Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
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If Me.Opacity 1 Then
Me.Opacity += 0.01
Else
Timer1.Enabled = False
End If
End Sub
Private Sub Timer2_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer2.Tick
If Me.Opacity 0 Then
Me.Opacity -= 0.01
Else
Me.Close()
End If
End Sub
用VB编程实现窗体背景由上至下的颜色逐渐变浅
很多应用程序的安装界面都采用了标准的由蓝到黑渐变的背景,你可以用如下代码实现这种效果
Sub Dither(vForm As Form)
Dim intLoop As Integer
vForm.DrawStyle = vbInsideSolid
vForm.DrawMode = vbCopyPen
vForm.ScaleMode = vbPixels
vForm.DrawWidth = 2
vForm.ScaleHeight = 256
For intLoop = 0 To 255
vForm.Line (0, intLoop)-(Screen.Width, intLoop - 1), RGB(0, 0, 255 - intLoop), B
Next intLoop
End Sub
Private Sub Form_Activate()
Dither Me
End Sub
将窗体的AutoRedraw属性设为True.
如果想得到由红到黑的渐变,只需如下改动:
vForm.Line (0, intLoop)-(Screen.Width, intLoop - 1), RGB(255 - intLoop, 0, 0), B
以下是由绿到黑的渐变效果
vForm.Line (0, intLoop)-(Screen.Width, intLoop - 1), RGB(0,255 - intLoop, 0), B
也容易，如果是黑白三个颜色加上相同的渐变量，彩色的是起始颜色的三个分量与终止颜色的对应三个分量的差值，再除于相同的份数，就得出三原色各自的步进量。
窗体上放个图片框试试下面代码：
Private Sub PictureBox1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint
Dim startColor As Color = Color.Red
Dim endColor As Color = Color.Green
Dim s As String = "vb点虐 如何使文字能渐变颜色，就是颜色慢慢变淡然后在慢慢恢复？"
Dim Steps As Integer = s.Length \ 2
Dim StepR As Integer = (CInt(endColor.R) - startColor.R) \ Steps
Dim StepG As Integer = (CInt(endColor.G) - startColor.G) \ Steps
Dim StepB As Integer = (CInt(endColor.B) - startColor.B) \ Steps
Dim R As Integer = startColor.R
Dim G As Integer = startColor.G
Dim B As Integer = startColor.B
Dim drawFont As New System.Drawing.Font("Arial", 16)
Dim X As Integer = 50
For i As Integer = 1 To Steps
Dim drawBrush As New SolidBrush(Color.FromArgb(R, G, B))
e.Graphics.DrawString(s.Substring(i - 1, 1), drawFont, drawBrush, X, 50.0)
X += 18
R += StepR
G += StepG
B += StepB
Next
For i As Integer = 1 To Steps
Dim drawBrush As New SolidBrush(Color.FromArgb(R, G, B))
e.Graphics.DrawString(s.Substring(i + Steps - 1, 1), drawFont, drawBrush, X, 50.0)
X += 18
R -= StepR
G -= StepG
B -= StepB
Next
End Sub
首先你得有个FORM1,然后添加一个模块，写入下面：
Const GWL_WNDPROC = (-4)
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" ( _
ByVal hWnd As Long, _
ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" ( _
ByVal hWnd As Long, _
ByVal nIndex As Long, _
ByVal dwNewLong As Long) As Long
Const PROP_PREVPROC = "PrevProc"
Const PROP_FORM = "FormObject"
Private Declare Function SetProp Lib "user32" Alias "SetPropA" ( _
ByVal hWnd As Long, _
ByVal lpString As String, _
ByVal hData As Long) As Long
Private Declare Function GetProp Lib "user32" Alias "GetPropA" ( _
ByVal hWnd As Long, _
ByVal lpString As String) As Long
Private Declare Function RemoveProp Lib "user32" Alias "RemovePropA" ( _
ByVal hWnd As Long, _
ByVal lpString As String) As Long
Private Declare Sub MoveMemory Lib "kernel32" Alias "RtlMoveMemory" ( _
Dest As Any, _
Src As Any, _
ByVal DestL As Long)
Const WM_PRINTCLIENT = H318
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Declare Function GetClientRect Lib "user32" ( _
ByVal hWnd As Long, _
lpRect As RECT) As Long
Private Declare Function apiOleTranslateColor Lib "oleaut32" Alias "OleTranslateColor" ( _
ByVal lOleColor As Long, _
ByVal lHPalette As Long, _
lColorRef As Long) As Long
Enum AnimateWindowFlags
AW_HOR_POSITIVE = H1
AW_HOR_NEGATIVE = H2
AW_VER_POSITIVE = H4
AW_VER_NEGATIVE = H8
AW_CENTER = H10
AW_HIDE = H10000
AW_ACTIVATE = H20000
AW_SLIDE = H40000
AW_BLEND = H80000
End Enum
Private Declare Function apiAnimateWindow Lib "user32" Alias "AnimateWindow" ( _
ByVal hWnd As Long, _
ByVal dwTime As Long, _
ByVal dwFlags As Long) As Long
Private Declare Function MulDiv Lib "kernel32" ( _
ByVal Mul As Long, _
ByVal Nom As Long, _
ByVal Den As Long) As Long
Private Declare Function CreateSolidBrush Lib "gdi32" ( _
ByVal crColor As Long) As Long
Private Declare Function BitBlt Lib "gdi32" ( _
ByVal hDestDC As Long, _
ByVal x As Long, _
ByVal y As Long, _
ByVal nWidth As Long, _
ByVal nHeight As Long, _
ByVal hSrcDC As Long, _
ByVal xSrc As Long, _
ByVal ySrc As Long, _
ByVal dwRop As Long) As Long
Private Declare Function GetDC Lib "user32" ( _
ByVal hWnd As Long) As Long
Private Declare Function CreateCompatibleDC Lib "gdi32" ( _
ByVal hDC As Long) As Long
Private Declare Function ReleaseDC Lib "user32" ( _
ByVal hWnd As Long, _
ByVal hDC As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" ( _
ByVal hDC As Long) As Long
Private Declare Function FillRect Lib "user32" ( _
ByVal hDC As Long, _
lpRect As RECT, _
ByVal hBrush As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" ( _
ByVal hObject As Long) As Long
Private Declare Function SelectObject Lib "gdi32" ( _
ByVal hDC As Long, _
ByVal hObject As Long) As Long
Private Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" ( _
ByVal lpPrevWndFunc As Long, _
ByVal hWnd As Long, _
ByVal Msg As Long, _
ByVal wParam As Long, _
ByVal lParam As Long) As Long
''注释:
''注释: AnimateWindow
''注释:
''注释： Wrapper for AnimateWindow api
'注释:
Sub AnimateWindow( _
ByVal Form As Form, _
ByVal dwTime As Long, _
ByVal dwFlags As AnimateWindowFlags)
'注释： Set the properties
SetProp Form.hWnd, PROP_PREVPROC, GetWindowLong(Form.hWnd, GWL_WNDPROC)
SetProp Form.hWnd, PROP_FORM, ObjPtr(Form)
'注释： Subclass the window
SetWindowLong Form.hWnd, GWL_WNDPROC, AddressOf AnimateWinProc
'注释： Call AnimateWindow API
apiAnimateWindow Form.hWnd, dwTime, dwFlags
'注释： Unsubclass the window
SetWindowLong Form.hWnd, GWL_WNDPROC, GetProp(Form.hWnd, PROP_PREVPROC)
'注释： Remove the properties
RemoveProp Form.hWnd, PROP_FORM
RemoveProp Form.hWnd, PROP_PREVPROC
'注释： Refresh the form
Form.Refresh
End Sub
'注释:
'注释: AnimateWinProc
'注释:
'注释： Window procedure for AnimateWindow
'注释:
Private Function AnimateWinProc( _
ByVal hWnd As Long, _
ByVal Msg As Long, _
ByVal wParam As Long, _
ByVal lParam As Long) As Long
Dim lPrevProc As Long
Dim lForm As Long
Dim oForm As Form
'注释： Get the previous WinProc pointer
lPrevProc = GetProp(hWnd, PROP_PREVPROC)
'注释： Get the form object
lForm = GetProp(hWnd, PROP_FORM)
MoveMemory oForm, lForm, 4
Select Case Msg
Case WM_PRINTCLIENT
Dim tRect As RECT
Dim hBr As Long
'注释： Get the window client size
GetClientRect hWnd, tRect
'注释： Create a brush with the
'注释： form background color
hBr = CreateSolidBrush(OleTranslateColor(oForm.BackColor))
'注释： Fill the DC with the
'注释: background Color
FillRect wParam, tRect, hBr
'注释： Delete the brush
DeleteObject hBr
If Not oForm.Picture Is Nothing Then
Dim lScrDC As Long
Dim lMemDC As Long
Dim lPrevBMP As Long
'注释： Create a compatible DC
lScrDC = GetDC(0)
lMemDC = CreateCompatibleDC(lScrDC)
ReleaseDC 0, lScrDC
'注释： Select the form picture in the DC
lPrevBMP = SelectObject(lMemDC, oForm.Picture.Handle)
'注释： Draw the picture in the DC
BitBlt wParam, _
0, 0, _
HM2Pix(oForm.Picture.Width), HM2Pix(oForm.Picture.Height), _
lMemDC, 0, 0, vbSrcCopy
'注释： Release the picture
SelectObject lMemDC, lPrevBMP
'注释： Delete the DC
DeleteDC lMemDC
End If
End Select
'注释： Release the form object
MoveMemory oForm, 0, 4
'注释： Call the original window procedure
AnimateWinProc = CallWindowProc(lPrevProc, hWnd, Msg, wParam, lParam)
End Function
'注释:
'注释: HM2Pix
'注释:
'注释： Converts HIMETRIC to Pixel
'注释:
Private Function HM2Pix(ByVal Value As Long) As Long
HM2Pix = MulDiv(Value, 1440, 2540) / Screen.TwipsPerPixelX
End Function
'注释:
'注释: OleTranslateColor
'注释:
'注释： Wrapper for OleTranslateColor API
'注释:
Private Function OleTranslateColor(ByVal Clr As Long) As Long
apiOleTranslateColor Clr, 0, OleTranslateColor
End Function
...........................................................................
在form1的unload里面写入
Private Sub Form_Unload(Cancel As Integer)
AnimateWindow Me, 1000, H80000 + H10000
Set Form1 = Nothing
End Sub
...............................运行，关闭看看特效。。窗口隐身而出。。。没有的话，联系我。。呵呵 我是KELVIN，联系我
Private Declare Function AnimateWindow Lib "user32" (ByVal hwnd As Long, ByVal dwTime As Long, ByVal dwFlags As Long) As Long
其中：
hwnd只对Form有效，其他像Picture1都无法产生效果。
dwTime是动画持续的时间，默认为200。
dwFlags可取以下值：
AW_HOR_POSITIVE （ H1 ） '从左到右打开窗口
AW_HOR_NEGATIVE （ H2 ） '从右到左打开窗口
AW_VER_POSITIVE （ H4 ） '从上到下打开窗口
AW_VER_NEGATIVE （ H8 ） '从下到上打开窗口
AW_CENTER （ H10 ） '看不出任何效果
AW_HIDE （H10000） '在窗体卸载时若想使用本函数就得加上此常量
AW_ACTIVATE （H20000） '在窗体通过本函数打开后，默认情况下会失去焦点，除非加上本常量
AW_SLIDE （H40000） '看不出任何效果
AW_BLEND （H80000） '淡入淡出效果
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