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/*
* Copyright (C) 2016 "IoT.bzh"
* Author Romain Forlot <romain.forlot@iot.bzh>
*
* 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.
*
*/
#define CTL_PLUGIN_MAGIC 1286576532
#include <afb/afb-binding.h>
#include <systemd/sd-event.h>
#include <json-c/json_object.h>
#include <math.h>
#include "signal-composer.hpp"
extern "C"
{
CTLP_CAPI_REGISTER("gps");
CTLP_CAPI (getHeading, source, argsJ, eventJ) {
static bool coordUpdated = true;
static double prvLat = 0, prvLon = 0, curLat = 0, curLon = 0, heading = 0;
double r2d = 180.0 / M_PI;
double d2r = M_PI / 180.0;
int err = 0;
struct signalCBT* ctx = (struct signalCBT*)source->context;
json_object *val = NULL, *lastSignal = NULL, *id = NULL;
lastSignal = json_object_array_get_idx(eventJ, json_object_array_length(eventJ) -1);
if(json_object_object_get_ex(lastSignal, "uid", &id) && std::string(json_object_get_string(id)) == "latitude" &&
json_object_object_get_ex(lastSignal, "value", &val)) {
prvLat = curLat;
curLat = json_object_get_double(val);
coordUpdated = !coordUpdated;
}
if(json_object_object_get_ex(lastSignal, "uid", &id) &&
std::string(json_object_get_string(id)) == "longitude" &&
json_object_object_get_ex(lastSignal, "value", &val)) {
prvLon = curLon;
curLon = json_object_get_double(val);
coordUpdated = !coordUpdated;
}
if(coordUpdated) {
heading = round(r2d * atan2((curLon - prvLon) * cos(d2r * curLat), curLat - prvLat));
ctx->setSignalValue(ctx->aSignal, 0, heading);
}
AFB_NOTICE("======== Heading: %f", heading);
return err;
}
// extern "C" closure
}
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