HTML5 Canvas ctx.fill（）在笔触区域之外填充

Question

bounty过期在2小时内。该问题的答案有资格获得+ 50声望赏金。Ilker Kadir Ozturk想要引起更多关注对此问题。

我正在使用虚拟天空库https://github.com/slowe/VirtualSky。图书馆试图展示天空的视觉表现。该库基于html canvas构建。在原始代码中，银河线用ctx.stroke()绘制为一条线，并且一切正常。我尝试添加ctx.fill()填充银河区域，但对于某些坐标/日期，画布填充了描边区域之外。我添加了代表问题的两个图像。在填充版本中，请注意，它也填充了银河系以外的其他区域。我在这个问题上花了很多时间，但无法弄清楚为什么画布会填满绘制区域之外的地方。

没有ctx.fill（）

---

使用ctx.fill（）

---

这里是绘制银河系的代码：

VirtualSky.prototype.drawGalaxy = function(colour){
    if(!this.galaxy || !this.showgalaxy) return this;
    if(!colour) colour = this.col.galaxy;
    this.ctx.beginPath();
    this.ctx.strokeStyle = colour;
    this.ctx.fillStyle = "rgba(255,255,255,0.4)";
    this.ctx.lineWidth = (this.gal.lineWidth || 0.75);
    this.ctx.lineJoin = "round";
    var p,pa,pb,i,c,maxl,dx,dy;
    maxl = this.maxLine(5);

    for(c = 0; c < this.galaxy.length; c++){

        // We will convert all the galaxy outline coordinates to radians
        if(!this.gal.processed){
            for(i = 1; i < this.galaxy[c].length; i++) this.galaxy[c][i] *= this.d2r;
        }

        // Get a copy of the current shape
        p = this.galaxy[c].slice(0);

        // Get the colour (first element)
        p.shift();
        // Set the initial point to null
        pa = null;

        // Now loop over joining the points
        for(i = 0; i < p.length; i+=2){
            pb = this.radec2xy(p[i], p[i+1]);
            if(i==0) this.ctx.moveTo(pb.x,pb.y);
            else{
                dx = Math.abs(pa.x-pb.x);
                dy = Math.abs(pa.y-pb.y);
                if(!isNaN(dx) && !isNaN(dy)){
                    // Basic error checking: if the line is very long we need to normalize to other side of sky
                    if(dx >= maxl || dy >= maxl) this.ctx.moveTo(pb.x,pb.y);
                    this.ctx.lineTo(pb.x,pb.y);
                }else{
                    this.ctx.moveTo(pb.x,pb.y);
                }
            }
            pa = pb;
        }
    }
    // We've converted the galaxy to radians
    this.gal.processed = true;
    this.ctx.stroke();

    this.ctx.fill();

//  I added this ctx.fill() here which causes the problem.

    return this;
};

银河系的Json数据

{
  "galaxy": [
    ["#396bad", 254.1778, -21.5124, 253.6146, -22.5310, 253.2638, -27.7008, 251.9368, -29.7742, 249.7919, -29.7867, 247.8000, -28.4406, 246.5570, -26.9571, 244.6278, -25.8787, 242.5067, -26.0070, 241.5945, -25.3687, 240.7208, -23.0525, 239.5973, -22.3533, 238.6863, -23.5322, 238.7180, -25.7313, 239.4131, -28.0723, 238.6475, -30.8747, 239.9512, -34.4963, 240.4545, -37.0030, 238.8220, -39.1709, 235.6101, -41.6744, 234.5926, -42.9833, 235.6221, -44.6917, 235.5743, -46.4283, 232.6913, -48.4186, 228.3087, -49.7552, 225.9823, -50.6267, 221.4249, -52.5289, 216.0338, -54.6596, 209.0229, -55.3209, 202.9102, -56.0362, 196.2626, -56.3616, 191.7337, -57.1169, 184.7426, -59.1857, 180.5514, -58.8402, 175.1997, -58.5802, 170.6339, -57.6749, 168.3549, -56.2380, 163.3607, -54.7001, 159.2106, -51.3301, 154.8495, -47.2975, 150.0574, -45.2411, 146.8211, -44.7221, 145.5418, -45.4794, 145.6709, -46.1571, 149.5391, -48.3145, 150.7915, -49.6707, 150.0747, -51.0247, 147.4159, -49.8497, 144.3472, -47.8592, 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-22.8788, 265.0658, -21.1691, 265.8074, -19.4150, 266.6842, -18.7916, 268.0278, -18.7995, 268.7521, -17.4910, 268.3084, -15.3906, 266.9707, -13.3787, 264.9872, -12.4603, 262.4372, -12.2113, 260.5499, -13.2122, 258.4769, -14.8956, 256.1174, -16.7507, 254.4650, -18.3043, 253.6343, -20.3552, 254.1778, -21.5124, 254.1778, -21.5124, 254.1778, -21.5124],
    ["#396bad", 257.4284, -35.0782, 258.7567, -34.6776, 259.6113, -33.6806, 259.9750, -32.7946, 260.9776, -32.5946, 263.4189, -33.7211, 265.2841, -35.1551, 267.0684, -37.0106, 266.5317, -38.4758, 264.8234, -39.1661, 263.0403, -38.8168, 260.6629, -38.1140, 258.3247, -38.4735, 255.5110, -38.1878, 254.0470, -37.3602, 253.5295, -36.1222, 253.7763, -35.4603, 254.7476, -35.1875, 256.2938, -35.0264, 257.4284, -35.0782, 257.4284, -35.0782, 257.4284, -35.0782],
    ["#396bad", 254.4847, -39.5230, 255.2762, -39.2671, 257.3657, -39.9243, 258.7042, -41.3823, 258.3749, -43.2682, 257.0644, -43.3665, 254.3218, -40.8215, 254.6242, -40.4285, 254.4847, -39.5230, 254.4847, -39.5230, 254.4847, -39.5230],
    ["#396bad", 247.9505, -43.8132, 247.7714, -42.7233, 248.2105, -41.7101, 249.7280, -40.8373, 248.8720, -37.3180, 247.1054, -36.2799, 245.6020, -36.7984, 243.1195, -35.6949, 242.2253, -36.0340, 241.9943, -38.6050, 241.6221, -40.6326, 239.8163, -43.0489, 238.8334, -44.6762, 238.5119, -46.8016, 237.7857, -49.0401, 236.8718, -50.6695, 237.0713, -52.3828, 238.9693, -53.2821, 241.4236, -52.3398, 244.7950, -51.3601, 248.9798, -51.6343, 253.4436, -51.0624, 257.8767, -50.6966, 260.9423, -50.2581, 261.6140, -49.2459, 260.7624, -46.4869, 260.5888, -45.3986, 259.8614, -44.8904, 257.7870, -44.9484, 256.1962, -45.7995, 256.3613, -48.5425, 253.5419, -49.9573, 249.8040, -49.5087, 248.3220, -49.4156, 245.7227, -48.7635, 244.6261, -48.0299, 245.6396, -46.7119, 247.9407, -46.1849, 251.5170, -45.7312, 252.8143, -45.1508, 251.9638, -44.5626, 249.5206, -44.4962, 247.9505, -43.8132, 247.9505, -43.8132, 247.9505, -43.8132],
    ["#396bad", 231.8281, -52.4833, 233.5614, -52.5365, 234.4273, -52.7145, 236.0044, -53.8647, 236.5304, -55.8352, 237.3389, -57.1286, 230.3741, -58.8315, 226.4955, -59.1351, 221.0867, -60.4628, 220.9820, -59.2769, 221.7242, -59.0271, 223.2728, -57.1869, 226.5641, -55.0286, 228.1040, -54.5097, 229.9674, -52.9922, 231.8281, -52.4833, 231.8281, -52.4833, 231.8281, -52.4833],
    ["#396bad", 191.9931, -60.9308, 195.0383, -60.9157, 197.2513, -61.5730, 197.6589, -63.3081, 193.3910, -65.2609, 190.6198, -65.3102, 189.1651, -65.7997, 187.9019, -65.8296, 187.4866, -64.7787, 188.0292, -64.2788, 187.2718, -63.6037, 188.0759, -62.2722, 190.6559, -61.1093, 191.9931, -60.9308, 191.9931, -60.9308],
    ["#396bad", 132.7337, -37.5805, 133.0861, -38.9333, 132.3284, -39.7468, 129.7569, -39.4258, 127.1207, -38.0660, 124.9328, -36.1447, 124.8899, -34.6079, 124.7196, -32.9119, 125.9376, -32.1253, 127.3543, -32.6954, 128.6915, -33.7875, 129.6263, -35.1366, 131.7847, -36.5415, 132.7337, -37.5805, 132.7337, -37.5805],
    ["#396bad", 121.1825, -39.3994, 119.9070, -39.0295, 119.2840, -37.6001, 119.3245, -36.1550, 117.3621, -34.3430, 116.3134, -31.1424, 115.5167, -28.5014, 115.3112, -26.0891, 115.8367, -24.7060, 117.0334, -24.5218, 117.8897, -25.7087, 118.5145, -28.1509, 119.6664, -31.5362, 121.7083, -34.8713, 122.3366, -37.4519, 122.1419, -39.0037, 121.1825, -39.3994, 121.1825, -39.3994],
    ["#396bad", 305.9982, 40.1858, 309.8895, 39.3472, 311.2759, 37.2754, 311.2100, 35.4356, 310.1900, 34.7837, 308.6971, 34.9849, 307.5461, 36.5500, 305.0697, 37.7876, 304.5142, 39.0978, 305.1288, 40.0209, 305.9982, 40.1858]
  ]
}

Answer 1

正如已经说过的那样，可能来自您的数据。一种容易检查其完整性的方法是在每个点位置绘制一个小矩形。

这样可以避免检查每个数字。

我希望它有所帮助。

Answer 2

编写了一个小脚本来查找坐标中的任何跳跃。输出：

Diff found at 342 with newX:   4.3035 and newY: 46.2481 and oldX:359.592 and oldY: 46.1929
Diff found at 624 with newX: 355.2714 and newY: 64.426  and oldX: 0.2476 and oldY: 66.2511

因此，您需要在342和624之间的所有x值中加上360。您可以在此处查看其演示：https://jsfiddle.net/MisteriosM/18s0cpmq/43/

不幸的是，我不知道您的绘画代码，所以我不知道这是否真的解决了您的问题。您应该对其进行更新，以便将来可以使用循环坐标。

如果您很懒，并且添加了它，那么这是固定的第一行（带有js舍入错误）：

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function diff(a, b) {
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}

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var canvas = document.getElementById("result");
ctx = canvas.getContext("2d");

var counter = 0;
var prevX = 254.1778;
var prevY = -21.5124;
var newX, newY;
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for (j = 0; j < 1 /*obj.galaxy.length*/ ; j++) {
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