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
- rectangle
- Rectangle
定义圆角矩形边界的 Rectangle。The 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
graphics 或 drawingPen 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 TextRectangle 的 ActivityDesigner 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 ActivityDesignerPaint。Additionally, 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.