求助各位大牛！关于VB.NET淡入淡出效果

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

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

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？

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

你好，求教vb怎样实现窗体 打开关闭时淡入淡出并慢慢从中心到四周方向扩散的动画效果？

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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