JavaScript ArcGIS BaseLayerView2D用法及代碼示例

基本信息

以下是所在類或對象的基本信息。

用法說明

例子：

let TileBorderLayerView2D = BaseLayerView2D.createSubclass({
   // Example of a render implementation that draws tile boundaries
   render(renderParameters) {
     let tileSize = this.layer.tileInfo.size[0];
     let state = renderParameters.state;
     let pixelRatio = state.pixelRatio;
     let width = state.size[0];
     let height = state.size[1];
     let context = renderParameters.context;
     let coords = [0, 0];

     context.fillStyle = "rgba(0,0,0,0.25)";
     context.fillRect(0, 0, width * pixelRatio, height * pixelRatio);

     // apply rotation for everything that will be applied to the canvas
     if (state.rotation !== 0) {
       context.translate(width * pixelRatio * 0.5, height * pixelRatio * 0.5);
       context.rotate((state.rotation * Math.PI) / 180);
       context.translate(- width * pixelRatio * 0.5, -height * pixelRatio * 0.5);
     }

     // Set the style for all the text.
     context.font = "24px monospace";
     context.fillStyle = "black";
     context.shadowBlur = 1;

     for (const tile of this.tiles) {
       let screenScale = tile.resolution / state.resolution * pixelRatio;

       state.toScreenNoRotation(coords, tile.coords);

       // Draw the tile boundaries
       context.strokeRect(coords[0], coords[1], tileSize * screenScale, tileSize * screenScale);

       // Draw the tile information
       context.shadowColor = "white";
       context.fillText(
         tile.level + "/" + tile.row + "/" + tile.col + "/" + tile.world,
         coords[0] + 12,
         coords[1] + 24,
         tileSize * screenScale
       );
       context.shadowColor = "transparent";
     }
   }
 });

 let CustomTileLayer = Layer.createSubclass({
   tileInfo: TileInfo.create({ spatialReference: { wkid: 3857 }}),

   createLayerView(view) {
     if (view.type === "2d") {
       return new TileBorderLayerView2D({
         view: view,
         layer: this
       });
     }
   }
 });