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StylusPoint Structure

Silverlight

Other Versions

Represents a single point collected while the user is entering ink strokes with the stylus or mouse.

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

Syntax

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public struct StylusPoint

XAML Object Element Usage

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<StylusPoint .../>

The StylusPoint type exposes the following members.

Constructors

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

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Properties

	Name	Description
	PressureFactor	Gets or sets the pressure factor of the stylus on the screen.
	X	Gets or sets the value for the x-coordinate of the StylusPoint.
	Y	Gets or sets the value for the y-coordinate of the StylusPoint.

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Methods

	Name	Description
	Equals	Indicates whether this instance and a specified object are equal. (Inherited from ValueType.)
	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.)
	GetHashCode	Returns the hash code for this instance. (Inherited from ValueType.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns the fully qualified type name of this instance. (Inherited from ValueType.)

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Remarks

The StylusPoint structure represents a single point. All StylusPoint objects contain properties that indicate the (x, y) coordinates and the pressure.

Note:
You can get the relevant PressureFactor only if the device supports it. Otherwise, PressureFactor will have a default value of 0.5.

Multiple StylusPoint objects typically make up a Stroke object. The Stroke object stores the stylus points in the StylusPoints property.

Examples

The following code example displays the x-coordinate, y-coordinate, and pressure data of each stylus point as they are added to a stroke.

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public Page()
{
    InitializeComponent();
    SetBoundary();
}

Stroke MyStroke;

//A new stroke object, MyStroke, is created and is added to the StrokeCollection object
//of the InkPresenter, 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);

    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));
        XTB.Text = "" + e.StylusDevice.GetStylusPoints(MyIP)[0].X;
        YTB.Text = "" + e.StylusDevice.GetStylusPoints(MyIP)[0].Y;
        PressureTB.Text = "" + e.StylusDevice.GetStylusPoints(MyIP)[0].PressureFactor;
    }
}

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

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