Dibujar líneas con las Apis de Windows

Una función para tener siempre a mano, sobre todo para cuando trabajemos con hdc en memoria.

Option Explicit
Private Declare Function OleTranslateColor Lib "oleaut32.dll" (ByVal lOleColor As Long, ByVal lHPalette As Long, lColorRef As Long) As Long
Private Declare Function CreatePen Lib "gdi32.dll" (ByVal nPenStyle As Long, ByVal nWidth As Long, ByVal crColor As Long) As Long
Private Declare Function MoveToEx Lib "gdi32" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long, ByVal lpPoint As Long) As Long
Private Declare Function DeleteObject Lib "gdi32.dll" (ByVal hObject As Long) As Long
Private Declare Function SelectObject Lib "gdi32.dll" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function LineTo Lib "gdi32.dll" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long) As Long
 
 
Public Sub DrawLine(ByVal hdc As Long, _
                    ByVal X1 As Long, _
                    ByVal Y1 As Long, _
                    ByVal X2 As Long, _
                    ByVal Y2 As Long, _
                    Optional ByVal Color As Long = -1, _
                    Optional ByVal BorderWidth As Long = 1)
 
    Dim hPen As Long
    Dim TransColor As Long
    Dim OldPen As Long
 
    If Color <> -1 Then
        Call OleTranslateColor(Color, 0&, TransColor)
        hPen = CreatePen(0, BorderWidth, TransColor)
        OldPen = SelectObject(hdc, hPen)
    End If
 
    If X1 >= 0 Then
        MoveToEx hdc, X1, Y1, 0
    End If
 
    LineTo hdc, X2, Y2
 
    If hPen <> 0 Then
        SelectObject hdc, OldPen
        DeleteObject hPen
    End If
 
End Sub