ActivityDesignerPaint.DrawRoundedRectangle(Graphics, Pen, Rectangle, Int32) 方法

定义

在活动设计器图面上绘制圆角矩形。Draws a rounded rectangle on the activity designer surface.

public:
 static void DrawRoundedRectangle(System::Drawing::Graphics ^ graphics, System::Drawing::Pen ^ drawingPen, System::Drawing::Rectangle rectangle, int radius);
public static void DrawRoundedRectangle (System.Drawing.Graphics graphics, System.Drawing.Pen drawingPen, System.Drawing.Rectangle rectangle, int radius);
static member DrawRoundedRectangle : System.Drawing.Graphics * System.Drawing.Pen * System.Drawing.Rectangle * int -> unit
Public Shared Sub DrawRoundedRectangle (graphics As Graphics, drawingPen As Pen, rectangle As Rectangle, radius As Integer)

参数

graphics
Graphics

要在其上绘制矩形的 GraphicsThe Graphics on which to draw the rectangle.

drawingPen
Pen

用于绘制矩形的 PenThe Pen to draw the rectangle.

rectangle
Rectangle

定义圆角矩形边界的 RectangleThe Rectangle that defines the bounds of the rounded rectangle.

radius
Int32

要用于圆角边缘的半径的整数值。The integer value of the radius to use for the rounded edges.

例外

graphicsdrawingPen 包含空引用(在 Visual Basic 中为 Nothing)。graphics or drawingPen contains a null reference (Nothing in Visual Basic).

示例

下面的示例演示一种使用 ActivityDesignerPaint 类在工作流设计图面上绘制自定义活动的方式。The following example demonstrates a way to use the ActivityDesignerPaint class to draw a custom activity on the workflow design surface. 首先使用 DrawRoundedRectangle 方法绘制一个圆角矩形。A rounded rectangle is first drawn using the DrawRoundedRectangle method. 然后使用 DrawText 绘制文本并将其放在 TextRectangleActivityDesigner 位置。Text is then drawn using DrawText and is placed at the location of the TextRectangle of the ActivityDesigner. 此外,再使用 Image 类的 ActivityDesigner 方法绘制与 DrawImage 关联的 ActivityDesignerPaintAdditionally, the Image associated with the ActivityDesigner is drawn using the DrawImage method of the ActivityDesignerPaint class. 最后,使用 CompositeActivity 绘制由 DrawExpandButton 使用的展开按钮。Finally, an expand button used by a CompositeActivity is drawn using the DrawExpandButton.

private bool expanded = true;
private bool useBasePaint = false;

public bool UseBasePaint
{
    get { return this.useBasePaint; }
    set { this.useBasePaint = value; }
}

public bool Expanded
{
    get { return this.expanded; }
    set { this.expanded = value; }
}

protected override void OnPaint(ActivityDesignerPaintEventArgs e)
{
    if (this.UseBasePaint == true)
    {
        base.OnPaint(e);
        return;
    }

    DrawCustomActivity(e);
}

private void DrawCustomActivity(ActivityDesignerPaintEventArgs e)
{
    Graphics graphics = e.Graphics;

    CompositeDesignerTheme compositeDesignerTheme = (CompositeDesignerTheme)e.DesignerTheme;

    ActivityDesignerPaint.DrawRoundedRectangle(graphics, compositeDesignerTheme.BorderPen, this.Bounds, compositeDesignerTheme.BorderWidth);

    string text = this.Text;
    Rectangle textRectangle = this.TextRectangle;
    if (!String.IsNullOrEmpty(text) && !textRectangle.IsEmpty)
    {
        ActivityDesignerPaint.DrawText(graphics, compositeDesignerTheme.Font, text, textRectangle, StringAlignment.Center, e.AmbientTheme.TextQuality, compositeDesignerTheme.ForegroundBrush);
    }

    System.Drawing.Image image = this.Image;
    Rectangle imageRectangle = this.ImageRectangle;
    if (image != null && !imageRectangle.IsEmpty)
    {
        ActivityDesignerPaint.DrawImage(graphics, image, imageRectangle, DesignerContentAlignment.Fill);
    }

    ActivityDesignerPaint.DrawExpandButton(graphics,
        new Rectangle(this.Location.X, this.Location.Y, 10, 10),
        this.Expanded,
        compositeDesignerTheme);
}
Private expandedValue As Boolean = True
Private useBasePaintValue As Boolean = False

Public Property UseBasePaint() As Boolean
    Get
        Return Me.useBasePaintValue
    End Get

    Set(ByVal value As Boolean)
        Me.useBasePaintValue = value
    End Set
End Property

Public Property Expanded() As Boolean
    Get
        Return Me.expandedValue
    End Get
    Set(ByVal value As Boolean)
        Me.expandedValue = value
    End Set
End Property


Protected Overrides Sub OnPaint(ByVal e As ActivityDesignerPaintEventArgs)
    If Me.UseBasePaint = True Then
        MyBase.OnPaint(e)
        Return
    End If

    DrawCustomActivity(e)
End Sub

Private Sub DrawCustomActivity(ByVal e As ActivityDesignerPaintEventArgs)
    Dim graphics As Graphics = e.Graphics

    Dim compositeDesignerTheme As CompositeDesignerTheme = CType(e.DesignerTheme, CompositeDesignerTheme)

    ActivityDesignerPaint.DrawRoundedRectangle(graphics, compositeDesignerTheme.BorderPen, Me.Bounds, compositeDesignerTheme.BorderWidth)

    Dim text As String = Me.Text
    Dim TextRectangle As Rectangle = Me.TextRectangle
    If Not String.IsNullOrEmpty(text) And Not TextRectangle.IsEmpty Then
        ActivityDesignerPaint.DrawText(graphics, compositeDesignerTheme.Font, text, TextRectangle, StringAlignment.Center, e.AmbientTheme.TextQuality, compositeDesignerTheme.ForegroundBrush)
    End If

    Dim Image As System.Drawing.Image = Me.Image
    Dim ImageRectangle As Rectangle = Me.ImageRectangle
    If Image IsNot Nothing And Not ImageRectangle.IsEmpty Then
        ActivityDesignerPaint.DrawImage(graphics, Image, ImageRectangle, DesignerContentAlignment.Fill)
    End If

    ActivityDesignerPaint.DrawExpandButton(graphics, _
        New Rectangle(Me.Location.X, Me.Location.Y, 10, 10), _
        Me.Expanded, _
        compositeDesignerTheme)
End Sub

注解

DrawRoundedRectangle 使用 GetRoundedRectanglePath 方法获取要绘制的路径。DrawRoundedRectangle uses the GetRoundedRectanglePath method to obtain the path to draw.

适用于