Exemple de code VB pour faire une rotation d'image, un effets 3D, une conversion en niveau de gris, ou inverser simplement les couleurs... Le tous TRES RAPIDEMENT (passage par des API de base du GDI).
Source / Exemple :
VERSION 5.00
Begin VB.Form Form1
Caption = "Pivoter Bitmap"
ClientHeight = 7425
ClientLeft = 60
ClientTop = 345
ClientWidth = 7350
LinkTopic = "Form1"
ScaleHeight = 7425
ScaleWidth = 7350
StartUpPosition = 3 'Windows Default
Begin VB.CommandButton Round
Caption = "effet 3D"
Height = 375
Left = 5160
TabIndex = 4
Top = 120
Width = 855
End
Begin VB.CommandButton Gray
Caption = "Gay"
Height = 375
Left = 3720
TabIndex = 3
Top = 120
Width = 1095
End
Begin VB.CommandButton Inverse
Caption = "Inverse"
Height = 375
Left = 2280
TabIndex = 2
Top = 120
Width = 1095
End
Begin VB.PictureBox Pic1
Appearance = 0 'Flat
AutoRedraw = -1 'True
AutoSize = -1 'True
BackColor = &H80000005&
BorderStyle = 0 'None
ForeColor = &H80000008&
Height = 4860
Left = 480
Picture = "Bitmap.frx":0000
ScaleHeight = 324
ScaleMode = 3 'Pixel
ScaleWidth = 432
TabIndex = 1
Top = 840
Width = 6480
End
Begin VB.CommandButton CmdPivot
Caption = "Pivoter"
Height = 375
Left = 840
TabIndex = 0
Top = 120
Width = 1095
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'-------------------------------------------------------------------------------------------------------
' (C) Patrick MOIRE
' http://jeux.cartes.free.fr
'-------------------------------------------------------------------------------------------------------
' Le code Original de la rotation n'est pas de moi. Je l'ai corrigé (ne fonctionnait pas dans toutes les
' résolution, et apporté les autres effets...
'-------------------------------------------------------------------------------------------------------
Private Declare Function SetDIBits Lib "gdi32" (ByVal hdc As Long, ByVal hBitmap As Long, ByVal nStartScan As Long, ByVal nNumScans As Long, lpBits As Any, lpBI As BITMAPINFO, ByVal wUsage As Long) As Long
Private Declare Function GetDIBits Lib "gdi32" (ByVal aHDC As Long, ByVal hBitmap As Long, ByVal nStartScan As Long, ByVal nNumScans As Long, lpBits As Any, lpBI As BITMAPINFO, ByVal wUsage As Long) As Long
Private Declare Function GetObject Lib "gdi32" Alias "GetObjectA" (ByVal hObject As Long, ByVal nCount As Long, lpObject As Any) As Long
Private Declare Function GetForegroundWindow Lib "user32" () As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function GetBitmapBits Lib "gdi32" (ByVal hBitmap As Long, ByVal dwCount As Long, lpBits As Any) As Long
Private Declare Function SetBitmapBits Lib "gdi32" (ByVal hBitmap As Long, ByVal dwCount As Long, lpBits As Any) As Long
Private Type BITMAP
bmType As Long
bmWidth As Long
bmHeight As Long
bmWidthBytes As Long
bmPlanes As Integer
bmBitsPixel As Integer
bmBits As Long
End Type
Private Type BITMAPINFOHEADER
biSize As Long
biWidth As Long
biHeight As Long
biPlanes As Integer
biBitCount As Integer
biCompression As Long
biSizeImage As Long
biXPelsPerMeter As Long
biYPelsPerMeter As Long
biClrUsed As Long
biClrImportant As Long
End Type
Private Type RGBQUAD
rgbBlue As Byte
rgbGreen As Byte
rgbRed As Byte
rgbReserved As Byte
End Type
Private Type BITMAPINFO
bmiHeader As BITMAPINFOHEADER
bmiColors As RGBQUAD
End Type
Dim BMPINFO As BITMAPINFO
Dim BMPINFOH As BITMAPINFOHEADER
Dim Buffer() As RGBQUAD
'-------------------------------------------------------------------------------------------------------
Private Sub CmdPivot_Click()
'- - - Working
Dim Buffer() As RGBQUAD
Dim Result() As RGBQUAD
Dim PicInfo As BITMAP
Dim Width As Long
Dim Height As Long
Dim hdc As Long
'- - - Capture un "Device Contexte" valide !
hdc = GetDC(GetForegroundWindow())
'- - - Copie de l'image courante dans le tampon
GetObject Me.Pic1.Image, Len(PicInfo), PicInfo
Width = PicInfo.bmWidth
Height = PicInfo.bmHeight
ReDim Buffer(0 To Width - 1, 0 To Height - 1)
With BMPINFOH
.biBitCount = 32
.biHeight = Height
.biWidth = Width
.biPlanes = 1
.biSize = Len(BMPINFOH)
End With
BMPINFO.bmiHeader = BMPINFOH
GetDIBits hdc, Me.Pic1.Image.Handle, 0, Height, Buffer(0, 0), BMPINFO, 0
'- - - Rotation...
Dim X As Long
Dim Y As Long
Dim XX As Long
Dim YY As Long
X = UBound(Buffer, 1)
Y = UBound(Buffer, 2)
ReDim Result(0 To Y, 0 To X)
For XX = 0 To X
For YY = 0 To Y
Result(Y - YY, XX) = Buffer(XX, YY) 'Result(Yy, X - Xx) = Buffer(Xx, Yy)
Next YY
Next XX
'- - - modifiy l'aspect du controle Picture (cas ou il n'est pas carré !)
Dim l As Single
l = Me.Pic1.Width
Me.Pic1.Width = Pic1.Height
Me.Pic1.Height = l
With BMPINFOH
.biBitCount = 32
.biHeight = Width
.biWidth = Height
.biPlanes = 1
.biSize = Len(BMPINFOH)
End With
BMPINFO.bmiHeader = BMPINFOH
'- - - Restaure l'image sur le controle
Set Me.Pic1.Picture = Nothing
SetDIBits hdc, Me.Pic1.Image.Handle, 0, Width, Result(0, 0), BMPINFO, 0
End Sub
'-------------------------------------------------------------------------------------------------------
' Merci à Jacky, Martin !
Private Sub Gray_Click()
'- - - - Working
Dim Cnt As Long
Dim PicBits() As Byte
Dim PicInfo As BITMAP
Dim Gray As Byte
'- - - Une Seul fois !
Me.Gray.Enabled = False
'- - - Lecture caracteristique de l'image
GetObject Me.Pic1.Image, Len(PicInfo), PicInfo
ReDim PicBits(1 To PicInfo.bmWidth * PicInfo.bmHeight * 4) As Byte
GetBitmapBits Pic1.Image, UBound(PicBits), PicBits(1)
'- - - Conversion des bits couleur selon le standard de l'International Telecommunication Union (ITU) : Gray scale=(222*Red+707*Green+71*Blue)/1000
' Voir http://www.neuro.sfc.keio.ac.jp/~aly/polygon/info/color-space-faq.html
For Cnt = 1 To UBound(PicBits) Step 4
Gray = (222 * CLng(PicBits(Cnt)) + 707 * CLng(PicBits(Cnt + 1)) + 71 * CLng(PicBits(Cnt + 2))) / 1000
PicBits(Cnt) = Gray
PicBits(Cnt + 1) = Gray
PicBits(Cnt + 2) = Gray
Next Cnt
'- - - Restaure l'image sur le controle
SetBitmapBits Me.Pic1.Image, UBound(PicBits), PicBits(1)
Me.Pic1.Refresh
End Sub
'-------------------------------------------------------------------------------------------------------
Private Sub Inverse_Click()
'- - - - Working
Dim Cnt As Long, BytesPerLine As Long
Dim PicBits() As Byte, PicInfo As BITMAP
'- - - Lecture caracteristique de l'image
GetObject Me.Pic1.Image, Len(PicInfo), PicInfo
BytesPerLine = (PicInfo.bmWidth * 3 + 3) And &HFFFFFFFC
ReDim PicBits(1 To BytesPerLine * PicInfo.bmHeight * 3) As Byte
GetBitmapBits Me.Pic1.Image.Handle, UBound(PicBits), PicBits(1)
'- - - Inverse les bits...
For Cnt = 1 To UBound(PicBits)
PicBits(Cnt) = 255 - PicBits(Cnt)
Next Cnt
'- - - Restaure l'image sur le controle
SetBitmapBits Me.Pic1.Image.Handle, UBound(PicBits), PicBits(1)
Me.Pic1.Refresh
End Sub
'-------------------------------------------------------------------------------------------------------
Private Sub Round_Click()
'- - - Working
Dim PicInfo As BITMAP
' Dim Buffer() As RGBQUAD
Dim hdc As Long
'- - - Une Seul fois !
Me.Round.Enabled = False
'- - - Copie de l'image courante dans le tampon
GetObject Me.Pic1.Image, Len(PicInfo), PicInfo
ReDim Buffer(0 To PicInfo.bmWidth - 1, 0 To PicInfo.bmHeight - 1)
With BMPINFOH
.biBitCount = 32
.biHeight = PicInfo.bmHeight
.biWidth = PicInfo.bmWidth
.biPlanes = 1
.biSize = Len(BMPINFOH)
End With
BMPINFO.bmiHeader = BMPINFOH
hdc = GetDC(GetForegroundWindow())
GetDIBits hdc, Me.Pic1.Image.Handle, 0, PicInfo.bmHeight, Buffer(0, 0), BMPINFO, 0
'- - - Rotation...
Dim X As Long
Dim Y As Long
Dim XX As Long
Dim YY As Long
X = UBound(Buffer, 1)
Y = UBound(Buffer, 2)
Dim Taux As Integer
For XX = 0 To 5
For YY = XX To Y - XX
Taux = (120 - 20 * XX)
Buffer(XX, YY).rgbBlue = Maxi(0, Buffer(XX, YY).rgbBlue - Taux)
Buffer(XX, YY).rgbGreen = Maxi(0, Buffer(XX, YY).rgbGreen - Taux)
Buffer(XX, YY).rgbRed = Maxi(0, Buffer(XX, YY).rgbRed - Taux)
Buffer(X - XX, YY).rgbBlue = Mini(255, Buffer(X - XX, YY).rgbBlue + Taux)
Buffer(X - XX, YY).rgbGreen = Mini(255, Buffer(X - XX, YY).rgbGreen + Taux)
Buffer(X - XX, YY).rgbRed = Mini(255, Buffer(X - XX, YY).rgbRed + Taux)
Next YY
Next XX
For YY = 0 To 5
For XX = YY To X - YY
Taux = (120 - 20 * YY)
Buffer(XX, YY).rgbBlue = Maxi(0, Buffer(XX, YY).rgbBlue - Taux)
Buffer(XX, YY).rgbGreen = Maxi(0, Buffer(XX, YY).rgbGreen - Taux)
Buffer(XX, YY).rgbRed = Maxi(0, Buffer(XX, YY).rgbRed - Taux)
Buffer(XX, Y - YY).rgbBlue = Mini(255, Buffer(XX, Y - YY).rgbBlue + Taux)
Buffer(XX, Y - YY).rgbGreen = Mini(255, Buffer(XX, Y - YY).rgbGreen + Taux)
Buffer(XX, Y - YY).rgbRed = Mini(255, Buffer(XX, Y - YY).rgbRed + Taux)
Next XX
Next YY
'- - - Restaure l'image sur le controle
Set Me.Pic1.Picture = Nothing
SetDIBits hdc, Me.Pic1.Image.Handle, 0, PicInfo.bmHeight, Buffer(0, 0), BMPINFO, 0
End Sub
Private Function Mini(V1 As Integer, V2 As Integer) As Byte
If V1 > V2 Then Mini = V2 Else Mini = V1
End Function
Private Function Maxi(V1 As Integer, V2 As Integer) As Byte
If V1 > V2 Then Maxi = V1 Else Maxi = V2
End Function
Conclusion :
Le code Original de la rotation n'est pas de moi. Je l'ai corrigé (ne fonctionnait pas dans toutes les résolutions, et apporté les autres effets...
Vous n'êtes pas encore membre ?
inscrivez-vous, c'est gratuit et ça prend moins d'une minute !
Les membres obtiennent plus de réponses que les utilisateurs anonymes.
Le fait d'être membre vous permet d'avoir un suivi détaillé de vos demandes et codes sources.
Le fait d'être membre vous permet d'avoir des options supplémentaires.