Graphics code snippet to let a 2D std::vector be drawn on a VCL TImage. To do the opposite, use ImageToVector.


#include <cassert>

#include <vector>

#include <vcl.h>



//Draws a (grey) TImage from a 2D-std::vector (y-x-ordered)

//From http://www.richelbilderbeek.nl/CppVectorToImage.htm

void VectorToImage(const std::vector<std::vector<int> >& v, const TImage * const image)

{

  assert(image!=0 && "Image must not be NULL");

  assert(image->Picture->Bitmap!=0 && "Bitmap must not be NULL");

  assert(image->Picture->Bitmap->PixelFormat == pf24bit && "Bitmap must be 24 bit");



  const int height = v.size();

  const int width  = v[0].size();



  image->Picture->Bitmap->Height = height;

  image->Picture->Bitmap->Width  = width;



  for (int y=0; y!=height; ++y)

  {

    assert(y >= 0);

    assert(y < static_cast<int>(v.size()));

    const std::vector<int>& vLine = v[y];

    unsigned char * const line

      = static_cast<unsigned char *>(image->Picture->Bitmap->ScanLine[y]);

    for (int x=0; x!=width; ++x)

    {

      assert(x >= 0);

      assert(x < static_cast<int>(vLine.size()));

      const int grey = vLine[x];

      line[x*3+2] = grey; //Red

      line[x*3+1] = grey; //Green

      line[x*3+0] = grey; //Blue

    }

  }

}

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(C++) VectorToImage