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TPaintBox *Image2 = new TPaintBox(this);
Image2->Parent=this;
Image2->Enabled=false;
if(angle>180)angle=360-angle;
if(angle<-180)angle=360+angle;
float radians=(2*3.1416*angle)/360;
float cosine=(float)cos(radians);
float sine=(float)sin(radians);
float Point1x=(-Image1->Height*sine);
float Point1y=(Image1->Height*cosine);
float Point2x=(Image1->Width*cosine-Image1->Height*sine);
float Point2y=(Image1->Height*cosine+Image1->Width*sine);
float Point3x=(Image1->Width*cosine);
float Point3y=(Image1->Width*sine);
float minx=min(0,min(Point1x,min(Point2x,Point3x)));
float miny=min(0,min(Point1y,min(Point2y,Point3y)));
float maxx=max(Point1x,max(Point2x,Point3x));
float maxy=max(Point1y,max(Point2y,Point3y));
int DestBitmapWidth,DestBitmapHeight;
if(angle>90&&angle<180)
DestBitmapWidth=(int)ceil(-minx);
else
DestBitmapWidth=(int)ceil(maxx-minx);
if(angle>-180&&angle<-90)
DestBitmapHeight=(int)ceil(-miny);
else
DestBitmapHeight=(int)ceil(maxy-miny);
Image2->Height=DestBitmapHeight;
Image2->Width=DestBitmapWidth;
for(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);
if(SrcBitmapx>=0&&SrcBitmapx<Image1->Width&&SrcBitmapy>=0&&
SrcBitmapy<Image1->Height)
{
Image2->Canvas->Pixels[x][y]=PaintBox1->Canvas->Pixels[SrcBitmapx][SrcBitmapy];
}
}
}
BitBlt(PaintBox1->Canvas->Handle, 0, 0, PaintBox1->ClientWidth, PaintBox1->ClientHeight, Image2->Canvas->Handle, 0, 0, SRCCOPY);
delete Image2;
TPngImage *tmpJpeg=new TPngImage;
tmpJpeg->LoadFromStream(MemoryImageStream);
之后可以对tmpJpeg进行旋转吗