在不使用外部服务的情况下在设备上将 geoJSON 转换为 SVG
Convert geoJSON to SVG on device without using external service
上下文：需要在列表 UI 中将用户的行进路径显示为 SVG。（应该离线工作）
输入：geoJSON，用户移动坐标列表为 'LineString' 几何。
const geoJsonData = {
type: 'FeatureCollection',
features: [
{
geometry: {
type: 'LineString',
coordinates: [
[77.601923, 13.054111],
[77.602046, 13.054097],
[77.601984, 13.054261],
[77.601954, 13.055172],
[77.601861, 13.055171],
[77.601613, 13.055162],
[77.601534, 13.055159],
[77.601223, 13.055148],
[77.600907, 13.055136],
[77.60085, 13.055134],
[77.600585, 13.055125],
[77.600492, 13.055122],
[77.600256, 13.055113],
[77.600144, 13.055116],
[77.599887, 13.055124],
[77.599678, 13.05515],
[77.599419, 13.055186],
[77.599237, 13.055262],
[77.599059, 13.055332],
[77.598979, 13.055365],
[77.598696, 13.055528],
[77.598316, 13.055735],
[77.597942, 13.055909],
[77.597914, 13.055993],
[77.597911, 13.056119],
[77.597979, 13.056299],
[77.598195, 13.056721],
[77.59833, 13.057012],
],
},
type: 'Feature',
properties: {
description: 'Southern Ave',
lines: ['Green'],
},
},
],
};
问题：生成的 SVG 路径未绘制预期的线。
预期结果：我尝试使用 Aspose 在线转换器服务，此服务给我正确的结果。
link : https://products.aspose.app/gis/viewer/geojson-to-svg
\Result :```<path d="m771.5 575.78l23.5 2.68-11.85-31.33-5.73-174.05-17.76.19-47.39 1.72-15.09.57-59.42 2.1-60.37 2.3-10.89.38-50.63 1.72-17.76.57-45.09 1.72-21.4-.57-49.1-1.53-39.93-4.97-49.48-6.88-34.78-14.52-34-13.37-15.29-6.31-54.06-31.14-72.6-39.54-71.46-33.25-5.35-16.05-.57-24.07 12.99-34.39 41.27-80.62 25.79-55.6"></path>```
enter image description here
尝试过的解决方案：
geojson2svg (https://github.com/gagan-bansal/geojson2svg)
var converter = geojson2svg({
viewportSize: {width: 200, height: 300},
output: 'svg',
});
const svgStr = converter.convert(geoJsonData);
\Result: <path d="M100.00038728329726,99.99993485162537 100.00038728391112,99.99993485169524 100.0003872836017,99.99993485087678 100.00038728345197,99.9999348463303 100.00038728298784,99.9999348463353 100.00038728175016,99.9999348463802 100.00038728135591,99.99993484639519 100.00038727980382,99.99993484645007 100.00038727822678,99.99993484650997 100.00038727794231,99.99993484651996 100.00038727661978,99.99993484656486 100.00038727615566,99.99993484657985 100.00038727497787,99.99993484662475 100.00038727441891,99.99993484660978 100.00038727313631,99.99993484656986 100.00038727209326,99.99993484644011 100.0003872708007,99.99993484626044 100.0003872698924,99.99993484588116 100.00038726900408,99.9999348455318 100.00038726860481,99.99993484536711 100.00038726719247,99.99993484455364 100.00038726529601,99.99993484352058 100.00038726342952,99.99993484265221 100.00038726328978,99.999934842233 100.00038726327482,99.99993484160417 100.00038726361419,99.99993484070585 100.00038726469216,99.99993483859981 100.00038726536589,99.99993483714753"/>```
这几乎像一个圆圈
- D3
const width = 200,
height = 200;
const gfg = d3
.geoMercator()
.scale(100)
.rotate([0, 0])
.center([0, 0])
.translate([width / 2, height / 2]);
const pathGenerator = d3.geoPath().projection(gfg);
console.log(pathGenerator(geoJsonData));
\Result: M235.44090622291156,77.01656453166521L235.44112089840957,77.01658961448477L235.44101268799594,77.01629578708086L235.4409603281184,77.01466360813455L235.44079801249794,77.01466539977226L235.44036517084345,77.01468152451129L235.44022728983254,77.0146868994242L235.43968449243516,77.01470660743753L235.43913296839153,77.01472810708745L235.43903348462416,77.01473169036237L235.43857097237236,77.01474781509897L235.43840865675196,77.01475319001105L235.43799675904847,77.0147693147469L235.43780128217227,77.014763939835L235.43735273255447,77.01474960673634L235.43698795874081,77.01470302416246L235.43653591846456,77.01463852520587L235.4362182685407,77.01450236071116L235.43590759993384,77.0143769460079L235.4357679735937,77.0143178219212L235.43527404541538,77.01402578464979L235.4346108202996,77.01365491495383L235.43395806715935,77.01334316917195L235.43390919794032,77.0131926711297L235.43390396195255,77.01296692397038L235.43402264434167,77.0126444278288L235.43439963546012,77.01188835262018L235.43463525490915,77.01136698247046
```
生成一个非常小的始终填充的图案，例如
enter image description here
需要生成与在线 Aspose geojson 到 svg 转换器类似结果的离线解决方案
我会在D3.js（版本：7.1.1）
中提供解决方案
const geojson = {
type: 'FeatureCollection',
features: [
{
geometry: {
type: 'LineString',
coordinates: [
[77.601923, 13.054111],
[77.602046, 13.054097],
[77.601984, 13.054261],
[77.601954, 13.055172],
[77.601861, 13.055171],
[77.601613, 13.055162],
[77.601534, 13.055159],
[77.601223, 13.055148],
[77.600907, 13.055136],
[77.60085, 13.055134],
[77.600585, 13.055125],
[77.600492, 13.055122],
[77.600256, 13.055113],
[77.600144, 13.055116],
[77.599887, 13.055124],
[77.599678, 13.05515],
[77.599419, 13.055186],
[77.599237, 13.055262],
[77.599059, 13.055332],
[77.598979, 13.055365],
[77.598696, 13.055528],
[77.598316, 13.055735],
[77.597942, 13.055909],
[77.597914, 13.055993],
[77.597911, 13.056119],
[77.597979, 13.056299],
[77.598195, 13.056721],
[77.59833, 13.057012],
],
},
type: 'Feature',
properties: {
description: 'Southern Ave',
lines: ['Green'],
},
},
],
}
// adjust width and height to change the size of output
const width = 800
const height = 600
const svg = d3
.select('body')
.append('svg')
.attr('width', width)
.attr('height', height)
const g = svg.append('g')
// fitSize makes the output take up all the space inside the svg
const projection = d3.geoMercator().fitSize([width, height], geojson)
const path = d3.geoPath().projection(projection)
// So that it still works if there are more features than just one
g.selectAll('path')
.data(geojson.features)
.enter()
.append('path')
.attr('d', path)
.style('fill', 'none')
.style('stroke-width', '2')
.style('stroke', 'black')
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/7.1.1/d3.min.js"></script>
上下文：需要在列表 UI 中将用户的行进路径显示为 SVG。（应该离线工作）
输入：geoJSON，用户移动坐标列表为 'LineString' 几何。
const geoJsonData = {
type: 'FeatureCollection',
features: [
{
geometry: {
type: 'LineString',
coordinates: [
[77.601923, 13.054111],
[77.602046, 13.054097],
[77.601984, 13.054261],
[77.601954, 13.055172],
[77.601861, 13.055171],
[77.601613, 13.055162],
[77.601534, 13.055159],
[77.601223, 13.055148],
[77.600907, 13.055136],
[77.60085, 13.055134],
[77.600585, 13.055125],
[77.600492, 13.055122],
[77.600256, 13.055113],
[77.600144, 13.055116],
[77.599887, 13.055124],
[77.599678, 13.05515],
[77.599419, 13.055186],
[77.599237, 13.055262],
[77.599059, 13.055332],
[77.598979, 13.055365],
[77.598696, 13.055528],
[77.598316, 13.055735],
[77.597942, 13.055909],
[77.597914, 13.055993],
[77.597911, 13.056119],
[77.597979, 13.056299],
[77.598195, 13.056721],
[77.59833, 13.057012],
],
},
type: 'Feature',
properties: {
description: 'Southern Ave',
lines: ['Green'],
},
},
],
};
问题：生成的 SVG 路径未绘制预期的线。
预期结果：我尝试使用 Aspose 在线转换器服务，此服务给我正确的结果。 link : https://products.aspose.app/gis/viewer/geojson-to-svg
\Result :```<path d="m771.5 575.78l23.5 2.68-11.85-31.33-5.73-174.05-17.76.19-47.39 1.72-15.09.57-59.42 2.1-60.37 2.3-10.89.38-50.63 1.72-17.76.57-45.09 1.72-21.4-.57-49.1-1.53-39.93-4.97-49.48-6.88-34.78-14.52-34-13.37-15.29-6.31-54.06-31.14-72.6-39.54-71.46-33.25-5.35-16.05-.57-24.07 12.99-34.39 41.27-80.62 25.79-55.6"></path>```
enter image description here
尝试过的解决方案：
geojson2svg (https://github.com/gagan-bansal/geojson2svg)
var converter = geojson2svg({ viewportSize: {width: 200, height: 300}, output: 'svg', }); const svgStr = converter.convert(geoJsonData); \Result: <path d="M100.00038728329726,99.99993485162537 100.00038728391112,99.99993485169524 100.0003872836017,99.99993485087678 100.00038728345197,99.9999348463303 100.00038728298784,99.9999348463353 100.00038728175016,99.9999348463802 100.00038728135591,99.99993484639519 100.00038727980382,99.99993484645007 100.00038727822678,99.99993484650997 100.00038727794231,99.99993484651996 100.00038727661978,99.99993484656486 100.00038727615566,99.99993484657985 100.00038727497787,99.99993484662475 100.00038727441891,99.99993484660978 100.00038727313631,99.99993484656986 100.00038727209326,99.99993484644011 100.0003872708007,99.99993484626044 100.0003872698924,99.99993484588116 100.00038726900408,99.9999348455318 100.00038726860481,99.99993484536711 100.00038726719247,99.99993484455364 100.00038726529601,99.99993484352058 100.00038726342952,99.99993484265221 100.00038726328978,99.999934842233 100.00038726327482,99.99993484160417 100.00038726361419,99.99993484070585 100.00038726469216,99.99993483859981 100.00038726536589,99.99993483714753"/>```
这几乎像一个圆圈
- D3
const width = 200, height = 200; const gfg = d3 .geoMercator() .scale(100) .rotate([0, 0]) .center([0, 0]) .translate([width / 2, height / 2]);
const pathGenerator = d3.geoPath().projection(gfg);
console.log(pathGenerator(geoJsonData));
\Result: M235.44090622291156,77.01656453166521L235.44112089840957,77.01658961448477L235.44101268799594,77.01629578708086L235.4409603281184,77.01466360813455L235.44079801249794,77.01466539977226L235.44036517084345,77.01468152451129L235.44022728983254,77.0146868994242L235.43968449243516,77.01470660743753L235.43913296839153,77.01472810708745L235.43903348462416,77.01473169036237L235.43857097237236,77.01474781509897L235.43840865675196,77.01475319001105L235.43799675904847,77.0147693147469L235.43780128217227,77.014763939835L235.43735273255447,77.01474960673634L235.43698795874081,77.01470302416246L235.43653591846456,77.01463852520587L235.4362182685407,77.01450236071116L235.43590759993384,77.0143769460079L235.4357679735937,77.0143178219212L235.43527404541538,77.01402578464979L235.4346108202996,77.01365491495383L235.43395806715935,77.01334316917195L235.43390919794032,77.0131926711297L235.43390396195255,77.01296692397038L235.43402264434167,77.0126444278288L235.43439963546012,77.01188835262018L235.43463525490915,77.01136698247046
```
生成一个非常小的始终填充的图案，例如 enter image description here
需要生成与在线 Aspose geojson 到 svg 转换器类似结果的离线解决方案
我会在D3.js（版本：7.1.1）
中提供解决方案const geojson = {
type: 'FeatureCollection',
features: [
{
geometry: {
type: 'LineString',
coordinates: [
[77.601923, 13.054111],
[77.602046, 13.054097],
[77.601984, 13.054261],
[77.601954, 13.055172],
[77.601861, 13.055171],
[77.601613, 13.055162],
[77.601534, 13.055159],
[77.601223, 13.055148],
[77.600907, 13.055136],
[77.60085, 13.055134],
[77.600585, 13.055125],
[77.600492, 13.055122],
[77.600256, 13.055113],
[77.600144, 13.055116],
[77.599887, 13.055124],
[77.599678, 13.05515],
[77.599419, 13.055186],
[77.599237, 13.055262],
[77.599059, 13.055332],
[77.598979, 13.055365],
[77.598696, 13.055528],
[77.598316, 13.055735],
[77.597942, 13.055909],
[77.597914, 13.055993],
[77.597911, 13.056119],
[77.597979, 13.056299],
[77.598195, 13.056721],
[77.59833, 13.057012],
],
},
type: 'Feature',
properties: {
description: 'Southern Ave',
lines: ['Green'],
},
},
],
}
// adjust width and height to change the size of output
const width = 800
const height = 600
const svg = d3
.select('body')
.append('svg')
.attr('width', width)
.attr('height', height)
const g = svg.append('g')
// fitSize makes the output take up all the space inside the svg
const projection = d3.geoMercator().fitSize([width, height], geojson)
const path = d3.geoPath().projection(projection)
// So that it still works if there are more features than just one
g.selectAll('path')
.data(geojson.features)
.enter()
.append('path')
.attr('d', path)
.style('fill', 'none')
.style('stroke-width', '2')
.style('stroke', 'black')
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/7.1.1/d3.min.js"></script>