722 lines
23 KiB
JavaScript
722 lines
23 KiB
JavaScript
var audioContext;
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var sendButton;
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var textToSend;
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var isListeningCheckbox;
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var samplesPerBitLabel;
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var microphoneStream;
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var microphoneNode;
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var analyser;
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var receivedDataTextarea;
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var sentDataTextArea;
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var receivedGraph;
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var receivedData = [];
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var MAX_BITS_DISPLAYED_ON_GRAPH = 9;
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var MAX_DATA = 300;
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var pauseTimeoutId;
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var sampleIntervalId;
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// 20 to 20,000 - human
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var TEXT_TO_SEND = "Hello World!";
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var MINIMUM_FREQUENCY = 5000;
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var MAXIMUM_FREQUENCY = 10000;
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var FREQUENCY_DURATION = 60;
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var FREQUENCY_THRESHOLD_PERCENT = .75;
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var FREQUENCY_THRESHOLD = 150;
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var FREQUENCY_RESOLUTION_MULTIPLIER = 2;
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var SAMPLE_DELAY_MS = 1;
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var FFT_POWER = 10;
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var LAST_BIT_PERCENT = 0.8;
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var SMOOTHING_TIME_CONSTANT = 0;
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var frequencyOverTime = [];
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var bitStart = [];
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var samplesPerBit = [];
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var bitSampleCount = 0;
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var PAUSE = false;
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var PAUSE_AFTER_END = true;
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var PACKET_SIZE_BITS = 10;
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const packetBits = [];
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let packetDataByteCount = -1;
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function handleWindowLoad() {
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// grab dom elements
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sendButton = document.getElementById('send-button');
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isListeningCheckbox = document.getElementById('is-listening-checkbox');
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receivedDataTextarea = document.getElementById('received-data');
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receivedGraph = document.getElementById('received-graph');
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textToSend = document.getElementById('text-to-send');
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textToSend.value = TEXT_TO_SEND;
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sentDataTextArea = document.getElementById('sent-data');
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samplesPerBitLabel = document.getElementById('samples-per-bit');
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document.getElementById('pause-after-end').checked = PAUSE_AFTER_END;
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document.getElementById('pause-after-end').addEventListener('change', event => {
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PAUSE_AFTER_END = event.target.checked;
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if(!PAUSE_AFTER_END) resumeGraph();
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})
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document.getElementById('frequency-resolution-multiplier').value = FREQUENCY_RESOLUTION_MULTIPLIER;
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document.getElementById('frequency-resolution-multiplier').addEventListener('input', event => {
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FREQUENCY_RESOLUTION_MULTIPLIER = parseInt(event.target.value);
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showSpeed();
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})
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document.getElementById('bit-duration-text').addEventListener('input', (event) => {
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FREQUENCY_DURATION = parseInt(event.target.value);
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bitSampleCount = 0;
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samplesPerBit.length = 0;
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showSpeed();
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});
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document.getElementById('max-bits-displayed-on-graph').value= MAX_BITS_DISPLAYED_ON_GRAPH;
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document.getElementById('max-bits-displayed-on-graph').addEventListener('input', (event) => {
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MAX_BITS_DISPLAYED_ON_GRAPH = parseInt(event.target.value);
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})
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document.getElementById('bit-duration-text').value = FREQUENCY_DURATION;
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document.getElementById('amplitude-threshold-text').value = Math.floor(FREQUENCY_THRESHOLD_PERCENT * 100);
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FREQUENCY_THRESHOLD = Math.floor(FREQUENCY_THRESHOLD_PERCENT * 255);
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document.getElementById('maximum-frequency').value = MAXIMUM_FREQUENCY;
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document.getElementById('minimum-frequency').value = MINIMUM_FREQUENCY;
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document.getElementById('last-bit-percent').value = Math.floor(LAST_BIT_PERCENT * 100);
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document.getElementById('fft-size-power-text').value = FFT_POWER;
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document.getElementById('smoothing-time-constant-text').value = SMOOTHING_TIME_CONSTANT.toFixed(2);
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document.getElementById('amplitude-threshold-text').addEventListener('input', (event) => {
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FREQUENCY_THRESHOLD_PERCENT = parseInt(event.target.value) / 100;
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FREQUENCY_THRESHOLD = Math.floor(FREQUENCY_THRESHOLD_PERCENT * 255);
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});
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document.getElementById('maximum-frequency').addEventListener('input', (event) => {
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MAXIMUM_FREQUENCY = parseInt(event.target.value);
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showSpeed();
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});
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document.getElementById('minimum-frequency').addEventListener('input', (event) => {
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MINIMUM_FREQUENCY = parseInt(event.target.value);
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showSpeed();
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});
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document.getElementById('last-bit-percent').addEventListener('input', (event) => {
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LAST_BIT_PERCENT = parseInt(event.target.value) / 100;
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});
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document.getElementById('fft-size-power-text').addEventListener('input', (event) => {
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FFT_POWER = parseInt(event.target.value);
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if(analyser) analyser.fftSize = 2 ** FFT_POWER;
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updateFrequencyResolution();
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resetGraphData();
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});
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updateFrequencyResolution();
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document.getElementById('smoothing-time-constant-text').addEventListener('input', event => {
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SMOOTHING_TIME_CONSTANT = parseFloat(event.target.value);
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if(analyser) analyser.smoothingTimeConstant = SMOOTHING_TIME_CONSTANT;
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});
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document.getElementById('audio-context-sample-rate').innerText = getAudioContext().sampleRate.toLocaleString();
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// wire up events
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sendButton.addEventListener('click', handleSendButtonClick);
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isListeningCheckbox.addEventListener('click', handleListeningCheckbox);
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// textToSend.addEventListener('keypress', handleTextToSendKeypress);
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showSpeed();
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}
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function updateFrequencyResolution() {
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const sampleRate = getAudioContext().sampleRate;
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const fftSize = 2 ** FFT_POWER;
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const frequencyResolution = sampleRate / fftSize;
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const frequencyCount = (sampleRate/2) / frequencyResolution;
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document.getElementById('frequency-resolution').innerText = frequencyResolution.toFixed(2);
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document.getElementById('frequency-count').innerText = frequencyCount.toFixed(2);
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showSpeed();
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}
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function showSpeed() {
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const segmentsPerSecond = 1000 / FREQUENCY_DURATION;
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const bitsPerSegment = getChannels().length;
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const baud = bitsPerSegment * segmentsPerSecond;
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const bytes = baud / 8;
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document.getElementById('durations-per-second').innerText = segmentsPerSecond.toFixed(2);
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document.getElementById('bits-per-duration').innerText = bitsPerSegment;
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document.getElementById('data-transfer-speed-bits-per-second').innerText = baud.toFixed(2);
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document.getElementById('data-transfer-speed-bytes-per-second').innerText = bytes.toFixed(2);
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}
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function getFrequency(bit) {
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return bit ? MAXIMUM_FREQUENCY : MINIMUM_FREQUENCY;
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}
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function getChannels() {
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var audioContext = getAudioContext();
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const sampleRate = audioContext.sampleRate;
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const fftSize = 2 ** FFT_POWER;
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const frequencyResolution = sampleRate / fftSize;
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const channels = [];
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const pairStep = frequencyResolution * 2 * FREQUENCY_RESOLUTION_MULTIPLIER;
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for(let hz = MINIMUM_FREQUENCY; hz < MAXIMUM_FREQUENCY; hz+= pairStep * 2) {
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const low = hz;
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const high = hz + frequencyResolution * FREQUENCY_RESOLUTION_MULTIPLIER;
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if(low < MINIMUM_FREQUENCY) continue;
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if(high > MAXIMUM_FREQUENCY) continue;
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channels.push([low, high]);
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}
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return channels;
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}
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function logSent(text) {
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// display what is being sent
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sentDataTextArea.value += text + '\n';
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sentDataTextArea.scrollTop = sentDataTextArea.scrollHeight;
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}
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function sendBits(bits) {
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const byteCount = bits.length / 8;
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if(bits.length === 0) {
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logSent('No bits to send!');
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return;
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} else if(bits.length % 8 !== 0 || bits.length === 0) {
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logSent('Bit count must be divisible by 8.');
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return;
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} else if(byteCount > (1 << PACKET_SIZE_BITS)) {
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logSent(`Can not transfer more than ${(1 << PACKET_SIZE_BITS)} bytes.`);
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return;
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}
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const packetLength = ((byteCount - 1) >>> 0)
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.toString(2)
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.padStart(PACKET_SIZE_BITS, '0')
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.split('')
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.map(Number);
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bits.unshift(...packetLength);
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logSent(bits.join(''));
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var audioContext = getAudioContext();
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const channels = getChannels();
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const oscillators = [];
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const channelCount = channels.length;
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const currentTime = audioContext.currentTime + 0.1;
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// create our oscillators
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for(let i = 0; i < channelCount; i++) {
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var oscillator = audioContext.createOscillator();
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oscillator.connect(audioContext.destination);
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oscillators.push(oscillator);
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}
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// change our channel frequencies for the bit
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for(let i = 0; i < bits.length; i++) {
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const isHigh = bits[i];
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const channel = i % channelCount;
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const segment = Math.floor(i / channelCount);
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var offset = ((segment * FREQUENCY_DURATION)/1000);
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oscillators[channel].frequency.setValueAtTime(
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channels[channel][isHigh ? 1 : 0],
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currentTime + offset
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);
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}
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// start sending our signal
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oscillators.forEach(o => o.start(currentTime));
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// silence oscillators when done
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for(let i = bits.length; i < bits.length + channelCount; i++) {
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const channel = i % channelCount;
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const segment = Math.floor(i / channelCount);
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const offset = ((segment * FREQUENCY_DURATION) / 1000);
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oscillators[channel].stop(currentTime + offset);
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}
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// start the graph moving again
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resumeGraph();
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}
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function stopGraph() {
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PAUSE = true;
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if(sampleIntervalId) {
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window.clearInterval(sampleIntervalId);
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sampleIntervalId = undefined;
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}
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}
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function resumeGraph() {
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if(isListeningCheckbox.checked) {
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if(PAUSE) {
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PAUSE = false;
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sampleIntervalId = window.setInterval(collectSample, SAMPLE_DELAY_MS);
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resetGraphData();
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requestAnimationFrame(drawFrequencyData);
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} else {
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PAUSE = false;
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}
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} else {
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PAUSE = false;
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}
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}
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function getInteger(start, end, samples) {
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let value = 0;
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let valueIndex = 0;
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for(let i = 0; i < samples.length; i++) {
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for(let j = 0; j < samples[i].pairs.length; j++) {
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if(b >= start) {
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value += getBit(samples[i].pairs[j]) << valueIndex++;
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if(b >= end) return bits;
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}
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b++;
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}
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}
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return bits;
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}
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function collectSample() {
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const time = performance.now();
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const frequencies = new Uint8Array(analyser.frequencyBinCount);
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const length = audioContext.sampleRate / analyser.fftSize;
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let processSegment = false;
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const {
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hasSignal: hadPriorSignal,
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streamStarted: initialStreamStart = -1,
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streamEnded: priorStreamEnded = -1,
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segmentIndex: priorSegmentIndex = -1
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} = frequencyOverTime[0] ?? {}
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analyser.getByteFrequencyData(frequencies);
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const data = {
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time,
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frequencies,
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length,
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streamEnded: priorStreamEnded
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};
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let hasSignal = false;
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data.pairs = getChannels().map(([low, high], i) => {
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const lowAmp = frequencies[Math.round(low / length)];
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const highAmp = frequencies[Math.round(high / length)];
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const isLow = lowAmp > FREQUENCY_THRESHOLD;
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const isHigh = highAmp > FREQUENCY_THRESHOLD;
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if(isLow || isHigh ) hasSignal = true;
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return {
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channel: i,
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lowHz: low,
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highHz: high,
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isMissing: !(isHigh || isLow),
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isHigh: (isHigh && !isLow) || highAmp > lowAmp
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};
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});
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data.hasSignal = hasSignal;
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if(hasSignal) {
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if(hadPriorSignal) {
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// continued bit stream
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data.streamStarted = initialStreamStart;
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// proposed end
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data.streamEnded = priorStreamEnded;
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} else {
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// new bit stream
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data.streamStarted = time;
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// clear last packet
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packetBits.length = 0;
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packetDataByteCount = 0;
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}
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// number of bit in the stream
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const segmentIndex = data.segmentIndex = Math.floor((time - initialStreamStart) / FREQUENCY_DURATION);
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if(priorSegmentIndex !== segmentIndex && priorSegmentIndex !== -1) {
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processSegment = true;
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}
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} else {
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data.segmentIndex = -1;
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if(hadPriorSignal) {
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// just stopped
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data.streamStarted = -1;
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data.streamEnded = -1;
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// update all prior values with stream end if they don't have one
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frequencyOverTime
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.filter(fov => fov.streamStarted === initialStreamStart)
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.filter(fov => fov.streamEnded === -1)
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.forEach(fov => {
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fov.streamEnded === time
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});
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processSegment = true;
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if(PAUSE_AFTER_END && !pauseTimeoutId) {
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pauseTimeoutId = window.setTimeout(() => {
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pauseTimeoutId = undefined;
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if(PAUSE_AFTER_END) stopGraph();
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}, FREQUENCY_DURATION * 1.5);
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}
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} else {
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// continued stopping (or never started)
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data.streamEnded = -1;
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}
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}
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frequencyOverTime.unshift(data);
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if(processSegment) processSegmentReceived();
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truncateGraphData();
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}
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function evaluateBit(samples, segment, channel) {
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const started = samples.find(s => s.streamStarted > 0).streamStarted;
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const bitSamples = samples.filter(sample => {
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return sample.time >= started + (segment * FREQUENCY_DURATION) &&
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sample.time < started + ((segment + 1) * FREQUENCY_DURATION)
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}).map(samples => samples.pairs[channel])
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.reduce((bitSamples, { isHigh, isMissing }) => {
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bitSamples.total++;
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if(isHigh) bitSamples.highCount++;
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}, {highCount: 0, total: 0});
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return bitSamples.highCount >= bitSamples.total / 2 ? 1 : 0;
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}
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function processSegmentReceived() {
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const {
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segmentIndex,
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streamStarted,
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pairs: {
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length: channelCount
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}
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} = frequencyOverTime[0];
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const bits = frequencyOverTime.filter(f =>
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f.segmentIndex === segmentIndex &&
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f.streamStarted === streamStarted
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);
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const bitEnded = bits[0].time;
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const bitStarted = streamStarted + (FREQUENCY_DURATION * segmentIndex);
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const bitDuration = bitEnded - bitStarted;
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// if(bitDuration < FREQUENCY_DURATION * LAST_BIT_PERCENT) {
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// return;
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// }
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const channels = new Array(channelCount).fill(0).map(() => ({isHigh: 0, isLow: 0, isMissing: 0}));
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bits.forEach(({pairs}) => {
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pairs.forEach(({ isHigh, isMissing }, i) => {
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if(isHigh) channels[i].isHigh ++;
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// else if(isMissing) channels[i].isMissing ++;
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else channels[i].isLow++;
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})
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});
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const bitValues = channels.map(({isHigh, isLow, isMissing}) => {
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if(isMissing > isHigh + isLow) return '.';
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return isHigh > isLow ? '1' : '0';
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});
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packetBits.push(...bitValues);
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if(packetBits.length >= 10) {
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// we can evaluate how many bytes are comming
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const dataLengthIndex = Math.floor(10 / channelCount);
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if(dataLengthIndex === segmentIndex) {
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// we just got the bits we needed
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packetDataByteCount = 1 + packetBits
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.slice(0, PACKET_SIZE_BITS)
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.reduce((value, bit) => (value << 1) | bit);
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// let's get the end time
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const totalBits = (packetDataByteCount * 8) + PACKET_SIZE_BITS;
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const segments = Math.ceil(totalBits / channelCount);
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const duration = segments * FREQUENCY_DURATION;
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const streamEnded = streamStarted + duration;
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console.log({
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tenBitNum: packetBits
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.slice(0, PACKET_SIZE_BITS).join(''),
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packetDataByteCount,
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PACKET_SIZE_BITS,
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totalBits,
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segments,
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streamStarted,
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duration,
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streamEnded
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});
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// update everyones proposed end time
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frequencyOverTime
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.filter(fot => fot.streamStarted === streamStarted)
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.forEach(fot => {
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fot.streamEnded = streamEnded
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});
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}
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// remove phantom bits
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const totalBits = (packetDataByteCount * 8) + PACKET_SIZE_BITS;
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if(packetBits.length > totalBits) {
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const excess = packetBits.length % totalBits;
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packetBits.length = totalBits;
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bitValues.length = bitValues.length - excess;
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}
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}
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received(bitValues.join('') + '\n');
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}
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function resetGraphData() {
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frequencyOverTime.length = 0;
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bitStart.length = 0;
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}
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function truncateGraphData() {
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const duration = FREQUENCY_DURATION * MAX_BITS_DISPLAYED_ON_GRAPH;
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const now = performance.now();
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let length = frequencyOverTime.length;
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while(length !== 0) {
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const time = frequencyOverTime[length-1].time;
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if(now - time > duration) length--;
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else break;
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}
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if(length !== frequencyOverTime.length) {
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frequencyOverTime.length = length;
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bitStart.length = length;
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}
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}
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function getAudioContext() {
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if(!audioContext) {
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audioContext = new (window.AudioContext || webkitAudioContext)();
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}
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if(audioContext.state === 'suspended') {
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audioContext.resume();
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}
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return audioContext;
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}
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function textToBits(text) {
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const bits = [];
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for(let i = 0; i < text.length; i++) {
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// const unicode = text.codePointAt(i).toString(2).padStart(16, '0');
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const ascii = text[i].charCodeAt(0).toString(2).padStart(8, '0');
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bits.push(ascii);
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}
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return bits.join('').split('').map(Number);
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}
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function handleSendButtonClick() {
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receivedDataTextarea.value = '';
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sentDataTextArea.value = '';
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const text = document.getElementById('text-to-send').value;
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sendBits(textToBits(text));
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}
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function handleListeningCheckbox(e) {
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stopGraph();
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var audioContext = getAudioContext();
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function handleMicrophoneOn(stream) {
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microphoneStream = stream;
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microphoneNode = audioContext.createMediaStreamSource(stream);
|
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analyser = audioContext.createAnalyser();
|
|
analyser.smoothingTimeConstant = SMOOTHING_TIME_CONSTANT;
|
|
analyser.fftSize = 2 ** FFT_POWER;
|
|
microphoneNode.connect(analyser);
|
|
resumeGraph();
|
|
}
|
|
function handleMicrophoneError(error) {
|
|
console.error('Microphone Error', error);
|
|
}
|
|
if(e.target.checked) {
|
|
navigator.mediaDevices
|
|
.getUserMedia({
|
|
audio: {
|
|
mandatory: {
|
|
autoGainControl: false,
|
|
echoCancellation: false,
|
|
noiseSuppression: false,
|
|
suppressLocalAudioPlayback: false,
|
|
voiceIsolation: false
|
|
},
|
|
optional: []
|
|
}
|
|
})
|
|
.then(handleMicrophoneOn)
|
|
.catch(handleMicrophoneError)
|
|
} else {
|
|
if(microphoneStream) {
|
|
microphoneStream.getTracks().forEach(track => track.stop());
|
|
microphoneStream = undefined;
|
|
}
|
|
if(analyser && microphoneNode) {
|
|
try {
|
|
analyser.disconnect(microphoneNode);
|
|
} catch(e) {
|
|
|
|
}
|
|
microphoneNode = undefined;
|
|
analyser = undefined;
|
|
}
|
|
}
|
|
}
|
|
function received(value) {
|
|
receivedDataTextarea.value += value;
|
|
receivedDataTextarea.scrollTop = receivedDataTextarea.scrollHeight;
|
|
}
|
|
let bitStarted;
|
|
let lastBitStarted;
|
|
let bitEnded;
|
|
let bitHighStrength = [];
|
|
let bitLowStrength = [];
|
|
let lastSegmentIndex = 0;
|
|
|
|
function canHear(hz, {frequencies, length}) {
|
|
var i = Math.round(hz / length);
|
|
return frequencies[i] > FREQUENCY_THRESHOLD;
|
|
}
|
|
function amplitude(hz, {frequencies, length}) {
|
|
var i = Math.round(hz / length);
|
|
return frequencies[i];
|
|
}
|
|
const sum = (total, value) => total + value;
|
|
|
|
// function evaluateBit(highBits, lowBits) {
|
|
// let highCount = highBits.reduce(
|
|
// (count, highAmplitude, i) =>
|
|
// count += highAmplitude > lowBits[i] ? 1 : 0
|
|
// , 0
|
|
// );
|
|
// return highCount >= (highBits.length / 2) ? '1' : '0';
|
|
// }
|
|
|
|
function avgLabel(array) {
|
|
const values = array.filter(v => v > 0);
|
|
if(values.length === 0) return 'N/A';
|
|
return (values.reduce((t, v) => t + v, 0) / values.length).toFixed(2)
|
|
}
|
|
function drawBitDurationLines(ctx, color) {
|
|
const { width, height } = receivedGraph;
|
|
const newest = frequencyOverTime[0].time;
|
|
const duration = FREQUENCY_DURATION * MAX_BITS_DISPLAYED_ON_GRAPH;
|
|
|
|
const streamTimes = frequencyOverTime.filter(({
|
|
streamStarted
|
|
}) => {
|
|
return streamStarted !== -1
|
|
}).reduce((unique, {
|
|
streamStarted,
|
|
streamEnded = newest
|
|
}) => {
|
|
if(unique.every(u => u.streamStarted != streamStarted)) {
|
|
unique.push({streamStarted, streamEnded})
|
|
}
|
|
return unique;
|
|
}, []);
|
|
|
|
ctx.strokeStyle = color;
|
|
streamTimes.forEach(({ streamStarted, streamEnded = newest}) => {
|
|
for(let time = streamStarted; time < streamEnded; time += FREQUENCY_DURATION) {
|
|
if(newest - time > duration) continue;
|
|
const x = ((newest - time) / duration) * width;
|
|
ctx.beginPath();
|
|
ctx.moveTo(x, 0);
|
|
ctx.lineTo(x, height);
|
|
ctx.stroke();
|
|
}
|
|
// write end as well
|
|
const x = ((newest - streamEnded) / duration) * width;
|
|
ctx.beginPath();
|
|
ctx.moveTo(x, 0);
|
|
ctx.lineTo(x, height);
|
|
ctx.stroke();
|
|
});
|
|
}
|
|
|
|
function drawBitStart(ctx, color) {
|
|
const { width, height } = receivedGraph;
|
|
const newest = frequencyOverTime[0].time;
|
|
const duration = FREQUENCY_DURATION * MAX_BITS_DISPLAYED_ON_GRAPH;
|
|
ctx.strokeStyle = color;
|
|
for(let i = 0; i < bitStart.length; i++) {
|
|
if(!bitStart[i]) continue;
|
|
const {time} = frequencyOverTime[i];
|
|
if(newest - time > duration) continue;
|
|
const x = ((newest - time) / duration) * width;
|
|
ctx.beginPath();
|
|
ctx.moveTo(x, 0);
|
|
ctx.lineTo(x, height);
|
|
ctx.stroke();
|
|
}
|
|
}
|
|
function hzAmplitude(hz, length, frequencies) {
|
|
var index = Math.round(hz / length);
|
|
return frequencies[index];
|
|
}
|
|
function getPercentY(percent) {
|
|
const { height } = receivedGraph;
|
|
return (1 - percent) * height;
|
|
}
|
|
function drawFrequencyLineGraph(ctx, hz, color) {
|
|
const { width, height } = receivedGraph;
|
|
const newest = frequencyOverTime[0].time;
|
|
const duration = FREQUENCY_DURATION * MAX_BITS_DISPLAYED_ON_GRAPH;
|
|
ctx.strokeStyle = color;
|
|
ctx.beginPath();
|
|
for(let i = 0; i < frequencyOverTime.length; i++) {
|
|
const {frequencies, time, length} = frequencyOverTime[i];
|
|
const x = getTimeX(time, newest);
|
|
if(x === -1) continue;
|
|
const amplitude = hzAmplitude(hz, length, frequencies);
|
|
const y = getPercentY(amplitude / MAX_DATA);
|
|
if(i === 0) ctx.moveTo(x, y); else ctx.lineTo(x, y);
|
|
}
|
|
ctx.stroke();
|
|
}
|
|
function drawFrequencyDots(ctx, hz, color) {
|
|
const newest = frequencyOverTime[0].time;
|
|
const radius = 2;
|
|
const border = 0.5;
|
|
ctx.fillStyle = color;
|
|
ctx.strokeStyle = 'white';
|
|
ctx.lineWidth = border;
|
|
const fullCircle = 2 * Math.PI;
|
|
for(let i = 0; i < frequencyOverTime.length; i++) {
|
|
const {frequencies, time, length} = frequencyOverTime[i];
|
|
const x = getTimeX(time, newest);
|
|
if(x === -1) continue;
|
|
const amplitude = hzAmplitude(hz, length, frequencies);
|
|
const y = getPercentY(amplitude / MAX_DATA);
|
|
|
|
ctx.beginPath();
|
|
ctx.arc(x, y, radius, 0, fullCircle);
|
|
ctx.fill();
|
|
|
|
ctx.beginPath();
|
|
ctx.arc(x, y, radius + border, 0, fullCircle);
|
|
ctx.stroke();
|
|
}
|
|
}
|
|
function getTimeX(time, newest) {
|
|
const { width } = receivedGraph;
|
|
const duration = FREQUENCY_DURATION * MAX_BITS_DISPLAYED_ON_GRAPH;
|
|
if(newest - time > duration) return -1;
|
|
return ((newest - time) / duration) * width;
|
|
}
|
|
function drawFrequencyData() {
|
|
if(PAUSE) return;
|
|
if(frequencyOverTime.length === 0) {
|
|
requestAnimationFrame(drawFrequencyData);
|
|
return;
|
|
}
|
|
const ctx = receivedGraph.getContext('2d');
|
|
const { width, height } = receivedGraph;
|
|
ctx.fillStyle = 'black';
|
|
ctx.fillRect(0, 0, width, height);
|
|
|
|
const thresholdY = (1 - (FREQUENCY_THRESHOLD/MAX_DATA)) * height;
|
|
ctx.strokeStyle = 'grey';
|
|
ctx.beginPath();
|
|
ctx.moveTo(0, thresholdY);
|
|
ctx.lineTo(width, thresholdY);
|
|
ctx.stroke();
|
|
drawBitDurationLines(ctx, 'yellow');
|
|
drawBitStart(ctx, 'green');
|
|
const frequencies = getChannels();
|
|
frequencies.forEach(([low, high], i) => {
|
|
if(i >= frequencies.length - 1) {
|
|
drawFrequencyLineGraph(ctx, high, 'pink');
|
|
drawFrequencyLineGraph(ctx, low, 'cyan');
|
|
} else {
|
|
drawFrequencyLineGraph(ctx, high, 'rgba(255, 0, 0, .5)');
|
|
drawFrequencyLineGraph(ctx, low, 'rgba(0, 0, 255, .5)');
|
|
}
|
|
});
|
|
|
|
requestAnimationFrame(drawFrequencyData);
|
|
}
|
|
|
|
function drawReceivedData() {
|
|
const ctx = receivedGraph.getContext('2d');
|
|
const { width, height } = receivedGraph;
|
|
const segmentWidth = (1 / MAX_BITS_DISPLAYED_ON_GRAPH) * width;
|
|
ctx.clearRect(0, 0, width, height);
|
|
const sorted = receivedData.slice().sort((a, b) => a - b);
|
|
const min = sorted[0];
|
|
const max = sorted[sorted.length - 1];
|
|
const range = max - min;
|
|
ctx.beginPath();
|
|
for(let i = 0; i < MAX_BITS_DISPLAYED_ON_GRAPH && i < receivedData.length; i++) {
|
|
const value = receivedData[i];
|
|
const y = (1-(value / range)) * height;
|
|
if(i === 0) {
|
|
ctx.moveTo(0, y);
|
|
} else {
|
|
ctx.lineTo(segmentWidth * i, y)
|
|
}
|
|
}
|
|
ctx.stroke();
|
|
}
|
|
|
|
|
|
window.addEventListener('load', handleWindowLoad); |