HTML5 Canvas ctx.fill() 填充描边区域外答案

【问题标题】：HTML5 Canvas ctx.fill() fills outside the stroke areaHTML5 Canvas ctx.fill() 填充描边区域外
【发布时间】：2020-05-24 16:00:42
【问题描述】：

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。该库建立在 html 画布上。在原始代码中，银河系用ctx.stroke() 绘制成一条线，一切正常。我尝试添加ctx.fill() 来填充银河区域，但对于某些坐标/日期，画布填充在描边区域之外。我添加了代表问题的两个图像。在填充版本中，请注意它还填充了银河线以外的其他一些区域。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充到绘制区域之外。

没有 ctx.fill()

使用 ctx.fill()

这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, 142.7713, -47.5886, 142.7304, -48.1825, 141.8590, -48.7921, 143.8702, -51.7563, 146.7533, -53.8733, 146.7337, -54.7900, 145.4937, -55.0315, 136.3994, -53.7185, 133.1890, -53.9932, 132.3952, -55.2722, 133.9782, -56.3603, 137.5581, -56.8447, 142.3823, -56.7640, 147.1253, -56.7384, 149.2668, -57.3424, 151.0831, -57.4354, 153.9265, -58.4216, 157.9421, -58.9774, 159.0422, -59.6771, 157.5067, -60.3507, 155.1830, -59.7783, 151.9601, -59.2083, 149.2887, -59.3163, 148.3379, -59.9243, 149.9157, -61.4340, 154.0475, -62.1249, 155.9994, -62.2575, 159.2582, -63.5263, 165.5091, -63.4204, 167.1619, -62.8290, 170.1596, -61.3662, 172.9661, -61.4156, 176.0518, -62.9133, 179.3437, -64.2607, 181.9387, -65.3282, 184.3779, -69.3924, 188.2568, -70.9570, 194.7347, -71.2607, 199.7570, -70.2394, 204.1730, -68.8427, 209.0938, -67.8511, 216.7510, -68.0095, 221.9748, -67.1396, 227.5494, -66.2461, 234.5158, -64.3854, 240.5233, -61.8468, 244.0983, -60.4173, 251.3801, -59.1124, 253.2926, -57.4685, 254.7774, -56.3244, 261.4819, -54.4899, 265.8676, -50.8482, 268.8085, -48.0793, 269.9543, -46.3469, 270.5405, -43.6313, 270.6492, -42.3809, 271.0668, -41.1083, 273.1271, -38.6387, 274.8287, -36.5477, 276.5511, -33.8477, 275.4040, -33.1596, 275.2727, -30.5290, 276.8968, -28.1703, 277.9533, -25.4297, 278.6386, -22.3113, 279.4081, -19.7351, 280.9230, -17.4472, 281.9964, -15.6719, 282.8788, -13.6664, 283.3409, -11.0282, 284.5659, -8.4787, 285.8740, -5.6156, 287.7313, -3.1057, 289.7038, -1.0941, 290.4044, -0.0164, 290.7342, 1.1813, 291.9363, 0.4122, 292.8626, 0.7917, 295.5690, 0.8033, 297.0695, 1.1497, 297.0874, 2.1407, 295.9694, 2.3815, 294.6764, 2.5679, 294.4415, 3.7745, 295.0541, 5.1814, 296.9021, 5.9879, 297.7330, 6.5454, 297.6053, 8.4351, 298.6240, 10.2040, 298.1628, 13.5562, 299.1257, 15.5289, 302.8713, 15.4981, 305.5156, 16.1286, 308.1366, 16.6469, 308.7496, 18.5262, 307.5513, 19.8431, 307.7080, 20.7394, 309.0176, 21.5802, 308.7945, 23.5149, 309.4605, 24.2478, 310.5891, 24.9863, 310.3480, 26.0982, 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355.2714, 64.4260, 350.1006, 62.9385, 344.4302, 62.4847, 339.3002, 60.4931, 333.4702, 58.8851, 331.1327, 59.4605, 330.9382, 61.9623, 340.6152, 65.1092, 343.2879, 66.7647, 343.3581, 70.1643, 341.1773, 70.8790, 336.6449, 73.1299, 333.5813, 75.1391, 324.6186, 76.5981, 322.6315, 75.9427, 319.0891, 73.7015, 314.8850, 71.0639, 315.6348, 68.7048, 315.4588, 66.8973, 313.0831, 64.8622, 312.0635, 62.5880, 314.0142, 60.2312, 313.6305, 59.4861, 311.8591, 59.3915, 309.8048, 58.5233, 310.2041, 57.1819, 306.9144, 55.9804, 304.6804, 54.7702, 305.2319, 53.7273, 307.7332, 52.9357, 308.4628, 52.2243, 308.0011, 51.7205, 306.5029, 51.7495, 304.1552, 50.3598, 302.5798, 48.5193, 302.1408, 47.1988, 300.7148, 46.6004, 299.0278, 47.0595, 297.2437, 46.8711, 295.7553, 46.0584, 294.7485, 44.4314, 292.7755, 41.4764, 288.6933, 39.1997, 287.4471, 37.8510, 287.5118, 36.7221, 289.2538, 36.0606, 290.9985, 36.0011, 292.6594, 35.2362, 292.3950, 34.1260, 291.2070, 33.2023, 288.4240, 33.0160, 287.0090, 32.3231, 286.5059, 31.2666, 287.0896, 29.6223, 286.5820, 27.3683, 285.1771, 25.5062, 283.1010, 23.9449, 281.0469, 22.8010, 279.4373, 21.4068, 279.1821, 19.6473, 279.7551, 18.2109, 280.9496, 17.7421, 282.6220, 17.1833, 283.2966, 16.1546, 283.0965, 15.0372, 281.5283, 14.0053, 280.0909, 12.9151, 278.6961, 11.5975, 277.0707, 10.5385, 275.4225, 9.5688, 273.4622, 8.5487, 270.9916, 7.3738, 269.3157, 5.7621, 268.8705, 4.4507, 269.5389, 3.1987, 271.0927, 2.6855, 273.2811, 2.5608, 275.4739, 3.3006, 278.1912, 5.0780, 281.9090, 8.5271, 284.1697, 11.3576, 286.2251, 14.0132, 286.3233, 15.1915, 286.1158, 15.5100, 285.7599, 16.6912, 286.7631, 18.2914, 287.1951, 19.3787, 286.9849, 20.8446, 289.3257, 22.5391, 291.9464, 25.4127, 292.4286, 28.5332, 293.4593, 30.5996, 297.2230, 32.4772, 299.7133, 35.0595, 303.4745, 35.0807, 304.1266, 34.0245, 303.6819, 30.3270, 300.8895, 28.8322, 296.8912, 28.3993, 294.9144, 27.6937, 294.5657, 26.6140, 296.1041, 25.9037, 297.3739, 25.6845, 297.8246, 24.4710, 295.9400, 22.7956, 293.0649, 21.4866, 291.1229, 20.8588, 290.3240, 19.7277, 290.6364, 18.7692, 292.0849, 18.3219, 293.1902, 17.8198, 293.1968, 16.4933, 292.2117, 15.0311, 290.2679, 13.8513, 288.7569, 12.5900, 288.6076, 10.9218, 288.7328, 9.7665, 287.2839, 8.8429, 285.5820, 8.1189, 284.2910, 7.0396, 283.2366, 5.8411, 282.9327, 3.8283, 282.5522, 3.2275, 280.8435, 2.7268, 279.3674, 2.2532, 278.3224, 1.3453, 278.2314, 0.7429, 279.1609, 1.5654, 279.5029, 0.9574, 279.8970, -0.2562, 281.6814, -0.8823, 283.4665, -1.5073, 284.0658, -2.4642, 282.9599, -3.4894, 281.1068, -3.6991, 279.0490, -4.0172, 278.1079, -5.1256, 278.2582, -6.7990, 279.0976, -9.4057, 278.6578, -11.6460, 277.3170, -14.1578, 276.1600, -16.6976, 275.8960, -19.1108, 275.5302, -21.8370, 274.9452, -24.2398, 272.9984, -26.4299, 270.0613, -28.0668, 268.2229, -29.8114, 268.5228, -30.2623, 267.9381, -32.1320, 267.1568, -33.2373, 265.0719, -33.6050, 262.2933, -32.3327, 261.2061, -30.0066, 261.2532, -27.8653, 261.7517, -26.3868, 262.0161, -24.8538, 263.5809, -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]
  ]
}

【问题讨论】：

因为你的路坏了。检查您的数据的完整性，我们无法为您做任何事情。
> // Basic error checking: if the line is very long we need to normalize to other side of sky 您是否尝试过暂时删除此规范化？看起来the other side of the sky 中的路径中有一个不应该存在的点。
分享用于绘制路径的实际数据。
@extempl 我添加了数据文件。我之前尝试过删除规范化线，它对某些坐标/日期有帮助，但对其他坐标/日期没有帮助。
@Kaiido 是的，这可能是问题所在，但为什么仅使用 ctx.stroke 正确绘制路径

标签： javascript html canvas html5-canvas

【解决方案1】：

正如已经说过的那样，这可能来自您的数据。轻松检查其完整性的一种方法是在每个点位置绘制一个小矩形。

这样你可以避免检查每一个数字。

【讨论】：

【解决方案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，您需要将 360 添加到 342 和 624 之间的所有 x 值。你可以在这里看到它的演示：https://jsfiddle.net/MisteriosM/18s0cpmq/43/

很遗憾，我不知道这是否真的能解决您的问题，因为我不知道您的绘图代码。您应该更新它以便将来能够使用循环坐标。

如果你是 Lazy 并且添加它有效，这里是修复的第一行（带有 js 舍入错误）：

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function diff(a, b) {
    return Math.abs(a - b);
}

const obj = JSON.parse(json);
var canvas = document.getElementById("result");
ctx = canvas.getContext("2d");

var counter = 0;
var prevX = 254.1778;
var prevY = -21.5124;
var newX, newY;
for (var i = 0; i < 1 /*obj.galaxy.length*/ ; i++) {
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    while (obj.galaxy[i][1 + counter + 2] <= obj.galaxy[i].length) {
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        newY = obj.galaxy[i][2 + counter];
        ctx.lineTo(newX, newY + 100);
        if (diff(newX, prevX) > 10 || diff(newY, prevY) > 10) {
            console.log("Diff found at " + counter + " with newX: " + newX + "and newY: " + newY + " and oldX: " + prevX + "and oldY: " + prevY);
        }
        prevX = newX;
        prevY = newY;
        counter += 2;

    }
    ctx.fill();
}



for (j = 0; j < 1 /*obj.galaxy.length*/ ; j++) {
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    ctx.fillStyle = "red";
    counter = 0;
    while (obj.galaxy[j][1 + counter + 2] <= obj.galaxy[j].length) {
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        newY = obj.galaxy[j][2 + counter];
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    ctx.fill();
}

for (j = 0; j < 1 /*obj.galaxy.length*/ ; j++) {
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    while (obj.galaxy[j][1 + counter + 2] <= obj.galaxy[j].length) {
        if (counter >= 342 && counter < 624) obj.galaxy[j][1 + counter] += 360;
        counter += 2;
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    console.log(JSON.stringify(obj.galaxy[0]));
}

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