ActivityDesignerPaint.DrawImage 方法

参考

定义

命名空间:: System.Workflow.ComponentModel.Design

程序集:: System.Workflow.ComponentModel.dll

重要

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在活动设计器图面上绘制图像。

重载

DrawImage(Graphics, Image, Rectangle, DesignerContentAlignment)	使用 Graphics、Image、Rectangle 和 DesignerContentAlignment 在活动设计器图面上绘制图像。
DrawImage(Graphics, Image, Rectangle, Rectangle, DesignerContentAlignment, Single, Boolean)	使用 Graphics、Image、源和目标 Rectangle、DesignerContentAlignment、单精度浮点型数字和布尔值在活动设计器图面上绘制图像。

DrawImage(Graphics, Image, Rectangle, DesignerContentAlignment)

使用 Graphics、Image、Rectangle 和 DesignerContentAlignment 在活动设计器图面上绘制图像。

public:
 static void DrawImage(System::Drawing::Graphics ^ graphics, System::Drawing::Image ^ image, System::Drawing::Rectangle destination, System::Workflow::ComponentModel::Design::DesignerContentAlignment alignment);

public static void DrawImage (System.Drawing.Graphics graphics, System.Drawing.Image image, System.Drawing.Rectangle destination, System.Workflow.ComponentModel.Design.DesignerContentAlignment alignment);

static member DrawImage : System.Drawing.Graphics * System.Drawing.Image * System.Drawing.Rectangle * System.Workflow.ComponentModel.Design.DesignerContentAlignment -> unit

Public Shared Sub DrawImage (graphics As Graphics, image As Image, destination As Rectangle, alignment As DesignerContentAlignment)

参数

graphics: Graphics

要在其上绘制图像的 Graphics。

image: Image

要绘制的 Image。

destination: Rectangle

定义要绘制的图像边界的 Rectangle。

alignment: DesignerContentAlignment

指定图像在边框中的对齐方式的 DesignerContentAlignment。

例外

ArgumentNullException

graphics、image 或 destination 包含空引用（在 Visual Basic 中为 Nothing）。

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。首先使用 DrawRoundedRectangle 方法绘制一个圆角矩形。然后使用 DrawText 绘制文本并将其放在 TextRectangle 的 ActivityDesigner 位置。此外，再使用 Image 类的 ActivityDesigner 方法绘制与 DrawImage 关联的 ActivityDesignerPaint。最后，使用 CompositeActivity 绘制由 DrawExpandButton 使用的展开按钮。

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

在使用此版本的 DrawImage 时，源矩形设置为图像的大小（用像素表示），透明度设置设为 1.0f 且不允许使用绘图灰度。

适用于

DrawImage(Graphics, Image, Rectangle, Rectangle, DesignerContentAlignment, Single, Boolean)

使用 Graphics、Image、源和目标 Rectangle、DesignerContentAlignment、单精度浮点型数字和布尔值在活动设计器图面上绘制图像。

public:
 static void DrawImage(System::Drawing::Graphics ^ graphics, System::Drawing::Image ^ image, System::Drawing::Rectangle destination, System::Drawing::Rectangle source, System::Workflow::ComponentModel::Design::DesignerContentAlignment alignment, float transparency, bool grayscale);

public static void DrawImage (System.Drawing.Graphics graphics, System.Drawing.Image image, System.Drawing.Rectangle destination, System.Drawing.Rectangle source, System.Workflow.ComponentModel.Design.DesignerContentAlignment alignment, float transparency, bool grayscale);

static member DrawImage : System.Drawing.Graphics * System.Drawing.Image * System.Drawing.Rectangle * System.Drawing.Rectangle * System.Workflow.ComponentModel.Design.DesignerContentAlignment * single * bool -> unit

Public Shared Sub DrawImage (graphics As Graphics, image As Image, destination As Rectangle, source As Rectangle, alignment As DesignerContentAlignment, transparency As Single, grayscale As Boolean)

参数

graphics: Graphics

要在其上绘制图像的 Graphics。

image: Image

要绘制的 Image。

destination: Rectangle

定义图像边界的 Rectangle。

source: Rectangle

定义图像源的 Rectangle。

alignment: DesignerContentAlignment

指定图像在边框中的对齐方式的 DesignerContentAlignment。

transparency: Single

定义图像的透明度设置的单精度浮点型数字。

grayscale: Boolean

为 true 则绘制灰度图像；否则为 false。

例外

ArgumentNullException

graphics、image、destination 或 source 包含空引用（在 Visual Basic 中为 Nothing）。

或 - transparency 小于 0 或大于 1.0f。

适用于

通过

ActivityDesignerPaint.DrawImage 方法

定义

重载

DrawImage(Graphics, Image, Rectangle, DesignerContentAlignment)

参数

例外

示例

注解

适用于

DrawImage(Graphics, Image, Rectangle, Rectangle, DesignerContentAlignment, Single, Boolean)

参数

例外

适用于

其他资源