Obtain the RGB color value from an AcDbEntity using ObjectARX and RealDWG

by Fenton Webb

Here’s how to obtain the RGB value from an already AcDb::kOpenForRead AcDbEntity.

static COLORREF GetRGBFromEntity( AcDbEntity *ent )

{

  COLORREF colorRef = RGB(255, 255, 255);

  AcCmColor Color = ent->color();

  AcCmEntityColor::ColorMethod ColorMethod = Color.colorMethod();

 

  switch(ColorMethod)

  {

  case AcCmEntityColor::kByACI:

    {         

      long acirgb, r,g,b;

      acirgb = AcCmEntityColor::lookUpRGB(Color.colorIndex());

 

      b = ( acirgb & 0xff00L );

      g = ( acirgb & 0xff00L ) >> 8;

      r = acirgb >> 16;

 

      colorRef = RGB( r, g, b); 

      break;

 

    }

  }

  return colorRef;

}