Make A Simple Game Using HTML

Hello world, I am back with another interesting blog. In this blog I am going to show you how you can make a simple game using HTML.

Let's start

I am not going to make it tough I have already prepaired a code just paste it into notepad and your game is ready to run.

   <!DOCTYPE html>
   <html>
   <head>
   <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
   <style>
   canvas {
    border:1px solid #000000;
    background-color: #F4ECEC;
     }
    </style>
   </head>
   <body onload="startGame()">
   <script>

   var myGamePiece;
   var myObstacles = [];
   var myScore;

   function startGame() {
  myGamePiece = new component(30, 30, "red", 10, 120);
  myGamePiece.gravity = 0.05;
  myScore = new component("30px", "Consolas", "black", 280, 40, "text");
  myGameArea.start();
  }

 var myGameArea = {
   canvas : document.createElement("canvas"),
   start : function() {
     this.canvas.width = 1000;
    this.canvas.height = 500;
    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.score = 0;
  this.width = width;
  this.height = height;
  this.speedX = 0;
  this.speedY = 0;    
  this.x = x;
  this.y = y;
  this.gravity = 0;
  this.gravitySpeed = 0;
  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, "green", x, 0));
    myObstacles.push(new component(10, x - height - gap, "green", 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>
  <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>
  </body>
  </html>

Now the game is ready!

This is the output

Screenshot 2021-05-29 132543.png

You can change the background, border, obstacle and object's color according to you.

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