game gaje

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>GAME</title>
    <style>
      canvas {
        border: 1px solid #d3d3d3;
        background-color: #f1f1f1;
      }
    </style>
  </head>
  <body onload="startGame()">
    <br />
    <button onmousedown="accelerate(-0.2)" onmouseup="accelerate(0.05)">ACCELERATE</button>
    <p>Use the ACCELERATE button to stay in the air</p>
    <p>How long can you stay alive?</p>
    <script>
      var myGamePiece;
      var myObstacles = [];
      var myScore;

      function startGame() {
        myGamePiece = new component(30, 30, "red", 10, 120);
        myGamePiece.gravity = 1;
        myScore = new component("30px", "Consolas", "black", 280, 40, "text");
        myGameArea.start();
      }

      var myGameArea = {
        canvas: document.createElement("canvas"),
        start: function () {
          this.canvas.width = 480;
          this.canvas.height = 270;
          this.context = this.canvas.getContext("2d");
          document.body.insertBefore(this.canvas, document.body.childNodes[0]);
          this.frameNo = 0;
          this.interval = setInterval(updateGameArea, 20);
        },
        clear: function () {
          this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
        },
      };

      function component(width, height, color, x, y, type) {
        this.type = type;
        this.text = "";
        this.width = width;
        this.height = height;
        this.speedX = 0;
        this.speedY = 0.05;
        this.x = x;
        this.y = y;
        this.gravity = 0.2;
        this.gravitySpeed = 0.1;
        this.update = function () {
          ctx = myGameArea.context;
          if (this.type == "text") {
            ctx.font = this.width + " " + this.height;
            ctx.fillStyle = color;
            ctx.fillText(this.text, this.x, this.y);
          } else {
            ctx.fillStyle = color;
            ctx.fillRect(this.x, this.y, this.width, this.height);
          }
        };
        this.newPos = function() {
          this.gravitySpeed += this.gravity;
          this.x += this.speedX;
          this.y += this.speedY + this.gravitySpeed;
          this.hitBottom();
        };
        this.hitBottom = function () {
          var rockbottom = myGameArea.canvas.height - this.height;
          if (this.y > rockbottom) {
            this.y = rockbottom;
            this.gravitySpeed = 0;
          }
        };
        this.crashWith = function(otherobj) {
          var myleft = this.x;
          var myright = this.x + this.width;
          var mytop = this.y;
          var mybottom = this.y + this.height;
          var otherleft = otherobj.x;
          var otherright = otherobj.x + otherobj.width;
          var othertop = otherobj.y;
          var otherbottom = otherobj.y + otherobj.height;
          var crash = true;
          if (mybottom < othertop || mytop > otherbottom || myright < otherleft || myleft > otherright) {
            crash = false;
          }
          return crash;
        };
      }

      function updateGameArea() {
        var x, height, gap, minHeight, maxHeight, minGap, maxGap;
        for (i = 0; i < myObstacles.length; i += 1) {
          if (myGamePiece.crashWith(myObstacles[i])) {
            return;
          }
        }
        myGameArea.clear();
        myGameArea.frameNo += 1;
        if (myGameArea.frameNo == 1 || everyinterval(150)) {
          x = myGameArea.canvas.width;
          minHeight = 20;
          maxHeight = 200;
          height = Math.floor(Math.random() * (maxHeight - minHeight + 1) + minHeight);
          minGap = 50;
          maxGap = 200;
          gap = Math.floor(Math.random() * (maxGap - minGap + 1) + minGap);
          myObstacles.push(new component(10, height, "pink", x, 0));
          myObstacles.push(new component(10, x - height - gap, "pink", x, height + gap));
        }
        for (i = 0; i < myObstacles.length; i += 1) {
          myObstacles[i].x += -1;
          myObstacles[i].update();
        }
        myScore.text = "SCORE: " + myGameArea.frameNo;
        myScore.update();
        myGamePiece.newPos();
        myGamePiece.update();
      }

      function everyinterval(n) {
        if ((myGameArea.frameNo / n) % 1 == 0) {
          return true;
        }
        return false;
      }

      function accelerate(n) {
        myGamePiece.gravity = n;
      }
    </script>
  </body>
</html>