任意角度图片旋转

韩冰

void S_PicXZ(Graphics::TBitmap *Source,Graphics::TBitmap *NewPic,int angle)// ' d& e/ p. V2 g# e& }8 P{ if(angle>180)angle=360-angle; if(angle<-180)angle=360+angle;

float radians=(2*3.1416*angle)/360; 7 ?8 R+ [ C m+ Kfloat cosine=(float)cos(radians); + t) s1 a4 K, v5 f0 R$ W; K( tfloat sine=(float)sin(radians); n- E+ u4 q$ S) |+ P7 _0 C! `float Point1x=(-Source->Height*sine); float Point1y=(Source->Height*cosine); 5 W2 o( x$ a0 B' w: e( u6 ~float Point2x=(Source->Width*cosine-Source->Height*sine); float Point2y=(Source->Height*cosine+Source->Width*sine); float Point3x=(Source->Width*cosine); 5 L) B. [) }2 p& zfloat Point3y=(Source->Width*sine); ( e1 a+ F! |7 S' s. L _6 l( ]float minx=min((float)0,min(Point1x,min(Point2x,Point3x))); " {5 x ?* P% F4 M3 ?& L, hfloat miny=min((float)0,min(Point1y,min(Point2y,Point3y))); float maxx=max(Point1x,max(Point2x,Point3x)); . j1 a# R* k D5 \$ D7 `9 efloat maxy=max(Point1y,max(Point2y,Point3y)); , L1 V3 O' r' |+ Wint DestBitmapWidth,DestBitmapHeight; if(angle>90&&angle<180) ) }" w, s9 w1 MDestBitmapWidth=(int)ceil(-minx); ' ?! Z4 O, y0 b7 r/ B+ b$ ~else $ M) R; D' X) i/ R8 W- jDestBitmapWidth=(int)ceil(maxx-minx);

. t$ S1 E+ k& J6 ~& u2 D

if(angle>-180&&angle<-90) ( t- S: @1 b7 hDestBitmapHeight=(int)ceil(-miny); 1 ^0 k: L+ C: ^, f+ _3 zelse 8 E1 ]$ P0 l, x/ w$ ^9 DDestBitmapHeight=(int)ceil(maxy-miny);

NewPic->Height=DestBitmapHeight; NewPic->Width=DestBitmapWidth; for(int x=0;x<DestBitmapWidth;x++) { for(int y=0;y<DestBitmapHeight;y++){ ( W% B. A2 s+ b9 f! k& V( o2 Bint SrcBitmapx=(int)((x+minx)*cosine+(y+miny)*sine); , G$ } a6 ]' {int SrcBitmapy=(int)((y+miny)*cosine-(x+minx)*sine); if(SrcBitmapx>=0&&SrcBitmapx<Source->Width&&SrcBitmapy>=0&& SrcBitmapy<Source->Height) - i6 h) K! u/ R4 k. N# l8 j! B: F7 b{ / Q9 \ Z# W0 v& J" g. Z* hNewPic->Canvas->ixels[x][y]= & v4 P& v7 T$ Y9 ASource->Canvas->ixels[SrcBitmapx][SrcBitmapy]; 3 S: A- S, ^5 E2 E6 k# G} } } 9 @$ L9 r# W9 \9 G1 a}