Name:         PGSHS

Purpose:      set hatching style

Category:     GRAPHICS

File:         pgplot.src

Author:       T.J. Pearson

Use:          see description below.

Description:

            SUBROUTINE PGSHS (ANGLE, SEPN, PHASE)
            REAL ANGLE, SEPN, PHASE
      
       Set the style to be used for hatching (fill area with fill-style 3).
       The default style is ANGLE=45.0, SEPN=1.0, PHASE=0.0.
      
       Arguments:
        ANGLE  (input)  : the angle the hatch lines make with the
                          horizontal, in degrees, increasing 
                          counterclockwise (this is an angle on the
                          view surface, not in world-coordinate space).
        SEPN   (input)  : the spacing of the hatch lines. The unit spacing
                          is 1 percent of the smaller of the height or
                          width of the view surface. This should not be
                          zero.
        PHASE  (input)  : a real number between 0 and 1; the hatch lines
                          are displaced by this fraction of SEPN from a
                          fixed reference.  Adjacent regions hatched with the
                          same PHASE have contiguous hatch lines. To hatch
                          a region with alternating lines of two colors,
                          fill the area twice, with PHASE=0.0 for one color
                          and PHASE=0.5 for the other color.

Updates:      Oct 16, 1998: JPT automatically extracted from source.