mapbox 下部分面数据图层绘制异常

[lvisei]

问题描述

面数据三角剖分异常

重现链接

https://li.antv.antgroup.com/#/template/09ccdf29-8bb0-4af8-8aa7-c89cfb4a2281?nav=layers

重现步骤

数据

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      },
      properties: {
        adcode: 150000,
        level: 'province',
        name: '内蒙古自治区',
        pinyin: 'neimengguzizhiqu',
        parent: {
          adcode: 100000,
        },
        childrenNum: 12,
        center: [111.765226, 40.818233],
        centroid: [111.765226, 40.818233],
      },
    },
  ],
}

预期行为

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平台

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屏幕截图或视频（可选）

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补充说明（可选）

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[lzxue]

这个之前一直就有，不确定是不是精度问题

[lvisei]

这个之前一直就有，不确定是不是精度问题
mapbox/earcut#159

不是精度问题，是 earcut 算法进行三角剖分的时候，数据得是一个共平面的数据，也就是投影后的数据。

Note that Earcut is a 2D triangulation algorithm, and handles 3D data as if it was projected onto the XY plane

需要先讲数据进行投影后，再计算三角剖分的索引数据，deck 也是这么做的，我们的线的三角剖分没有出问题，是因为画拐点的时候把提前把数据投影了。