Question

我正在使用HTML5进行轮盘赌功能。我现在面临的问题是，我无法获得桌面上的所有数字，以正确适应自己的颜色！

由于某种原因，看起来轮子的一半是空的！

这是JSFIDDLE：

这就是代码：

<!--[if IE]><script type="text/javascript" src="/sites/default/files/1010/source/excanvas.js"></script><![endif]-->
<input type="button" value="spin" onclick="spin();" style="float: left;" />
<canvas id="wheelcanvas" width="500" height="500"></canvas>
<script type="application/javascript">
  var colors = ["#2a8251", "#dc0927", "#414243", "#dc0927", "#2E2C75", 
                  "#dc0927", "#414243", "#dc0927", "#2E2C75", 
                  "#dc0927", "#414243", "#dc0927", "#2E2C75",
                  "#dc0927", "#414243", "#dc0927", "#2E2C75",
                  "#dc0927", "#414243", "#dc0927", "#2E2C75",
                  "#dc0927", "#414243", "#dc0927", "#2E2C75",
                  "#dc0927", "#414243", "#dc0927", "#2E2C75",
                  "#dc0927", "#414243", "#dc0927", "#2E2C75",
                  "#dc0927", "#414243", "#dc0927", "#2E2C75"];
  var restaraunts = ["0", "32", "15", "19",
                     "4", "21", "2", "25",
                     "17", "34", "6", "27",
                     "13", "36", "11", "30",
                     "8", "23", "10", "5",
                     "24", "16", "33", "20",
                     "17", "14", "31", "9",
                     "22", "18", "29", "7",
                     "28", "12", "35", "3", "26"];

  var startAngle = 0;
  var arc = Math.PI / 32;
  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 < 32; 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();
</script>

我的代码中包含了所有的数字和颜色（绿色，黑色，红色），但我不明白为什么它会显示半圆形的轮子并且所有的数字都像这样被扰乱！

另外，还有一个深蓝色的颜色显示在轮子中的某些数字，我不明白它来自哪里！

有人可以就此问题提出建议吗？

提前致谢

Answer 1

Math.PI是180度 - 所以为了得到一个完整的圆，你必须使用2 * Math.PI

轮盘赌使用HTML5？

1 个答案: