VDF常見問題整理（五十七）：如何多種突出顯示顏色

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。

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問：我可以有多種突出顯示顏色嗎？我想突出顯示選中的對象。我想為選擇集的第一個對象設置不同的突出顯示顏色。

答：這只能在OnDrawFigure事件中完成，在該事件中，您可以檢查所選對象是否在臨時選擇中，在這種情況下，請使用其他顏色繪制該對象，例如：

private void button1_Click(object sender, EventArgs e)
{
    vdDocument doc = vdFramed1.BaseControl.ActiveDocument;
    doc.FreezeEntityDrawEvents.Push(false); //Enable draw events
    doc.OnDrawFigure+=new vdDocument.FigureDrawEventHandler(doc_OnDrawFigure); //add the event andler
}
void doc_OnDrawFigure(object sender, VectorDraw.Render.vdRender render, ref bool cancel)
{
    if (sender == null) return;
    vdDocument doc = vdFramed1.BaseControl.ActiveDocument;
    vdSelection selected = doc.Selections.FindName("VDRAW_TEMPORARY_SELSET"); // get the selection that contains the items
    if (selected == null || selected.Count < 1) return; vdFigure fig = sender as vdFigure; if (fig==null) return; if (selected.FindItem(fig)) // if the fig is in this selection (is selected) { double pix_size = render.PixelSize; if (ReferenceEquals(fig, selected[0])) { // push a different color to the render if this object is the first selected render.PushPenstyle(Color.Red, 4*pix_size); } else { render.PushPenstyle(Color.Yellow, 1*pix_size); } doc.FreezeEntityDrawEvents.Push(true); // disable the event as fig.Draw() will make it fire again fig.Draw(render); // draw the object with the penstyle pushed before doc.FreezeEntityDrawEvents.Pop(); // pop the event..... ALL PUSH must be followed by POP render.PopPenstyle(); //pop the penstyle ..... ALL PUSH must be followed by POP cancel = true; // do not allow vdraw to draw this item it is already draw by fig.Draw() above } else cancel = false; }

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