Openlayers学习笔记

# 六.地图绘制

  • 场景
    • 电子围栏

# 1.绘制和修改功能

属性 作用 配置
ol/interaction/Draw 绘制地理要素 -
ol/interaction/Modify 更改要素 -
ol/interaction/Snap 自动吸附到要素 -
查看代码详情 
<template>
  <div>
    <div ref="map" class="map"></div>
    <form class="form-inline">
      <label for="type">几何类型 &nbsp;</label>
      <select ref="type">
        <option value="Point">点</option>
        <option value="LineString">直线</option>
        <option value="Polygon">多边形</option>
        <option value="Circle">圆</option>
      </select>
    </form>
  </div>
</template>

<script>
export default {
  mounted() {
    let {
      Map,
      View,
      layer: { Tile: TileLayer, Vector: VectorLayer },
      source: { OSM, Vector: VectorSource },
      style: { Circle: CircleStyle, Fill, Stroke, Style },
      interaction: { Draw, Modify, Snap },
      proj: { get },
    } = ol;
    const raster = new TileLayer({
      source: new OSM(),
    });
    const source = new VectorSource();
    const vector = new VectorLayer({
      source: source,
      style: new Style({
        fill: new Fill({
          color: "rgba(255, 255, 255, 0.2)",
        }),
        stroke: new Stroke({
          color: "#ffcc33",
          width: 2,
        }),
        image: new CircleStyle({
          radius: 7,
          fill: new Fill({
            color: "#ffcc33",
          }),
        }),
      }),
    });
    const extent = get("EPSG:3857").getExtent().slice();
    extent[0] += extent[0];
    extent[2] += extent[2];
    const map = new Map({
      layers: [raster, vector],
      target: this.$refs.map,
      view: new View({
        center: [12579156, 3274244],
        zoom: 3,
        extent,
      }),
    });
    map.addInteraction(new Modify({ source: source }));
    let draw, snap;
    const typeSelect = this.$refs.type;
    function addInteractions() {
      draw = new Draw({
        source: source,
        type: typeSelect.value,
      });
      draw.on("drawend", function (e) {
        const geometry = e.feature.getGeometry();
        const corrdinates = geometry.getCoordinates();
        console.log(corrdinates);
        // map.removeInteraction(draw)
        // map.removeInteraction(snap)
      });
      map.addInteraction(draw);
      snap = new Snap({ source: source });
      map.addInteraction(snap);
    }
    typeSelect.onchange = function () {
      map.removeInteraction(draw);
      map.removeInteraction(snap);
      addInteractions();
    };
    addInteractions();
  },
};
</script>
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# 2.绘制和修改测地线圆

查看代码详情 
<template>
  <div>
    <div ref="map" class="map"></div>
    <form class="form-inline">
      <label for="type">几何类型 &nbsp;</label>
      <select ref="type">
        <option value="Point">点</option>
        <option value="LineString">直线</option>
        <option value="Polygon">多边形</option>
        <option value="Circle">圆</option>
        <option value="Geodesic" selected>测地线圆</option>
      </select>
    </form>
  </div>
</template>

<script>
export default {
  mounted() {
    let {
      geom: { GeometryCollection, Point, Polygon, Polygon: circular },
      Map,
      View,
      layer: { Tile: TileLayer, Vector: VectorLayer },
      source: { OSM, Vector: VectorSource },
      style: { Circle: CircleStyle, Fill, Stroke, Style },
      interaction: { Draw, Modify, Snap },
      proj: { transform },
      sphere: { getDistance },
    } = ol;
    const raster = new TileLayer({
      source: new OSM(),
    });
    const source = new VectorSource();
    const style = new Style({
      fill: new Fill({
        color: "rgba(255, 255, 255, 0.2)",
      }),
      stroke: new Stroke({
        color: "#33cc33",
        width: 2,
      }),
      image: new CircleStyle({
        radius: 7,
        fill: new Fill({
          color: "#ffcc33",
        }),
      }),
    });
    const geodesicStyle = new Style({
      geometry: function (feature) {
        return feature.get("modifyGeometry") || feature.getGeometry();
      },
      fill: new Fill({
        color: "rgba(255, 255, 255, 0.2)",
      }),
      stroke: new Stroke({
        color: "#ff3333",
        width: 2,
      }),
      image: new CircleStyle({
        radius: 7,
        fill: new Fill({
          color: "rgba(0, 0, 0, 0)",
        }),
      }),
    });
    const vector = new VectorLayer({
      source: source,
      style: function (feature) {
        const geometry = feature.getGeometry();
        return geometry.getType() === "GeometryCollection"
          ? geodesicStyle
          : style;
      },
    });
    const map = new Map({
      layers: [raster, vector],
      target: this.$refs.map,
      view: new View({
        center: [12579156, 3274244],
        zoom: 3,
      }),
    });
    const defaultStyle = new Modify({ source: source })
      .getOverlay()
      .getStyleFunction();
    const modify = new Modify({
      source: source,
      style: function (feature) {
        feature.get("features").forEach(function (modifyFeature) {
          const modifyGeometry = modifyFeature.get("modifyGeometry");
          if (modifyGeometry) {
            const modifyPoint = feature.getGeometry().getCoordinates();
            const geometries = modifyFeature.getGeometry().getGeometries();
            const polygon = geometries[0].getCoordinates()[0];
            const center = geometries[1].getCoordinates();
            const projection = map.getView().getProjection();
            let first, last, radius;
            if (modifyPoint[0] === center[0] && modifyPoint[1] === center[1]) {
              first = transform(polygon[0], projection, "EPSG:4326");
              last = transform(
                polygon[(polygon.length - 1) / 2],
                projection,
                "EPSG:4326"
              );
              radius = getDistance(first, last) / 2;
            } else {
              first = transform(center, projection, "EPSG:4326");
              last = transform(modifyPoint, projection, "EPSG:4326");
              radius = getDistance(first, last);
            }
            const circle = circular(
              transform(center, projection, "EPSG:4326"),
              radius,
              128
            );
            circle.transform("EPSG:4326", projection);
            geometries[0].setCoordinates(circle.getCoordinates());
            modifyGeometry.setGeometries(geometries);
          }
        });
        return defaultStyle(feature);
      },
    });
    modify.on("modifystart", function (event) {
      event.features.forEach(function (feature) {
        const geometry = feature.getGeometry();
        if (geometry.getType() === "GeometryCollection") {
          feature.set("modifyGeometry", geometry.clone(), true);
        }
      });
    });
    modify.on("modifyend", function (event) {
      event.features.forEach(function (feature) {
        const modifyGeometry = feature.get("modifyGeometry");
        if (modifyGeometry) {
          feature.setGeometry(modifyGeometry);
          feature.unset("modifyGeometry", true);
        }
      });
    });
    map.addInteraction(modify);
    let draw, snap;
    const typeSelect = this.$refs.type;
    function addInteractions() {
      let value = typeSelect.value;
      let geometryFunction;
      if (value === "Geodesic") {
        value = "Circle";
        geometryFunction = function (coordinates, geometry, projection) {
          if (!geometry) {
            geometry = new GeometryCollection([
              new Polygon([]),
              new Point(coordinates[0]),
            ]);
          }
          const geometries = geometry.getGeometries();
          const center = transform(coordinates[0], projection, "EPSG:4326");
          const last = transform(coordinates[1], projection, "EPSG:4326");
          const radius = getDistance(center, last);
          const circle = circular(center, radius, 128);
          circle.transform("EPSG:4326", projection);
          geometries[0].setCoordinates(circle.getCoordinates());
          geometry.setGeometries(geometries);
          return geometry;
        };
      }
      draw = new Draw({
        source: source,
        type: value,
        geometryFunction: geometryFunction,
      });
      map.addInteraction(draw);
      snap = new Snap({ source: source });
      map.addInteraction(snap);
    }
    typeSelect.onchange = function () {
      map.removeInteraction(draw);
      map.removeInteraction(snap);
      addInteractions();
    };
    addInteractions();
  },
};
</script>
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# 3.地理编辑

查看代码详情 
<template>
  <div>
    <div ref="map" class="map"></div>
    <select ref="mode">
      <option value="modify">选择要修改的特征</option>
      <option value="draw">画一个新的特征</option>
    </select>
  </div>
</template>

<script>
export default {
  mounted() {
    let {
      format: { GeoJSON },
      Map,
      View,
      layer: { Vector: VectorLayer },
      source: { Vector: VectorSource },
      interaction: { Draw, Modify, Select, Snap },
      proj: { useGeographic },
    } = ol;
    useGeographic();

    const source = new VectorSource({
      url: "https://openlayers.org/data/vector/us-states.json",
      format: new GeoJSON(),
    });

    const map = new Map({
      target: this.$refs.map,
      layers: [
        new VectorLayer({
          background: "white",
          source: source,
        }),
      ],
      view: new View({
        center: [-100, 38.5],
        zoom: 4,
      }),
    });

    const select = new Select();

    const modify = new Modify({
      features: select.getFeatures(),
    });

    const draw = new Draw({
      type: "Polygon",
      source: source,
    });

    const snap = new Snap({
      source: source,
    });

    function removeInteractions() {
      map.removeInteraction(modify);
      map.removeInteraction(select);
      map.removeInteraction(draw);
      map.removeInteraction(select);
    }

    const mode = this.$refs.mode;
    function onChange() {
      removeInteractions();
      switch (mode.value) {
        case "draw": {
          map.addInteraction(draw);
          map.addInteraction(snap);
          break;
        }
        case "modify": {
          map.addInteraction(select);
          map.addInteraction(modify);
          map.addInteraction(snap);
          break;
        }
        default: {
          // pass
        }
      }
    }
    mode.addEventListener("change", onChange);
    onChange();
  },
};
</script>
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# 4.手绘

查看代码详情 
<template>
  <div>
    <div ref="map" class="map"></div>
    <form class="form-inline">
      <label for="type">几何类型 &nbsp;</label>
      <select ref="type">
        <option value="LineString">线条</option>
        <option value="Polygon">多边形</option>
        <option value="Circle">圆圈</option>
        <option value="None">无</option>
      </select>
    </form>
  </div>
</template>

<script>
export default {
  mounted() {
    let {
      Feature,
      interaction: { Draw },
      Map,
      View,
      layer: { Tile: TileLayer, Vector: VectorLayer },
      source: { OSM, Vector: VectorSource },
    } = ol;
    const raster = new TileLayer({
      source: new OSM(),
    });
    const source = new VectorSource({ wrapX: false });
    const vector = new VectorLayer({
      source: source,
    });
    const map = new Map({
      layers: [raster, vector],
      target: this.$refs.map,
      view: new View({
        center: [12579156, 3274244],
        zoom: 3,
      }),
    });
    const typeSelect = this.$refs.type;
    let draw;
    function addInteraction() {
      const value = typeSelect.value;
      if (value !== "None") {
        draw = new Draw({
          source: source,
          type: typeSelect.value,
          freehand: true,
        });
        draw.on("drawend", function (e) {
          const geometry = e.feature.getGeometry();
          const corrdinates = geometry.getCoordinates();
          console.log(corrdinates);
          // map.removeInteraction(draw)
          // map.removeInteraction(snap)
        });
        map.addInteraction(draw);
      }
    }
    typeSelect.onchange = function () {
      map.removeInteraction(draw);
      addInteraction();
    };
    addInteraction();
  },
};
</script>
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# 5.绘制形状

查看代码详情 
<template>
  <div>
    <div ref="map" class="map"></div>
    <form class="form-inline">
      <label for="type">形状类型: &nbsp;</label>
      <select ref="type">
        <option value="Circle">圆</option>
        <option value="Square">正方形</option>
        <option value="Box">长方形</option>
        <option value="Star">星星</option>
        <option value="None">无</option>
      </select>
      <input type="button" value="撤销" ref="undo" />
    </form>
  </div>
</template>

<script>
export default {
  mounted() {
    let {
      geom: { Polygon },
      Map,
      View,
      layer: { Tile: TileLayer, Vector: VectorLayer },
      source: { OSM, Vector: VectorSource },
      interaction: {
        Draw: { createBox, createRegularPolygon },
      },
    } = ol;
    const raster = new TileLayer({
      source: new OSM(),
    });
    const source = new VectorSource({ wrapX: false });
    const vector = new VectorLayer({
      source: source,
    });
    const map = new Map({
      layers: [raster, vector],
      target: this.$refs.map,
      view: new View({
        center: [-11000000, 4600000],
        zoom: 4,
      }),
    });
    const typeSelect = this.$refs.type;
    let draw;
    function addInteraction() {
      let value = typeSelect.value;
      if (value !== "None") {
        let geometryFunction;
        if (value === "Square") {
          value = "Circle";
          geometryFunction = createRegularPolygon(4);
        } else if (value === "Box") {
          value = "Circle";
          geometryFunction = createBox();
        } else if (value === "Star") {
          value = "Circle";
          geometryFunction = function (coordinates, geometry) {
            const center = coordinates[0];
            const last = coordinates[coordinates.length - 1];
            const dx = center[0] - last[0];
            const dy = center[1] - last[1];
            const radius = Math.sqrt(dx * dx + dy * dy);
            const rotation = Math.atan2(dy, dx);
            const newCoordinates = [];
            const numPoints = 12;
            for (let i = 0; i < numPoints; ++i) {
              const angle = rotation + (i * 2 * Math.PI) / numPoints;
              const fraction = i % 2 === 0 ? 1 : 0.5;
              const offsetX = radius * fraction * Math.cos(angle);
              const offsetY = radius * fraction * Math.sin(angle);
              newCoordinates.push([center[0] + offsetX, center[1] + offsetY]);
            }
            newCoordinates.push(newCoordinates[0].slice());
            if (!geometry) {
              geometry = new Polygon([newCoordinates]);
            } else {
              geometry.setCoordinates([newCoordinates]);
            }
            return geometry;
          };
        }
        draw = new ol.interaction.Draw({
          source: source,
          type: value,
          geometryFunction: geometryFunction,
        });
        map.addInteraction(draw);
      }
    }
    typeSelect.onchange = function () {
      map.removeInteraction(draw);
      addInteraction();
    };
    this.$refs.undo.addEventListener("click", function () {
      draw.removeLastPoint();
    });
    addInteraction();
  },
};
</script>
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← 七.比例线 →