IStylusAsyncPlugin.Packets 方法

项目
11/04/2008

通知实现 IStylusAsyncPlugin 接口的对象手写笔将移动到数字化仪上。

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

语法

声明
Sub Packets ( _
    sender As RealTimeStylus, _
    data As PacketsData _
)
用法
Dim instance As IStylusAsyncPlugin
Dim sender As RealTimeStylus
Dim data As PacketsData

instance.Packets(sender, data)

void Packets(
    RealTimeStylus sender,
    PacketsData data
)

void Packets(
    RealTimeStylus^ sender, 
    PacketsData^ data
)

void Packets(
    RealTimeStylus sender,
    PacketsData data
)

function Packets(
    sender : RealTimeStylus, 
    data : PacketsData
)

参数

sender
类型：Microsoft.StylusInput.RealTimeStylus
调用此方法的 RealTimeStylus 对象。

data
类型：Microsoft.StylusInput.PluginData.PacketsData
有关手写笔移动的信息。

备注

可以通过调用包含在 data 参数中的 PacketsData 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是继承的 PacketPropertyCount 属性值的倍数，则 SetData 方法将引发 ArgumentException 异常。

可以通过调用将 value 参数设置为 nullnull 引用（在 Visual Basic 中为 Nothing）（在 Microsoft Visual Basic .NET 中为 Nothing）的 SetData 方法来取消数据包。

示例

此 C# 示例摘自 RealTimeStylus Plug-in Sample。它实现 Packets 方法，该方法在收到的每个新数据包的位置画一个小圈。

public void Packets(RealTimeStylus sender,  PacketsData data)
{           
  // For each new packet received, extract the x,y data
  // and draw a small circle around the result.
  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.Green, point.X - 2, point.Y - 2, 4, 4);
  }
}

此 Visual Basic .NET 示例摘自 RealTimeStylus Plug-in Sample。它实现 Packets 方法，该方法在收到的每个新数据包的位置画一个小圈。

Public Sub Packets(ByVal sender As RealTimeStylus, ByVal data As PacketsData) _
 Implements IStylusAsyncPlugin.Packets
    ' For each new packet received, extract the x,y data
    ' and draw a small circle around the result.
    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.Green, point.X - 2, point.Y - 2, 4, 4)
    Next i
End Sub 'Packets