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VectorDraw Developer Framework（VDF）是一个用于应用程序可视化的图形引擎库。有了VDF提供的功能，您可以轻松地创建、编辑、管理、输出、输入和打印2D和3D图形文件。该库还支持许多矢量和栅格输入和输出格式，包括本地PDF和SVG导出。

点击下载VectorDraw Developer Framework

问：如何删除Layer1的所有实体？

答：在下面的示例中，我们从所有布局和块中删除所有引用Layer1的实体，因此，如果一个块包含来自多个图层的实体，则将删除引用第1层的实体。

 //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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