我的任务是绘制一系列以wkt格式提供给我的功能,转换为EPSG 4326坐标,将其更改为EPSG 3857,然后使用新坐标生成粗略的特征图。显示与他们直接相关的信息。
我完成了所有任务,除了一个,正确地绘制了多个多边形,(我们有极数架空线和地块的数据)我只能提供其中一些的坐标。我使用proj4js从4326到3857和wellknown.js进行翻译,从wkt到4326坐标进行解析。批量绘图由d3完成,点击事件由jquery和d3混合处理。
我觉得值得一提的是,这一切都安置在一个独立的应用程序中,该应用程序使用cefsharp作为查看地图的窗口(因此不可能有服务器端脚本,也不是命令行)。
以下是我最初传递的数据。
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我做出的改变最终形成了以下(proj4js,wkt parse)另一个旁注我发现我必须将我从proj4js重投影(EPSG:3857)收到的坐标乘以3600,以使它们不会叠加在每个其他甚至看起来都很正确。
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我不确定这个问题是否是由于d3错误地读取坐标引起的,proj4js将它们翻译错误或者我在我身边做了些什么。我已经使用鞋带公式来测试多边形的CW列表,它们似乎就这样检查(我可能会弄错),但这是我得到的唯一一组表现出这种特殊方式的信息。如果需要任何其他信息,我可以提供它,(包括我的代码片段以及当前工作的点数,这些点经过与上述相同的过程)。
主要问题是虽然它会正确地绘制边界,但它会将多边形绘制为一个更大的正方形(不是简单的边界框)内的洞并填充外部区域。
以下代码是我在鞋带公式后使用的片段,用于确定多边形顶点的顺序是CW还是CCW。顶点是JSON中找到的坐标列表。
function polygonArea(vertices) {
var sum = 0.0;
for (var i = 0; i < vertices.length; i++) {
var v1 = vertices[i];
var v2 = vertices[(i + 1) % vertices.length];
sum += (v2[0] - v1[0]) * (v2[1] + v1[1]);
}
return sum > 0.0;
}
感谢您的时间。
答案 0 :(得分:0)
所以为了解决我遇到的问题,我利用d3绘制路径然后沿着路径提取点(因为这是获得d3生成的正确投影点的唯一方法)和pathSegList并将它们注入到数组中可以推入svg多边形元素。
d3.select(this).selectAll('path').each(function(){
var coords = [];
var pArr = this.pathSegList;
for(var i = 0; i < pArr.length; i++){
if (pArr[i].x && pArr[i].y){
coords[i] = [pArr[i].x, pArr[i].y]
}
}
d3.select(this.parentNode).append('polygon')
.attr('points', coords)
d3.select(this).attr('fill', 'rgba(0,0,0,0)')
this.remove();
});
第一个是对我的svg中包含路径的g元素的引用,第二个(被删除的那个是对我从中检索坐标的路径的引用。
似乎svg多边形不关心哪个顺序点在哪里,如果这是问题,并且推断它本身的内部是什么,这可能是有限的,但我正在测试它。