我有tikz一个由外部软件（Inkscape、svg2tikz 导出）生成的路径。
\documentclass[
tikz,
border = 2mm
]
{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[
y = 0.80pt,
x = 0.80pt,
yscale = -1,
xscale = 1,
]
\path[
draw = black,
line width = 2mm
]
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.. (296.3182,1019.8787) .. controls (286.1156,1021.7304) and
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.. controls (214.5835,1023.5810) and (210.1897,1022.9433) ..
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and (997.9201,334.9425) .. (1004.3613,335.7882) .. controls
(1005.8246,335.9804) and (1007.4153,337.0847) .. (1008.1937,338.1835) ..
controls (1008.7726,339.0009) and (1008.4901,340.4179) .. (1008.4333,341.5369)
.. controls (1006.1748,386.0080) and (1004.0656,430.5328) ..
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.. (967.9532,594.7173) .. controls (952.1820,628.3722) and (936.8982,662.6058)
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.. (912.1434,701.5465) .. controls (904.8825,705.9837) and (896.6385,709.1785)
.. (889.6278,713.7624) .. controls (888.3348,714.6078) and (887.3808,716.3515)
.. (887.2326,717.8344) .. controls (886.9818,720.3437) and (887.1015,723.4629)
.. (888.4302,725.7388) .. controls (896.8424,740.1499) and (907.4299,753.6924)
.. (916.4549,767.8956) .. controls (917.1708,769.0222) and (917.7919,770.5664)
.. (917.6525,771.7280) .. controls (917.5527,772.5625) and (916.6032,773.4728)
.. (915.7362,773.8838) .. controls (882.7501,789.5212) and (849.1049,804.1849)
.. (816.0929,819.8730) .. controls (813.6548,821.0317) and (811.5213,822.7699)
.. (809.3862,824.4241) .. controls (793.7963,836.5027) and (778.4697,848.9366)
.. (762.9178,861.0718) .. controls (757.3912,865.3842) and (751.5932,869.3566)
.. (746.1509,873.7667) .. controls (742.3314,876.8618) and (738.5935,880.0979)
.. (735.1327,883.5873) .. controls (728.9326,889.8386) and (723.4611,896.8436)
.. (717.1681,902.9890) .. controls (713.2413,906.8238) and (709.0030,910.5452)
.. (704.4732,913.5282) .. controls (702.4560,914.8567) and (699.9065,915.4246)
.. (697.5268,915.9235) .. controls (694.9563,916.4625) and (692.2441,916.7561)
.. (689.6225,916.6421) .. controls (686.7350,916.5168) and (683.6774,916.2140)
.. (680.9995,915.2050) .. controls (678.1681,914.1381) and (675.7551,911.9683)
.. (673.0951,910.4144) .. controls (667.6911,907.2576) and (662.4040,903.7847)
.. (656.8072,901.0728) .. controls (654.6593,900.0321) and (652.2196,899.4318)
.. (649.8609,899.1566) .. controls (647.4291,898.8728) and (644.8874,899.1149)
.. (642.4356,899.3962) .. controls (640.0170,899.6740) and (637.6010,900.1804)
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.. (616.5666,906.5821) .. controls (614.5944,907.3046) and (612.7106,908.4243)
.. (611.0575,909.6959) .. controls (609.5967,910.8196) and (608.2651,912.2449)
.. (607.2250,913.7679) .. controls (606.0296,915.5184) and (605.3498,917.6218)
.. (604.3507,919.5166) .. controls (603.0344,922.0131) and (601.8091,924.5809)
.. (600.2787,926.9419) .. controls (599.0146,928.8923) and (597.7090,930.9532)
.. (595.9672,932.4511) .. controls (593.7168,934.3864) and (590.9013,935.7215)
.. (588.3024,937.2416) .. controls (586.6697,938.1966) and (585.0801,939.4546)
.. (583.2723,939.8764) .. controls (580.2895,940.5724) and (577.0451,940.5485)
.. (573.9308,940.5950) .. controls (571.6957,940.6273) and (569.3062,940.7987)
.. (567.2240,940.1159) .. controls (564.4358,939.2018) and (561.8778,937.3695)
.. (559.3196,935.8045) .. controls (555.0912,933.2177) and (551.2252,929.9199)
.. (546.8641,927.6605) .. controls (544.5983,926.4867) and (541.9613,925.7376)
.. (539.4388,925.5048) .. controls (536.7716,925.2586) and (533.8744,925.4262)
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.. (437.4002,959.7572) .. controls (423.2637,967.1663) and (408.6889,973.8815)
.. (394.7642,981.5542) .. controls (393.0397,982.5044) and (391.4734,984.0683)
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.. (390.2131,988.5004) .. controls (389.5653,989.8959) and (388.6932,991.5542)
.. (387.3388,992.3329) .. controls (382.3058,995.2269) and (376.0275,996.6104)
.. (371.0510,999.5187) .. controls (369.8796,1000.2033) and
(369.1546,1001.6530) .. (369.0704,1003.0883) .. controls (369.0341,1003.7061)
and (369.1149,1004.2761) .. (369.0237,1004.8643) .. controls
(368.8174,1006.1932) and (367.4525,1007.4004) .. (366.2604,1007.6627) ..
controls (355.4761,1010.0352) and (344.0335,1010.9993) .. (332.9661,1012.9323)
-- cycle;
\end{tikzpicture}
\end{document}
问题
我想要一种颜色渐变有一个急剧转变。它不必是渐变的 - 我只想为路径的特定部分涂上不同的颜色。正如@cfr 在评论中提到的，它可能是两条颜色不同的路径，彼此叠在一起。
这是一个穷人的例证：
正如您所见，我想控制路径中被着色的部分。
替代路径（分段）
我成功生成了分段路径（100 条独立路径）。缺点是，您会看到细小的边界（取决于缩放级别）。
代码如下：http://pastebin.com/L3zTxzn0（因为字符数限制）。
有关的
- 我也在寻找（备份）Inkscape 解决方案，请参阅这里。在这里，我想到了一个想法，要有一个自定义的划线图案，它有一个非常大的划线笔划（见https://jakearchibald.com/2013/animated-line-drawing-svg/）。
- 这个问题与我的问题相关从昨天。理想情况下，我会根据演示进度来控制分数（0% 到 100%）。
- TikZ 中的路径跟随颜色渐变（看起来很复杂，也许现在有一个更优雅的解决方案）
答案1
这基本上与Manuel Kuehner 博士的回答但说明了如何将 svg 路径直接输入到 TikZ 中（请注意，建议确保数字之间有空格）并使用postaction一次性完成绘图：
\documentclass[tikz,border=5]{standalone}
\usetikzlibrary{svg.path,decorations}
\makeatletter
\tikzset{%
get path length/.code={%
\tikz@addoption{%
\pgfgetpath\tikz@tmppath%
\pgfprocessround\tikz@tmppath\tikz@tmppath%
\pgf@decorate@parsesoftpath\tikz@tmppath\tikz@discard%
\global\let#1=\pgf@decorate@totalpathlength%
}%
}
}
\tikzset{dashed path/.style={
get path length=\pathlength,
draw=black,
line width=5,
postaction={
draw=red,
line width=5,
dash pattern=on \pathlength/100*#1 off \pathlength/100*(100-#1),
}
}}
\begin{document}
\foreach \i in {0,5,...,100}{
\begin{tikzpicture}
\draw [dashed path=\i] svg {
M62.9 14.9 c-25 -7.74 -56.6 4.8 -60.4 24.3 -3.73 19.6 21.6 35
39.6 37.6 42.8 6.2 72.9 -53.4 116 -58.9 65 -18.2 191 101 215
28.8 5 -16.7 -7 -49.1 -34 -44 -34 11.5 -31 46.5-14 69.3 9.38
12.6 24.2 20.6 39.8 22.9 91.4 9.05 102 -98.9 176 -86.7 18.8
3.81 33 17.3 36.7 34.6 2.01 10. 2.124 21.1 -5.18 30.1
};
\end{tikzpicture}
}
\end{document}
答案2
灵感来自https://graphicdesign.stackexchange.com/questions/82671（这是我在另一个 stackexchange 服务器上提出的问题之一）我使用了一个自定义虚线图案使用非常大的值来获得所需的效果：
\begin{tikzpicture}[
y = 0.80pt,
x = 0.80pt,
yscale = -1,
xscale = 1,
dash pattern = on 1500pt off 3000pt % <-- here the magic happens
]
.
.
.
到确定路径长度我使用了 Inkscape。但也有我如何访问“\pgfdecoratedpathlength”的值以供稍后在文档中使用？可以工作（只要尺寸不是太大）。
\documentclass[
tikz,
border = 2mm
]
{standalone}
\usepackage{tikz}
\usepackage{calc}
\begin{document}
\begin{tikzpicture}[
y = 1pt,
x = 1pt,
yscale = -1,
xscale = 1,
]
% Path 1 | Black | Background Level
\path[
draw = black,
line width = 2mm
]
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.. (296.3182,1019.8787) .. controls (286.1156,1021.7304) and
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and (769.0562,391.5041) .. (773.6964,390.1611) .. controls (818.1593,377.2921)
and (862.8834,365.1221) .. (907.5922,353.0343) .. controls (930.5099,346.8381)
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(1005.8246,335.9804) and (1007.4153,337.0847) .. (1008.1937,338.1835) ..
controls (1008.7726,339.0009) and (1008.4901,340.4179) .. (1008.4333,341.5369)
.. controls (1006.1748,386.0080) and (1004.0656,430.5328) ..
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.. (999.3313,485.0138) .. controls (990.9360,517.0031) and (982.5528,549.0430)
.. (973.4624,580.8247) .. controls (972.0934,585.6108) and (970.0666,590.2075)
.. (967.9532,594.7173) .. controls (952.1820,628.3722) and (936.8982,662.6058)
.. (919.8082,695.3188) .. controls (918.2949,698.2156) and (914.9428,699.8358)
.. (912.1434,701.5465) .. controls (904.8825,705.9837) and (896.6385,709.1785)
.. (889.6278,713.7624) .. controls (888.3348,714.6078) and (887.3808,716.3515)
.. (887.2326,717.8344) .. controls (886.9818,720.3437) and (887.1015,723.4629)
.. (888.4302,725.7388) .. controls (896.8424,740.1499) and (907.4299,753.6924)
.. (916.4549,767.8956) .. controls (917.1708,769.0222) and (917.7919,770.5664)
.. (917.6525,771.7280) .. controls (917.5527,772.5625) and (916.6032,773.4728)
.. (915.7362,773.8838) .. controls (882.7501,789.5212) and (849.1049,804.1849)
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.. (607.2250,913.7679) .. controls (606.0296,915.5184) and (605.3498,917.6218)
.. (604.3507,919.5166) .. controls (603.0344,922.0131) and (601.8091,924.5809)
.. (600.2787,926.9419) .. controls (599.0146,928.8923) and (597.7090,930.9532)
.. (595.9672,932.4511) .. controls (593.7168,934.3864) and (590.9013,935.7215)
.. (588.3024,937.2416) .. controls (586.6697,938.1966) and (585.0801,939.4546)
.. (583.2723,939.8764) .. controls (580.2895,940.5724) and (577.0451,940.5485)
.. (573.9308,940.5950) .. controls (571.6957,940.6273) and (569.3062,940.7987)
.. (567.2240,940.1159) .. controls (564.4358,939.2018) and (561.8778,937.3695)
.. (559.3196,935.8045) .. controls (555.0912,933.2177) and (551.2252,929.9199)
.. (546.8641,927.6605) .. controls (544.5983,926.4867) and (541.9613,925.7376)
.. (539.4388,925.5048) .. controls (536.7716,925.2586) and (533.8744,925.4262)
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.. (513.0908,933.6487) .. controls (507.1120,935.8121) and (501.0147,937.7261)
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.. (486.7427,940.8345) .. controls (483.2532,941.1029) and (479.6770,940.5014)
.. (476.2036,940.8345) .. controls (473.8485,941.0605) and (471.3883,941.4720)
.. (469.2573,942.5112) .. controls (458.4538,947.7796) and (448.0947,954.1520)
.. (437.4002,959.7572) .. controls (423.2637,967.1663) and (408.6889,973.8815)
.. (394.7642,981.5542) .. controls (393.0397,982.5044) and (391.4734,984.0683)
.. (390.4528,985.6261) .. controls (389.9564,986.3838) and (390.6033,987.6603)
.. (390.2131,988.5004) .. controls (389.5653,989.8959) and (388.6932,991.5542)
.. (387.3388,992.3329) .. controls (382.3058,995.2269) and (376.0275,996.6104)
.. (371.0510,999.5187) .. controls (369.8796,1000.2033) and
(369.1546,1001.6530) .. (369.0704,1003.0883) .. controls (369.0341,1003.7061)
and (369.1149,1004.2761) .. (369.0237,1004.8643) .. controls
(368.8174,1006.1932) and (367.4525,1007.4004) .. (366.2604,1007.6627) ..
controls (355.4761,1010.0352) and (344.0335,1010.9993) .. (332.9661,1012.9323)
-- cycle;
% Path 2 | Red | Top Level | Line Width is Bigger
\path[
draw = red,
line width = 3mm,
dash pattern = on (12*1/100*2692pt) off 2692pt
]
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.. controls (214.5835,1023.5810) and (210.1897,1022.9433) ..
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.. (371.0510,999.5187) .. controls (369.8796,1000.2033) and
(369.1546,1001.6530) .. (369.0704,1003.0883) .. controls (369.0341,1003.7061)
and (369.1149,1004.2761) .. (369.0237,1004.8643) .. controls
(368.8174,1006.1932) and (367.4525,1007.4004) .. (366.2604,1007.6627) ..
controls (355.4761,1010.0352) and (344.0335,1010.9993) .. (332.9661,1012.9323)
-- cycle;
\end{tikzpicture}
\end{document}
线路
dash pattern = on (12*1/100*2692pt) off 2692pt % --> 12 % of the path black path length
很重要。使用该calc包我可以控制红色路径的比例。上面的线中有 12% 是红色的2692 pt。我使用 Inkscape 功能获得了路径长度（奇怪的是，导出功能将所有内容缩放到 0.8 - 我将其改回使用y = 1pt, x = 1pt而不是y = 0.8pt, x = 0.8pt）。Inkscape 是一款免费的矢量图形软件。
1%
12%
50%
99%
100％的
也许有人可以生成一个很酷的动画 GIF 来显示 1% 到 100% :)。