1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
include <mach.h>
include <pkg/gtools.h>
# ING_NEAREST -- Find the nearest point to the cursor and return the index.
# The cursor is moved to the nearest point selected.
int procedure ing_nearestd (in, gp, gt, nl, x, y, npts, nvars, wx, wy)
pointer in # INLFIT pointer
pointer gp # GIO pointer
pointer gt # GTOOLS pointer
pointer nl # NLFIT pointer
double x[ARB] # Independent variables (npts * nvars)
double y[npts] # Dependent variables
int npts # Number of points
int nvars # Number of variables
real wx, wy # Cursor position
int pt
pointer sp, xout, yout
int ing_nd(), gt_geti()
begin
# Allocate memory for axes data
call smark (sp)
call salloc (xout, npts, TY_DOUBLE)
call salloc (yout, npts, TY_DOUBLE)
# Set axes data
call ing_axesd (in, gt, nl, 1, x, y, Memd[xout], npts, nvars)
call ing_axesd (in, gt, nl, 2, x, y, Memd[yout], npts, nvars)
# Check for transposed axes
if (gt_geti (gt, GTTRANSPOSE) == NO)
pt = ing_nd (gp, Memd[xout], Memd[yout], npts, wx, wy)
else
pt = ing_nd (gp, Memd[yout], Memd[xout], npts, wy, wx)
call sfree (sp)
# Return index
return (pt)
end
# ING_N -- Find position and move the cursor.
int procedure ing_nd (gp, x, y, npts, wx, wy)
pointer gp # GIO pointer
double x[npts], y[npts] # Data points
int npts # Number of points
real wx, wy # Cursor position
int i, j
real xc, yc, x0, y0, r2, r2min
begin
# Transform world cursor coordinates to NDC.
call gctran (gp, wx, wy, xc, yc, 1, 0)
# Search for nearest point.
r2min = MAX_REAL
do i = 1, npts {
call gctran (gp, real (x[i]), real (y[i]), x0, y0, 1, 0)
r2 = (x0 - xc) ** 2 + (y0 - yc) ** 2
if (r2 < r2min) {
r2min = r2
j = i
}
}
# Move the cursor to the selected point and return the index.
if (j != 0) {
call gscur (gp, real (x[j]), real (y[j]))
wx = x[j]
wy = y[j]
}
return (j)
end
|
