Articolo
11/18/2011

DrawingAttributes Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Specifies drawing attributes that are used to draw a Stroke.

Inheritance Hierarchy

System.Object
System.Windows.DependencyObject
System.Windows.Ink.DrawingAttributes

Namespace: System.Windows.Ink
Assembly: System.Windows (in System.Windows.dll)

Syntax

'Declaration
Public NotInheritable Class DrawingAttributes _
    Inherits DependencyObject

public sealed class DrawingAttributes : DependencyObject

<DrawingAttributes .../>

The DrawingAttributes type exposes the following members.

Constructors

	Name	Description
	DrawingAttributes	Initializes a new instance of the DrawingAttributes class.

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Properties

	Name	Description
	Color	Gets or sets the color that is used to draw a Stroke.
	Dispatcher	Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
	Height	Gets or sets the height of the stylus that is used to draw a Stroke.
	OutlineColor	Gets or sets the outline color that is used to draw a Stroke.
	Width	Gets or sets the width of the stylus that is used to draw a Stroke.

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Methods

	Name	Description
	CheckAccess	Determines whether the calling thread has access to this object. (Inherited from DependencyObject.)
	ClearValue	Clears the local value of a dependency property. (Inherited from DependencyObject.)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetAnimationBaseValue	Returns any base value established for a Silverlight dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetValue	Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ReadLocalValue	Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
	SetValue	Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

The DrawingAttributes class allows you to specify drawing attributes, such as height, width, color, and outline color. To apply the drawing attributes to a stroke, you set the Stroke.DrawingAttributes property on a Stroke to a DrawingAttributes object.

For a list of default property values for an instance of the DrawingAttributes class, see the DrawingAttributes constructor.

Examples

The following code example simulates three different stylus types (pen, marker, and highlighter) by setting the Height, Width, Color, and OutlineColor properties of a DrawingAttributes object. The example creates a DrawingAttributes object and then applies it to a Stroke object. When the user clicks a stylus type button, the example updates the DrawingAttributes properties. The BtEraser_Click method clears all the strokes from the InkPresenter control.

Run this sample

'A new stroke object, MyStroke, is created and is added to the StrokeCollection object
'of the InkPresenter, MyIP
Private Sub MyIP_MouseLeftButtonDown(ByVal sender As Object, ByVal e As MouseEventArgs)
    MyIP.CaptureMouse()
    Dim MyStylusPointCollection As StylusPointCollection = New StylusPointCollection
    MyStylusPointCollection.Add(e.StylusDevice.GetStylusPoints(MyIP))
    MyStroke = New Stroke(MyStylusPointCollection)
    MyStroke.DrawingAttributes = CloneDrawingAttributes(MyDA)
    MyIP.Strokes.Add(MyStroke)
End Sub

'StylusPoint objects are collected from the MouseEventArgs and added to MyStroke
Private Sub MyIP_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs)
    If (Not (MyStroke) Is Nothing) Then
        MyStroke.StylusPoints.Add(e.StylusDevice.GetStylusPoints(MyIP))
    End If
End Sub

'MyStroke is completed
Private Sub MyIP_LostMouseCapture(ByVal sender As Object, ByVal e As MouseEventArgs)
    MyStroke = Nothing
End Sub

Private Function CloneDrawingAttributes(ByVal attributes As DrawingAttributes) As DrawingAttributes
    If (attributes Is Nothing) Then
        Return attributes
    End If
    Dim cloneAttribute As DrawingAttributes = New DrawingAttributes
    cloneAttribute.Color = attributes.Color
    cloneAttribute.Height = attributes.Height
    cloneAttribute.OutlineColor = attributes.OutlineColor
    cloneAttribute.Width = attributes.Width
    Return cloneAttribute
End Function

'Set drawing attributes to simulate a pen
Private Sub BtPen_Click(ByVal sender As Object, ByVal e As EventArgs)
    MyDA.Width = 1
    MyDA.Height = (Double.Epsilon - 1)
    MyDA.Color = Colors.Black
    MyDA.OutlineColor = Colors.Black
End Sub

'Set drawing attributes to simulate a marker
Private Sub BtMarker_Click(ByVal sender As Object, ByVal e As EventArgs)
    MyDA.Width = 10
    MyDA.Height = 4
    MyDA.Color = Colors.Blue
    MyDA.OutlineColor = Colors.Blue
End Sub

'Set drawing attributes to simulate a highlighter
Private Sub BtHighlighter_Click(ByVal sender As Object, ByVal e As EventArgs)
    MyDA.Width = 25
    MyDA.Height = 5
    MyDA.Color = Colors.Yellow
    MyDA.OutlineColor = Colors.Yellow
End Sub

'Clear the strokes from the inkpresenter control
Private Sub BtEraser_Click(ByVal sender As Object, ByVal e As EventArgs)
    MyIP.Strokes.Clear()
End Sub


//A new stroke object named MyStroke is created. MyStroke is added to the StrokeCollection of the InkPresenter named MyIP
private void MyIP_MouseLeftButtonDown(object sender, MouseEventArgs e)
{
    MyIP.CaptureMouse();
    StylusPointCollection MyStylusPointCollection = new StylusPointCollection();
    MyStylusPointCollection.Add(e.StylusDevice.GetStylusPoints(MyIP));
    MyStroke = new Stroke(MyStylusPointCollection);
    MyStroke.DrawingAttributes = CloneDrawingAttributes(MyDA);
    MyIP.Strokes.Add(MyStroke);
}

//StylusPoint objects are collected from the MouseEventArgs and added to MyStroke
private void MyIP_MouseMove(object sender, MouseEventArgs e)
{
    if (MyStroke != null)
        MyStroke.StylusPoints.Add(e.StylusDevice.GetStylusPoints(MyIP));
}

//MyStroke is completed
private void MyIP_LostMouseCapture(object sender, MouseEventArgs e)
{
    MyStroke = null;
}

private DrawingAttributes CloneDrawingAttributes(DrawingAttributes attributes)
{
    if (attributes == null)
        return attributes;

    DrawingAttributes cloneAttribute = new DrawingAttributes();
    cloneAttribute.Color = attributes.Color;
    cloneAttribute.Height = attributes.Height;
    cloneAttribute.OutlineColor = attributes.OutlineColor;
    cloneAttribute.Width = attributes.Width;
    return cloneAttribute;
}

//Set drawing attributes to simulate a pen
private void BtPen_Click(object sender, EventArgs e)
{
    MyDA.Width = 1;
    MyDA.Height = Double.Epsilon - 1;
    MyDA.Color = Colors.Black;
    MyDA.OutlineColor = Colors.Black;
}

//Set drawing attributes to simulate a marker
private void BtMarker_Click(object sender, EventArgs e)
{
    MyDA.Width = 10;
    MyDA.Height = 4;
    MyDA.Color = Colors.Blue;
    MyDA.OutlineColor = Colors.Blue;
}

//Set drawing attributes to simulate a highlighter
private void BtHighlighter_Click(object sender, EventArgs e)
{
    MyDA.Width = 25;
    MyDA.Height = 5;
    MyDA.Color = Colors.Yellow;
    MyDA.OutlineColor = Colors.Yellow;
}

//Clear the strokes from the inkpresenter control
private void BtEraser_Click(object sender, EventArgs e)
{
    MyIP.Strokes.Clear();
}

private void SetBoundary()
{
    RectangleGeometry MyRectangleGeometry = new RectangleGeometry();
    MyRectangleGeometry.Rect = new Rect(0, 0, MyIP.ActualHeight, MyIP.ActualWidth);
    MyIP.Clip = MyRectangleGeometry;
}

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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