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/******************************************************************************
*
* Copyright (C) 2012 Asahi Kasei Microdevices Corporation, Japan
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
#include "AKFS_Device.h"
#include "AKFS_VNorm.h"
/******************************************************************************/
/*! Normalize vector.
@return #AKFS_SUCCESS on success. Otherwise the return value is #AKFS_ERROR.
@param[in] ndata Size of raw vector buffer
@param[in] vdata Raw vector buffer
@param[in] nbuf Size of data to be buffered
@param[in] o Offset
@param[in] s Sensitivity
@param[in] tgt Target sensitivity
@param[in] nvec Size of normalized vector buffer
@param[out] vvec Normalized vector buffer
*/
int16 AKFS_VbNorm(
const int16 ndata,
const AKFVEC vdata[],
const int16 nbuf,
const AKFVEC *o,
const AKFVEC *s,
const AKFLOAT tgt,
const int16 nvec,
AKFVEC vvec[]
)
{
int i;
/* size check */
if ((ndata <= 0) || (nvec <= 0) || (nbuf <= 0)) {
return AKFS_ERROR;
}
/* dependency check */
if ((nbuf < 1) || (ndata < nbuf) || (nvec < nbuf)) {
return AKFS_ERROR;
}
/* sensitivity check */
if ((s->u.x <= AKFS_EPSILON) ||
(s->u.y <= AKFS_EPSILON) ||
(s->u.z <= AKFS_EPSILON) ||
(tgt <= 0)) {
return AKFS_ERROR;
}
/* calculate and store data to buffer */
if (AKFS_BufShift(nvec, nbuf, vvec) != AKFS_SUCCESS) {
return AKFS_ERROR;
}
for (i = 0; i < nbuf; i++) {
vvec[i].u.x = ((vdata[i].u.x - o->u.x) / (s->u.x) * (AKFLOAT)tgt);
vvec[i].u.y = ((vdata[i].u.y - o->u.y) / (s->u.y) * (AKFLOAT)tgt);
vvec[i].u.z = ((vdata[i].u.z - o->u.z) / (s->u.z) * (AKFLOAT)tgt);
}
return AKFS_SUCCESS;
}
/******************************************************************************/
/*! Calculate an averaged vector form a given buffer.
@return #AKFS_SUCCESS on success. Otherwise the return value is #AKFS_ERROR.
@param[in] nvec Size of normalized vector buffer
@param[in] vvec Normalized vector buffer
@param[in] nave Number of average
@param[out] vave Averaged vector
*/
int16 AKFS_VbAve(
const int16 nvec,
const AKFVEC vvec[],
const int16 nave,
AKFVEC *vave
)
{
int i;
/* arguments check */
if ((nave <= 0) || (nvec <= 0) || (nvec < nave)) {
return AKFS_ERROR;
}
/* calculate average */
vave->u.x = 0;
vave->u.y = 0;
vave->u.z = 0;
for (i = 0; i < nave; i++) {
if ((vvec[i].u.x == AKFS_INIT_VALUE_F) ||
(vvec[i].u.y == AKFS_INIT_VALUE_F) ||
(vvec[i].u.z == AKFS_INIT_VALUE_F)) {
break;
}
vave->u.x += vvec[i].u.x;
vave->u.y += vvec[i].u.y;
vave->u.z += vvec[i].u.z;
}
if (i == 0) {
vave->u.x = 0;
vave->u.y = 0;
vave->u.z = 0;
} else {
vave->u.x /= i;
vave->u.y /= i;
vave->u.z /= i;
}
return AKFS_SUCCESS;
}
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