json如何解析几何图行

JSON（JavaScript Object Notation）是一种轻量级的数据交换格式，常被用于Web应用之间的数据交换。在几何图形领域中，JSON也被广泛应用于对几何图形进行解析。

//示例JSON数据
{
  "type": "FeatureCollection","features": [
    {
      "type": "Feature","geometry": {
        "type": "Point","coordinates": [102.0,0.5]
      },"properties": {
        "name": "MyPoint"
      }
    },{
      "type": "Feature","geometry": {
        "type": "Linestring","coordinates": [
          [102.0,0.0],[103.0,1.0],[104.0,[105.0,1.0]
        ]
      },"properties": {
        "name": "MyLine"
      }
    },"geometry": {
        "type": "polygon","coordinates": [
          [
            [100.0,[101.0,[100.0,0.0]
          ]
        ]
      },"properties": {
        "name": "Mypolygon"
      }
    }
  ]
}

以上是一段示例JSON数据，包括了三个几何图形：点、线、面。通过解析JSON数据的“geometry”属性，我们可以获取到每个几何图形的类型和坐标。

以JavaScript为例，解析JSON数据可以使用JSON.parse()方法：

//示例JavaScript代码
var jsonString = '{...}'; //以上示例JSON数据字符串
var jsonObj = JSON.parse(jsonString);
var features = jsonObj.features;
for (var i = 0; i < features.length; i++) {
  var geometry = features[i].geometry;
  if (geometry.type === "Point") {
    console.log("点坐标：" + geometry.coordinates);
  } else if (geometry.type === "Linestring") {
    console.log("线坐标：" + geometry.coordinates);
  } else if (geometry.type === "polygon") {
    console.log("面坐标：" + geometry.coordinates);
  }
}

通过以上代码，我们可以获取到每个几何图形的坐标，并根据其类型进行相应的处理。