forked from FOSS/BangleApps
146 lines
3.6 KiB
JavaScript
146 lines
3.6 KiB
JavaScript
/**
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* Copyright reelyActive 2021
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* We believe in an open Internet of Things
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*/
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// Emojis are integer pairs with the form [ image, Unicode code point ]
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// For code points see https://unicode.org/emoji/charts/emoji-list.html
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const EMOJIS = [
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[ ':)', 0x1f642 ], // Slightly smiling
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[ ':|', 0x1f610 ], // Neutral
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[ ':(', 0x1f641 ], // Slightly frowning
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[ '+1', 0x1f44d ], // Thumbs up
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[ '-1', 0x1f44e ], // Thumbs down
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[ '<3', 0x02764 ], // Heart
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];
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const EMOJI_TRANSMISSION_MILLISECONDS = 5000;
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const BLINK_PERIOD_MILLISECONDS = 500;
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const TRANSMIT_BUZZ_MILLISECONDS = 200;
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const CYCLE_BUZZ_MILLISECONDS = 50;
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// Non-user-configurable constants
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const IMAGE_INDEX = 0;
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const CODE_POINT_INDEX = 1;
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const BTN_WATCH_OPTIONS = { repeat: true, debounce: 20, edge: "falling" };
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const UNICODE_CODE_POINT_ELIDED_UUID = [ 0x49, 0x6f, 0x49, 0x44, 0x55,
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0x54, 0x46, 0x2d, 0x33, 0x32 ];
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// Global variables
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let emojiIndex = 0;
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let isToggleOn = false;
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let isTransmitting = false;
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let lastDragX = 0;
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let lastDragY = 0;
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// Cycle through emojis
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function cycleEmoji(isForward) {
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if(isTransmitting) { return; }
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if(isForward) {
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emojiIndex = (emojiIndex + 1) % EMOJIS.length;
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}
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else if(--emojiIndex < 0) {
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emojiIndex = EMOJIS.length - 1;
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}
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drawImage(EMOJIS[emojiIndex][IMAGE_INDEX]);
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Bangle.buzz(CYCLE_BUZZ_MILLISECONDS);
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}
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// Handle a touch: transmit displayed emoji
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function handleTouch(zone, event) {
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if(isTransmitting) { return; }
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let emoji = EMOJIS[emojiIndex];
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transmitEmoji(emoji[IMAGE_INDEX], emoji[CODE_POINT_INDEX],
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EMOJI_TRANSMISSION_MILLISECONDS);
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Bangle.buzz(TRANSMIT_BUZZ_MILLISECONDS);
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}
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// Transmit the given code point for the given duration in milliseconds,
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// blinking the image once per second.
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function transmitEmoji(image, codePoint, duration) {
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let instance = [ 0x00, 0x00, (codePoint >> 24) & 0xff,
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(codePoint >> 16) & 0xff, (codePoint >> 8) & 0xff,
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codePoint & 0xff ];
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require('ble_eddystone_uid').advertise(UNICODE_CODE_POINT_ELIDED_UUID,
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instance);
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isTransmitting = true;
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let displayIntervalId = setInterval(toggleImage, BLINK_PERIOD_MILLISECONDS,
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image);
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setTimeout(terminateEmoji, duration, displayIntervalId);
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}
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// Terminate the emoji transmission
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function terminateEmoji(displayIntervalId) {
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NRF.setAdvertising({ });
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isTransmitting = false;
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clearInterval(displayIntervalId);
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drawImage(EMOJIS[emojiIndex][IMAGE_INDEX]);
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}
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// Toggle the display between image/off
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function toggleImage(image) {
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if(isToggleOn) {
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drawImage(EMOJIS[emojiIndex][IMAGE_INDEX]);
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}
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else {
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g.clear();
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}
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isToggleOn = !isToggleOn;
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}
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// Draw the given emoji
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function drawImage(image) {
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g.clear();
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g.drawString(image, g.getWidth() / 2, g.getHeight() / 2);
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g.flip();
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}
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// Handle a drag event
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function handleDrag(event) {
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let isFingerReleased = (event.b === 0);
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if(isFingerReleased) {
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let isHorizontalDrag = (Math.abs(lastDragX) >= Math.abs(lastDragY)) &&
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(lastDragX !== 0);
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if(isHorizontalDrag) {
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cycleEmoji(lastDragX > 0);
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}
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}
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else {
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lastDragX = event.dx;
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lastDragY = event.dy;
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}
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}
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// Special function to handle display switch on
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Bangle.on('lcdPower', (on) => {
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if(on) {
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drawImage(EMOJIS[emojiIndex][IMAGE_INDEX]);
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}
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});
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// On start: display the first emoji and handle drag and touch events
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g.clear();
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g.setFont('Vector', 80);
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g.setFontAlign(0, 0);
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drawImage(EMOJIS[emojiIndex][IMAGE_INDEX]);
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Bangle.on('touch', handleTouch);
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Bangle.on('drag', handleDrag);
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