(C++) VectorToImage

 

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

 

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#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     }   } }