GRASS Programmer's Manual
6.4.3(2013)-r
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gsdiff.c
Go to the documentation of this file.
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30
#include <grass/gstypes.h>
31
#include "
gsget.h
"
32
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static
geosurf *Refsurf =
NULL
;
34
static
typbuff *Refbuff =
NULL
;
35
static
float
Refscale = 1.0;
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42
void
gsdiff_set_SDscale
(
float
scale)
43
{
44
Refscale = scale;
45
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return
;
47
}
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54
float
gsdiff_get_SDscale
(
void
)
55
{
56
return
(Refscale);
57
}
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64
void
gsdiff_set_SDref
(geosurf * gsref)
65
{
66
Refsurf = gsref;
67
Refbuff =
gs_get_att_typbuff
(gsref, ATT_TOPO, 0);
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return
;
70
}
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77
geosurf *
gsdiff_get_SDref
(
void
)
78
{
79
if
(Refsurf && Refbuff) {
80
return
(Refsurf);
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}
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return
(
NULL
);
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}
85
94
float
gsdiff_do_SD
(
float
val,
int
offset)
95
{
96
float
ref;
97
98
if
(Refbuff) {
99
GET_MAPATT
(Refbuff, offset, ref);
100
return
(ref + (val - ref) * Refscale);
101
}
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return
(val);
104
}
lib
ogsf
gsdiff.c
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