通过

IStylusAsyncPlugin.StylusDown 方法

  • 项目

通知实现插件手写笔已接触到数字化仪表面。

命名空间：  Microsoft.StylusInput
程序集：  Microsoft.Ink（在 Microsoft.Ink.dll 中）

语法

声明
Sub StylusDown ( _
    sender As RealTimeStylus, _
    data As StylusDownData _
)
用法
Dim instance As IStylusAsyncPlugin
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
)

参数

备注

可以通过调用包含在 data 参数中的 StylusDownData 对象的继承的 SetData 方法来修改数据包数据。

备注

如果 value 参数中数组的长度不等于继承的 PacketPropertyCount 属性的值，则 SetData 方法将引发 ArgumentException 异常。

示例

此 C# 示例改编自 RealTimeStylus Plug-in Sample，演示 StylusDown 方法的实现。此示例围绕手写笔接触数字化仪的点画一个紫色的圈。myGraphics 变量包含对 RealTimeStylus 所附加到的控件的 Graphics 对象的内部引用。

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);
    }
}

此 Microsoft Visual Basic .NET 示例改编自 RealTimeStylus Plug-in Sample，演示 StylusDown 方法的实现。此示例围绕手写笔接触数字化仪的点画一个紫色的圈。myGraphics 变量包含对 RealTimeStylus 所附加到的控件的 Graphics 对象的内部引用。

Public Sub StylusDown(ByVal sender As RealTimeStylus, ByVal data As StylusDownData) _
 Implements IStylusAsyncPlugin.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

平台

Windows Vista, Windows XP SP2, Windows Server 2003

.NET Framework 和 .NET Compact Framework 并不是对每个平台的所有版本都提供支持。有关支持的版本的列表，请参见.NET Framework 系统要求。

版本信息

.NET Framework

受以下版本支持：3.0

另请参见

参考

IStylusAsyncPlugin 接口

IStylusAsyncPlugin 成员

Microsoft.StylusInput 命名空间

StylusDownData