業(yè)務(wù)流程圖控件FlowChart.NET是一個(gè)通用的流程圖控件，提供了用于創(chuàng)建或編輯圖表的直觀的用戶交互模型。在上一篇文章創(chuàng)建自定義節(jié)點(diǎn)類型（一）中已經(jīng)講解了三個(gè)步驟，本教程將繼續(xù)展示在FlowChart.NET如何創(chuàng)建自定義節(jié)點(diǎn)類型的步驟。

4、覆蓋DrawLocal方法

通過覆蓋基礎(chǔ)類的DrawLocal方法來實(shí)現(xiàn)繪制自己的邏輯。

C# 

public override void DrawLocal(IGraphics graphics, RenderOptions options)
{
    Rectangle iconSizePixels = new Rectangle(
        0, 0, icon.Width, icon.Height);
    RectangleF imageSize = MindFusion.Utilities.DeviceToDoc(
        graphics, iconSizePixels);

    // Draw the icon at the top-middle
    graphics.DrawImage(icon,
        Bounds.X + Bounds.Width / 2 - imageSize.Width / 2, Bounds.Y);

    // Draw the label at the bottom
    RectangleF labelBounds = RectangleF.FromLTRB(
        Bounds.X, Bounds.Y + imageSize.Height,
        Bounds.Right, Bounds.Bottom);

    graphics.DrawString(label,
        Font, Brushes.Black, labelBounds, format);
}

Visual Basic

Public Overrides Sub DrawLocal(ByVal graphics As IGraphics, ByVal options As RenderOptions)

    Dim iconSizePixels As Rectangle = New Rectangle( _
        0, 0, fIcon.Width, fIcon.Height)
    Dim imageSize As RectangleF = MindFusion.Utilities.DeviceToDoc( _
        graphics, iconSizePixels)

    ' Draw the icon at the top-middle
    graphics.DrawImage(fIcon, _
        Bounds.X + Bounds.Width / 2 - imageSize.Width / 2, Bounds.Y)

    ' Draw the label at the bottom
    Dim labelBounds As RectangleF = RectangleF.FromLTRB( _
        Bounds.X, Bounds.Y + imageSize.Height, _
        Bounds.Right, Bounds.Bottom)

    graphics.DrawString(fLabel, _
        Font, Brushes.Black, labelBounds, format)

End Sub

5、覆蓋DrawShadowLocal方法

通過覆蓋基礎(chǔ)類的DrawShadowLoca方法來實(shí)現(xiàn)陰影的自定義繪制。

C#

public override void DrawShadowLocal(IGraphics graphics, RenderOptions options)
{
}

Visual Basic

Public Overrides Sub DrawShadowLocal(ByVal graphics As IGraphics, ByVal options as RenderOptions)

End Sub