})`;
  let randLightColor = () => `rgb(${randBetween(127.5, 255)}, ${randBetween(127.5, 255)}, ${randBetween(127.5, 255)})`;
  let randDarkColor = () => `rgb(${Math.random() * 100}, ${Math.random() * 100}, ${Math.random() * 100})`;

  let coin = () => Math.round(Math.random()) == 0;

  let circlesTouching = (x1, y1, r1, x2, y2, r2) => (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2) <= ((r1 + r2) * (r1 + r2));

  //

  let mode = 0;
  // 0: Normal
  // 1: Sticky
  // 2: Slow
  // 3: Destroy
  let trailing = false;
  trailingcheck.onchange = function() {
    if (trailing) trailing = false;
    else {
      trailing = true;
      ctx.clearRect(0, 0, canvas.width, canvas.height);
      /*ctx.fillStyle = 'black';
      ctx.globalAlpha = 1 / trail_length;
      ctx.fillRect(0, 0, canvas.width, canvas.height);*/
    }
  };
  let trail_length = 10;
  if (trailing) {
    ctx.fillStyle = 'black';
    ctx.globalAlpha = 1 / trail_length;
    ctx.fillRect(0, 0, canvas.width, canvas.height);
  }

  let friction = 0.05;
  let default_density = 0.25;
  let gravity = 0.3 * ratio;

  let accent = new Image();
  accent.src = 'https://e4494s.neocities.org/images/ballshine.png';
  let accent_opacity = 0.75;

  function switchAccent(new_accent) {
    accent.src = new_accent;
  }
  accentopacityrange.oninput = function() {
    accent_opacity = this.value;
  };

  function changeSource() {
    accent.src = sourcetxt.value;
  }

  let pop_image = new Image();
  pop_image.src = 'https://e4494s.neocities.org/images/ballshine.png';

  function ball() {
    this.x = 0;
    this.y = 0;
    this.vx = 0;
    this.vy = 0;
    this.size = 50 * ratio;
    this.density = 0.25;
    this.mass = Math.PI * (this.size / 2) * (this.size / 2) * this.density;
    this.center = {x: this.x + (this.size / 2), y: this.y + (this.size / 2)};
    this.bounciness = 0.8;
    this.color = 'blue';
    this.colliding = false;
    this.hitbox = true;
    this.render = function() {
      if (!this.hitbox) return;
      this.x += (mode == 0 || mode == 3)?this.vx:mode == 1?this.colliding?0:this.vx:this.vx / (this.colliding?5:1);
      this.y += (mode == 0 || mode == 3)?this.vy:mode == 1?this.colliding?0:this.vy:this.vy / (this.colliding?5:1);
      this.vy += gravity;

      this.center.x = this.x + (this.size / 2);
      this.center.y = this.y + (this.size / 2);
      this.mass = Math.PI * (this.size / 2) * (this.size / 2) * this.density;

      if (this.y <= 0) { // Bounce off the top
        this.y = 0;
        this.vy *= -this.bounciness;
        this.vx *= 1 - friction;
      }
      if (this.x <= 0) { // Bounce off the left
        this.x = 0;
        this.vx *= -this.bounciness;
      }
      if (this.y + this.size >= canvas.height) { // Bounce off the bottom
        this.y = canvas.height - this.size;
        this.vy *= -this.bounciness;
        this.vx *= 1 - friction;
      }
      if (this.x + this.size >= canvas.width) { // Bounce off the right
        this.x = canvas.width - this.size;
        this.vx *= -this.bounciness;
      }
      //ctx.fillStyle = this.color;
      if (mode == 0) {
        ctx.fillStyle = this.color;
      }
      if (mode == 1) {
        ctx.fillStyle = this.colliding?'green':this.color;
      }
      if (mode == 2) {
        ctx.fillStyle = this.colliding?'blue':this.color;
      }
      if (mode == 3) {
        ctx.fillStyle = this.colliding?'red':this.color;
      }
      ctx.globalAlpha = 1;
      drawCircle(this.x, this.y, this.size);
      ctx.globalAlpha = accent_opacity;
      ctx.drawImage(accent, this.x, this.y, this.size, this.size);
    };
  }

  let balls = [];

  function makeBall(x, y, size, bounciness, density, color) {
    let new_ball = new ball();
    new_ball.x = x;
    new_ball.y = y;
    new_ball.vx = randBetween(0, 5 * ratio) * (coin()?1:-1);
    if (gravity == 0) new_ball.vy = randBetween(0, 5 * ratio) * (coin()?1:-1);
    new_ball.size = size;
    new_ball.density = density;
    new_ball.bounciness = bounciness;
    new_ball.color = color;
    balls.push(new_ball);
  }

  function detectCollisions() {
    for (let i = 0; i < balls.length; i++) {
      balls[i].colliding = false;
    }
    for (let i = 0; i < balls.length; i++) {
      for (let j = 0; j < balls.length; j++) {
        if (i != j && balls[i].hitbox && balls[j].hitbox) {
          if (circlesTouching(balls[i].center.x, balls[i].center.y, balls[i].size / 2, balls[j].center.x, balls[j].center.y, balls[j].size / 2)) {
            let ball1 = balls[i];
            let ball2 = balls[j];
            ball1.colliding = true;
            ball2.colliding = true;
            if (mode == 0 || mode == 3) {
              let vCollision = {x: ball2.center.x - ball1.center.x, y: ball2.center.y - ball1.center.y};
              let distance = Math.sqrt((ball2.center.x - ball1.center.x) * (ball2.center.x - ball1.center.x) + (ball2.center.y - ball1.center.y) * (ball2.center.y - ball1.center.y));
              let vCollisionNorm = {x: vCollision.x / distance, y: vCollision.y / distance};
              let vRelativeVelocity = {x: ball1.vx - ball2.vx, y: ball1.vy - ball2.vy};
              let speed = vRelativeVelocity.x * vCollisionNorm.x + vRelativeVelocity.y * vCollisionNorm.y;
              if (speed >= 0) {
                let impulse = 2 * speed / (ball1.mass + ball2.mass);
                ball1.vx -= (impulse * ball2.mass * vCollisionNorm.x);
                ball1.vy -= (impulse * ball2.mass * vCollisionNorm.y);
                ball2.vx += (impulse * ball1.mass * vCollisionNorm.x);
                ball2.vy += (impulse * ball1.mass * vCollisionNorm.y);
              }
            }
            if (mode == 1) {
              ball1.vx = 0;
              ball1.vy = 0;
              ball2.vx = 0;
              ball2.vy = 0;
            }
            if (mode == 3) {
              if (Math.ceil(Math.random() * 1000) == 500) {
                ball1.hitbox = false;
                makePop(ball1.x + (ball1.size / 2), ball1.y + (ball1.size / 2), 0, 30, 7 * ratio);
                ball2.hitbox = false;
                makePop(ball2.x + (ball2.size / 2), ball2.y + (ball2.size / 2), 0, 30, 7 * ratio);
              }
            }
          }
        }
      }
    }
  }

  function pop() {
    this.x = 0;
    this.y = 0;
    this.starting_size = 50 * ratio;
    this.tick = 0;
    this.max_ticks = 500;
    this.speed = 0.5 * ratio;
    this.finished = false;
    this.render = function() {
      ctx.globalAlpha = 1 - ((1 / this.max_ticks) * this.tick);
      if (!this.finished) ctx.drawImage(pop_image, this.x - (this.tick * this.speed * 0.5), this.y - (this.tick * this.speed * 0.5), this.starting_size + (this.tick * this.speed), this.starting_size + (this.tick * this.speed));
      this.tick++;
      if (this.tick >= this.max_ticks) this.finished = true;
    };
  }

  let pops = [];

  function makePop(x, y, starting_size, max_ticks, speed) {
    let new_pop = new pop();
    new_pop.x = x;
    new_pop.y = y;
    new_pop.starting_size = starting_size;
    new_pop.max_ticks = max_ticks;
    new_pop.speed = speed;
    pops.push(new_pop);
  }

  let starting_balls = 150;
  for (let i = 0; i < starting_balls - 1; i++) {
    let i_size =  randBetween(25 * ratio, 50 * ratio);
    //let i_size = 10;
    makeBall(randBetween(0, canvas.width - i_size), randBetween(0, canvas.height - i_size), i_size, Math.random(), default_density, randDarkColor());
  }
  makeBall(randBetween(0, canvas.width - (150 * ratio)), randBetween(0, canvas.height - (150 * ratio)), 150 * ratio, Math.random(), default_density, randDarkColor());

  let impulse = 10;

  function frame() {
    if (trailing) {
      ctx.globalAlpha = 1 / trail_length;
      ctx.fillStyle = 'black';
      ctx.fillRect(0, 0, canvas.width, canvas.height);
      ctx.globalAlpha = 1;
    }
    else ctx.clearRect(0, 0, canvas.width, canvas.height);
    for (let i = 0; i < balls.length; i++) {
      balls[i].render();
      if (!balls[i].hitbox) balls.splice(i, 1);
    }
    detectCollisions();
    for (let i = 0; i < pops.length; i++) {
      pops[i].render();
      if (pops[i].finished) pops.splice(i, 1);
    }
    ballstxt.innerHTML = `Balls: ${balls.length}`;
    requestAnimationFrame(frame);
    //setTimeout(() => requestAnimationFrame(frame), 100);
  }
  frame();

  function randomizeBalls() {
    for (let i = 0; i < balls.length; i++) {
      balls[i].colliding = false;
      balls[i].x = randBetween(0, canvas.width - balls[i].size);
      balls[i].y = randBetween(0, canvas.height - balls[i].size);
      balls[i].vx = randBetween(0, 20 * ratio) * (coin()?1:-1);
      balls[i].vy = randBetween(0, 20 * ratio) * (coin()?1:-1);
    }
  }
  function centerBalls() {
    for (let i = 0; i < balls.length; i++) {
      balls[i].x = (canvas.width / 2) - (balls[i].size / 2);
      balls[i].y = (canvas.height / 2) - (balls[i].size / 2);
      balls[i].vx = randBetween(0, 20 * ratio) * (coin()?1:-1);
      balls[i].vy = randBetween(0, 20 * ratio) * (coin()?1:-1);
    }
  }

  let mouse_down = false;

  function keyDownHandler(e) {
    let k = e.code;
    if (k == 'ArrowUp' || k == 'ArrowLeft' || k == 'ArrowDown' || k == 'ArrowRight' || k == 'Tab') e.preventDefault();
    for (let i = 0; i < balls.length; i++) {
      if (k == 'KeyW' || k == 'ArrowUp') balls[i].vy -= impulse * ratio;
      if (k == 'KeyA' || k == 'ArrowLeft') balls[i].vx -= impulse * ratio;
      if (k == 'KeyS' || k == 'ArrowDown') balls[i].vy += impulse * ratio;
      if (k == 'KeyD' || k == 'ArrowRight') balls[i].vx += impulse * ratio;
    }
  }
  addEventListener('keydown', keyDownHandler);

  function mouseDownHandler(e) {
    mouse_down = true;
    let size =  randBetween(25 * ratio, 50 * ratio);
    if ((e.clientY * ratio) - (size / 2) > (rect.top * ratio) && (e.clientX * ratio) - (size / 2) > (rect.left * ratio) && (e.clientY * ratio) + (size / 2) < (rect.bottom * ratio) && (e.clientX * ratio) + (size / 2) < (rect.right * ratio)) makeBall((e.clientX * ratio) - (size / 2) - (rect.left * ratio), (e.clientY * ratio) - (size / 2) - (rect.top * ratio), size, Math.random(), default_density, randDarkColor());
  }
  addEventListener('mousedown', mouseDownHandler);
  function mouseUpHandler(e) {
    mouse_down = false;
  }
  addEventListener('mouseup', mouseUpHandler);
  function mouseMoveHandler(e) {
    let size =  randBetween(25 * ratio, 50 * ratio);
    //if (e.clientY - (size / 2) > rect.top && e.clientX - (size / 2) > rect.left && e.clientY + (size / 2) < rect.bottom && e.clientX + (size / 2) < rect.right && mouse_down) makeBall(e.clientX - (size / 2) - rect.left, e.clientY - (size / 2) - rect.top, size, Math.random(), default_density, randDarkColor());
    if ((e.clientY * ratio) - (size / 2) > (rect.top * ratio) && (e.clientX * ratio) - (size / 2) > (rect.left * ratio) && (e.clientY * ratio) + (size / 2) < (rect.bottom * ratio) && (e.clientX * ratio) + (size / 2) < (rect.right * ratio) && mouse_down) makeBall((e.clientX * ratio) - (size / 2) - (rect.left * ratio), (e.clientY * ratio) - (size / 2) - (rect.top * ratio), size, Math.random(), default_density, randDarkColor());
  }
  addEventListener('mousemove', mouseMoveHandler);

  //
  //
  //

  let fullscreen = false;
  let url = new URLSearchParams(window.location.search);
  let cmd = url.get('command');
  eval(cmd);
  canvas.width = window.innerWidth * ratio;
  canvas.height = (window.innerHeight - menu_rect.height) * ratio;
  canvas.style.width = `${window.innerWidth}px`;
  canvas.style.height = `${window.innerHeight - menu_rect.height}px`;
  if (fullscreen) {
    canvas.width = window.innerWidth * ratio;
    canvas.height = window.innerHeight * ratio;
    canvas.style.width = `${window.innerWidth}px`;
    canvas.style.height = `${window.innerHeight}px`;
    rect = canvas.getBoundingClientRect();
  }
  let balls_cmd = url.get('balls_command');
  for (let i = 0; i < balls.length; i++) eval(balls_cmd);
</script>
</body>
</html>