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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <ctotok.h>
include <ctype.h>
include <gki.h>
include "../lib/ids.h"
# WINDOW -- window the display.
procedure window()
char token[SZ_LINE]
int tok, cnum
short frames[IDS_MAXIMPL+2] # frames, graphics, EOD
short colors[IDS_MAXGCOLOR]
real x, y
real xold, yold
int device, button, cv_rdbut()
short wdata[16]
int n, first, last
real istart, iend, slope
include "cv.com"
begin
# Find out if want to change output tables
call gargtok (tok, token, SZ_LINE)
call strlwr (token)
if (( tok == TOK_IDENTIFIER) && (token[1] == 'o')) {
device = IDS_OUTPUT_LUT
slope = 4.0 # Device dependent !!
} else {
device = IDS_FRAME_LUT
slope = 1.0
# reset input pointers; same as having pushed back token
call reset_scan
call gargtok (tok, token, SZ_LINE)
}
# Default to all frames, all colors
frames[1] = IDS_EOD
colors[1] = IDS_EOD
# which frames to window
repeat {
call gargtok (tok, token, SZ_LINE)
call strlwr (token)
if (tok == TOK_IDENTIFIER) {
if (token[1] == 'f') {
call cv_frame (token[2], frames)
if (frames[1] == ERR)
return
} else if (token[1] == 'c') {
call cv_color (token[2], colors)
if (colors[1] == ERR)
return
} else {
call eprintf ("Unknown window argument: %s\n")
call pargstr (token)
return
}
} else if (tok == TOK_NUMBER) {
call cv_frame (token[1], frames)
if (frames[1] == ERR)
return
} else if (tok != TOK_NEWLINE) {
call eprintf ("Unexpected window input: %s\n")
call pargstr (token)
return
}
} until ( tok == TOK_NEWLINE)
# rememeber current cursor postion
cnum = 0
call cv_rcur (cnum, xold, yold)
# Now set up loop to window display; we need to read back
# display but cannot, so for now, use "common" variables
# If first time, use defaults.
if (cv_xwinc == -1) {
if (slope == 1.0) {
cv_xwinc = 0.25
cv_ywinc = .75
} else {
cv_xwinc = .0625
cv_ywinc = .9375
}
}
call cv_scraw (cv_xwinc, cv_ywinc)
button = cv_rdbut() # clear buttons by reading them
call eprintf ("Press any button when done\n")
# The mapping equation is table value = 0.25 + y * (i-x)
# where i runs from 0 to 1.0, x ranges from 0. to 1.0 and y
# from 0 to large.
repeat {
call cv_rcraw (cv_xwinc, cv_ywinc)
x = cv_xwinc
y = (cv_ywinc - 0.5) * 4
# Keep y from equalling 2 or -2 :
if (y >= 2.)
y = 1.99
else if ( y <= -2.0)
y = -1.99
if (y > 1.)
y = 1. / (2. - y)
else if (y < -1.)
y = -1. / (2. + y)
if ( y == 0.0) {
iend = 1.0
istart = 0.0
first = 0
last = GKI_MAXNDC
} else if ( y > 0.) {
istart = x - 0.25/y
iend = 1.0/y + istart
first = 0
last = GKI_MAXNDC
} else {
iend = x - 0.25/y
istart = 1.0/y + iend
first = GKI_MAXNDC
last = 0
}
if (istart < 0.)
istart = 0.
if (iend > 1.0)
iend = 1.0
if (istart > 1.0)
istart = 1.0
if (iend < istart)
iend = istart
wdata[1] = 0
if ( istart > 0.) {
wdata[2] = first
wdata[3] = istart * GKI_MAXNDC
wdata[4] = first
n = 5
} else {
wdata[2] = (0.25 -x*y) * GKI_MAXNDC
n = 3
}
wdata[n] = iend * GKI_MAXNDC
if ( iend < 1.0) {
# In this case, we reach max/min y value before end of table, so
# extend it horizontally to end
wdata[n+1] = last
wdata[n+2] = GKI_MAXNDC
wdata[n+3] = last
n = n + 3
} else {
wdata[n+1] = (0.25 + y * (1.0 - x)) * GKI_MAXNDC
n = n + 1
}
call cvwlut (device, frames, colors, wdata, n)
button = cv_rdbut()
} until (button > 0)
# Restore old cursor position
call cv_rcur (cnum, xold, yold)
# Tell the user what final mapping was
call printf ("window: from (%5.3f,%5.3f) to (%5.3f,%5.3f)\n")
call pargr (istart)
if (istart > 0.)
call pargr (real(first)/GKI_MAXNDC)
else
call pargr (real(wdata[2])/GKI_MAXNDC)
call pargr (iend)
if (iend < 1.0)
call pargr (real(last)/GKI_MAXNDC)
else
call pargr (real(wdata[n])/GKI_MAXNDC)
end
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