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用VB6轻松实现图片旋转

发布时间:2019-12-05 05:37:38 编辑:笔名

使用过ACDSEE的朋友一定对它的JPG图片旋转功能记忆犹新,其实我们利用VB6的先进功能,可以对任意格式的图片文件(包括JPG、GIF、BMP、ICO等)进行45度、180度旋转,确实可以和ACDSEE一较高下。

启动vb6建立一个标准exe工程,首先添加两个图片框(picture1和picture2),添加三个命令按钮command1(caption=“正常显示”)、command2(caption=“180度倒立”)、command3(caption=“45度旋转”),双击窗体,写入以下代码:

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度旋转

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<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&<>-1ThenSetPixelpic2hDC,c2x+p2x,c2y+p2y,c0

Ifc1&<>-1ThenSetPixelpic2hDC,c2x-p2x,c2y-p2y,c1

Ifc2&<>-1ThenSetPixelpic2hDC,c2x+p2y,c2y-p2x,c2

Ifc3&<>-1ThenSetPixelpic2hDC,c2x-p2y,c2y+p2x,c3

Next

Next

EndSub

PrivateSubCommand1_Click()‘正常复制

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旋转

Picture2.Cls

Callbmp_rotate(Picture1,Picture2,3.14/4)

EndSub

PrivateSubForm_Load()

onErrorResumeNext

Me.Caption=App.Title"添加应用程序标题

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

Me.Top=(Screen.Height-Me.Height)/2"窗体具中

Picture1.ScaleMode=3

Picture2.ScaleMode=3

EndSub

编者按:

网络上和图象处理的文章很多,但是还相当的散,希望能在开发者网络为大家做这么一个专题,搜集尽可能多的资料,也希望大家能来投稿,谢谢拉!

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