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include <mach.h>
include <gset.h>
include <pkg/gtools.h>
# AUTO_EXP -- Auto expand around the marked region
procedure auto_exp (gp, gt, key, wx1, x, y, n)
pointer gp # GIO pointer
pointer gt # GTOOLS pointer
int key # Key
real wx1 # Cursor position
real x[n] # Pixel coordinates
real y[n] # Pixel data for Y scaling
int n # Number of pixels
char cmd[1]
int i, wcs
real x1, x2, y1, y2, wx2, wy, dx, xmin, xmax, ymin, ymax
int clgcur()
begin
# Get the current window.
call ggwind (gp, x1, x2, y1, y2)
# Compute the new window in x.
dx = x2 - x1
switch (key) {
case 'a': # Expand
call printf ("again:\n")
i = clgcur ("cursor", wx2, wy, wcs, key, cmd, SZ_LINE)
x1 = wx1
x2 = wx2
case ',': # Shift left
x1 = x1 - 0.85 * dx
x2 = x2 - 0.85 * dx
case '.': # Shift right
x1 = x1 + 0.85 * dx
x2 = x2 + 0.85 * dx
case 'z': # Zoom x axis
x1 = x1 + 0.25 * dx
x2 = x2 - 0.25 * dx
}
if (x1 == x2) {
# Autoscale.
x1 = INDEF
x2 = INDEF
ymin = INDEF
ymax = INDEF
} else {
# Determine the y limits for pixels between x1 and x2.
xmin = min (x1, x2)
xmax = max (x1, x2)
ymin = MAX_REAL
ymax = -MAX_REAL
do i = 1, n {
if (x[i] < xmin || x[i] > xmax)
next
ymin = min (y[i], ymin)
ymax = max (y[i], ymax)
}
if (ymin > ymax) {
ymin = y1
ymax = y2
} else if (y1 > y2) {
y1 = ymin
ymin = ymax
ymax = y1
}
}
call gt_setr (gt, GTXMIN, x1)
call gt_setr (gt, GTXMAX, x2)
call gt_setr (gt, GTYMIN, ymin)
call gt_setr (gt, GTYMAX, ymax)
call replot (gp, gt, x, y, n, YES)
end
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