繪制形狀時樣式OpenLayers 3光標

Question

我有一個功能，允許用戶在OpenLayers地圖上繪制正方形或矩形。 我想更改光標的樣式。 默認情況下，光標為藍色圓圈。 我想將其更改為正方形，以便符號系統與用戶可能創建的形狀匹配。

該解決方案涉及添加樣式屬性。 我需要有關如何為非圖像游標實現樣式屬性的細節，該游標類似於默認的藍色圓圈，而是一個正方形。 謝謝！

$scope.drawBoundingBox = () => {
    const bbVector = new ol.source.Vector({ wrapX: false });
    const vector = new ol.layer.Vector({
      source: bbVector
    });
    bbVector.on("addfeature", evt => {
      $scope.coords = evt.feature.getGeometry().getCoordinates();
    });
    const style = new ol.style.Style({
      stroke: new ol.style.Stroke({
        color: "#FFF",
        width: 3
      }),
      fill: new ol.style.Fill({
        color: [255, 255, 255, 0]
      })
    });
    const geometryFunction = ol.interaction.Draw.createRegularPolygon(4);
    draw = new ol.interaction.Draw({
      source: bbVector,
      type: "Circle",
      geometryFunction
    });
    vector.set("name", "boundingBox");
    vector.setStyle(style);
    map.addLayer(vector);
    map.addInteraction(draw);
  };

Answer 1

這是一個有效的解決方案，它將默認的藍色圓圈光標更改為正方形，並允許用戶在地圖上創建正方形或矩形。

  $scope.drawBoundingBox = () => {
    const bbVector = new ol.source.Vector({ wrapX: false });
    const vector = new ol.layer.Vector({
      source: bbVector
    });
    bbVector.on("addfeature", evt => {
      $scope.coords = evt.feature.getGeometry().getCoordinates();
    });

    const geometryFunction = ol.interaction.Draw.createRegularPolygon(4);

    draw = new ol.interaction.Draw({
      source: bbVector,
      type: "Circle",
      geometryFunction: geometryFunction,
      style: new ol.style.Style({
        stroke: new ol.style.Stroke({
          color: "#FFF",
          width: 3
        }),
        fill: new ol.style.Fill({
          color: [255, 255, 255, 0]
        }),
        geometryFunction,
        image: new ol.style.RegularShape({
          fill: new ol.style.Fill({
            color: '#FFF'
          }),
          stroke: new ol.style.Stroke({
            color: "blue",
            width: 3
          }),
          points: 4,
          radius: 10,
          angle: Math.PI / 4
        }),
      }),
    });
    vector.set("name", "boundingBox");
    map.addLayer(vector);
    map.addInteraction(draw);
  };