mirror of https://github.com/espruino/BangleApps
111 lines
2.7 KiB
JavaScript
111 lines
2.7 KiB
JavaScript
var tStart = Date.now();
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var cindex=0; // index to iterate through colous
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var bpm=60; // ininital bpm value
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var time_diffs = [1000, 1000, 1000]; //array to calculate mean bpm
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var tindex=0; //index to iterate through time_diffs
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Bangle.setLCDTimeout(undefined); //do not deaktivate display while running this app
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const storage = require("Storage");
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const SETTINGS_FILE = 'metronome.settings.json';
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//return setting
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function setting(key) {
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//define default settings
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const DEFAULTS = {
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'beatsperbar': 4,
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'buzzintens': 0.75,
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};
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if (!settings) { loadSettings(); }
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return (key in settings) ? settings[key] : DEFAULTS[key];
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}
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//load settings
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let settings;
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function loadSettings() {
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settings = storage.readJSON(SETTINGS_FILE, 1) || {};
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}
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function changecolor() {
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const colors = {
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0: { value: 0xF800, name: "Red" },
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1: { value: 0xFFFF, name: "White" },
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2: { value: 0x9492, name: "gray" },
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3: { value: 0xFFFF, name: "White" },
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4: { value: 0x9492, name: "gray" },
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5: { value: 0xFFFF, name: "White" },
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6: { value: 0x9492, name: "gray" },
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7: { value: 0xFFFF, name: "White" },
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};
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g.setColor(colors[cindex].value);
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if (cindex == setting('beatsperbar')-1) {
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cindex = 0;
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}
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else {
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cindex += 1;
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}
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return cindex;
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}
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function updateScreen() {
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g.reset().clearRect(0, 50, 250, 150);
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changecolor();
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try {
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Bangle.buzz(50, setting('buzzintens'));
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} catch(err) {
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}
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g.setFont("Vector",40).setFontAlign(0,0);
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g.drawString(Math.floor(bpm)+"bpm", g.getWidth()/2, 100);
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}
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Bangle.on('touch', function(button) {
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// setting bpm by tapping the screen. Uses the mean time difference between several tappings.
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if (tindex < time_diffs.length) {
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if (Date.now()-tStart < 5000) {
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time_diffs[tindex] = Date.now()-tStart;
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}
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} else {
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tindex=0;
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time_diffs[tindex] = Date.now()-tStart;
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}
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tindex += 1;
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mean_time = 0.0;
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for(count = 0; count < time_diffs.length; count++) {
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mean_time += time_diffs[count];
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}
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time_diff = mean_time/count;
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tStart = Date.now();
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clearInterval(time_diff);
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bpm = (60 * 1000/(time_diff));
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updateScreen();
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clearInterval(interval);
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interval = setInterval(updateScreen, 60000 / bpm);
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return bpm;
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});
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// enable bpm finetuning via buttons.
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setWatch(() => {
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bpm += 1;
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clearInterval(interval);
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interval = setInterval(updateScreen, 60000 / bpm);
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}, BTN1, {repeat:true});
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setWatch(() => {
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if (bpm > 1) {
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bpm -= 1;
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clearInterval(interval);
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interval = setInterval(updateScreen, 60000 / bpm);
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}
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}, BTN3, {repeat:true});
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interval = setInterval(updateScreen, 60000 / bpm);
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g.clear(1).setFont("6x8");
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g.drawString('Touch the screen to set tempo.\nUse BTN1 to increase, and\nBTN3 to decrease bpm value by 1.', 25, 200);
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Bangle.loadWidgets();
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Bangle.drawWidgets();
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