新手入门必看：VectorDraw 常见问题整理大全（十三）

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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. 在用户激活视口时更改视口的颜色

问：当用户通过双击激活视口时，如何更改视口的颜色？

答：在“Collections”示例中添加ActionLayoutActivated事件并编写类似的代码：

VectorDraw.Professional.vdObjects.vdColor oldcolor = new VectorDraw.Professional.vdObjects.vdColor(); // there will store the color before the "highlight"
VectorDraw.Professional.vdObjects.vdHandle deactivated_Viewport_handle = new VectorDraw.Professional.vdObjects.vdHandle(); // The handle of the Viewport we changed
void ActiveDocument_ActionLayoutActivated(object sender, VectorDraw.Professional.vdPrimaries.vdLayout deactivated, VectorDraw.Professional.vdPrimaries.vdLayout activated)
{// fires when the Layout or the Viewport changes
if (activated.ActiveViewPort == null) // Run when MODEL is activated that happens when the viewport is activated or user returns to Model.
{
    if (deactivated.ActiveViewPort != null) // the deactiveted vieport is the one that the use dbl-clicked
    {
        oldcolor.CopyFrom(deactivated.ActiveViewPort.PenColor); // store the color
        deactivated.ActiveViewPort.PenColor.SystemColor = Color.Red; // change the color
        deactivated.ActiveViewPort.Update();
        deactivated.ActiveViewPort.Invalidate();
        deactivated_Viewport_handle = deactivated.ActiveViewPort.Handle; // store the handle
    }
    if ((deactivated.ActiveViewPort == null) && (deactivated_Viewport_handle.Value != 0)) // This happens when the Viewport is not "active"
    {//create a vdViewport and set it to the viewport that was deactivated
        VectorDraw.Professional.vdFigures.vdViewport deactiViewport = new VectorDraw.Professional.vdFigures.vdViewport();
        deactiViewport= vdFramedControl1.BaseControl.ActiveDocument.FindFromHandle(deactivated_Viewport_handle, typeof(VectorDraw.Professional.vdPrimaries.vdFigure)) as VectorDraw.Professional.vdFigures.vdViewport;
        deactiViewport.PenColor.CopyFrom(oldcolor); // change the color back
        if (deactiViewport.ClipObj != null)
        {
            deactiViewport.ClipObj.PenColor.CopyFrom(oldcolor); // to the ClipObj too
            deactiViewport.ClipObj.Update();
            deactiViewport.ClipObj.Invalidate();
        }
        deactiViewport.Update();
        deactiViewport.Invalidate();
        deactivated_Viewport_handle= new VectorDraw.Professional.vdObjects.vdHandle(0); // set the handle to 0
    }
}
}

二. 在包装器中使用AlignToView和AlignToViewSize

问：如何在包装器中使用AlignToView和AlignToViewSize？

答：本文适用于6014及以上版本。使用VectorDraw.Professional.tlb，在VB6项目上只需添加一个vdraw包装器和2个按钮以及如下代码：

Private Sub Command6_Click()
Dim txt As VDrawI5.vdText
Dim AlignObject As VectorDraw_Professional.IAlignToView
 
    Set txt = VD.ActiveDocument.entities.AddText("aaBB", Array(10, 10), 1)
    VD.CommandAction.CmdRect Array(9.5, 9.5), Array(14, 11.5)
    VD.CommandAction.Zoom "E", 0, 0
    
    Set AlignObject = txt.WrapperObject ' set this text to be always parallel to the view.
    AlignObject.AlignToView = True
    AlignObject.AlignToViewSize = 20 'text size always the same, size in pixels
End Sub
 
Private Sub Command7_Click()
    VD.CommandAction.View3D "VROT"
End Sub

三. 在移动鼠标的同时在光标周围画一个圆圈

问：我想在移动鼠标时围绕光标画一个圆圈。我没有任何主动操作，我尝试使用MouseMove事件，但结果不正确。我该怎么做呢 ？

答：你应该使用在没有任何活动操作的情况下触发的OnActionDraw事件。试试如下代码：

void ActiveDocument_OnActionDraw(object sender, object action, bool isHideMode, ref bool cancel)
{
    VectorDraw.Actions.BaseAction act = action as VectorDraw.Actions.BaseAction;
    VectorDraw.Geometry.gPoint currentpoint = act.OrthoPoint;
    VectorDraw.Professional.vdFigures.vdCircle circle = new VectorDraw.Professional.vdFigures.vdCircle();
    circle.SetUnRegisterDocument(vdSC.BaseControl.ActiveDocument);
    circle.setDocumentDefaults();
    circle.Center = currentpoint;
    circle.Radius =2.0;
    circle.Draw(act.Render);
}

四. 像cmdCircle那样创建自己的命令

问：我想像cmdCircle那样创建自己的命令，但没有cmdCircle显示的rubber radious。我该怎么做 ？

答：你需要创建自己的cmd-circle而不是使用我们的cmdCircle。例如，在表单中的空C＃项目中添加一个vdScrollable控件（名为vdSC）和一个按钮并使用如下代码：

      bool onMycmdCircle = false;
        VectorDraw.Geometry.gPoint cent = new VectorDraw.Geometry.gPoint();
 
        private void Form1_Load(object sender, EventArgs e)
        {
            this.vdSC.BaseControl.ActiveDocument.ShowUCSAxis = false;
            this.vdSC.BaseControl.ActiveDocument.FreezeEntityDrawEvents.Push(false);
            this.vdSC.BaseControl.ActiveDocument.OnActionDraw += new VectorDraw.Professional.vdObjects.vdDocument.ActionDrawEventHandler(ActiveDocument_OnActionDraw);
        }
 
        void ActiveDocument_OnActionDraw(object sender, object action, bool isHideMode, ref bool cancel)
        { //here we draw the rubber circle
 
            if (action is VectorDraw.Actions.ActionGetPoint && onMycmdCircle)
            {
                VectorDraw.Actions.BaseAction act = action as VectorDraw.Actions.BaseAction;
                VectorDraw.Geometry.gPoint refpoint = act.ReferencePoint;
                VectorDraw.Geometry.gPoint currentpoint = act.OrthoPoint;
                VectorDraw.Professional.vdFigures.vdCircle circle = new VectorDraw.Professional.vdFigures.vdCircle();
                circle.SetUnRegisterDocument(vdSC.BaseControl.ActiveDocument);
                circle.setDocumentDefaults();
                circle.Center = cent;
                circle.Radius = circle.Center.Distance3D(currentpoint);
                circle.Draw(act.Render);
            }
            else
            {
                return;
            }
            return;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            VectorDraw.Geometry.gPoint pt_cent = new VectorDraw.Geometry.gPoint();
            VectorDraw.Geometry.gPoint pt_ref = new VectorDraw.Geometry.gPoint();
            object status_cen = vdSC.BaseControl.ActiveDocument.ActionUtility.getUserPoint(out pt_cent);
            vdSC.BaseControl.ActiveDocument.ActiveLayOut.User2WorldMatrix.TransformPt(pt_cent, cent);
            if (status_cen != null && (VectorDraw.Actions.StatusCode)status_cen == VectorDraw.Actions.StatusCode.Success)
            {
                onMycmdCircle = true;
                object status_ref = vdSC.BaseControl.ActiveDocument.ActionUtility.getUserPoint(out pt_ref);
                onMycmdCircle = false;
 

                if (status_ref != null && (VectorDraw.Actions.StatusCode)status_ref == VectorDraw.Actions.StatusCode.Success)
                {
                    //VectorDraw.Geometry.gPoint cent = new VectorDraw.Geometry.gPoint();
 
                    double radious = 0;
                    VectorDraw.Geometry.gPoint refp = new VectorDraw.Geometry.gPoint();
                    vdSC.BaseControl.ActiveDocument.ActiveLayOut.User2WorldMatrix.TransformPt(pt_ref, refp);
                    radious = refp.Distance3D(cent);
                    vdSC.BaseControl.ActiveDocument.CommandAction.CmdCircle(cent, radious);
                }
            }
 
        }

未完待续~