/src/samples/flow/tilt-angle/arctan-node.c

/*
 * This file is part of the Soletta (TM) Project
 *
 * Copyright (C) 2016 Intel Corporation. All rights reserved.
 *
 * 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 <errno.h>
#include <stdio.h>
#include <math.h>

#include <sol-log.h>
#include <sol-mainloop.h>
#include <sol-flow.h>

static int
logic_process(struct sol_flow_node *node, void *data, uint16_t port,
              uint16_t conn_id, const struct sol_flow_packet *packet);

/* This file is generated using sol-flow-node-type-gen.py, see above */
#include "arctan-spec-gen.c"

static int
logic_process(struct sol_flow_node *node, void *data, uint16_t port,
              uint16_t conn_id, const struct sol_flow_packet *packet)
{
    int r;
    struct sol_drange d_value;
    double arctan = 0;

    r = sol_flow_packet_get_drange(packet, &d_value);
    SOL_INT_CHECK(r, < 0, r);

    /*
     * atan() is a fuction in math.h library to calculate the
     * value of arctangent in radian
     */
    if (isfinite(d_value.val)) {
        arctan = atan(d_value.val) * 180 / M_PI;
    } else {
        arctan = 90;
    }

    r = sol_flow_send_drange_value_packet(node,
                                          SOL_FLOW_NODE_TYPE_ARCTANGENT_LOGIC__OUT__OUT,
                                          arctan);
    SOL_INT_CHECK(r, < 0, r);

    return 0;
}