Problem:Raster Rendering && Output With Z-Factor && Schemes

MapWinGIS
1

1.How setup Raster Z-Factor(vertical exaggeration factor) when Raster Rendering(Drawing),code seg as follows:
Maybe need add setup z-factor code to here:
File:GdalRaster.cpp
Function:bool GdalRaster::ReadBandDataAsGridCore(colour** ImageData, int xOff, int yOff, int width, int height, int xBuff, int yBuff, bool setRGBToGrey)
Code seg:

			if( colortype == Hillshade )
			{
				float yone = 0, ytwo = 0, ythree = 0;

				// Exclude the edges 
				if (i == 0 || j == 0 || i == yBuff - 1 || j == xBuff - 1)
				{
					// We are at the edge so write doDataValue and move on
					yone = tmp;
					ytwo = tmp;
					ythree = tmp;
				}
				else
				{

2.How setup GridColorScheme when Raster output to Image,code seg as follows:
Maybe need add setup GridColorScheme code to here:
File:Utils.cpp
Function:STDMETHODIMP CUtils::GenerateHillShade(BSTR bstrGridFilename, BSTR bstrShadeFilename,
float z, float scale, float az, float alt, VARIANT_BOOL* retval)