新手入門必看：VectorDraw 常見問題整理大全（七）

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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. 從一個點選擇實體（提供四種方法）

問：如何從單個點選擇鎖定/未鎖定圖層中的實體？

答：在本文中，我們將使用四種方法從我們使用getUserPoint（）（這是pt）獲得的點中選擇可能處于鎖定或未鎖定層中的實體，如：

            gPoint pt = vdScrollableControl1.BaseControl.ActiveDocument.ActionUtility.getUserPoint() as gPoint;
and for the Selection Set :
            vdSelection selectionSet = null;
            selectionSet = vdScrollableControl1.BaseControl.ActiveDocument.Selections.FindName(name);
            if (selectionSet == null)
            {
                selectionSet = vdScrollableControl1.BaseControl.ActiveDocument.Selections.Add(name);
            }
            gPoint p1 = m_ActiveDoc.World2PixelMatrix.Transform(pt as gPoint);

方法1：使用RenderSelect.SelectingMode.SingleEntitiyPoint進行選擇

這將獲得最頂層的實體。如果此實體位于鎖定圖層中，則返回的selectionSet將為空

            // Selection with RenderSelect.SelectingMode.SingleEntitiyPoint
            gPoints points = new gPoints();
            selectSet.RemoveAll();
            points.Add(pt);
            selectSet.Select(RenderSelect.SelectingMode.SingleEntitiyPoint, points);

            if (selectSet.Count > 0)
            {
                foreach (vdFigure fig in selectSet)
                {
                    MessageBox.Show("Found figure with Handle " + fig.HandleId.ToString() + " in Layer: " + fig.Layer.Name + " which is locked: " + fig.Layer.Lock.ToString(), "[Select with SingleEntitiyPoint]");
                }
            }
            else
            {
                MessageBox.Show("No object selected","[Select with SingleEntitiyPoint]");
            }

方法2：使用GetEntityFromPoint選擇選擇

即使此實體位于鎖定層中，也將獲得最頂層實體。

            // Selection with GetEntityFromPoint
            Point location1 = new Point((int)p1.x, (int)p1.y);
            vdFigure fig2 = m_ActiveDoc.ActiveLayOut.GetEntityFromPoint(location1, m_ActiveDoc.ActiveLayOut.Render.GlobalProperties.PickSize, false);
            if (fig2 != null)
            {
                MessageBox.Show("Found figure with Handle: " + fig2.HandleId.ToString() + " in Layer: " + fig2.Layer.Name + " which is locked: " + fig2.Layer.Lock.ToString(),"[Select with GetEntityFromPoint]" );
            }
            else
            {
                MessageBox.Show("No object selected", "[Select with GetEntityFromPoint]");
            }

方法3：使用RenderSelect.SelectingMode.CrossingWindowRectangle和光標的PickSize進行選擇

這將獲得當前點+ picksize中的所有實體，但不會獲取鎖定圖層中的實體

            // Selection with RenderSelect.SelectingMode.CrossingWindowRectangle and the cursors PickSize
            selectSet.RemoveAll();
            gPoints points2 = new gPoints();
            int size = m_ActiveDoc.ActiveLayOut.Render.GlobalProperties.PickSize;
            Point location2 = new Point((int)p1.x-size/2, (int)p1.y-size/2);
            Point location3 = new Point((int)p1.x+size/2, (int)p1.y+size/2);
            points2.Add(m_ActiveDoc.ActiveLayOut.Render.Pixel2View(location2));
            points2.Add(m_ActiveDoc.ActiveLayOut.Render.Pixel2View(location3));
            
            selectSet.Select(RenderSelect.SelectingMode.CrossingWindowRectangle, points2);

            if (selectSet.Count > 0)
            {
                foreach (vdFigure fig in selectSet)
                {
                    MessageBox.Show("Found figure with Handle " + fig.HandleId.ToString() + " in Layer: " + fig.Layer.Name + " which is locked: " + fig.Layer.Lock.ToString(), "[Select with CrossingWindowRectangle & PickSize]");
                }
            }
            else
            {
                MessageBox.Show("No object selected", "[Select with CrossingWindowRectangle & PickSize]");
            }

方法4：使用Select3D和光標的PickSize選擇

這將獲得當前點中的所有實體+ picksize甚至鎖定圖層中的實體

注意：Select3d方法不適用于Handle屬性大于UInt的實體（32位）無符號整數）。

            // Selection using Select3D and cursor's picksize
            Point location4 = new Point((int)p1.x , (int)p1.y );
            vdEntities ents = m_ActiveDoc.Select3d(location4, m_ActiveDoc.ActiveLayOut.Render.GlobalProperties.PickSize);
            if (ents.Count > 0)
            {
                foreach (vdFigure fig in ents)
                {
                    MessageBox.Show("Found figure with Handle " + fig.HandleId.ToString() + " in Layer: " + fig.Layer.Name + " which is locked: " + fig.Layer.Lock.ToString(), "[Select with Select3d & PickSize]");
                }
            }
            else
            {
                MessageBox.Show("No object selected", "[Select with Select3d & PickSize]");
            }

二. 在打印期間，DrawAfter事件使用render.PrinterMode PRINT_PRINTER多次觸發

問：在C＃中使用vdProControl并在打印期間使用render.PrinterMode = PRINT_PRINTER多次觸發DrawAfter事件？

答：根據打印機及其分辨率，VDF將紙張分割成區域，以便可以在大型打印機中打印，這是因為圖紙可能包含大尺寸位圖，或者只能打印為位圖（如3D渲染模式）。VDF 6中的渲染在版本5中發生了很大變化，這就是您遇到問題的原因。代碼應該寫成不同的代碼：

如果你使用PRINT_PRINTER，那么你應該繪制你喜歡它們是繪圖單位中的實際對象的對象，例如：

if (render.PrinterMode == VDrawI5.VdConstPrintMode.PRINT_PRINTER)
{
    VDrawI5.vdPrint printer = vdProControl.ActiveDocument.Printer;
    double[] rect = printer.PrintWindow as double[];
    double[] bottomLeft = new double[] { rect[0],rect[1] };
    double[] topRight = new double[] { rect[2], rect[3] };
    render.Select_Pen(VDrawI5.VdConstPen.VdPenSolid, 1, 0);
    render.PushMatrix();
    render.SelectWorldMatrix();
    render.Drawline(bottomLeft[0], bottomLeft[1], 0, topRight[0], topRight[1], 0, 0);
    render.Drawline(topRight[0], bottomLeft[1], 0, bottomLeft[0], topRight[1], 0, 0);
    render.Drawcircle((bottomLeft[0] + topRight[0]) / 2, (bottomLeft[1] + topRight[1]) / 2, 0, (-bottomLeft[1] + topRight[1]) / 2);
    render.PopMatrix();
}

if {}內的代碼將運行4次（或者更多地取決于打印機/紙張/分辨率），并且只有部分線條/圓圈將在每個“區域”中呈現并繪制你喜歡的內容。

如果你使用PRINT_PRINTER_PAPER，那么你應該像你一樣使用代碼，這里的問題是你設置筆（顏色，類型，寬度），如：

if (render.PrinterMode == VDrawI5.VdConstPrintMode.PRINT_PRINTER_PAPER)
{
    Console.WriteLine(render.PrinterMode.ToString());
    render.Select_Pen(VDrawI5.VdConstPen.VdPenSolid, 1, 0);
    double[] bottomLeft = new double[3];
    double[] topRight = new double[3];
    int left = 0, top = 0, right = 0, bottom = 0;
    render.GetWindowExt(ref left, ref top, ref right, ref bottom);
    render.PixelToView(left, bottom, ref bottomLeft[0], ref bottomLeft[1]);
    render.PixelToView(right, top, ref topRight[0], ref topRight[1]);
    render.Drawline(bottomLeft[0], bottomLeft[1], 0, topRight[0], topRight[1], 0, 0);
    render.Drawline(topRight[0], bottomLeft[1], 0, bottomLeft[0], topRight[1], 0, 0);
    render.Drawcircle((bottomLeft[0] + topRight[0]) / 2, (bottomLeft[1] + topRight[1]) / 2, 0, (-bottomLeft[1] + topRight[1]) / 2);
}

這取決于你在打印輸出時要繪制的內容，你應該遵循哪種方法。

你也可以使用VDF .Net庫的Render和DrawAfter事件，如（在Form_Load中）：

VectorDraw.Professional.vdObjects.vdDocument doc = vdProControl.ActiveDocument.WrapperObject as VectorDraw.Professional.vdObjects.vdDocument;
doc.OnDrawAfter += new VectorDraw.Professional.vdObjects.vdDocument.DrawAfterEventHandler(doc_OnDrawAfter);
and use the
void doc_OnDrawAfter(object sender, VectorDraw.Render.vdRender render)
        {
            //Do your things here
        }

編寫代碼以在printout中繪制額外的東西。在這種情況下，你將不得不在C＃項目中添加額外的引用，如VectorDraw.Render，VectorDraw.Geometry，VectorDraw.Serialize和VectorDraw.Generics

未完待續......