IStylusSyncPlugin.StylusDown Method

Artículo
12/12/2007

Informs the implementing plug-in that the stylus has touched the tablet digitizer surface.

Namespace: Microsoft.StylusInput
Assembly: Microsoft.Ink (in microsoft.ink.dll)

Syntax

'Declaration
Sub StylusDown ( _
    sender As RealTimeStylus, _
    data As StylusDownData _
)
'Usage
Dim instance As IStylusSyncPlugin
Dim sender As RealTimeStylus
Dim data As StylusDownData

instance.StylusDown(sender, data)

void StylusDown (
    RealTimeStylus sender,
    StylusDownData data
)

void StylusDown (
    RealTimeStylus^ sender, 
    StylusDownData^ data
)

void StylusDown (
    RealTimeStylus sender, 
    StylusDownData data
)

function StylusDown (
    sender : RealTimeStylus, 
    data : StylusDownData
)

Not applicable.

Parameters

sender
The RealTimeStylus object that sent the notification.

data
Information about the Stylus object associated with the notification.

Remarks

You can modify the packet data by calling the inherited SetData method of the StylusDownData object contained in the data parameter.

Note

An ArgumentExceptionArgumentException exception is thrown by the SetData method if the length of the array in the value parameter is not equal to the value of the inherited PacketPropertyCount property.

Example

This C# example, adapted from the RealTimeStylus Plug-in Sample, shows an implementation of StylusDown. The example draws a purple circle around the point where the stylus touches the digitizer. The myGraphics variable holds an internal reference to a Graphics object for the control the RealTimeStylus is attached to.

public void StylusDown(RealTimeStylus sender, StylusDownData data) 
{
    for (int i = 0; i < data.Count; i += data.PacketPropertyCount)
    {
        // Packet data always has x followed by y followed by the rest
        Point point = new Point(data[i], data[i+1]);

        // Since the packet data is in Ink Space coordinates, we need to convert to Pixels...
        point.X = (int)Math.Round((float)point.X * (float)myGraphics.DpiX/2540.0F);
        point.Y = (int)Math.Round((float)point.Y * (float)myGraphics.DpiY/2540.0F);

        // Draw a circle corresponding to the packet
        myGraphics.DrawEllipse(Pens.Purple, point.X - 2, point.Y - 2, 4, 4);
    }
}

This Microsoft Visual Basic .NET example, adapted from the RealTimeStylus Plug-in Sample, shows an implementation of StylusDown. The example draws a purple circle around the point where the stylus touches the digitizer. The myGraphics variable holds an internal reference to a Graphics object for the control the RealTimeStylus is attached to.

Public Sub StylusDown(ByVal sender As RealTimeStylus, ByVal data As StylusDownData) _
 Implements IStylusSyncPlugin.StylusDown
    Dim i As Integer
    For i = 0 To data.Count - data.PacketPropertyCount Step data.PacketPropertyCount
        ' Packet data always has x followed by y followed by the rest
        Dim point As New Point(data(i), data((i + 1)))

        ' Since the packet data is in Ink Space coordinates, we need to convert to Pixels...
        point.X = Math.Round((System.Convert.ToSingle(point.X) * System.Convert.ToSingle(myGraphics.DpiX) / 2540.0F))
        point.Y = Math.Round((System.Convert.ToSingle(point.Y) * System.Convert.ToSingle(myGraphics.DpiY) / 2540.0F))

        ' Draw a circle corresponding to the packet
        myGraphics.DrawEllipse(Pens.Purple, point.X - 2, point.Y - 2, 4, 4)
    Next i
End Sub 'StylusDown

Platforms

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

Version Information

.NET Framework

Supported in: 3.0

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