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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.