var myGamePiece; var myObstacles = []; var myScore; function startGame(){ myGameArea.start(); myGamePiece = new component(30,30,"red",10,120); myObstacle = new component(10,200, "green",300,120); myScore = new component("30px", "Consolas", "black", 280, 40, "text"); } 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); window.addEventListener('touchmove',function(e){ myGameArea.x = e.touches[0].screenX; myGameArea.y = e.touches[0].screenY; }) }, clear: function(){ this.context.clearRect(0,0,this.canvas.width,this.canvas.height); }, stop: function(){ clearInterval(this.interval); } } //new game piece Object constructor function function component(width,height,color,x,y,type){ this.type = type; this.width = width; this.height = height; this.speedX = 0; this.speedY = 0; this.x = x; this.y = y; 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.x += this.speedX; this.y += this.speedY } 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 everyinterval(n){ if((myGameArea.frameNo/n)%1==0){ return true; } return false; } function updateGameArea() { var x, height, gap, minHeight, maxHeight, minGap, maxGap; for (i = 0; i < myObstacles.length; i += 1) { if (myGamePiece.crashWith(myObstacles[i])) { var v = document.getElementById("ban"); v.innerHTML = "

GAME OVER

Comment your highest score

"; myGameArea.stop(); 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].speedX = -1; myObstacles[i].newPos(); myObstacles[i].update(); } myScore.text="SCORE: " + myGameArea.frameNo; myScore.update(); myGamePiece.newPos(); myGamePiece.update(); var v = document.getElementById("can"); v.innerHTML = "Your score is: " + myGameArea.frameNo + ""; } function moveup(){ myGamePiece.speedY -= 1; } function movedown(){ myGamePiece.speedY += 1; } function moveleft(){ myGamePiece.speedX -= 1; } function moveright(){ myGamePiece.speedX += 1; } function stopMove(){ myGamePiece.speedX = 0; myGamePiece.speedY = 0; }

canvas game