新手入門必看：VectorDraw 常見問題整理大全（三）

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VectorDraw Developer Framework（VDF）是一個用于應用程序可視化的圖形引擎庫。有了VDF提供的功能，您可以輕松地創(chuàng)建、編輯、管理、輸出、輸入和打印2D和3D圖形文件。該庫還支持許多矢量和柵格輸入和輸出格式，包括本地PDF和SVG導出。

【VectorDraw Developer Framework最新版下載】

VectorDraw web library (javascript)是一個矢量圖形庫。VectorDraw web library (javascript)不僅能打開CAD圖紙，而且能顯示任何支持HTML5標準平臺上的通用矢量對象，如Windows，安卓，iOS和Linux。無需任何安裝，VectorDraw web library (javascript)就可以運行在任何支持canvas標簽和Javascript的主流瀏覽器（Chrome, Firefox, Safari, Opera, Dolphin, Boat等等）中。

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

一. 使用vdScrolableControl獲取實體并在vdPropertyGrid中顯示其屬性

問：如何使用vdScrolableControl獲取實體并在vdPropertyGrid中顯示其屬性？

答：可以試試像這樣的代碼：

private void Form1_Load(object sender, EventArgs e)
{ 
    AddLayoutEntities();
    vdSC.BaseControl.vdMouseClick += new VectorDraw.Professional.Control.MouseClickEventHandler(BaseControl_vdMouseClick); 
}

void BaseControl_vdMouseClick(MouseEventArgs e, ref bool cancel)
{
    VectorDraw.Professional.vdPrimaries.vdFigure fig;
    VectorDraw.Geometry.gPoint pt = vdSC.BaseControl.ActiveDocument.CursorPosCCS(e.Location);
    VectorDraw.Geometry.gPoint p1 = vdSC.BaseControl.ActiveDocument.World2PixelMatrix.Transform(pt as VectorDraw.Geometry.gPoint);
    Point location = new Point((int)p1.x, (int)p1.y);
    fig = vdSC.BaseControl.ActiveDocument.ActiveLayOut.GetEntityFromPoint(location, vdSC.BaseControl.ActiveDocument.ActiveLayOut.Render.GlobalProperties.PickSize, false);
    if (fig == null)
    {
        vdPGrid.SelectedObject = vdSC.BaseControl.ActiveDocument;
        this.Text = "NO Entity clicked";
    }
    else
    {
        vdPGrid.SelectedObject = fig;
        this.Text = "Entity clicked";
    }
}

二. 讀取附加到polyhatch對象的折線

問：如何讀取附加到polyhatch對象的折線？

答：您可以從hatch（孵化）中獲取vdCurves，如下所示。請注意，填充對象可能包含vdCircle，vdArc以及通常所有類型的vdCurves。孵化是vdPolyhatch對象。

foreach (VectorDraw.Professional.vdCollections.vdCurves var in hatch.PolyCurves)
{
    foreach (VectorDraw.Professional.vdFigures.vdCurve var1 in var)
    {
        VectorDraw.Professional.vdFigures.vdPolyline poly1 = var1 as VectorDraw.Professional.vdFigures.vdPolyline;
         if (poly1 != null) MessageBox.Show("Found Polyline");
    }
}

三. 重寫VectorDrawBaseControl的DrawBackground事件

問：如何重寫VectorDrawBaseControl的DrawBackground事件，以便將Image繪制到Background？

答：以下示例覆蓋VectorDrawBaseControl的DrawBackground和vdScroll事件，以便在rendermode is Wire2d時將圖像繪制為背景。

Bitmap m_Bitmap;



        private void Form1_Load(object sender, EventArgs e)
        {
            vdFramedControl.BaseControl.DrawBackground += new VectorDraw.Professional.Control.DrawBackgroundEventHandler(BaseControl_DrawBackground);
            vdFramedControl.BaseControl.vdScroll += new VectorDraw.Professional.Control.ScrollEventHandler(BaseControl_vdScroll);



//create a bitmap object at runtime
            m_Bitmap = new Bitmap(vdFramedControl.BaseControl.Size.Width, vdFramedControl.BaseControl.Size.Height);
            Graphics g = Graphics.FromImage(m_Bitmap);
            g.Clear(vdFramedControl.BaseControl.ActiveDocument.Palette.Background);
            g.DrawString("VDraw", SystemFonts.DefaultFont, Brushes.Red, new PointF(vdFramedControl.BaseControl.Size.Width / 2, vdFramedControl.BaseControl.Size.Height/2));
            g.Dispose();
       }



//override the vdScroll event in order the pan and scroll draw the background properly.



        void BaseControl_vdScroll(object sender, ref double cx, ref double cy, ref bool cancel)
        {
            vdRender render = sender as vdRender;
            render.ViewCenter += new gPoint(cx, cy);
            vdFramedControl.BaseControl.ActiveDocument.Redraw(false); 
        }



       void BaseControl_DrawBackground(object sender, VectorDraw.Render.vdRender render, ref bool cancel)
        {
            System.Diagnostics.Debug.WriteLine("DrawBackground");
            if (m_Bitmap == null) return;
            if (!render.IsWire2d) return;//the following code is working only when 3d render is not active
            render.UnLock();
            Graphics g = render.graphics;
            if (g == null) return;
            g.Clear(render.BkColor);
            g.DrawImage(m_Bitmap, new Point(0, 0));
            g.DrawLine(Pens.Red, new Point(0, 0), new Point(render.Width, render.Height));
            render.Lock();



            cancel = true;
        }