<!DOCTYPE html>
<head>
<meta charset="utf-8">
</head>
<body>
<div id="gameArea"><canvas id="gameCanvas"></canvas></div>
<script>
var gameHeight = window.innerHeight; //取得瀏覽器內容的高度，放進設定的遊戲視窗高度。
var gameWidth = window.innerWidth; //取得瀏覽器內容的寬度，放進設定的遊戲視窗寬度。
var gameArea = document.getElementById("gameArea"); //利用"gameArea"這個ID來取得該Div
var gameCanvas = document.getElementById("gameCanvas"); //利用"gameCanvas"這個ID來取得該Canvas
gameArea.style.height = gameHeight; //設定gameArea的高度為遊戲視窗高度
gameArea.style.width = gameWidth; //設定gameArea的寬度為遊戲視窗寬度
gameCanvas.height = gameHeight; //設定gameCanvas的高度為遊戲視窗高度
gameCanvas.width = gameWidth; //設定gameCanvas的高度為遊戲視窗寬度
gameCanvas.addEventListener("mousedown",doMouseDown,false);
function doMouseDown(event)
{
alert("x="+event.pageX+";y="+event.pageY);
}
var ctx = gameCanvas.getContext("2d"); //取得gameCanvas的2D容器(Context)
function clearScreen()
{
ctx.fillStyle = "rgb(255,255,255)";
ctx.fillRect(0,0,gameWidth,gameHeight);
}
function drawArc(x,y,r,color)
{
ctx.beginPath();
ctx.fillStyle = color;
ctx.arc(x,y,r,0,Math.PI*2,true);
ctx.fill();
}
var x = 500;
var y = 100;
var r = 30;
var d = 7;
var balls = 7;
var seats = new Array(balls);
for(var i=0;i<balls;i++)
seats[i] = new Array(balls);
function initGame()
{
for(var i=0;i<balls;i++)
for(var j=0;j<i;j++)
seats[i][j] = 0;
}
function gameLoop()
{
clearScreen();
for(var i = 0;i < balls;i++)
{
for(var j=0;j<=i;j++)
{
if(seats[i][j]==0)
drawArc(x-i*(r*2+d)/2+(r*2+d)*j,y+r*2*i,r,"rgb(0,255,128)");
else
drawArc(x-i*(r*2+d)/2+(r*2+d)*j,y+r*2*i,r,"rgb(0,128,128)");
}
}
setTimeout(gameLoop,200);
}
initGame();
gameLoop();
</script>
</body> |
