gamedev/random_function.html at master · someshrf/gamedev · GitHub

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<html>
<head>
	<title>Random generation</title>
	<style type="text/css">
	body
	{
	 padding: 5px;
	 margin: 0;
	}
	canvas
	 {
	  background: gray;
    display: block;
    margin:0 auto;
	}

</style>
</head>
<body>
<canvas id = "canvas" width = "500" height = "600"></canvas>
</body>
<script type="text/javascript">
  var canvas = document.getElementById("canvas");
  var ctx = canvas.getContext("2d");
  document.addEventListener("keydown", update);

  var lives=3;var flag=0;
   var lineY=0;

  function object (x,y,status,width,height,speed,oldObject) {
  	this.x = x;
  	this.y = y;
  	this.width = width;
  	this.height = height;
  	this.status = status;
  	this.speed = speed;
  	this.oldObject = oldObject;
  }

 var dy=2;

    function whiteLines()
  {
  if(lineY<=600)
  lineY=lineY+dy;
  else
  lineY=0;
var x;
var hundred=100;
for(x=0;x<5;x++)
  drawWhiteLines(72.5,lineY+x*100,10,70);

for(x=1;x<=6;x++)
  drawWhiteLines(72.5,lineY-(x*100),10,70);
for(x=0;x<5;x++)
   drawWhiteLines(245.33333,lineY+x*100,10,70);

for(x=1;x<=6;x++)
 drawWhiteLines(245.33333,lineY-(x*100),10,70);

for(x=0;x<5;x++)
  drawWhiteLines(415.33333,lineY+x*100,10,70);

for(x=1;x<=6;x++)
drawWhiteLines(415.33333,lineY-(x*100),10,70);
  }
  function drawWhiteLines(x,y,width,height)
  {

  ctx.beginPath();
  ctx.rect(x,y,width,height);
  ctx.fillStyle="white";
  ctx.fill();
  }
 function background()
  {
  ctx.beginPath();
  ctx.rect(155,0,5,600);
  ctx.fillStyle="yellow";
  ctx.fill();
  ctx.rect(162,0,5,600);
  ctx.fill();
  ctx.rect(325,0,5,600);
  ctx.fill();
   ctx.rect(332,0,5,600);
  ctx.fill();
  //ctx.fillStyle = "green";
  ctx.closePath();
  //ctx.fillStyle = "#00FF00";
  whiteLines();
 }


  var obstacle = new object(40,0,true,70,120,5,true);
  var car = new object(30,420,false,100,150,20,false);
  var imgTag = new Image();
  imgTag.src = "car1.png";
  imgTag.onload = gamePlay;
  var img= new Image();
  img.src="enemycar.png";
  var gameover=new Image();
  gameover.src="gameover.jpg";
  var nitro= new Image();
  nitro.src="nitro.png";

  var random = 0;
  function obstacleGeneration(){
    if(!obstacle.oldObject){
     ctx.clearRect(obstacle.x,obstacle.y,obstacle.width,obstacle.height);
  	 var random = Math.round(Math.random()*2);
     flag=0;
  	 ///alert("hi");
  	 obstacle.x = (30+170*random);

  	 //y_coordinate = 0;
  	 obstacle.status = true;
  	 ctx.drawImage(img,obstacle.x,obstacle.y,obstacle.width,obstacle.height);

  	 /*ctx.beginPath();
  	 ctx.rect(obstacle.x,obstacle.y,obstacle.width,obstacle.height);//drawing the game space for the game
     ctx.fillStyle = "#00FF00";
     ctx.fill();
     ctx.fillStyle = "#00FF00";
     ctx.closePath();
     obstacle.oldObject = true;
     ctx.fillStyle = "#00FF00";
      */ }

    }
  function drawObstacle(){
  	if(obstacle.status){
  	 ctx.beginPath();

  	 /*ctx.rect(obstacle.x,obstacle.y,obstacle.width,obstacle.height);//drawing the game space for the game
     ctx.fillStyle = "#00FF00";
     ctx.fill();
     ctx.fillStyle = "green";
     ctx.closePath();
     */
     ctx.drawImage(img,obstacle.x,obstacle.y,obstacle.width,obstacle.height);
    }
   else{
      ctx.clearRect(obstacle.x,obstacle.y,obstacle.width,obstacle.height);
    	obstacleGeneration();

    }

  }

  function obstacleMovement(y,speed){
  	return y + speed;

  }


function drawCar()
{
  ctx.drawImage(imgTag, car.x, car.y);
}
function drawNitro()
{
	ctx.drawImage(nitro,car.x+15,car.y+145,70,45);
}

function detect(obstacleX,obstacleY,obstacleW,obstacleH){

  if(car.y<=obstacleY+obstacleH){
    if(flag==0&&((car.x>=obstacleX)&&(car.x<=obstacleX+obstacleW))||((car.x+car.width>=obstacleX)&&(car.x+car.width<=obstacleX+obstacleW))){
     {lives--;flag=1; obstacle.y=601;
if(lives==0)
      {car.status=true; console.log(car.status);  } }
    }
    if(flag==0&&(obstacleX>=car.x)&&(obstacleX+obstacleW<=car.x+car.width)){
     { lives--;flag=1; obstacle.y=601;
if(lives==0)
     {car.status=true; console.log(car.status);  } }
    }

  }
}

function changelane(direction)
{
  if(direction=="right")
  {if((car.x>=0)&&(car.x+150<=canvas.width-imgTag.width))
        car.x +=170;}
  else if(direction="left")
  {if((car.x-150>=0)&&(car.x<=canvas.width-imgTag.width))
        car.x-=170;}
}
function update(event)
  {
    if (event.keyCode == 37)
    {
    if((car.x-150>=0)&&(car.x<=canvas.width-imgTag.width))
        car.x-=170;
    }
    if (event.keyCode == 39)
    {
    if((car.x>=0)&&(car.x+150<=canvas.width-imgTag.width))
        car.x +=170;
    }
  }

    document.addEventListener("keydown",keyDownHandler,false);
    document.addEventListener("keyup",keyUpHandler,false);
    var enterPress=false;
    var nitroPress=false;

    function keyDownHandler(e) {
     	if(e.keyCode==13) {
     		enterPress=true;
     	}
        if(e.keyCode==78) {
     		nitroPress=true;
     	}
    }
  function keyUpHandler(e) {
     	if(e.keyCode==13) {
     		enterPress=false;
     	}
        if(e.keyCode==13) {
     		nitroPress=false;
     	}
  }

 var nitropress=new Date();
 var nitroend=new Date();
 var flagtime=false;

 function gamePlay(){
 console.log(car.status);
    if(!car.status){

         ctx.clearRect(0,0,canvas.width,canvas.height);
  background();
      drawCar();
    //	console.log(obstacle.status      +"      "+ obstacle.x_coordinate+"    "+obstacle.y_coordinate+"    "+obstacle.oldObject);
      if(nitroPress)
       	{ dy=4;
          drawNitro();
          if(!flagtime)
          	 {nitropress=Date.now();
          	  flagtime++;
          	 }
       	}
       	 nitroend=Date.now();

         if(Math.floor(((nitroend-nitropress)/1000)%60)>2)
         	{   nitroPress=false;
         		dy=2;
             	ctx.clearRect(car.x+15,car.y+145,70,45);
             	flagtime=0;
             }

    	if(obstacle.y>canvas.height){
         obstacle.status = false;
         obstacle.oldObject=false;
         obstacle.y = 0;
         //obstacleGeneration(obstacle.x_coordinate,obstacle.y_coordinate,obstacle.width,obstacle.height,obstacle.status);

    	}


      obstacle.y = obstacleMovement(obstacle.y,obstacle.speed);

      detect(obstacle.x,obstacle.y,obstacle.width,obstacle.height);


    	drawObstacle(obstacle.x,obstacle.y,obstacle.width,obstacle.height,obstacle.status);


       }
    else{
     ctx.drawImage(gameover,130,80,250,180);

      ctx.beginPath();
      ctx.rect(130,260,250,100);
      ctx.fill();


      ctx.font="bold 25px serif";
      ctx.fillStyle="green";
      ctx.fillText("enter to start",153,280);
      ctx.fillStyle="black";
      ctx.closePath();

    }
    requestAnimationFrame(gamePlay);
    ctx.fillStyle="black";
    if(enterPress==true)
     document.location.reload();
 }

    //obstacleGeneration();
    gamePlay();


</script>

</html>