obniz developer team
Published © GPL3+

Obstacle Avoidance Game with Distance Sensor

Obstacle avoidance game like Flappy Bird. Move your hand to avoid the collision. It is easy to make and fun to play!

EasyFull instructions provided4 hours400

Things used in this project

Hardware components

obniz
Cambrian Robotics obniz
obniz.io
×1
Adafruit IR distance sensor
×1
iPhone
Apple iPhone
Computer or smartphone
×1
Android device
Android device
Computer or smartphone
×1

Story

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Code

Program

JavaScript
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <script src="https://obniz.io/js/jquery-3.2.1.min.js"></script>
  <script src="https://unpkg.com/obniz@1.9.1/obniz.js" crossorigin="anonymous"></script>
</head>
<body>

<div id="obniz-debug"></div>

<canvas id="field" width="300" height="300"/>

<script>
  let canvas = document.getElementById('field');
  let ctx = canvas.getContext('2d');
  let dot = [];
  let bars = [];
  let inputHeight = 0;
  let frameCount = 0;
  let obniz = new Obniz("OBNIZ_ID_HERE");
  obniz.onconnect = async function () {
    let sensor = obniz.wired("GP2Y0A21YK0F", {vcc: 2, gnd: 1, signal: 0});
    sensor.start(function (height) {
      inputHeight = height;
    })


  };

  function initialize() {
    ctx.fillStyle = "black";
    ctx.fillRect(0, 0, canvas.width, canvas.height);

    ctx.fillStyle = "white";
    ctx.font = "25pt Arial";
    ctx.fillText("Click to START", 40, 150);


    canvas.addEventListener('click', startGame, false);
  }

  initialize();

  function startGame() {

    frameCount = 0;
    for (let i = 0; i < canvas.width / 4; i++) {
      dot[i] = undefined;
    }
    dot[dot.length] = canvas.height / 2;

    bars = [];

    frame();

  }

  function frame() {

    frameCount++;
    ctx.fillStyle = "black";
    ctx.fillRect(0, 0, canvas.width, canvas.height);

    let input = (300 - inputHeight);
    input = Math.min(Math.max(0, input), canvas.height);
    dot.push(input);
    dot.shift();

    for (let i = bars.length - 1; i >= 0; i--) {
      bars[i].x--;
      if (bars[i].x + bars[i].width < 0) {
        bars.splice(i, 1);
      }
    }
    if (frameCount === 100) {
      frameCount = 0;
      if (Math.random() > 0.3) {

        bars.push({x: canvas.width, y: Math.random() * 380 - 80, width: 16, height: 160});
      } else {
        let hole = Math.random() * 300;
        bars.push({x: canvas.width, y: 0, width: 16, height: hole - 40});
        bars.push({x: canvas.width, y: hole + 40, width: 16, height: canvas.height});
      }

    }


    drawDots();
    drawBars();
    if (isHit()) {
      gameOver();
    } else {
      setTimeout(frame, 10);
    }

  }

  function drawDots() {
    ctx.strokeStyle = "white";
    ctx.lineWidth = 1;
    ctx.beginPath();

    for (let i = 0; i < dot.length - 1; i++) {

      if (dot[i] !== undefined && dot[i + 1] !== undefined) {

        ctx.moveTo(i, dot[i]);
        ctx.lineTo(i + 1, dot[i + 1]);
      }
    }
    ctx.closePath();
    ctx.stroke();


  }

  function drawBars() {
    ctx.fillStyle = "red";
    ctx.beginPath();

    for (let i = 0; i < bars.length; i++) {

      ctx.fillRect(bars[i].x, bars[i].y, bars[i].width, bars[i].height);
    }

  }

  function isHit() {
    let x = dot.length;
    let y = dot[dot.length - 1];

    for (let i = 0; i < bars.length; i++) {
      if (bars[i].x <= x && x <= bars[i].x + bars[i].width
          && bars[i].y <= y && y <= bars[i].y + bars[i].height) {
        return true;
      }
    }
    return false;

  }

  function gameOver() {

    ctx.fillStyle = "white";
    ctx.font = "25pt Arial";
    ctx.fillText("GAME OVER", 50, 100);
    ctx.fillText("Click to START", 40, 200);

  }

</script>
</body>
</html>

Credits

obniz developer team

obniz developer team

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