<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Gamedev Canvas Workshop - lesson 6: build the brick field</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");
var ballRadius = 10;
var x = canvas.width/2;
var y = canvas.height-30;
var dx = 2;
var dy = -2;
var paddleHeight = 10;
var paddleWidth = 75;
var paddleX = (canvas.width-paddleWidth)/2;
var rightPressed = false;
var leftPressed = false;
var brickRowCount = 5; //直的(行) 補充: 直有5個 x也要有5個點 r為x
var brickColumnCount = 3; //橫的(列) 補充: 橫有3個 y也要有3個點 c為y
var brickWidth = 75; //寬
var brickHeight = 20; //高
var brickPadding = 10; //方塊之間的間隔
var brickOffsetTop = 30; //最初開畫與上距離
var brickOffsetLeft = 30; //最初開畫與左距離
var bricks = []; //設成陣列
for(c=0; c<brickColumnCount; c++) {
bricks[c] = []; // 迴圈c<bCC 則++ 將磚塊設成陣列
for(r=0; r<brickRowCount; r++) {
bricks[c][r] = { x: 0, y: 0 }; // 迴圈c<bRC 則++ 設置磚塊從x=0,y=0繪製
}
}
document.addEventListener("keydown", keyDownHandler, false);
document.addEventListener("keyup", keyUpHandler, 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 drawBall() {
ctx.beginPath();
ctx.arc(x, y, ballRadius, 0, Math.PI*2);
ctx.fillStyle = "#0095DD";
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++) { // 迴圈c<磚塊列(bCC) 則++
for(r=0; r<brickRowCount; r++) { // 迴圈c<磚塊行(bRC) 則++
var brickX = (r*(brickWidth+brickPadding))+brickOffsetLeft; // 設定[r]磚塊繪製X軸
var brickY = (c*(brickHeight+brickPadding))+brickOffsetTop; // 設定[c]磚塊繪製Y軸
bricks[c][r].x = brickX; //將[c][r]的x 改名為brickX
bricks[c][r].y = brickY; //將[c][r]的y 改名為brickY
ctx.beginPath();
ctx.rect(brickX, brickY, brickWidth, brickHeight);
ctx.fillStyle = "#0095DD";
ctx.fill();
ctx.closePath();
}
}
}
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
drawBricks(); // 繪製磚塊
drawBall();
drawPaddle();
if(x + dx > canvas.width-ballRadius || x + dx < ballRadius) {
dx = -dx;
}
if(y + dy < ballRadius) {
dy = -dy;
}
else if(y + dy > canvas.height-ballRadius) {
if(x > paddleX && x < paddleX + paddleWidth) {
dy = -dy;
}
else {
alert("GAME OVER");
document.location.reload();
}
}
if(rightPressed && paddleX < canvas.width-paddleWidth) {
paddleX += 7;
}
else if(leftPressed && paddleX > 0) {
paddleX -= 7;
}
x += dx;
y += dy;
}
setInterval(draw, 10);
</script>
</body>
</html>
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