The two arrays can now be used as a coordinate system to access any part of the grid, for example the
bottom left edge of the grid is at coordinate m_nGridX[1] by m_nGridY[1] and the top right edge of the grid is
at coordinate m_nGridX[100] by m_nGridY[80]. Drawing of the grid and waveform traces is achieved using
this coordinate system, the main advantage of this is that it does not matter what size the scope display is,
the only thing that needs to change is the values contain within the coordinate arrays (extremely flexible).