d3.js中的多邊形沒有填充/正確地構建

我的任務是編寫一組功能，這些功能以轉換爲EPSG 4326座標的wkt格式提供給我，然後將這些功能更改爲EPSG 3857，然後使用新座標爲了顯示與它們直接相關的信息而生成特徵的粗略地圖。d3.js中的多邊形沒有填充/正確地構建

我已經完成了保存一個任務的所有任務，正確繪製了多邊形的多邊形（我們有極點架空線和地塊的數據），我只能提供其中一些座標。我使用proj4js來翻譯從4326到3857以及wellknown.js從wkt到4326座標的解析。這些繪圖是由d3完成的，點擊事件由jquery和d3混合處理。

我覺得這也是值得一提的，這都是在獨立的應用程序中，它使用cefsharp作爲查看地圖的窗口（所以沒有服務器端腳本，也不是命令行）。

以下是我原本通過的數據。

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我做出最終形成了以下的變化（proj4js，高鐵總站解析）另一種旁註我發現，我不得不乘我從proj4js重投影收到座標（EPSG：3857）到3600使它們不能彼此疊加，甚至看起來遠程正確。

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我不能確定，如果這個問題是從D3讀取錯誤的座標造成的，proj4js翻譯他們錯了或什麼我已經在我的身邊來完成。我已經使用鞋帶公式來測試多邊形的CW列表，並且他們似乎是這樣查看的（我可能會誤解），但這是我得到的唯一表現出這種特定方式的信息。如果需要任何附加信息並且我可以提供它（包括我的代碼的片段和當前正在運行的一組點與上面的過程相同）。

主要問題是雖然它會正確繪製邊界，但它將多邊形繪製爲更大的正方形（不是簡單的邊界框）內的孔並填充外部區域。

下面的代碼是我使用鞋帶公式確定多邊形頂點的順序是CW還是CCW的片段。頂點是在JSON中找到的座標列表。

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; 
}

謝謝你的時間。

來源

2014-10-17 cochs

那麼究竟是什麼問題？ – 2014-10-17 20:56:32

對不起，我以爲我已經澄清，我想我沒有。主要問題是，雖然它會正確繪製邊界，但它將多邊形繪製爲更大的正方形（不是簡單的邊界框）內的孔並填充外部區域。 – cochs 2014-10-17 20:58:58

D3的座標必須按照順時針順序排列，才能正確繪製。這聽起來像你的座標是在逆時針順序。 – 2014-10-17 21:02:02

因此，爲了解決這個問題，我使用d3繪製路徑，然後沿路徑提取點（因爲這是獲得d3生成的正確投影點的唯一方法），並將其注入到可以將其推入svg多邊形元素中的數組。

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(); 
});

第這是AG元素的引用，其容納在我的SVG的路徑時，第二本（被去除的一種是，我從檢索的座標路徑的參考。

看起來svg多邊形並不在意哪個訂單點在這個問題上，並且推斷出它自己的內部是什麼，但是這可能是有限的，但我正在測試這個。

來源

2014-10-22 13:35:52 cochs

d3.js中的多邊形沒有填充/正確地構建

回答

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