vb中，怎么可以把一張圖片旋轉(zhuǎn)起來(lái)

這個(gè)問(wèn)題不是小問(wèn)題。如果只是90度轉(zhuǎn)，vb.net的picture控件有RotateFlip方法。

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任意角度，可以參考這個(gè)

;cs-lang=csharp

圖片的變換涉及坐標(biāo)處理，要自己算。

還有可以用Windows Presentation Foundation (WPF) 編程，里面的image控件好像也能旋轉(zhuǎn)圖片。

如果是VB6，恐怕只能用API函數(shù)了，百度一下“vb 旋轉(zhuǎn)圖片” “VB api函數(shù)”了解一下

vb里面怎么樣讓一張圖片旋轉(zhuǎn)？

'GetPixel和SetPixel太慢了.系統(tǒng)有現(xiàn)成的API用. '本例子需要兩個(gè)PictureBox,名稱分別為PicBack和PicShow.一個(gè)CommandButton,名稱:Command1. '在PicShow里載入一張圖片,然后運(yùn)行,點(diǎn)command1按鈕,你就可以看到效果. Option Explicit Private Declare Function PlgBlt Lib "gdi32" (ByVal hdcDest As Long, lpPoint As POINTAPI, ByVal hdcSrc As Long, ByVal nXSrc As Long, ByVal nYSrc As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hbmMask As Long, ByVal xMask As Long, ByVal yMask As Long) As Long Private Type POINTAPI x As Long y As Long End Type Const NotPI = 3.14159265238 / 180 Private Sub DanRotate(ByRef picDestHdc As Long, xPos As Long, yPos As Long, ByVal Angle As Long, ByRef picSrcHdc As Long, srcXoffset As Long, srcYoffset As Long, ByVal srcWidth As Long, ByVal srcHeight As Long) Dim Points(3) As POINTAPI Dim DefPoints(3) As POINTAPI Dim sSin As Single, sCos As Single Dim ret As Long Points(0).x = -srcWidth * 0.5 Points(0).y = -srcHeight * 0.5 Points(1).x = Points(0).x + srcWidth Points(1).y = Points(0).y Points(2).x = Points(0).x Points(2).y = Points(0).y + srcHeight sSin = Sin(Angle * NotPI) sCos = Cos(Angle * NotPI) DefPoints(0).x = (Points(0).x * sCos - Points(0).y * sSin) + xPos DefPoints(0).y = (Points(0).x * sSin + Points(0).y * sCos) + yPos DefPoints(1).x = (Points(1).x * sCos - Points(1).y * sSin) + xPos DefPoints(1).y = (Points(1).x * sSin + Points(1).y * sCos) + yPos DefPoints(2).x = (Points(2).x * sCos - Points(2).y * sSin) + xPos DefPoints(2).y = (Points(2).x * sSin + Points(2).y * sCos) + yPos PlgBlt picDestHdc, DefPoints(0), picSrcHdc, srcXoffset, srcYoffset, srcWidth, srcHeight, 0, 0, 0 End Sub Private Sub Form_Load() picShow.ScaleMode = vbPixels picBack.ScaleMode = vbPixels End Sub Private Sub Command1_Click() DanRotate picBack.hDC, 100, 100, 45, picShow.hDC, 0, 0, picShow.ScaleWidth,picShow.ScaleHeight '(函數(shù)解釋)DanRotate 目標(biāo)(輸出)的設(shè)備場(chǎng)景,X坐標(biāo),Y坐標(biāo),旋轉(zhuǎn)角度,源設(shè)備場(chǎng)景,源設(shè)備場(chǎng)景X坐標(biāo),源設(shè)備場(chǎng)景Y坐標(biāo) picBack.Refresh '刷新窗體 End Sub

怎么用vb實(shí)現(xiàn)圖形的旋轉(zhuǎn)？

啟動(dòng)vb6建立一個(gè)標(biāo)準(zhǔn)exe工程，首先添加兩個(gè)圖片框（picture1和picture2），添加三個(gè)命令按鈕command1（caption=“正常顯示”）、command2（caption=“180度倒立”）、command3（caption=“45度旋轉(zhuǎn)”），雙擊窗體，寫(xiě)入以下代碼：

PrivateConstSRCCOPY=HCC0020

PrivateConstPi=3.14

PrivateDeclareFunctionSetPixelLib"gdi32"(ByValhdcAsLong, ByValxAsLong,ByValyAsLong,ByValcrColorAsLong)AsLong

PrivateDeclareFunctionGetPixelLib"gdi32"(ByValhdcAsLong, ByValxAsLong,ByValyAsLong)AsLong

PrivateDeclareFunctionStretchBltLib"gdi32"(ByValhdcAsLong, ByValxAsLong,ByValyAsLong,ByValnWidthAsLong,ByValnHeightAsLong, ByValhSrcDCAsLong,ByValxSrcAsLong,ByValySrcAsLong,ByValnSrcWidth AsLong,ByValnSrcHeightAsLong,ByValdwRopAsLong)AsLong

privateSubbmp_rotate(pic1AsPictureBox,pic2AsPictureBox,ByValtheta)‘45度旋轉(zhuǎn)

Dimc1xAsInteger,c1yAsInteger

Dimc2xAsInteger,c2yAsInteger

DimaAsSingle

Dimp1xAsInteger,p1yAsInteger

Dimp2xAsInteger,p2yAsInteger

DimnAsInteger,rAsInteger

c1x=pic1.ScaleWidth\2

c1y=pic1.ScaleHeight\2

c2x=pic2.ScaleWidth\2

c2y=pic2.ScaleHeight\2

Ifc2x$#@60;c2yThenn=c2yElsen=c2x

n=n-1

pic1hDC=pic1.hdc

pic2hDC=pic2.hdc

Forp2x=0Ton

Forp2y=0Ton

Ifp2x=0Thena=Pi/2Elsea=Atn(p2y/p2x)

r=Sqr(1*p2x*p2x+1*p2y*p2y)

p1x=r*Cos(a+theta)

p1y=r*Sin(a+theta)

c0=GetPixel(pic1hDC,c1x+p1x,c1y+p1y)

c1=GetPixel(pic1hDC,c1x-p1x,c1y-p1y)

c2=GetPixel(pic1hDC,c1x+p1y,c1y-p1x)

c3=GetPixel(pic1hDC,c1x-p1y,c1y+p1x)

Ifc0$#@60;$#@62;-1ThenSetPixelpic2hDC,c2x+p2x,c2y+p2y,c0

Ifc1$#@60;$#@62;-1ThenSetPixelpic2hDC,c2x-p2x,c2y-p2y,c1

Ifc2$#@60;$#@62;-1ThenSetPi pic2hDC,c2x+p2y,c2y-p2x,c2

Ifc3$#@60;$#@62;-1ThenSetPixelpic2hDC,c2x-p2y,c2y+p2x,c3

Next

Next

EndSub

PrivateSubCommand1_Click()‘正常復(fù)制

Picture2.Cls

px=Picture1.ScaleWidth

py=Picture1.ScaleHeight

StretchBltPicture2.hdc,px,0,-px,py,Picture1.hdc,0,0,px,py,SRCCOPY

EndSub

PrivateSubCommand2_Click()‘180度倒立

Picture2.Cls

px=Picture1.ScaleWidth

py=Picture1.ScaleHeight

StretchBltPicture2.hdc,0,py,px,-py,Picture1.hdc,0,0,px,py,SRCCOPY

EndSub

PrivateSubCommand3_Click()‘45旋轉(zhuǎn)

Picture2.Cls

Callbmp_rotate(Picture1,Picture2,3.14/4)

EndSub

PrivateSubForm_Load()

OnErrorResumeNext

Me.Caption=App.Title"添加應(yīng)用程序標(biāo)題

Me.Left=(Screen.Width-Me.Width)/2

Me.Top=(Screen.Height-Me.Height)/2"窗體具中

Picture1.ScaleMode=3

Picture2.ScaleMode=3

EndSub

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