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xround.c
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#include <limits.h>
#include <math.h>
#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/calc.h>
/**********************************************************************
round(x, step, start)
rounds x to nearest value in the sequence
y[i] = i * step + start
**********************************************************************/
/* i_round(x) rounds x to nearest value, handles negative correctly */
static double i_round(double x, double step, double start)
{
x -= start;
x /= step;
x = floor(x + 0.5);
x *= step;
x += start;
return x;
}
/**********************************************************************/
int f_round(int argc, const int *argt, void **args)
{
const DCELL *arg1 = args[1];
int i;
if (argc < 1)
return E_ARG_LO;
if (argc > 3)
return E_ARG_HI;
if (argc == 1 && argt[0] != CELL_TYPE)
return E_RES_TYPE;
if (argt[1] != DCELL_TYPE)
return E_ARG_TYPE;
if (argc > 1 && argt[2] != DCELL_TYPE)
return E_ARG_TYPE;
if (argc > 2 && argt[3] != DCELL_TYPE)
return E_ARG_TYPE;
if (argc == 1) {
CELL *res = args[0];
for (i = 0; i < columns; i++) {
if (IS_NULL_D(&arg1[i]))
SET_NULL_C(&res[i]);
else {
DCELL x = i_round(arg1[i], 1.0, 0.0);
if (x > 2147483647.0 || x < -2147483647.0)
SET_NULL_C(&res[i]);
else
res[i] = (CELL)x;
}
}
return 0;
}
else if (argc == 2) {
const DCELL *arg2 = args[2];
switch (argt[0]) {
case CELL_TYPE: {
CELL *res = args[0];
for (i = 0; i < columns; i++) {
if (IS_NULL_D(&arg1[i]))
SET_NULL_C(&res[i]);
else if (IS_NULL_D(&arg2[i]))
SET_NULL_C(&res[i]);
else {
DCELL x = i_round(arg1[i], arg2[i], 0.0);
if (x > 2147483647.0 || x < -2147483647.0)
SET_NULL_C(&res[i]);
else
res[i] = (CELL)x;
}
}
return 0;
}
case FCELL_TYPE: {
FCELL *res = args[0];
for (i = 0; i < columns; i++)
if (IS_NULL_D(&arg1[i]))
SET_NULL_F(&res[i]);
else if (IS_NULL_D(&arg2[i]))
SET_NULL_F(&res[i]);
else
res[i] = (FCELL)i_round(arg1[i], arg2[i], 0.0);
return 0;
}
case DCELL_TYPE: {
DCELL *res = args[0];
for (i = 0; i < columns; i++)
if (IS_NULL_D(&arg1[i]))
SET_NULL_D(&res[i]);
else if (IS_NULL_D(&arg2[i]))
SET_NULL_D(&res[i]);
else
res[i] = (DCELL)i_round(arg1[i], arg2[i], 0.0);
return 0;
}
default:
return E_INV_TYPE;
}
}
else if (argc == 3) {
const DCELL *arg2 = args[2];
const DCELL *arg3 = args[3];
switch (argt[0]) {
case CELL_TYPE: {
CELL *res = args[0];
for (i = 0; i < columns; i++) {
if (IS_NULL_D(&arg1[i]))
SET_NULL_C(&res[i]);
else if (IS_NULL_D(&arg2[i]))
SET_NULL_C(&res[i]);
else if (IS_NULL_D(&arg3[i]))
SET_NULL_C(&res[i]);
else {
DCELL x = i_round(arg1[i], arg2[i], arg3[i]);
if (x > 2147483647.0 || x < -2147483647.0)
SET_NULL_C(&res[i]);
else
res[i] = (CELL)x;
}
}
return 0;
}
case FCELL_TYPE: {
FCELL *res = args[0];
for (i = 0; i < columns; i++)
if (IS_NULL_D(&arg1[i]))
SET_NULL_F(&res[i]);
else if (IS_NULL_D(&arg2[i]))
SET_NULL_F(&res[i]);
else if (IS_NULL_D(&arg3[i]))
SET_NULL_F(&res[i]);
else
res[i] = (FCELL)i_round(arg1[i], arg2[i], arg3[i]);
return 0;
}
case DCELL_TYPE: {
DCELL *res = args[0];
for (i = 0; i < columns; i++)
if (IS_NULL_D(&arg1[i]))
SET_NULL_D(&res[i]);
else if (IS_NULL_D(&arg2[i]))
SET_NULL_D(&res[i]);
else if (IS_NULL_D(&arg3[i]))
SET_NULL_D(&res[i]);
else
res[i] = (DCELL)i_round(arg1[i], arg2[i], arg3[i]);
return 0;
}
default:
return E_INV_TYPE;
}
}
else
return E_WTF;
}
int c_round(int argc, int *argt)
{
if (argc < 1)
return E_ARG_LO;
if (argc > 3)
return E_ARG_HI;
argt[0] = CELL_TYPE;
if (argc > 1 && argt[0] < argt[2])
argt[0] = argt[2];
if (argc > 2 && argt[0] < argt[3])
argt[0] = argt[3];
argt[1] = DCELL_TYPE;
if (argc > 1)
argt[2] = DCELL_TYPE;
if (argc > 2)
argt[3] = DCELL_TYPE;
return 0;
}
columns
int columns
Definition calc.c:11
x
#define x
c_round
int c_round(int argc, int *argt)
Definition xround.c:176
f_round
int f_round(int argc, const int *argt, void **args)
Definition xround.c:30