新手入门必看：VectorDraw 常见问题整理大全（一）

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最新版下载可登录慧都网进行免费下载】

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)最新版下载可登录慧都网进行免费下载】

一. 导出背景色的SVG文件

问：是否可以导出背景颜色不同于白色的SVG文件？

答：可以通过一些代码行来指示VDF（VectorDraw Developer Framework）组件在OnDrawBackground事件中使用Palette的背景颜色，例如：

// the form conatins a vdFramedControl and a Button
 
bool isOnSVGSave = false; // use this global boolean in the form and make it true just before saving the SVG and then again to false after save is finished
 
private void button1_Click(object sender, EventArgs e)
{
    vdDocument doc = vdFramedControl.BaseControl.ActiveDocument;
 
    doc.Open(@"C:	estsimple1.vdml"); // open a test file
    doc.Palette.Background = Color.LightYellow; // change the background color
    doc.Palette.Forground = Color.DarkSlateGray; // and the foreground color
 
.....
.....
 
    isOnSVGSave = true; //set this flag to true before saving SVG
    doc.OnDrawBackground += new vdDocument.DrawBackgroundEventHandler(doc_OnDrawBackground); // enable the event
    doc.SaveAs(@"c:	estsvg1.svg"); // save the SVG
    doc.OnDrawBackground -= new vdDocument.DrawBackgroundEventHandler(doc_OnDrawBackground); // disable the event
    isOnSVGSave = false;//set this flag back to false after saving SVG
}
 
void doc_OnDrawBackground(object sender, vdRender render, ref bool cancel)
{
    if (isOnSVGSave && render!=null && render is RenderFormats.SvgRender) // check that is on "save" and render is SvgRender
    {
        cancel = true; // you need to pass this as tru
        render.Clear(vdFramedControl.BaseControl.ActiveDocument.Palette.Background); // clear the render and use the Palette’s Background color!
    }

二. 在非XY平面中创建polyhatch

问：如何在非X / Y平面中创建polyhatch？

答：在创建剖面线时，多边形曲线和剖面线应位于X / Y平面中，因此如果在相同但不是X / Y平面中有折线，则需要将它们“带”到X / Y平面，创建聚阴影线，然后让他们回到他们的平面。请看以下代码：

private void Test()
       {
           vdDocument doc = vdFramedControl.BaseControl.ActiveDocument;
           doc.New();
 
           #region create 2 random polylines
           // we will use two circles in order to get some random points from them to create the polylines.
           vdCircle cir1 = new vdCircle(doc, new gPoint(3, 2), 5);
           vdCircle cir2 = new vdCircle(doc, new gPoint(3, 2), 2);
           Vector vec = new Vector(0.3, 0.7, -0.2); vec.Normalize();
           cir1.ExtrusionVector = vec;
           cir2.ExtrusionVector = vec;
           // 2 circles are created in the same "random" plane
 
           // get some points from these just to "have" two polylines
           gPoints pts1 = cir1.geomMeasure(7); // points of 1st polyline
           gPoints pts2 = cir2.geomMeasure(4); // points of 2nd polyline
           #endregion
 
           Matrix mat = new Matrix(); // this is the matrix of the plane that the circles belong to
           mat.SetToViewDirection(vec, 0.0d);
           Matrix invmat = new Matrix(mat.GetInvertion());
 
           // create the curves for the polyhatch
           vdPolyline pl = new vdPolyline(doc, pts1);
 
           // vector should be perpendicular in the plane where the polyline is and can also calculated using CalculateNormal3P, like:
           Vector vec2 = new Vector();
           Vector.CalculateNormal3P(pl.VertexList[0] as gPoint, pl.VertexList[1] as gPoint, pl.VertexList[2] as gPoint, out vec2);
           // in this case we already have it from the circle, as we set it above.
 
           pl.ExtrusionVector = vec;
           pl.Flag = VdConstPlineFlag.PlFlagCLOSE;
           pl.Transformby(mat); // we need to bring these points to X/Y plane
           pl.Update();
 
           VectorDraw.Professional.vdCollections.vdCurves curves_Outer = new VectorDraw.Professional.vdCollections.vdCurves();
           curves_Outer.AddItem(pl);
 
           pl = new vdPolyline(doc, pts2);
           pl.ExtrusionVector = vec;
           pl.Flag = VdConstPlineFlag.PlFlagCLOSE;
           pl.Transformby(mat); pl.Update(); // we need to bring these points to X/Y plane
            
           VectorDraw.Professional.vdCollections.vdCurves curves_Inside = new VectorDraw.Professional.vdCollections.vdCurves();
           curves_Inside.AddItem(pl);
 
           //'create polyhatch
           vdPolyhatch onehatch = new vdPolyhatch(doc);
           onehatch.PolyCurves.AddItem(curves_Outer);
           onehatch.PolyCurves.AddItem(curves_Inside);
           onehatch.HatchProperties = new VectorDraw.Professional.vdObjects.vdHatchProperties(VectorDraw.Professional.Constants.VdConstFill.VdFillModeSolid);
 
           onehatch.Transformby(invmat); // bring this to the plane where the circles are.
           doc.Model.Entities.AddItem(onehatch);
 
           //just add the circles for display reasons. There is no need to add them
           cir1.PenColor.FromSystemColor(Color.Red);
           cir2.PenColor.FromSystemColor(Color.Red);
           doc.Model.Entities.AddItem(cir1);
           doc.Model.Entities.AddItem(cir2);
 
           doc.CommandAction.Zoom("E", 0, 0);
       }

三. 导出txt文件中的xyz坐标

问：如何将图形中的折线和折线的x，y，z数据导出到txt文件中？

答：VDF没有自动化此功能，但很容易从加载到VDF组件的任意图形中导出此txt文件。请参阅以下代码：

private void button1_Click(object sender, EventArgs e)
{
    vdDocument doc = vdFramedControl.BaseControl.ActiveDocument;
    doc.New();
    doc.Open(@"c:	estMyModel Layout_1.0.dxf");
 
    using (StreamWriter writer = new StreamWriter(doc.FileName+".txt")) //export c:	estMyModel Layout_1.0.dxf.txt file containing the points of lines and polylines only
    {
        foreach (vdFigure item in doc.Model.Entities)
        {
            if (item != null && item is vdLine)
            {
                writer.WriteLine("vdLine " + (item as vdLine).StartPoint.ToString() + " " + (item as vdLine).EndPoint.ToString());
            }
            if (item != null && item is vdPolyline)
            {
                writer.Write("vdPolyline ");
                foreach (Vertex item2 in (item as vdPolyline).VertexList)
                {
                    writer.Write(item2.AsgPoint().ToString() + " ");
                }
                writer.WriteLine(" ");
            }
        }
    }
}

您所需要的只是循环遍历文档中的所有对象（线，折线等）并获取其x，y，z值并使用StreamWriter将它们写入txt文件。

四. 如何覆盖折线的夹点

问：我想以不同的方式绘制折线的第一个夹点。我如何才能做到这一点？

答：以下是使用FigureDrawGrips事件执行此操作的示例：

..... // need to have these
doc.FreezeEntityDrawEvents.Push(false);
doc.OnFigureDrawGrips += new vdDocument.FigureDrawGripsEventHandler(doc_OnFigureDrawGrips);
....
and
        //overrides the default draw grip
        //draw the first grip of all vdFigures as red circle
        //and the others as rectangle using the default grip color
        void doc_OnFigureDrawGrips(object sender, vdRender render, ref bool cancel)
        {
            vdFigure fig = sender as vdFigure;
            if (fig == null) return;
  
            //calculate the circle points and grip box points relative to grip center.
            double half_viewsize = render.PixelSize * render.GlobalProperties.GripSize * 0.5d;
            gPoint offsetPoint = new gPoint(half_viewsize, half_viewsize);
            Box GripBox = new Box(offsetPoint * -1, offsetPoint);
            gPoints circlepts = Globals.GetArcSamplePoints(16, half_viewsize, 0, Globals.VD_TWOPI);
            Matrix morigin = new Matrix();
  
 
            gPoints pts = fig.GetGripPoints();//points are in world CS
  
            int i = 0;
            foreach (gPoint pt in pts)
            {
                if (!render.IsSectionVisible(pt)) continue;//check the 3d section clip visibility
                gPoint ptInView = render.CurrentMatrix.Transform(pt);
                System.Drawing.Point p = render.View2PixelMatrix.Transform2GDIPoint(ptInView);
                if (!render.Contains(p)) continue;//check if grip is inside the screen
  
                //initialize a new offset matrix represents the center of grip in current view CS
                morigin.IdentityMatrix();
                morigin.TranslateMatrix(ptInView);
  
 
                //push to matrix where the grip figure points are reference(see GripBox and circlepts)
                render.PushToViewMatrix();
                render.PushMatrix(morigin);
  
                if (i == 0)//if it is the first grip
                {
                    render.PushPenstyle(Color.Red, true);
                    render.DrawPLine(sender, circlepts);
                    render.PopPenstyle();
                }
                else render.DrawBoundBox(sender, GripBox);
  
                render.PopMatrix();
                render.PopMatrix();
  
 
                //if a rendering procedure was break usually by a user pan / zoom in-out
                if (render.StatusDraw == vdRender.DrawStatus.Break) break;
                i++;
            }
            render.IsMessageQueEmpty();//update the render StatusDraw by checking if a mouse action was placed by the user
            cancel = true;//do not call the default VectorDraw grip draw.
        }

五. VDF滚动的鼠标滚轮控制
问：我想禁用鼠标平移和鼠标滚轮缩放，而不是使用滚轮，我想控制绘图的滚动，水平和垂直。我如何才能做到这一点？

答：您可以按照以下操作来禁用鼠标中键平移和鼠标滚轮放大/缩小:

//For the wrapper we have to get the vdDocument object like below.
VectorDraw.Professional.vdObjects.vdDocument doc = vd.ActiveDocument.WrapperObject as VectorDraw.Professional.vdObjects.vdDocument;
 
doc.MouseWheelZoomScale = 1.0;              //1.0 means disabled mouse wheel. 0.8(less than 1.0) or 1.2(more than 1.0) values can reverse the mouse wheel functionality.

要禁用平移，您必须使用如下的JobStart事件。

vd.JobStart += new AxVDrawLib5._DVdrawEvents_JobStartEventHandler(vd_JobStart);
 
void vd_JobStart(object sender, AxVDrawLib5._DVdrawEvents_JobStartEvent e)
{if (e.jobName == "BaseAction_ActionPan") e.cancel = 1;}

要滚动视图，请使用以下代码：

... // these events must be used
           doc.MouseWheelZoomScale = 1.0d; // disable mouse wheel zoom
            
           doc.ActionStart += new vdDocument.ActionStartEventHandler(doc_ActionStart);
           vdFramedControl1.BaseControl.MouseWheel += new MouseEventHandler(BaseControl_MouseWheel);
       ...
 
       void BaseControl_MouseWheel(object sender, MouseEventArgs e)
       {
           if ((e != null) && (e.Delta != 0))
           {
               vdDocument doc = vdFramedControl1.BaseControl.ActiveDocument;
               double height = doc.ActiveRender.Height * doc.ActiveRender.PixelSize;
               double width = doc.ActiveRender.Width * doc.ActiveRender.PixelSize;
               double stepY = height * (e.Delta / Math.Abs(e.Delta)) / 10.0d;
               double stepX = width * (-1.0d * e.Delta / Math.Abs(e.Delta)) / 10.0d;
               if ((Control.ModifierKeys & Keys.Shift) == Keys.Shift)
               { // if Shift key is pressed scroll horizontally
                   doc.ScrollActiveActionRenderView(stepX, 0.0d, true); // scroll only in dX
               }
               else //else scroll vertically
               {
                   doc.ScrollActiveActionRenderView(0.0d, stepY, true); // scroll only in dY
               }
           }
       }
 
       void doc_ActionStart(object sender, string actionName, ref bool cancel)
       {
           if (actionName == "BaseAction_ActionPan") cancel = true; // cancel middle mouse button pan
       }