样式数据地图项示例

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此页面介绍如何以程序化方式访问数据集并设置其地图项的样式。 并逐步讲解基于点、多边形和各种数据地图项的样式设置示例， 以及多段线几何图形

在对数据集进行数据驱动型样式设置时，系统会基于创建数据集时所用的地理空间数据文件中提供的经纬度坐标来渲染数据地图项。

点数据的样式设置示例

本例演示了如何为基于点几何图形的数据地图项设置样式。

显示已设定样式的点数据的屏幕截图。

关于数据集

本例中使用的数据集是 2018 年对 松鼠 纽约中央公园内的景象在 CSV 数据文件的以下内容中， x 和 y 列用于表示地理位置；包含 LatLng 列，但 因为数据集仅支持 WKT 格式 如果列名为 WKT。如需详细了解支持的格式 有关位置，请参阅 CSV 要求。

松鼠普查数据集包含大量不同的数据点 与观察到的松鼠毛色和行为相关（请务必滚动浏览 水平可查看所有内容）。

X Y UniqueSquirrelID Hectare Shift Date Hectare SquirrelNumber Age PrimaryFurColor HighlightFurColor CombinationofPrimaryandHighlightColor Colornotes Location AboveGroundSighter Measurement SpecificLocation Running Chasing Climbing Eating Foraging Other Activities Kuks Quaas Moans Tailflags Tailtwitches Approaches Indifferent Runsfrom OtherInteractions LatLng
-73.9561344937861 40.7940823884086 37F-PM-1014-03 37F PM 10142018 3 + false false false false false false false false false false false false false POINT (-73.9561344937861 40.7940823884086)
-73.9688574691102 40.7837825208444 21B-AM-1019-04 21B AM 10192018 4 + false false false false false false false false false false false false false POINT (-73.9688574691102 40.7837825208444)
-73.9742811484852 40.775533619083 11B-PM-1014-08 11B PM 10142018 8 Gray Gray+ Above Ground 10 false true false false false false false false false false false false false POINT (-73.97428114848522 40.775533619083)
-73.9596413903948 40.7903128889029 32E-PM-1017-14 32E PM 10172018 14 Adult Gray Gray+ Nothing selected as Primary. Gray selected as Highlights. Made executive adjustments. false false false true true false false false false false false false true POINT (-73.9596413903948 40.7903128889029)
-73.9702676472613 40.7762126854894 13E-AM-1017-05 13E AM 10172018 5 Adult Gray Cinnamon Gray+Cinnamon Above Ground on tree stump false false false false true false false false false false false false false POINT (-73.9702676472613 40.7762126854894)
-73.9683613516225 40.7725908847499 11H-AM-1010-03 11H AM 10102018 3 Adult Cinnamon White Cinnamon+White false false false false true false false false false true false true false POINT (-73.9683613516225 40.7725908847499)
-73.9541201789795 40.7931811701082 36H-AM-1010-02 36H AM 10102018 2 Adult Gray Gray+ just outside hectare Ground Plane FALSE false false false false true false false false false false false false false POINT (-73.9541201789795 40.7931811701082)

设置点数据地图项的样式

此示例中的代码采用设置填充颜色样式的方法， 根据 CombinationofPrimaryandHighlightColor 为每个点的描边颜色 属性，该属性组合了每件商品的主要和次要的皮草颜色 松鼠。

Kotlin

private fun styleDatasetsLayer() {

  // Create the style factory function.
  val styleFactory = FeatureLayer.StyleFactory { feature: Feature ->

      // Set default colors to to yellow and point radius to 8.
      var fillColor = Color.YELLOW
      var strokeColor = Color.YELLOW
      var pointRadius = 8F
      // Check if the feature is an instance of DatasetFeature.
      if (feature is DatasetFeature) {

        val furColors: MutableMap<String, String> = feature.getDatasetAttributes()
        // Determine CombinationofPrimaryandHighlightColor attribute.
        val furColor = furColors!!["CombinationofPrimaryandHighlightColor"]
        when (furColor) {
          "Black+" -> {
            fillColor = Color.BLACK
            strokeColor= Color.BLACK
          }
          "Cinnamon+" ->  {
            fillColor = -0x750000
            strokeColor= -0x750000
          }
          "Cinnamon+Gray" -> {
            fillColor = -0x750000
            strokeColor= -0x750000
            pointRadius = 6F
          }
          "Cinnamon+White" -> {
            fillColor = -0x750000
            strokeColor= Color.WHITE
            pointRadius = 6F
          }
          "Gray+" -> fillColor = Color.GRAY
          "Gray+Cinnamon" -> {
            fillColor = Color.GRAY
            strokeColor= -0x750000
            pointRadius = 6F
          }
          "Gray+Cinnamon, White" -> {
            fillColor = Color.LTGRAY
            strokeColor= -0x750000
            pointRadius = 6F
          }
          "Gray+White" -> {
            fillColor = Color.GRAY
            strokeColor= Color.WHITE
            pointRadius = 6F
          }
        }
        return@StyleFactory FeatureStyle.Builder()
          .fillColor(fillColor)
          .strokeColor(strokeColor)
          .pointRadius(pointRadius)
          .build()
      }
    return@StyleFactory null
  }

  // Apply the style factory function to the feature layer.
  datasetLayer?.setFeatureStyle(styleFactory)
}

Java

private void styleDatasetsLayer() {

  // Create the style factory function.
  FeatureLayer.StyleFactory styleFactory = (Feature feature) -> {

    // Check if the feature is an instance of DatasetFeature.
    if (feature instanceof DatasetFeature) {

      // Determine CombinationofPrimaryandHighlightColor attribute.
      Map<String, String> furColors = ((DatasetFeature) feature).getDatasetAttributes();
      String furColor = furColors.get("CombinationofPrimaryandHighlightColor");
      // Set default colors to to yellow and point radius to 8.
      int fillColor = Color.YELLOW;
      int strokeColor = Color.YELLOW;
      int pointRadius = 8;
      switch (furColor) {
        case "Black+":
          fillColor = Color.BLACK;
          strokeColor = Color.BLACK;
          break;
        case "Cinnamon+":
          fillColor = 0xff8b0000;
          strokeColor = 0xff8b0000;
          break;
        case "Cinnamon+Gray":
          fillColor = 0xff8b0000;
          strokeColor = Color.GRAY;
          pointRadius = 6;
          break;
        case "Cinnamon+White":
          fillColor = 0xff8b0000;
          strokeColor = Color.WHITE;
          pointRadius = 6;
          break;
        case "Gray+":
          fillColor = Color.GRAY;
          strokeColor = Color.GRAY;
          break;
        case "Gray+Cinnamon":
          fillColor = Color.GRAY;
          strokeColor = 0xff8b0000;
          pointRadius = 6;
          break;
        case "Gray+Cinnamon, White":
          fillColor = Color.LTGRAY;
          strokeColor = 0xff8b0000;
          pointRadius = 6;
          break;
        case "Gray+White":
          fillColor = Color.GRAY;
          strokeColor = Color.WHITE;
          pointRadius = 6;
          break;
        default:
          fillColor = Color.YELLOW;
          strokeColor = Color.YELLOW;
          pointRadius = 8;
      }
      return new FeatureStyle.Builder()
        .fillColor(fillColor)
        .strokeColor(strokeColor)
        .pointRadius(pointRadius)
        .build();
    }
    return null;
  };

  // Apply the style factory function to the feature layer.
  datasetLayer.setFeatureStyle(styleFactory);
}

多边形数据的样式设置示例

本例演示了如何为基于多边形几何图形的数据地图项设置样式。

显示已设定样式的多边形数据的屏幕截图。

关于数据集

本例中使用的数据集描绘的是纽约市的公园。以下内容摘录自 GeoJSON 数据集文件，显示了一个具有代表性的地图项条目。

{
  "type": "Feature",
  "properties": {
    "jurisdiction": "DPR",
    "mapped": "False",
    "zipcode": "11356",
    "acres": "0.05",
    "location": "College Pl., College Pt. Blvd., bet. 11 Ave. and 12 Ave.",
    "nys_assembly": "27",
    "councildistrict": "19",
    "url": "http://www.nycgovparks.org/parks/Q042/",
    "typecategory": "Triangle/Plaza",
    "us_congress": "14",
    "eapply": "Poppenhusen Park",
    "parentid": "Q-07",
    "gispropnum": "Q042",
    "retired": "false",
    "communityboard": "407",
    "objectid": "6248",
    "globalid": "F4810079-CBB9-4BE7-BBFA-B3C0C35D5DE5",
    "name311": "Poppenhusen Park",
    "department": "Q-07",
    "pip_ratable": "true",
    "subcategory": "Sitting Area/Triangle/Mall",
    "precinct": "109",
    "permit": "true",
    "acquisitiondate": null,
    "omppropid": "Q042",
    "gisobjid": "100000301",
    "signname": "Poppenhusen Park",
    "address": null,
    "permitparent": "Q-07",
    "class": "PARK",
    "nys_senate": "11",
    "permitdistrict": "Q-07",
    "borough": "Q",
    "waterfront": "false"
  },
  "geometry": {
    "type": "MultiPolygon",
    "coordinates": [
      [
        [
          [
            -73.84575702371716,
            40.78796240884273
          ],
          [
            -73.84593393292693,
            40.78796857347548
          ],
          [
            -73.84577256469657,
            40.787651355629556
          ],
          [
            -73.84575702371716,
            40.78796240884273
          ]
        ]
      ]
    ]
  }
},

设置多边形数据地图项的样式

本例中的代码将特殊颜色应用于 typecategory 为“Undeveloped”或“Parkway”的数据地图项，并将所有其他地图项的颜色设为绿色。

Kotlin

private fun styleDatasetsLayer() {

    // Create the style factory function.
    val styleFactory = FeatureLayer.StyleFactory { feature: Feature ->

        // Check if the feature is an instance of DatasetFeature.
        if (feature is DatasetFeature) {
          // Determine the value of the typecategory attribute.
          val typeCategories: MutableMap<String, String> = feature.getDatasetAttributes()
          val typeCategory = typeCategories!!["typecategory"]
          // Set default colors to green.
          var fillColor = 0x4000ff00
          var strokeColor = 0xff00ff00
          when (typeCategory) {
            "Undeveloped" -> {
              // Color undeveloped areas blue.
              fillColor = 0x400000ff
              strokeColor = 0x400000ff
            }
            "Parkway" -> {
              // Color parkway areas red.
              fillColor = 0x40ff0000
              strokeColor = 0x40ff0000
            }
            else -> {
              // Color all other areas green.
              fillColor = 0x4000ff00
              strokeColor = 0xff00ff00
            }
          }
          return Builder()
            .fillColor(fillColor)
            .strokeColor(strokeColor)
            .strokeWidth(2F)
            .build()
        }
        return@StyleFactory null
    }

    // Apply the style factory function to the feature layer.
    datasetLayer?.setFeatureStyle(styleFactory)
}

Java

private void styleDatasetsLayer() {

    // Create the style factory function.
    FeatureLayer.StyleFactory styleFactory = (Feature feature) -> {

      // Check if the feature is an instance of DatasetFeature.
      if (feature instanceof DatasetFeature) {

        // Determine the value of the typecategory attribute.
        Map<String, String> typeCategories = ((DatasetFeature) feature).getDatasetAttributes();
        String typeCategory = typeCategories.get("typecategory");
        // Set default colors to green.
        int fillColor = 0x4000ff00;
        int strokeColor = 0xff00ff00;
        switch (typeCategory) {
          case "Undeveloped":
            // Color undeveloped areas blue.
            fillColor = 0x400000ff;
            strokeColor = 0xff0000ff;
            break;
          case "Parkway":
            // Color parkway areas red.
            fillColor = 0x40ff0000;
            strokeColor = 0xffff0000;
            break;
          default:
            // Color all other areas green.
            fillColor = 0x4000ff00;
            strokeColor = 0xff00ff00;
        }
        return new FeatureStyle.Builder()
          .fillColor(fillColor)
          .strokeColor(strokeColor)
          .strokeWidth(2)
          .build();
      }
      return null;
    };

    // Apply the style factory function to the feature layer.
    datasetLayer.setFeatureStyle(styleFactory);
}

多段线数据的样式设置示例

本例演示了如何为基于多段线几何图形的数据地图项设置样式。

显示已设定样式的多段线数据的屏幕截图。

关于数据集

本例中使用的数据集描绘的是西雅图地区的桥梁。以下内容摘录自 GeoJSON 数据集文件，显示了一个具有代表性的地图项条目。

{
  "type": "Feature",
  "properties": {
      "OBJECTID": 1,
      "COMPTYPE": 66,
      "COMPKEY": 515774,
      "HANSEGKEY": 489781,
      "UNITID": "BRG-935",
      "UNITTYPE": " ",
      "BRGUNITID": "BRG-935",
      "UNITDESC_BRG": "YALE AVE BR REV LANE OC                                                                                                                                                                                                                                        ",
      "UNITDESC_SEG": "HOWELL ST ON RP BETWEEN HOWELL ST AND I5 SB                                                                                                                                                                                                                    ",
      "INSTDATE": null,
      "EXPDATE": null,
      "STATUS": " ",
      "STATUSDT": null,
      "CONDITION": " ",
      "CONDDT": null,
      "OWN": " ",
      "LSTVERIFY": null,
      "MAINTBY": " ",
      "ADDBY": "GARCIAA",
      "ADDDTTM": "2010-01-21T00:00:00Z",
      "MODBY": null,
      "MODDTTM": null,
      "BR_NBR": 935,
      "BR_CODE": " 935",
      "BR_TYPE": "ST",
      "BR_NAME": "YALE AVE BR REV LANE OC",
      "BR_FACILITIES": "YALE AVE-SR 5 ON RAMP",
      "BR_FEATURES": "SR 5 REV LANE",
      "BR_RATING": 0,
      "BR_INSET": 1,
      "BR_GEO": "DT",
      "BR_OWNER": "DOT",
      "BR_OWNER_NAME": "State of Washington",
      "GEOBASID": 0,
      "XGEOBASID": 0,
      "GISSEGKEY": 489781,
      "EARTHQUAKE_RESPONSE_TEAM": " ",
      "SHAPE_Length": 220.11891836147655
  },
  "geometry": {
      "type": "LineString",
      "coordinates": [
          [
              -122.329201929090928,
              47.616910448708538
          ],
          [
              -122.329206483407461,
              47.616976719821004
          ],
          [
              -122.32921802149356,
              47.617042137515213
          ],
          [
              -122.329236413912909,
              47.617105967923777
          ],
          [
              -122.329261454336034,
              47.617167494985758
          ],
          [
              -122.329292861855023,
              47.617226028479571
          ],
          [
              -122.329330284134699,
              47.617280911766009
          ],
          [
              -122.329373301365223,
              47.617331529154569
          ],
          [
              -122.329421430971635,
              47.617377312810319
          ],
          [
              -122.329474133027375,
              47.617417749124023
          ],
          [
              -122.32953081631139,
              47.617452384473893
          ]
      ]
  }
},

设置多段线数据地图项的样式

以下代码段会将相同的样式直接应用于所有数据地图项。

Kotlin

private fun styleDatasetsLayer() {

  // Create the style factory function.
  val styleFactory = FeatureLayer.StyleFactory { feature: Feature ->

    // Check if the feature is an instance of DatasetFeature.
    if (feature is DatasetFeature) {

      return@StyleFactory FeatureStyle.Builder()
        // Define a style with green stroke with a width of 4.
        .strokeColor(0xff00ff00.toInt())
        .strokeWidth(4F)
        .build()
    }
    return@StyleFactory null
  }

  // Apply the style factory function to the feature layer.
  datasetLayer?.setFeatureStyle(styleFactory)
}

Java

private void styleDatasetsLayer() {

  // Create the style factory function.
  FeatureLayer.StyleFactory styleFactory = (Feature feature) -> {

    // Check if the feature is an instance of DatasetFeature.
    if (feature instanceof DatasetFeature) {

      return new FeatureStyle.Builder()
        // Define a style with green stroke with a width of 4.
        .strokeColor(0xff00ff00)
        .strokeWidth(4)
        .build();
    }
    return null;
  };

  // Apply the style factory function to the feature layer.
  datasetLayer.setFeatureStyle(styleFactory);
}