Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/~mperrin/software/sources/drdpix.pro Дата изменения: Sat Apr 20 05:48:54 2002 Дата индексирования: Sat Mar 1 13:26:19 2014 Кодировка: Поисковые слова: aircraft

; $Id: drdpix.pro,v 1.1 2002/04/20 01:48:54 mperrin Exp $
;
; Copyright (c) 1989-2000, Research Systems, Inc. All rights reserved.
; Unauthorized reproduction prohibited.

Pro dRdpix, Image,X0, Y0 ;Read the value of the pixel under the cursor
;Display x,y and the pixel value under the cursor
;+
; NAME:
; DRDPIX
;
; Exactly like rdpix, except uses data coordinates rather than device
; coordinates.
;
; PURPOSE:
; Interactively display the X position, Y position, and pixel value
; of the cursor.
;
; CATEGORY:
; Image display.
;
; CALLING SEQUENCE:
; RDPIX, Image [, X0, Y0]
;
; INPUTS:
; Image: The array that represents the image being displayed. This
; array may be of any type. Rather reading pixel values from
; the display, they are taken from this parameter, avoiding
; scaling difficulties.
;
; OPTIONAL INPUT PARAMETERS:
; X0, Y0: The location of the lower-left corner of the image area on
; screen. If these parameters are not supplied, they are
; assumed to be zero.
;
; OUTPUTS:
; None.
;
; COMMON BLOCKS:
; None.
;
; SIDE EFFECTS:
; The X, Y, and value of the pixel under the cursor are continuously
; displayed.
;
; RESTRICTIONS:
; None.
;
; PROCEDURE:
; Instructions are printed and the pixel values are printed as the
; cursor is moved over the image.
;
; Press the left or center mouse button to create a new line of output,
; saving the previous line.
;
; Press the right mouse button to exit the procedure.
;
; MODIFICATION HISTORY:
; DMS, Dec, 1987.
; Rob Montgomery (rob@hao.ucar.edu), 9/21/92;
; Correct indices for case of !order = 1
; 2002-04-19 Marshall Perrin. Renamed to DRDPIX (for "display" read pix)
; and modified to use normalized coordinates.
;
;
;-

COMPILE_OPT strictarr
on_error,2 ;Return to caller if an error occurs
print,'Press left or center mouse button for new output line.'
print,'... right mouse button to exit.'
s = size(image)
if s[0] ne 2 then message, 'Image parameter not 2d.'
s[1] = s[1]-1 ;To n-1
s[2] = s[2]-1
!mouse.button=0
if n_elements(x0) le 0 then x0 = 0
if n_elements(y0) le 0 then y0 = 0
if s[s[0]+1] ge 4 then form = 'F' else form = 'I'
case !version.os_family of
'Windows': cr = string("15b)+string("12b) ; carriage and new line
'MacOS': cr = string("15b) ; carriage return
'unix': cr = string("15b) ; carriage (for BC on
; UNIX use CR rather
; than CR/LF)
else: cr = string("15b) ; carriage return"
endcase
form="($,'x=',i4,', y=',i4,', value=',"+form+",a)"
while !mouse.button ne 4 do begin
CURSOR,x,y,2
if (!mouse.button and 3) ne 0 then begin ;New line?
print,form="($,a)",string("12b) ;"
while (!mouse.button ne 0) do begin wait,.1 & CURSOR,x,y,0 & end
endif

x = x-x0 & y = y - y0
if (x le s[1]) and (y le s[2]) and (x ge 0) and (y ge 0) then begin
if (!order eq 1) then yy = s[2] - y else yy = y
print,form = form, x,y,Image[x,yy],cr
endif
endwhile
print,form="(/)"
end