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Код

#include <algorithm>
#include <math.h>
using namespace std;

void __fastcall TForm1::Rotate(void)
{
//поворот
    Graphics::TBitmap* BitmapOriginal;
    Graphics::TBitmap* BitmapRotated;
    int i, iRotationAxis, iOriginal, iPrime, iPrimeRotated;
    int j, jRotationAxis, jOriginal, jPrime, jPrimeRotated,max_p;
    bool Fv;
    double Theta, cosTheta, sinTheta;
    RGBTRIPLE* RowOriginal, *RowRotated;
    BitmapOriginal = new Graphics::TBitmap;
    BitmapRotated = new Graphics::TBitmap;
 BitmapOriginal->Assign(Image1->Picture->Graphic);
//==================
    if (BitmapOriginal->PixelFormat != pf24bit)
    {BitmapOriginal->PixelFormat = pf24bit;}
    BitmapRotated->PixelFormat = pf24bit;

    BitmapRotated->Width = BitmapOriginal->Height;
    BitmapRotated->Height = BitmapOriginal->Width;

    if (BitmapOriginal->Height>BitmapOriginal->Width)
    {
    //верт
    max_p = max(BitmapRotated->Width, BitmapRotated->Height);
    iRotationAxis = max_p/2;
    jRotationAxis = max_p/2;
    }
    else
    {
    //гор
    max_p = min(BitmapRotated->Width, BitmapRotated->Height);
    iRotationAxis = max_p/2;
    jRotationAxis = max_p/2;
    }

    Theta = -(90 + 0/100 ) * M_PI/180;
    sinTheta = sin(Theta);
    cosTheta = cos(Theta);

    for ( j = BitmapRotated->Height-1; j >= 0 ;  j--)
    {
        RowRotated = (RGBTRIPLE*)BitmapRotated->ScanLine[j];
        jPrime = 2 * (j - jRotationAxis) + 1;
        for ( i = BitmapRotated->Width-1; i >= 0; i--)
        {
            iPrime = 2 * (i - iRotationAxis) + 1;
            iPrimeRotated = int(iPrime * cosTheta - jPrime * sinTheta);
            jPrimeRotated = int(iPrime * sinTheta + jPrime * cosTheta);
            iOriginal = (iPrimeRotated - 1)/2 + iRotationAxis;
            jOriginal = (jPrimeRotated - 1)/2 + jRotationAxis;

            if ( (iOriginal >= 0) && (iOriginal <= BitmapOriginal->Width-1) && (jOriginal >= 0) && (jOriginal <= BitmapOriginal->Height-1) )
            {
                RowOriginal = (RGBTRIPLE*)BitmapOriginal->ScanLine[jOriginal];
                RowRotated[i] = RowOriginal[iOriginal];
            }
            else
            {
                RowRotated[i].rgbtBlue  = 255;
                RowRotated[i].rgbtGreen = 0;
                RowRotated[i].rgbtRed   = 0;
            }
        }
    }
//===============
Image1->Picture->Assign(BitmapRotated);
//--------------------
BitmapRotated->Free();
{BitmapOriginal->Free();
}
//---------------------------------------------------------------------------