VectorDraw Developer Framework（VDF）是一個(gè)用于應(yīng)用程序可視化的圖形引擎庫(kù)。有了VDF提供的功能，您可以輕松地創(chuàng)建、編輯、管理、輸出、輸入和打印2D和3D圖形文件。該庫(kù)還支持許多矢量和柵格輸入和輸出格式，包括本地PDF和SVG導(dǎo)出。

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問(wèn)：如何刪除Layer1的所有實(shí)體？

答：在下面的示例中，我們從所有布局和塊中刪除所有引用Layer1的實(shí)體，因此，如果一個(gè)塊包含來(lái)自多個(gè)圖層的實(shí)體，則將刪除引用第1層的實(shí)體。

 //returns the handle of the layer of the passed entity
       function GetEntityLayerHandle(vdrawobj, document, entity) {
           var ret = entity.Layer;
           if (!ret) {//if not exist asume that it belongs to Layer '0'
               ret = vdrawobj.FindLayer("0");
               if (!ret) ret = 'h_';
               else ret = "h_" + ret.HandleId.toString();
           }
           return ret;
       }
       //set the Deleted property of the entities that belongs to layer with passed layerHandle, to true
       //Note: Entities with Deleted == true are not draw and they are not saved
       function deleteEntitiesOnLayer(vdrawobj,document, handlecollection, layerHandle) {
           for (var i = 0; i < handlecollection.Items.length; i++) {
               var ent = vdrawobj.GetDictItem(handlecollection, handlecollection.Items[i]);
               if (!ent) continue;
               var layerentity = GetEntityLayerHandle(vdrawobj,document,ent);
               if (layerentity == layerHandle)
                   ent.Deleted = true;
           }
           
       }
 
       function test() {
           //Mark all the entities, of all layouts and all blocks, that have property Layer == Layer 1 handle as Deleted = true
           var layer1 = vdcanvas.FindLayer('Layer1');
           var layerHandle = "h_" + layer1.HandleId.toString();
           var vddoc = vdcanvas.GetDocument();
 
           deleteEntitiesOnLayer(vdcanvas, vddoc, vddoc.Model.Entities, layerHandle);
           if (vddoc.LayOuts) {
               for (var i = 0; i < vddoc.LayOuts.Items.length; i++) {
                   deleteEntitiesOnLayer(vdcanvas, vddoc, vddoc.LayOuts.Items[i].Entities, layerHandle);
               }
           }
           if (vddoc.Blocks) {
               for (var i = 0; i < vddoc.Blocks.Items.length; i++) {
                   var block = vdcanvas.GetDictItem(vddoc.Blocks, vddoc.Blocks.Items[i]);
                   if (!block) continue;
                   deleteEntitiesOnLayer(vdcanvas, vddoc, block.Entities, layerHandle);
               }
           }
           vdcanvas.UpdateLayout();
           setTimeout(vdcanvas.redraw);
       }

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