home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
SGI Hot Mix 17
/
Hot Mix 17.iso
/
HM17_SGI
/
research
/
lib
/
obsolete
/
set_viewport.pro
< prev
next >
Wrap
Text File
|
1997-07-08
|
2KB
|
74 lines
; $Id: set_viewport.pro,v 1.2 1997/01/15 04:02:19 ali Exp $
;
; Copyright (c) 1989-1997, Research Systems, Inc. All rights reserved.
; Unauthorized reproduction prohibited.
pro set_viewport, xmin, xmax, ymin, ymax
;+
; NAME:
; SET_VIEWPORT
;
; PURPOSE:
; Emulate the Version I, VMS/IDL SET_VIEWPORT procedure.
; Sets the default position and size of the plot data window.
;
; CATEGORY:
; Plotting.
;
; CALLING SEQUENCE:
; SET_VIEWPORT, Xmin, Xmax [, Ymin, Ymax]
;
; INPUTS:
; Xmin: Minimum X normalized coordinate of the plotting data window.
;
; Xmax: Maximum X normalized coordinate of the plotting data window.
;
; OPTIONAL INPUT PARAMETERS:
; Ymin: Minimum Y normalized coordinate of the plotting data window.
;
; Ymax: Maximum Y normalized coordinate of the plotting data window.
;
; KEYWORD PARAMETERS:
; None.
;
; OUTPUTS:
; No explicit outputs.
;
; COMMON BLOCKS:
; None.
;
; SIDE EFFECTS:
; Sets !P.POSITION.
;
; RESTRICTIONS:
; None.
;
; PROCEDURE:
; Straightforward. !P.POSITION is directly set.
;
; MODIFICATION HISTORY:
; DMS, June, 1989.
;
; Modified, April, 1991 to restore defaults if called with no
; parameters.
;-
on_error,2 ;Return to caller if an error occurs
n = n_params()
if n_elements(xmin) eq 0 then xmin = 0.
if n_elements(xmax) eq 0 then xmax = 0.
IF xmin eq xmax then begin ;Set defaults?
!x.margin = [10,3]
!y.margin = [4,2]
!p.position = 0
return
ENDIF
IF n le 2 then begin ;Calculate Ymin and Ymax
y = !x.margin * !d.x_ch_size / !d.x_size ;Margins in normalized coords
ymin = y(0)
ymax = 1.0 - y(1)
ENDIF
!p.position = [ xmin, ymin, xmax, ymax] ;Set it
end