任意角度图片旋转

韩冰

void S_PicXZ(Graphics::TBitmap *Source,Graphics::TBitmap *NewPic,int angle)// * ]9 z+ A0 g0 B* P. y4 j& c{ 2 j6 g$ q" ?. L; Nif(angle>180)angle=360-angle; ( Q/ z0 _ H, T2 N+ \; gif(angle<-180)angle=360+angle;

float radians=(2*3.1416*angle)/360; float cosine=(float)cos(radians); float sine=(float)sin(radians); ` V" ` j3 `7 c _& Cfloat Point1x=(-Source->Height*sine); float Point1y=(Source->Height*cosine); $ ~# u; f% @! s1 Y$ ?4 B+ Ufloat Point2x=(Source->Width*cosine-Source->Height*sine); ) n4 J; b5 o5 Ofloat Point2y=(Source->Height*cosine+Source->Width*sine); + F( l6 M! t2 W# n1 v6 Sfloat Point3x=(Source->Width*cosine); float Point3y=(Source->Width*sine); float minx=min((float)0,min(Point1x,min(Point2x,Point3x))); $ Q% V2 r1 [1 U" P# r2 f. j, c! Qfloat miny=min((float)0,min(Point1y,min(Point2y,Point3y))); $ C' d. n8 _- ]$ B1 c" {! I" s$ r! ifloat maxx=max(Point1x,max(Point2x,Point3x)); 1 H* I* @% @* ^, z* c4 B- Xfloat maxy=max(Point1y,max(Point2y,Point3y)); / i$ x9 ]6 z7 }4 Eint DestBitmapWidth,DestBitmapHeight; ! ^8 L3 t' s4 }, Z: k. V) j: Bif(angle>90&&angle<180) DestBitmapWidth=(int)ceil(-minx); ( ^( ^! Q: ^7 D0 m& u; Gelse ) T5 V4 h, i" \; B, MDestBitmapWidth=(int)ceil(maxx-minx);

if(angle>-180&&angle<-90) 7 E; \# F+ W8 J0 ~+ d( p0 RDestBitmapHeight=(int)ceil(-miny); 3 t4 i; Q" a1 A8 telse DestBitmapHeight=(int)ceil(maxy-miny);

NewPic->Height=DestBitmapHeight; NewPic->Width=DestBitmapWidth; % u! ?& B8 ?- p7 w# f8 o1 wfor(int x=0;x<DestBitmapWidth;x++) { for(int y=0;y<DestBitmapHeight;y++){ int SrcBitmapx=(int)((x+minx)*cosine+(y+miny)*sine); int SrcBitmapy=(int)((y+miny)*cosine-(x+minx)*sine); 8 L3 {) K' \) k! s7 N" L+ s# ~2 Bif(SrcBitmapx>=0&&SrcBitmapx<Source->Width&&SrcBitmapy>=0&& SrcBitmapy<Source->Height) { NewPic->Canvas->ixels[x][y]= 1 q' T. _1 i1 {Source->Canvas->ixels[SrcBitmapx][SrcBitmapy]; } } 9 d1 k7 e4 a- Q$ q} 1 L, \' J0 u% w; z4 }$ P: f}