96 lines
3.1 KiB
JavaScript
96 lines
3.1 KiB
JavaScript
/** \file
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* \brief Wrappers for the Ambient Light Sensor
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*
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* \see https://www.w3.org/TR/ambient-light/
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*
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* \author Copyright (C) 2021 Radek Hranicky
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*
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* \license SPDX-License-Identifier: GPL-3.0-or-later
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*/
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//
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/** \file
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* \ingroup wrappers
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* MOTIVATION
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* The AmbientLightSensor returns illuminance of the device's environment. This
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* is another value that describes the nearby physical surrounding of the device,
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* and can thus be used together with other readings for creating a unique fingerprint.
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*
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* WRAPPING
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* On examined stationary devices inside an office, the illuminance measured
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* was between 500 and 900, depending on the concrete position's light conditions.
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* All measured values were rounded to nearest 50 illuminance value.
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* The wrapper silumlates the same behavior. At start, a pseudorandom illuminance
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* value is drawn. As we simulate a stationary device, this value remains constant
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* for all AmbientLightSensor.prototype.illuminance calls.
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*
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* POSSIBLE IMPROVEMENTS
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* Simulation of changes in the illuminance.
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*/
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/*
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* Create private namespace
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*/
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(function() {
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/*
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* \brief Generates a pseudorandom faked illuminance value
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*/
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function drawIlluminance() {
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const ILLUMINANCE_MIN = 500
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const ILLUMINANCE_MAX = 900
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const ILLUMINANCE_NEAREST = 50
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var ilu = sen_prng() * (ILLUMINANCE_MAX - ILLUMINANCE_MIN) + ILLUMINANCE_MIN;
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return Math.round(ilu / ILLUMINANCE_NEAREST) * ILLUMINANCE_NEAREST;
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}
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/*
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* \brief Initialization of the illuminance;
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*/
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var init_data = `
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var illuminance = illuminance || drawIlluminance();
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`;
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var hc = sensorapi_prng_functions + drawIlluminance + init_data;
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var wrappers = [
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{
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parent_object: "AmbientLightSensor.prototype",
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parent_object_property: "illuminance",
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wrapped_objects: [],
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helping_code: hc,
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post_wrapping_code: [
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{
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code_type: "object_properties",
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parent_object: "AmbientLightSensor.prototype",
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parent_object_property: "illuminance",
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wrapped_objects: [],
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/** \brief replaces AmbientLightSensor.prototype.illuminance getter to return a faked value
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*/
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wrapped_properties: [
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{
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property_name: "get",
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property_value: `
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function() {
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return illuminance;
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}`,
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},
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],
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}
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],
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},
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]
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add_wrappers(wrappers);
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})()
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