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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <imhdr.h>
include <ctype.h>
include <mach.h>
include "imexam.h"
# IE_GCUR -- Get IMEXAM cursor value.
# This is an interface between the standard cursor input and IMEXAM.
# It reads the appropriate cursor, determines the image index or frame
# type, makes the appropriate default coordinate conversions when using
# graphics cursor input, and gets any further cursor reads needed.
# Missing coordinates default to the last coordinates.
int procedure ie_gcur (ie, curtype, x, y, key, strval, maxch)
pointer ie #I IMEXAM structure
int curtype #I cursor type (0=image, 1=graphics, 2=text)
real x, y #O cursor position
int key #O keystroke value of cursor event
char strval[ARB] #O string value, if any
int maxch #I max chars out
char ch
real x1, y1, x2, y2, dx, dy, r, cosa, sina
int temp, k[2], nitems, wcs, ip, i
bool streq()
char clgetc()
int clgcur(), imd_gcur(), ctor(), cctoc()
errchk clgcur, imd_gcur
begin
# Save last cursor value.
x1 = x; y1 = y
strval[1] = EOS
k[1] = clgetc ("defkey")
# Get one or more cursor values from the desired cursor parameter.
# Check for missing coordinates and substitute the last value.
do i = 1, 2 {
switch (curtype) {
case 'i':
nitems = imd_gcur ("imagecur", x, y, wcs, k[i], strval, maxch)
if (IS_INDEF(x))
x = x1
if (IS_INDEF(y))
y = y1
IE_NEWFRAME(ie) = wcs
if (IE_DFRAME(ie) <= 0)
IE_DFRAME(ie) = IE_NEWFRAME(ie)
case 'g':
nitems = clgcur ("graphcur", x, y, wcs, k[i], strval, maxch)
# Make any needed default coordinate conversions from the
# graphic coordinates.
switch (IE_GTYPE(ie)) {
case 'c', 'k': # Column plot
y = x
x = IE_X1(ie)
if (IS_INDEF(y))
y = y1
else if (IE_MW(ie) != NULL) {
if (streq (IE_WCSNAME(ie), "logical"))
;
else if (streq (IE_WCSNAME(ie), "physical"))
call ie_imwctran (ie, x, y, dx, y)
else {
r = y
y = IM_LEN(IE_IM(ie),2)
call ie_mwctran (ie, x, 1., dx, y1)
call ie_mwctran (ie, x, y, dx, y2)
dy = y
while (dy > .001) {
dy = dy / 2
if (r > y1) {
if (r < y2)
y = y - dy
else
y = y + dy
} else {
if (r < y2)
y = y + dy
else
y = y - dy
}
call ie_mwctran (ie, x, y, dx, y2)
}
}
}
case 'e': # Contour plot
if (IS_INDEF(x))
x = x1
if (IS_INDEF(y))
y = y1
case 'j', 'l': # Line plot
y = IE_Y1(ie)
if (IS_INDEF(x))
x = x1
else if (IE_MW(ie) != NULL) {
if (streq (IE_WCSNAME(ie), "logical"))
;
else if (streq (IE_WCSNAME(ie), "physical"))
call ie_imwctran (ie, x, y, x, dy)
else {
r = x
x = IM_LEN(IE_IM(ie),1)
call ie_mwctran (ie, 1., y, x1, dy)
call ie_mwctran (ie, x, y, x2, dy)
dx = x
while (dx > .001) {
dx = dx / 2
if (r > x1) {
if (r < x2)
x = x - dx
else
x = x + dx
} else {
if (r < x2)
x = x + dx
else
x = x - dx
}
call ie_mwctran (ie, x, y, x2, dy)
}
}
}
case 'r','.': # Radial profile plot
x = IE_X1(ie)
y = IE_Y1(ie)
case 'h', 's': # Surface plot
x = IE_X1(ie)
y = IE_Y1(ie)
case 'u': # Vector plot
if (IS_INDEF(x))
x = x1
y = x * sina + (IE_Y1(ie) + IE_Y2(ie)) / 2
x = x * cosa + (IE_X1(ie) + IE_X2(ie)) / 2
case 'v': # Vector plot
if (IS_INDEF(x))
x = x1
y = x * sina + IE_Y1(ie)
x = x * cosa + IE_X1(ie)
}
}
key = k[1]
switch (key) {
case 'v', 'u':
if (i == 1) {
x1 = x
y1 = y
call printf ("again:")
} else {
x2 = x
y2 = y
r = sqrt (real ((y2-y1)**2 + (x2-x1)**2))
if (r > 0.) {
cosa = (x2 - x1) / r
sina = (y2 - y1) / r
} else {
cosa = 0.
sina = 0.
}
call printf ("\n")
switch (key) {
case 'v':
x = x1
y = y1
case 'u':
x = 2 * x1 - x2
y = 2 * y1 - y2
}
IE_X2(ie) = x2
IE_Y2(ie) = y2
break
}
case 'b':
if (i == 1) {
IE_IX1(ie) = x + 0.5
IE_IY1(ie) = y + 0.5
call printf ("again:")
} else {
IE_IX2(ie) = x + 0.5
IE_IY2(ie) = y + 0.5
call printf ("\n")
temp = IE_IX1(ie)
IE_IX1(ie) = min (IE_IX1(ie), IE_IX2(ie))
IE_IX2(ie) = max (temp, IE_IX2(ie))
temp = IE_IY1(ie)
IE_IY1(ie) = min (IE_IY1(ie), IE_IY2(ie))
IE_IY2(ie) = max (temp, IE_IY2(ie))
break
}
default:
break
}
}
# Map numeric colon sequences (: x [y] key strval) to make them appear
# as ordinary "x y key" type cursor reads. This makes it possible for
# the user to access any command using typed in rather than positional
# cursor coordinates. Special treatment is also given to the syntax
# ":lN" and ":cN", provided for compatibility with IMPLOT for simple
# line and column plots.
if (key == ':') {
for (ip=1; IS_WHITE(strval[ip]); ip=ip+1)
;
if (IS_DIGIT(strval[ip])) {
if (ctor (strval, ip, x) <= 0)
;
if (ctor (strval, ip, y) <= 0)
y = x
for (; IS_WHITE(strval[ip]); ip=ip+1)
;
if (cctoc (strval, ip, ch) > 0)
key = ch
call strcpy (strval[ip], strval, maxch)
} else if (strval[ip] == 'l' && IS_DIGIT(strval[ip+1])) {
ip = ip + 1
if (ctor (strval, ip, x) > 0) {
y = x
key = 'l'
}
} else if (strval[ip] == 'c' && IS_DIGIT(strval[ip+1])) {
ip = ip + 1
if (ctor (strval, ip, x) > 0) {
y = x
key = 'c'
}
}
}
return (nitems)
end
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