一闪一闪小星星

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介绍 很久以前,我需要给我的老板留下深刻印象。我们不得不年度讨论薪水。所以我写了一个应用程序显示“非常先进的编程技能”。 背景 现在我有翻译这个令人难以置信的VB.NET应用程序。 使用的代码 运行代码,您将看到所有的结果产生的代码。 的兴趣点 基本api: 隐藏,收缩,复制Code

Structure RECT
    Public Left As Int32
    Public Top As Int32
    Public Right As Int32
    Public Bottom As Int32
End Structure
 
Public Structure POINTAPI
    Dim X As Int32
    Dim Y As Int32
End Structure
 
 
    Declare Function DeleteObject Lib "gdi32" (ByVal hObject As IntPtr) As Boolean
    Declare Function GetStockObject Lib "gdi32.dll" (ByVal nIndex As Int32) As IntPtr
    Declare Function GetWindowRgn Lib "user32" (ByVal hwnd As IntPtr,
        ByVal hRgn As IntPtr) As IntPtr
    Declare Function SetWindowRgn Lib "user32" (ByVal hWnd As IntPtr,
        ByVal hRgn As IntPtr, ByVal bRedraw As Boolean) As Int32
 
    'for round form
    Declare Function CreateRoundRectRgn Lib "gdi32" (ByVal X1 As Int32, ByVal Y1 As Int32,
        ByVal X2 As Int32, ByVal Y2 As Int32, ByVal X3 As Int32, ByVal Y3 As Int32) As IntPtr
    'for star form
    Declare Function CreatePolygonRgn Lib "gdi32" (ByRef lpPoint As POINTAPI,
        ByVal nCount As Int32, ByVal nPolyFillMode As Int32) As IntPtr
    'for elliptic form
    Declare Function CreateEllipticRgn Lib "gdi32.dll" (ByVal X1 As Int32,
        ByVal Y1 As Int32, ByVal X2 As Int32, ByVal Y2 As Int32) As IntPtr
 
    Declare Function CreateRectRgn Lib "gdi32.dll" (ByVal X1 As Int32, ByVal Y1 As Int32,
        ByVal X2 As Int32, ByVal Y2 As Int32) As IntPtr
    Declare Function GetWindowDC Lib "user32" (ByVal hWnd As IntPtr) As IntPtr
    Declare Function ReleaseDC Lib "user32.dll" (ByVal hwnd As IntPtr,
        ByVal hdc As IntPtr) As Int32
 
    'for frame of form
    Declare Function FrameRgn Lib "gdi32" (ByVal hdc As IntPtr, ByVal hRgn As IntPtr,
        ByVal hBrush As IntPtr, ByVal nWidth As Int32, ByVal nHeight As Int32) As IntPtr
    Private Const BLACK_BRUSH As Int32 = 4

(注意:POINTAPI不在框架。) 恒星的制作: 隐藏,收缩,复制Code

Private Sub MakePolygonForm(ByVal InForm As Form, ByVal Offset As Single)
    Const WINDING As Int32 = 2
    Const RADIEKONVERT As Double = 3.1416 / 180
    Const GRADER As Int32 = 360
    Const MAXRADER As Int32 = 200
 
    'change this to 6 for a David star, try alsso 5,7,8,9,10
    Const SPETSAR As Int32 = 7
 
    Dim x, y As Int32
    Dim xCenter, yCenter, Radie, Punkter, I As Int32
    Dim Vinkel As Double
    Dim Rotation As Int32
    Dim arPoints(MAXRADER) As POINTAPI
    Dim RECT As RECT
    Dim rgn As IntPtr
 
    RECT.Right = 300
    RECT.Left = 0
    RECT.Top = 0
    RECT.Bottom = 300
    xCenter = CInt((RECT.Right - RECT.Left) / 2)
    yCenter = CInt((RECT.Bottom - RECT.Top) / 2)
 
    Rotation = CInt(GRADER / (2 * SPETSAR))
    Punkter = 2 * SPETSAR
    Radie = yCenter
    For I = 0 To Punkter - 1
        If (I Mod 2) = 0 Then
            Radie = CInt((Radie / 2))
        Else
            Radie = yCenter
        End If
        'remove Offset to make it stay put: Vinkel = I * Rotation * RADIEKONVERT
        Vinkel = I * Rotation * RADIEKONVERT + Offset
        x = CInt(xCenter + (System.Math.Cos(Vinkel) * Radie))
        y = CInt(yCenter + (System.Math.Sin(Vinkel) * Radie))
        arPoints(I).X = x
        arPoints(I).Y = y
    Next
    rgn = CreatePolygonRgn(arPoints(0), Punkter, WINDING)
    Call SetWindowRgn(Me.Handle, rgn, True)
    If CInt(rgn) <> 0 Then DeleteObject(rgn)
End Sub

如果你想要另一种形式的表单,使用: 隐藏,复制Code

MakeRoundForm(Me)

或者: 隐藏,复制Code

MakeEllipticForm(Me)

你可以调整FrameRgn框架的厚度: 隐藏,复制Code

Private Function FrameWindowRgn(ByVal hwnd As IntPtr) As IntPtr
Dim hRgn,hDC As IntPtr
hDC = GetWindowDC(hwnd)   ' Get a DC for non-client area
If CInt(hDC) <>   0 Then
hRgn = CreateRectRgn(0, 0, 0, 0) ' Create empty region
If CInt(hRgn) <>      0 Then
If CInt(GetWindowRgn(hwnd, hRgn)) <> 0 Then
' to make border thicker, adjust the 2:s to something else
FrameWindowRgn = FrameRgn(hDC,hRgn, GetStockObject(BLACK_BRUSH), 2, 2) ' Draw the frame
End If
End If
End If
If CInt(hRgn)  <>  0 Then DeleteObject(hRgn) 'release resources
If CInt(hDC)  <>  0 Then  ReleaseDC(hwnd, hDC) 'release resources
End Function

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