cline.vb

苏金明编写的《用VB.NET和VC#.NET开发交互式CAD系统》一书的源代码

'直线段类
Imports System.Drawing.Drawing2D

Public Class CLine

    Private m_Begin As PointF
    Private m_End As PointF

    '直线段的起点属性
    Public Property LBegin() As PointF
        Get
            Return m_Begin
        End Get
        Set(ByVal newValue As PointF)
            m_Begin = newValue
        End Set
    End Property

    '直线段的终点属性
    Public Property LEnd() As PointF
        Get
            Return m_End
        End Get
        Set(ByVal newValue As PointF)
            m_End = newValue
        End Set
    End Property

    '无参构造函数
    Public Sub New()
    End Sub

    '构造函数，用已知的两点构造直线段
    Public Sub New(ByVal pBegin As PointF, ByVal pEnd As PointF)
        m_Begin = pBegin
        m_End = pEnd
    End Sub

    '绘直线段
    Public Sub Draw(ByVal g As Graphics)
        g.CompositingQuality = CompositingQuality.HighQuality
        g.DrawLine(Pens.Red, m_Begin, m_End)
    End Sub

End Class