文档半岛外围网上直营>>VectorDraw教程>>新手入门必看：VectorDraw 常见问题整理大全（十八）
新手入门必看：VectorDraw 常见问题整理大全（十八）
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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