Name: GRSCR Purpose: set color representation Category: GRAPHICS File: pgplot.src Author: T.J. Pearson Use: see description below. Description: SUBROUTINE GRSCR (CI, CR, CG, CB) INTEGER CI REAL CR, CG, CB GRPCKG: SET COLOUR REPRESENTATION -- define the colour to be associated with a colour index. Ignored for devices which do not support variable colour or intensity. On monochrome output devices (e.g. VT125 terminals with monochrome monitors), the monochrome intensity is computed from the specified Red, Green, Blue intensities as 0.30*R + 0.59*G + 0.11*B, as in US color television systems, NTSC encoding. Note that most devices do not have an infinite range of colours or monochrome intensities available; the nearest available colour is used. Arguments: CI (integer, input): colour index. If the colour index is outside the range available on the device, the call is ignored. Colour index 0 applies to the background colour. CR, CG, CB (real, input): red, green, and blue intensities, in range 0.0 to 1.0. Updates: Oct 16, 1998: JPT automatically extracted from source.