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lesson2.html
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lesson2.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Gamedev Canvas Workshop</title>
<style>
* { padding: 0; margin: 0; }
canvas { background: #eee; display: block; margin: 0 auto; }
</style>
</head>
<body>
<canvas id="myCanvas" width="480" height="320"></canvas>
<script>
var canvas= document.getElementById("myCanvas");
var ctx= canvas.getContext("2d");
//positionning ball
var x = canvas.width/2;
var y = canvas.height-30;
var dx = 2;
var dy = -2;
//ball characs
var ballRadius = 10;
var r=0;
var g=110;
var b=0;
var color = "rgb("+r+","+g+","+b+")";
//paddle chars
var paddleHeight= 10;
var paddleWidth = 60;
var paddleX=(canvas.width-paddleWidth)/2;
//keyboard listeners
var rightPressed=false;
var leftPressed = false;
//Bricks
var brickRowCount = 3;
var brickColumnCount = 5;
var brickWidth = 75;
var brickHeight = 20;
var brickPadding = 10;
var brickOffsetTop = 30;
var brickOffsetLeft = 30;
var bricks = [];
for(c=0;c<brickColumnCount;c++){
bricks[c]=[];
for(r=0;r<brickRowCount;r++){
bricks[c][r] = {x:0,y:0,status:1};
}}
//SCORE
var score = 0;
function drawBall(){
ctx.beginPath();
ctx.arc(x,y,ballRadius,0,Math.PI*2,true);
ctx.fillStyle=color;
ctx.fill();
ctx.closePath();}
function drawPaddle(){
ctx.beginPath();
ctx.rect(paddleX, canvas.height-paddleHeight, paddleWidth, paddleHeight);
ctx.fillStyle = "#0095DD";
ctx.fill();
ctx.closePath();}
function drawBricks(){
for(c=0;c<brickColumnCount;c++){
for(r=0;r<brickRowCount;r++){
if(bricks[c][r].status==1){
var brickX = c*(brickWidth+brickPadding)+brickOffsetLeft;
var brickY = r*(brickHeight+brickPadding)+brickOffsetTop;
bricks[c][r].x = brickX;
bricks[c][r].y = brickY;
ctx.beginPath();
ctx.rect(brickX,brickY,brickWidth,brickHeight);
ctx.fillStyle = 'red';
ctx.fill();
ctx.closePath();
}}
}}
function drawScore(){
ctx.font = "16px Arial";
ctx.fillstyle="#0095DD";
ctx.fillText("Score: " + score, 8, 20);
}
function randColor(){
r=Math.floor(Math.random()*256);
g=Math.floor(Math.random()*256);
b=Math.floor(Math.random()*256);
return "rgb("+r+","+g+","+b+")";}
function paddleLogic(){
if(rightPressed && paddleX<canvas.width-paddleWidth){
paddleX+=7;
}
else if(leftPressed && paddleX>0){
paddleX-=7;
}}
function ballLogic(){
if(y+dy<0){
dy=-dy;
color=randColor();
}
else if(y+dy>canvas.height-ballRadius){
if(x>paddleX&&x<paddleX+paddleWidth){
dy=-dy;
color = randColor();
}
else{
alert("GAME OVER");
document.location.reload();
}
}
if(x + dx > canvas.width-ballRadius || x + dx < 0) {
dx = -dx;
r=Math.floor(Math.random()*256);
g=Math.floor(Math.random()*256);
b=Math.floor(Math.random()*256);
color = "rgb("+r+","+g+","+b+")";
}
}
function collisionDetection() {
for(c=0; c<brickColumnCount; c++) {
for(r=0; r<brickRowCount; r++) {
var b = bricks[c][r];
if(x > b.x && x < b.x+brickWidth && y > b.y && y < b.y+brickHeight &&b.status==1) {
dy = -dy;
b.status =0;
score++;
}
}
}
}
function winDetection(){
if(score==brickRowCount*brickColumnCount){
alert("You win, congrats!");
document.location.reload();
}
}
function draw() {
winDetection();
ctx.clearRect(0,0,canvas.width,canvas.height);
drawScore();
drawBricks();
drawBall();
drawPaddle();
paddleLogic();
ballLogic();
collisionDetection();
x+=dx;
y+=dy;
requestAnimationFrame(draw);
}
document.addEventListener("keydown",keyDownHandler, false);
document.addEventListener("keyup",keyUpHandler, false);
document.addEventListener("mousemove",mouseMoveHandler, false);
function keyDownHandler(e){
if(e.keyCode ==39){
rightPressed=true;
}
else if(e.keyCode == 37){
leftPressed=true;
}}
function keyUpHandler(e){
if(e.keyCode ==39){
rightPressed=false;
}
else if(e.keyCode == 37){
leftPressed=false;
}}
function mouseMoveHandler(e){
var relativeX = e.clientX - canvas.offsetLeft;
if(relativeX>0 && relativeX<canvas.width){
paddleX = relativeX - paddleWidth/2;
}
}
draw();
</script>
</body>
</html>