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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。

【VectorDraw Developer Framework最新版下载】

VectorDraw web library (javascript)是一个矢量图形库。VectorDraw web library (javascript)不仅能打开CAD图纸，而且能显示任何支持HTML5标准平台上的通用矢量对象，如Windows，安卓，iOS和Linux。无需任何安装，VectorDraw web library (javascript)就可以运行在任何支持canvas标签和Javascript的主流浏览器（Chrome, Firefox, Safari, Opera, Dolphin, Boat等等）中。

【VectorDraw web library (javascript)最新版下载】

一. 按图层更改实体的顺序

问：我想更改某些实体的顺序，以便在2D中绘制其他实体。例如，层“TEXT”和“DIMS”中的vdTexts和vdDimensions对象我想将它们设置为实体列表的后面，以便它们在其他实体之上绘制。我尝试在for ...循环中使用ChangeOrder方法，但速度非常慢。我怎么才能更快地做到这一点？

答：绘制对象的顺序定义如下：

- 在2D中：添加的最后一个对象（在实体列表中，而不是在图层列表中）绘制在上一个对象的顶部

- 在3D中：对象的坐标指定哪个将在顶部。

因此，在2D中，你必须要更改这些实体的顺序才行。你可以使用InsertAt / RemoveAt和ChangeOrder方法或交换方法来交换集合中两个对象的位置。在Wrapper中，你可以使用ChangeOrder / MoveBefore / MoveAfter Subs。

如果你要检查很多图层和实体，而不是使用ChangeOrder或Swap，那么你可以尝试以下代码：

                vdArray<vdLayer> layers = new vdArray<vdLayer>();
                layers.AddItem(doc.Layers.FindName("1")); // here you add the layers with the order you want
                layers.AddItem(doc.Layers.FindName("DIMS"));  // the order of the layers here is significant
                layers.AddItem(doc.Layers.FindName("TEXTS"));  // and defines the order that the entities will have and drawn in 2D

                // if the drawing has the layers 0, 1, 2, 3, TEXTS, 4, DIMS, 5 then then entities draw order in 2D after 
                // this code will be [entities in any layers 0,2,3,4,5][entities in Layer 1][entities in layer DIMS][entities in Layer TEXTS]

                layers.MakeIndexDictionary(); // speeds up swaping and search 
                doc.Model.Entities.MakeIndexDictionary(); // speeds up swaping and search
                int pos1 = 0;
                int pos2 = 0;
                for (int i = 0; i < doc.Model.Entities.Count; i++)
                {
                    vdFigure fig1 = doc.Model.Entities[i];
                    pos1 = layers.GetObjectRealPosition(fig1.Layer);
                    for (int k = i + 1; k < doc.Model.Entities.Count; k++)
                    {
                        vdFigure fig2 = doc.Model.Entities[k];
                        pos2 = layers.GetObjectRealPosition(fig2.Layer);
                        
                        if (pos1 > pos2) 
                        {
                            doc.Model.Entities.swap(fig1, fig2);
                        }
                    }
                }
                doc.Model.Entities.ClearIndexDictionary(); // must follow a doc.Model.Entities.MakeIndexDictionary
                layers.ClearIndexDictionary(); // must follow a layers.MakeIndexDictionary

或者，你可以使用排序类并对数组中的所有实体（System.Collections.ArrayList）进行排序，并将这些实体（已排序）重新添加回绘图，如：

        internal class ItemSort : System.Collections.IComparer
        {
            vdFigure mfig;
            int mpos;
            ulong handle;
            public ulong Handle { get { return handle; } }
            public vdFigure Fig { get { return mfig; } }
            public ItemSort() { }
            public ItemSort(vdFigure fig, int pos)
            {
                mfig = fig;
                mpos = pos;
                handle = mfig.Handle.Value; // Keep the handle because the RemoveAll sets the handle to 0 !!
            }
            public int Compare(object x, object y)
            {
                return (((ItemShort)x).mpos - ((ItemShort)y).mpos);
            }
        }
.....
                vdArray<vdLayer> layers = new vdArray<vdLayer>();
                layers.AddItem(doc.Layers.FindName("0")); // here you add the layers with the order you want
                layers.AddItem(doc.Layers.FindName("2")); // here you add the layers with the order you want
                layers.AddItem(doc.Layers.FindName("1")); // here you add the layers with the order you want
                layers.AddItem(doc.Layers.FindName("DIMS"));  // the order of the layers here is significant
                layers.AddItem(doc.Layers.FindName("TEXTS"));  // and defines the order that the entities will have and drawn in 2D

                // if the drawing has the layers 0, 1, TEXTS, 2 and DIMS then then entities draw order in 2D after 
                // this code will be [entities in any layer 0][entities in any layer 2][entities in Layer 1][entities in layer DIMS][entities in Layer TEXTS]


                layers.MakeIndexDictionary(); // speeds up swaping and search 
                System.Collections.ArrayList lst = new System.Collections.ArrayList();
                foreach (vdFigure fig in doc.Model.Entities)
                {
                    lst.Add(new ItemShort(fig, layers.GetObjectRealPosition(fig.Layer)));
                }
                layers.ClearIndexDictionary();
                lst.Sort(new ItemSort()); // sort items
                doc.Model.Entities.RemoveAll(); //remove all entities from the model that have the "bad order"
                foreach (ItemShort item in lst)
                {
                    item.Fig.Handle.InternalSetValue(item.Handle); // set the handle back cause it is lost with RemoveAll
                    doc.Model.Entities.AddItem(item.Fig); //and re-add the entities with the order 
                }

在版本6019Beta7及更高版本中，有一种新方法Sort（）可用于代替上述代码段。详情如下：

在版本6019中，在vdArray对象和vdEntities集合中添加了新的排序方法。代码如下：

VectorDraw.Generics.vdArray<T> sort methods
        /// <summary>
        /// Sorts the elements in an entire collection using the <see cref="System.IComparable<T>"/>
        ///     generic interface implementation of each element of the System.Array.
        /// </summary>
        /// <exception cref="System.InvalidOperationException">One or more elements in array do not implement the <see cref="System.IComparable<T>"/>  generic interface.</exception>
        public void Sort()

        example:
        sort items in a collection of doubles
                vdArray<double> collectionOfDoubles = new vdArray<double>();
                collectionOfDoubles.AddItem(5);
                collectionOfDoubles.AddItem(15);
                collectionOfDoubles.AddItem(2);
                collectionOfDoubles.AddItem(8);
                collectionOfDoubles.AddItem(3);

                //sort the items from smaller value to bigger
                collectionOfDoubles.Sort();
                //the values will be take the following order
                //2 ,3, 5, 8, 15

 


        /// <summary>
        ///  Sorts the elements in a range of elements in entire collection using the specified
        ///     <see cref="System.Collections.Generic.IComparer<T>"/> generic interface.
        /// </summary>
        /// <param name="comparer">
        /// The <see cref="System.Collections.Generic.IComparer<T>"/> generic interface implementation
        ///     to use when comparing elements, or null to use the <see cref="System.IComparable<T>"/>
        ///     generic interface implementation of each element.
        /// </param>
        /// <exception cref="System.ArgumentException">
        /// The implementation of comparer caused an error during the sort. 
        /// For example, comparer might not return 0 when comparing an item with itself.
        /// </exception>
        /// <exception cref="System.InvalidOperationException">
        /// comparer is null, and one or more elements in array do not implement the <see cref="System.IComparable<T>"/>  generic interface
        /// </exception>
        public void Sort(IComparer<T> comparer)
        example:
        sort items in a collection of gPoints depend of their distance from an origin point.


                 private class OriginComparer : System.Collections.Generic.IComparer<gPoint>
                 {
                    gPoint mOrigin;
                    public OriginComparer(gPoint Origin)
                    {
                        mOrigin = Origin;
                    }
                    public int Compare(gPoint x, gPoint y)
                    {
                        double dif = x.Distance3D(mOrigin) - y.Distance3D(mOrigin);
                        if (dif == 0.0d) return 0;
                        if (dif > 0.0d) return 1;
                        else return -1;
                    }
                 }
         
                vdArray<gPoint> collectionOfPoints = new vdArray<gPoint>();
                collectionOfPoints.AddItem(new gPoint(5,0,0));
                collectionOfPoints.AddItem(new gPoint(15, 0, 0));
                collectionOfPoints.AddItem(new gPoint(2, 0, 0));
                collectionOfPoints.AddItem(new gPoint(8, 0, 0));
                collectionOfPoints.AddItem(new gPoint(3, 0, 0));

                //sort the items from smaller to bigger depend of their distance from point(0,0,0)
                collectionOfPoints.Sort(new OriginComparer(new gPoint(0, 0, 0)));
                //the values will be take the following order
                //(2,0,0) ,(3,0,0), (5,0,0), (8,0,0), (15,0,0)


VectorDraw.Professional.vdCollections.vdEntities sort methods
        /// <summary>
        ///  Sorts the elements in a range of elements in entire collection using the specified
        ///     <see cref="System.Collections.Generic.IComparer<vdFigure>"/> generic interface.
        /// </summary>
        /// <param name="comparer">
        /// The <see cref="System.Collections.Generic.IComparer<vdFigure>"/> generic interface implementation
        ///     to use when comparing elements, or null to use the <see cref="System.IComparable<vdFigure>"/>
        ///     generic interface implementation of each element.
        /// </param>
        /// <exception cref="System.ArgumentException">
        /// The implementation of comparer caused an error during the sort. 
        /// For example, comparer might not return 0 when comparing an item with itself.
        /// </exception>
        /// <exception cref="System.InvalidOperationException">
        /// comparer is null, and one or more elements in array do not implement the <see cref="System.IComparable<vdFigure>"/>  generic interface
        /// </exception>
        public void Sort(IComparer<vdFigure> comparer)
        example:
        sort items in vdEntities collection depend of their Layer name.
                  //a class object that used to compare to vdFigure depend of the Layer Name
                  private class FigureLayerComparer : System.Collections.Generic.IComparer<vdFigure>
                  {
                    public FigureLayerComparer()
                    {
                    }
                    public int Compare(vdFigure fig1, vdFigure fig2)
                    {
                        return System.StringComparer.InvariantCultureIgnoreCase.Compare(fig1.Layer.ToString(), fig2.Layer.ToString());
                    }
                  }
                //Create 4 layers and add them into the Layers collection of a vdDocument object
                vdLayer lay1 = doc.Layers.Add("1");
                vdLayer lay2 = doc.Layers.Add("2");
                vdLayer lay3 = doc.Layers.Add("3");
                vdLayer lay4 = doc.Layers.Add("4");

                //create a new vdLine object that belong to Layer with name "3"
                vdLine l1 = new vdLine();
                l1.SetUnRegisterDocument(doc);
                l1.setDocumentDefaults();
                l1.Layer = lay3;

               //create a new vdLine object that belong to Layer with name "1"
                vdLine l2 = new vdLine();
                l2.SetUnRegisterDocument(doc);
                l2.setDocumentDefaults();
                l2.Layer = lay1;

                //create a new vdLine object that belong to Layer with name "4"
                vdLine l3 = new vdLine();
                l3.SetUnRegisterDocument(doc);
                l3.setDocumentDefaults();
                l3.Layer = lay4;

                //create a new vdLine object that belong to Layer with name "2"
                vdLine l4 = new vdLine();
                l4.SetUnRegisterDocument(doc);
                l4.setDocumentDefaults();
                l4.Layer = lay2;

                //add the new vdlines to vdDocument Model Entities collection
                doc.Model.Entities.AddItem(l1);
                doc.Model.Entities.AddItem(l2);
                doc.Model.Entities.AddItem(l3);
                doc.Model.Entities.AddItem(l4);

                //change the order of items in the collection so the items of layer "1" to be first in the collection folow by items in layer "2" , "3" and "4" at the end of the collection
                doc.Model.Entities.Sort(new FigureLayerComparer());

二. 制作复制命令以执行所选项目的多个副本

问：如何制作复制命令以执行所选项目的多个副本。例如，复制完选择后，复制命令不会结束，并且保持活动状态以继续复制相同的选择活动？

答：你可以通过创建自己的命令来完成此操作。在这种情况下，请尝试以下代码：

        private void button2_Click(object sender, EventArgs e)
        {
            bool flag = MultipleCopy(vdFramedControl1.BaseControl.ActiveDocument);
            this.Text = flag.ToString();
        }

        private Boolean MultipleCopy(vdDocument doc)
        {
            bool isCopy = true;
            doc.Prompt("Select Entities to copy: ");
            if (!doc.CommandAction.CmdSelect("USER"))
            {
                doc.Prompt("");
                return false;
            }
            vdSelection sel = doc.Selections.FindName("VDRAW_PREVIOUS_SELSET");
            if ((sel == null) | (sel.Count < 1)) return false;
            doc.Prompt("Copy from Point: ");
            gPoint ptFrom = doc.ActionUtility.getUserPoint() as gPoint;
            if ((ptFrom == null))
            {
                doc.Prompt("");
                return false;
            }
            int i = 0;
            while (isCopy)
            {
                isCopy = doc.CommandAction.CmdCopy(sel, ptFrom, "USER");
                if ((i==0) & (isCopy==false))
                {
                 doc.Prompt("");
                 return false;
                }
                i++;
            }
            doc.Prompt("");
            return true;
        }

未完待续~

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