新手入门必看：VectorDraw 常见问题整理大全（四）

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. 在包装器组件中使用新对象和功能

问：如何在包装器组件中使用新对象和功能？

答：包装器组件是一个COM ActiveX，可以在vd6和c ++ 6等环境中使用。我们已经实现了.tlb文件，这些文件可以添加到项目的引用中，并且可以为您的应用程序提供新组件的功能。

导出的tlb文件：VectorDraw.Serialize.tlbVectorDraw.Render.tlbVectorDraw.Professional.tlbVectorDraw.Geometry.tlbVectorDraw.Actions.tlbVdrawPro5.tlbvdrawi5.tlbvdPropertyGrid.tlbVdProControl.tlb

下面的代码示例实现了包装器组件，其中使用按钮我们添加了一个vdMtext对象，这是一个全新的对象，它在我们的新库中实现，并且在版本5中不存在。

对于这个实现，我们导入了VectorDraw.Geometry .tlb，VectorDraw.Professional.tlb以及vdrawi5.tlb

VB6代码示例：

Private Sub Command1_Click()
'Get the document interface of VectorDraw FrameWork
   Dim doc As VectorDraw_Professional.vdDocument
   Set doc = VDraw1.ActiveDocument.WrapperObject
'Create a new Mtext object with VDF Interfaces
   Dim mtext As VectorDraw_Professional.vdMText
   Set mtext = New VectorDraw_Professional.vdMText

   'typecast the Mtext as vdbaseObject
   Dim baseobj As VectorDraw_Professional.vdBaseObject
   Set baseobj = mtext
   baseobj.SetUnRegisterDocument doc
   'typecast the Mtext as vdPrimary
   Dim primary As VectorDraw_Professional.vdPrimary
   Set primary = mtext
   primary.setDocumentDefaults

   'Create a gPoint object
   Dim pt As VectorDraw_Geometry.gPoint
   Set pt = New VectorDraw_Geometry.gPoint
   pt.SetValue 2, 3, 0
   'set values in some properties of mtext
   mtext.TextString = "VectorDraw Mtext using VDF Interfaces"
   Set mtext.InsertionPoint = pt
   mtext.BoxWidth = 12
   mtext.Height = 1#

   'typecast the Mtext as vdFigure
   Dim fig As VectorDraw_Professional.vdFigure
   Set fig = mtext
   'add mtext in the collection entities table
   doc.ActiveLayOut.entities.AddItem fig

   primary.Update
   fig.Invalidate
   VDraw1.CommandAction.Zoom "e", 0, 0
End Sub

C ++代码示例：

void Cvd6WrapperDlg::OnBnClickedMtext()
{
//Get the document interface of VectorDraw FrameWork
   VectorDraw_Professional::IvdDocumentPtr doc =       m_vdraw.GetActiveDocument().GetWrapperObject();

//Create a new Mtext object with VectorDraw FrameWork Interfaces
   VectorDraw_Professional::IvdMTextPtr    mtext(__uuidof(VectorDraw_Professional::vdMText));

//typecast the Mtext as vdbaseObject
   VectorDraw_Professional::IvdBaseObjectPtr baseobj =    (VectorDraw_Professional::IvdBaseObjectPtr)mtext;
   baseobj->SetUnRegisterDocument(doc);

//typecast the Mtext as vdPrimary
   VectorDraw_Professional::IvdPrimaryPtr primary = (VectorDraw_Professional::IvdPrimaryPtr)mtext;
   primary->setDocumentDefaults();

//Create a gPoint object;
   VectorDraw_Geometry::IgPointPtr pt(__uuidof(VectorDraw_Geometry::gPoint));
pt->SetValue(2,3,0);

//set values in some properties of mtext
   mtext->PutRefInsertionPoint(pt);
   mtext->PutTextString("Vectordraw Mtext using VectorDrawFramework Interfaces");
   mtext->PutBoxWidth(12);
   mtext->PutHeight(1.0);

//typecast the Mtext as vdFigure
   VectorDraw_Professional::IvdFigurePtr figure = (VectorDraw_Professional::IvdFigurePtr)mtext;

//add mtext in the collection entities table
   doc->ActiveLayOut->Entities->AddItem(figure);
   primary->Update();
   figure->Invalidate();
  m_vdraw.GetCommandAction().Zoom(COleVariant(_T("e")),COleVariant(),COleVariant());
}

Delphi 7代码示例：

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls, SHDocVw, AxCtrls, OleCtrls,
VDrawLib5_TLB, VDrawI5_TLB, VectorDraw_Professional_TLB, VectorDraw_Geometry_TLB;



procedure TForm1.Button1Click(Sender: TObject);
var
   mtext : VectorDraw_Professional_TLB.IvdMText;
   pt : VectorDraw_Geometry_TLB.Igpoint;
   doc : VectorDraw_Professional_TLB.IvdDocument;
   primary : VectorDraw_Professional_TLB.IvdPrimary;
   baseobject : VectorDraw_Professional_TLB.IvdBaseObject;

begin
   doc := vdrawpro.ActiveDocument.WrapperObject as VectorDraw_Professional_TLB.IvdDocument;
   pt := VectorDraw_Geometry_TLB.CogPoint.Create();
   pt.SetValue(2,3,0);
   mtext := VectorDraw_Professional_TLB.CovdMText.Create();
   baseobject := mtext as VectorDraw_Professional_TLB.IvdBaseObject;
   baseobject.SetUnRegisterDocument(doc);
   primary:=mtext as VectorDraw_Professional_TLB.IvdPrimary;
   primary.setDocumentDefaults();
   mtext.TextString := 'VectorDraw Mtext using VDF Interfaces';
   mtext.InsertionPoint := pt;
   mtext.BoxWidth := 12;
   mtext.Height := 1;
   doc.ActiveLayOut.entities.AddItem(mtext as VectorDraw_Professional_TLB.IvdFigure);
   vdrawpro.CommandAction.Zoom('E',0,0);
end;
procedure TForm1.Button2Click(Sender: TObject);
var vdGPts : VectorDraw_Geometry_TLB.Igpoints;
  doc : VectorDraw_Professional_TLB.IvdDocument;
  primary : VectorDraw_Professional_TLB.IvdPrimary;
  baseobject : VectorDraw_Professional_TLB.IvdBaseObject;
  vdGPt : VectorDraw_Geometry_TLB.Igpoint;
  GS : VectorDraw_Professional_TLB.IvdGroundSurface;
  I : integer;

begin
  vdraw1.DisplayFrames:=63;
  vdraw1.StatusBar:=true;
  vdraw1.StatusBarMenu:=true;
  vdraw1.EnableAutoGripOn:=true;

  doc := vdraw1.ActiveDocument.WrapperObject as VectorDraw_Professional_TLB.IvdDocument;

  vdGPts := VectorDraw_Geometry_TLB.CogPoints.Create();
  for I:=1 to 8 do // create a ground sourface from 8 points
  begin
    vdGPt := VectorDraw_Geometry_TLB.CogPoint.Create();
    vdGPts.Add(vdGpt);
  end;

  vdGPTs.Item[0].SetValue(2,3,0);
  vdGPTs.Item[1].SetValue(2,5,1);
  vdGPTs.Item[2].SetValue(4,5,1.5);
  vdGPTs.Item[3].SetValue(4,3,1);
  vdGPTs.Item[4].SetValue(7,3,2);
  vdGPTs.Item[5].SetValue(7,5,0.5);
  vdGPTs.Item[6].SetValue(9,3,0.3);
  vdGPTs.Item[7].SetValue(9,5,0.5);

  GS := VectorDraw_Professional_TLB.CovdGroundSurface.Create();
  baseobject := GS as VectorDraw_Professional_TLB.IvdBaseObject;
  baseobject.SetUnRegisterDocument(doc);
  primary:=GS as VectorDraw_Professional_TLB.IvdPrimary;
  primary.setDocumentDefaults();
  GS.Points := vdGPts;
  GS.MeshSize := 0.1;
  GS.DispMode := DisplayMode_Mesh;//DisplayMode_Triangle;
  doc.ActiveLayOut.entities.AddItem(GS as VectorDraw_Professional_TLB.IvdFigure);
  vdraw1.CommandAction.View3D('VISE');
  vdraw1.CommandAction.Zoom('E',0,0);
end;

二. 计算用户在3D中单击多边形的点

问：如何计算用户在3D中单击多边形的点？

答：在下面的代码示例中，我们要求用户单击一个点。我们检查用户是否单击了一个多边形。从这一点开始，我们计算出一条从用户的"eye"和内部开始的线。我们计算此线与找到的多面的所有面的交点。然后我们排除所有不属于脸部的点，我们选择更接近用户“eye”的点。

Important Functions Used : Intersection3DSegmentPlane,PointInTriangle, CalculateExtrution  can be found in VectorDraw.Geometry.Globals.

private void button4_Click(object sender, EventArgs e)
{
vdDocument doc = vdFramedControl1.BaseControl.ActiveDocument;
gPoint userpt = null;
//Get a point from the user
VectorDraw.Actions.StatusCode s= doc.ActionUtility.getUserPointDCS(out userpt);
if (s == VectorDraw.Actions.StatusCode.Success)
{
//Find the polyface the user clicked.
gPoint tmppt = doc.View2PixelMatrix.Transform(userpt);
Point screenpt = new Point((int)tmppt.x, (int)tmppt.y);
//This function it is recommended not to go to the Mouse Down event(it might slow down your application)
//It is recommended to create a button function to do this like this one.
vdEntities ents = doc.Select3d(screenpt, doc.GlobalRenderProperties.PickSize);
if (ents.Count != 0)
{
vdPolyface polyface = ents[0] as vdPolyface;
if (polyface != null)
{
//Calculate the biggest z value of the polyface.
double val = 0.0;
foreach (gPoint var in polyface.VertexList)
{
if (val < var.z) val = var.z;
}
//Calculate the line that starts from the point that the user clicked and goes "inside the screen" to intersect the face. 
gPoint world = doc.View2WorldMatrix.Transform(userpt);
gPoint linept1 = world - (val * 10.0) * doc.ActiveLayOut.ViewDir;
gPoint linept2 = world + (val*10.0)*doc.ActiveLayOut.ViewDir;
gPoints FoundPoints = new gPoints();
int count = 1;
foreach (int var in polyface.FaceList)
{
count++;
if (count % 5 == 0)
{
//4 points of the face.
gPoint pt1 = polyface.VertexList[polyface.FaceList[count - 5] - 1];
gPoint pt2 = polyface.VertexList[polyface.FaceList[count - 4] - 1];
gPoint pt3 = polyface.VertexList[polyface.FaceList[count - 3] - 1];
gPoint pt4 = polyface.VertexList[polyface.FaceList[count - 2] - 1];
//Calculate the perpedicular vector of the plane of the face.
Vector v = new Vector();
v.CalculateExtrution(pt1, pt2,pt3);
//Calculate the intersection point of the plane with the above calculated line
gPoint ret1 = new gPoint();
int j = VectorDraw.Geometry.Globals.Intersection3DSegmentPlane(linept1, linept2, v, pt1, out ret1);
if (j != 0)
{
bool triangle1 = VectorDraw.Geometry.Globals.PointInTriangle(doc.World2ViewMatrix.Transform (ret1),doc.World2ViewMatrix.Transform ( pt1), doc.World2ViewMatrix.Transform (pt2), doc.World2ViewMatrix.Transform (pt3));
bool triangle2 = VectorDraw.Geometry.Globals.PointInTriangle(doc.World2ViewMatrix.Transform (ret1),doc.World2ViewMatrix.Transform ( pt1),doc.World2ViewMatrix.Transform ( pt3), doc.World2ViewMatrix.Transform (pt4));
if (triangle1 || triangle2) //If the point belongs to any of the triangles then belongs to the face.
{
//Add the found point to this list.
FoundPoints.Add(ret1);
}
}
}
}
//Debug Add a vdPoint for each point found.
foreach (gPoint var in FoundPoints)
{
vdPoint vdpt = new vdPoint();
vdpt.SetUnRegisterDocument(doc);
vdpt.setDocumentDefaults();
vdpt.PenColor.ColorIndex = 2;
vdpt.InsertionPoint = var;
doc.ActiveLayOut.Entities.AddItem(vdpt);
vdpt.Invalidate();
}
//This is for debug purposes we will add the calculated line and the Found Point.
vdLine line = new vdLine(linept1, linept2);
line.SetUnRegisterDocument(doc);
line.setDocumentDefaults();
line.PenColor.ColorIndex = 0;
doc.ActiveLayOut.Entities.AddItem(line);
line.Invalidate();

//Now we will choose the point that has the less distance from linept2
int index = 0;
int indexFound = 0;
double dist = linept1.Distance3D(linept2); //We start from the biggest distance
foreach (gPoint var in FoundPoints)
{
double dist1 = var.Distance3D(linept2);
if (dist1 < dist)
{
indexFound = index;
dist = dist1;
}
index++;
}
//Add the Found point with different color.
vdPoint vdpt1 = new vdPoint();
vdpt1.SetUnRegisterDocument(doc);
vdpt1.setDocumentDefaults();
vdpt1.PenColor.ColorIndex = 3;
vdpt1.InsertionPoint = FoundPoints[indexFound];
doc.ActiveLayOut.Entities.AddItem(vdpt1);
vdpt1.Invalidate();
}
}
}
}

未完待续......