Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.atnf.csiro.au/computing/software/gipsy/sub/pgsvp.dc2 Дата изменения: Wed Oct 31 05:16:18 2001 Дата индексирования: Fri Jan 16 00:11:55 2009 Кодировка: Поисковые слова: ngc 6781

Name: PGSVP

Purpose: set viewport (normalized device coordinates)

Category: GRAPHICS

File: pgplot.src

Author: T.J. Pearson

Use: see description below.

Description:

SUBROUTINE PGSVP (XLEFT, XRIGHT, YBOT, YTOP)
REAL XLEFT, XRIGHT, YBOT, YTOP

Change the size and position of the viewport, specifying
the viewport in normalized device coordinates. Normalized
device coordinates run from 0 to 1 in each dimension. The
viewport is the rectangle on the view surface "through"
which one views the graph. All the PG routines which plot lines
etc. plot them within the viewport, and lines are truncated at
the edge of the viewport (except for axes, labels etc drawn with
PGBOX or PGLAB). The region of world space (the coordinate
space of the graph) which is visible through the viewport is
specified by a call to PGSWIN. It is legal to request a
viewport larger than the view surface; only the part which
appears on the view surface will be plotted.

Arguments:
XLEFT (input) : x-coordinate of left hand edge of viewport, in NDC.
XRIGHT (input) : x-coordinate of right hand edge of viewport,
in NDC.
YBOT (input) : y-coordinate of bottom edge of viewport, in NDC.
YTOP (input) : y-coordinate of top edge of viewport, in NDC.

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