JavaScript ArcGIS PolygonDrawAction用法及代码示例

基本信息

以下是所在类或对象的基本信息。

用法说明

例子：

function enableCreatePolygon(draw, view) {
  let action = draw.create("polygon");

  // PolygonDrawAction.vertex-add
  // Fires when user clicks, or presses the "F" key.
  // Can also be triggered when the "R" key is pressed to redo.
  action.on("vertex-add", function (evt) {
    createPolygonGraphic(evt.vertices);
  });

  // PolygonDrawAction.vertex-remove
  // Fires when the "Z" key is pressed to undo the last added vertex
  action.on("vertex-remove", function (evt) {
    createPolygonGraphic(evt.vertices);
  });

  // Fires when the pointer moves over the view
  action.on("cursor-update", function (evt) {
    createPolygonGraphic(evt.vertices);
  });

  // Add a graphic representing the completed polygon
  // when user double-clicks on the view or presses the "C" key
  action.on("draw-complete", function (evt) {
    createPolygonGraphic(evt.vertices);
  });
}

function createPolygonGraphic(vertices){
  view.graphics.removeAll();
  let polygon = {
    type: "polygon", // autocasts as Polygon
    rings: vertices,
    spatialReference: view.spatialReference
  };

  let graphic = new Graphic({
    geometry: polygon,
    symbol: {
      type: "simple-fill", // autocasts as SimpleFillSymbol
      color: "purple",
      style: "solid",
      outline: {  // autocasts as SimpleLineSymbol
        color: "white",
        width: 1
      }
    }
  });
  view.graphics.add(graphic);
}