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include <gset.h>
include <mach.h>
include <pkg/gtools.h>
define MSIZE 2.0 # Mark size (real)
# ING_DELETE -- Delete data point nearest the cursor.
# The nearest point to the cursor in NDC coordinates is determined.
procedure ing_delete$t (in, gp, gt, nl, x, y, wts, npts, nvars, wx, wy)
pointer in # INLFIT pointer
pointer gp # GIO pointer
pointer gt # GTOOLS pointer
pointer nl # NLFIT pointer
PIXEL x[ARB] # Independent variables (npts * nvars)
PIXEL y[npts] # Dependent variables
PIXEL wts[npts] # Weight array
int npts # Number of points
int nvars # Number of variables
real wx, wy # Position to be nearest
int gt_geti()
pointer sp, xout, yout
begin
# Allocate memory for axes data
call smark (sp)
call salloc (xout, npts, TY_PIXEL)
call salloc (yout, npts, TY_PIXEL)
# Get axes data
call ing_axes$t (in, gt, nl, 1, x, y, Mem$t[xout], npts, nvars)
call ing_axes$t (in, gt, nl, 2, x, y, Mem$t[yout], npts, nvars)
# Transpose axes if necessary
if (gt_geti (gt, GTTRANSPOSE) == NO)
call ing_d1$t (in, gp, Mem$t[xout], Mem$t[yout], wts, npts, wx, wy)
else
call ing_d1$t (in, gp, Mem$t[yout], Mem$t[xout], wts, npts, wy, wx)
# Free memory
call sfree (sp)
end
# ING_D1 -- Do the actual delete. Mark deleted point with zero weigth.
procedure ing_d1$t (in, gp, x, y, wts, npts, wx, wy)
pointer in # ICFIT pointer
pointer gp # GIO pointer
PIXEL x[npts], y[npts] # Data points
PIXEL wts[npts] # Weight array
int npts # Number of points
real wx, wy # Position to be nearest
int i, j
real x0, y0, r2, r2min
begin
# Transform world cursor coordinates to NDC.
call gctran (gp, wx, wy, wx, wy, 1, 0)
# Search for nearest point to a point with non-zero weight.
r2min = MAX_REAL
do i = 1, npts {
if (wts[i] == PIXEL (0.0))
next
call gctran (gp, real (x[i]), real (y[i]), x0, y0, 1, 0)
r2 = (x0 - wx) ** 2 + (y0 - wy) ** 2
if (r2 < r2min) {
r2min = r2
j = i
}
}
# Mark the deleted point with a cross and set the weight to zero.
if (j != 0) {
call gscur (gp, real (x[j]), real (y[j]))
call gmark (gp, real (x[j]), real (y[j]), GM_CROSS, MSIZE, MSIZE)
wts[j] = PIXEL (0.0)
}
end
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