html转盘游戏代码,html5 转盘 例子 附完整源码 有截图 亲测通过

【实例简介】html5 转盘实例 可直接拿来做 抽奖程序

【实例截图】

【核心代码】

var colors = ["#B8D430", "#3AB745", "#029990", "#3501CB",

"#2E2C75", "#673A7E", "#CC0071", "#F80120",

"#F35B20", "#FB9A00", "#FFCC00", "#FEF200"];

var restaraunts = ["北京", "上海", "天津", "南京",

"杭州", "深圳", "武汉", "济南",

"重庆", "大连", "合肥", "郑洲"];

var startAngle = 0;

var arc = Math.PI / 6;

var spinTimeout = null;

var spinArcStart = 10;

var spinTime = 0;

var spinTimeTotal = 0;

var ctx;

function draw() {

drawRouletteWheel();

}

function drawRouletteWheel() {

var canvas = document.getElementById("wheelcanvas");

if (canvas.getContext) {

var outsideRadius = 200;

var textRadius = 160;

var insideRadius = 125;

ctx = canvas.getContext("2d");

ctx.clearRect(0,0,500,500);

ctx.strokeStyle = "black";

ctx.lineWidth = 2;

ctx.font = 'bold 12px sans-serif';

for(var i = 0; i < 12; i ) {

var angle = startAngle i * arc;

ctx.fillStyle = colors[i];

ctx.beginPath();

ctx.arc(250, 250, outsideRadius, angle, angle arc, false);

ctx.arc(250, 250, insideRadius, angle arc, angle, true);

ctx.stroke();

ctx.fill();

ctx.save();

ctx.shadowOffsetX = -1;

ctx.shadowOffsetY = -1;

ctx.shadowBlur = 0;

ctx.shadowColor = "rgb(220,220,220)";

ctx.fillStyle = "black";

ctx.translate(250 Math.cos(angle arc / 2) * textRadius, 250 Math.sin(angle arc / 2) * textRadius);

ctx.rotate(angle arc / 2 Math.PI / 2);

var text = restaraunts[i];

ctx.fillText(text, -ctx.measureText(text).width / 2, 0);

ctx.restore();

}

//Arrow

ctx.fillStyle = "black";

ctx.beginPath();

ctx.moveTo(250 - 4, 250 - (outsideRadius 5));

ctx.lineTo(250 4, 250 - (outsideRadius 5));

ctx.lineTo(250 4, 250 - (outsideRadius - 5));

ctx.lineTo(250 9, 250 - (outsideRadius - 5));

ctx.lineTo(250 0, 250 - (outsideRadius - 13));

ctx.lineTo(250 - 9, 250 - (outsideRadius - 5));

ctx.lineTo(250 - 4, 250 - (outsideRadius - 5));

ctx.lineTo(250 - 4, 250 - (outsideRadius 5));

ctx.fill();

}

}

function spin() {

spinAngleStart = Math.random() * 10 10;

spinTime = 0;

spinTimeTotal = Math.random() * 3 4 * 1000;

rotateWheel();

}

function rotateWheel() {

spinTime = 30;

if(spinTime >= spinTimeTotal) {

stopRotateWheel();

return;

}

var spinAngle = spinAngleStart - easeOut(spinTime, 0, spinAngleStart, spinTimeTotal);

startAngle = (spinAngle * Math.PI / 180);

drawRouletteWheel();

spinTimeout = setTimeout('rotateWheel()', 30);

}

function stopRotateWheel() {

clearTimeout(spinTimeout);

var degrees = startAngle * 180 / Math.PI 90;

var arcd = arc * 180 / Math.PI;

var index = Math.floor((360 - degrees % 360) / arcd);

ctx.save();

ctx.font = 'bold 30px sans-serif';

var text = restaraunts[index]

ctx.fillText(text, 250 - ctx.measureText(text).width / 2, 250 10);

ctx.restore();

}

function easeOut(t, b, c, d) {

var ts = (t/=d)*t;

var tc = ts*t;

return b c*(tc -3*ts 3*t);

}

draw();

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