96 lines
2.1 KiB
JavaScript
96 lines
2.1 KiB
JavaScript
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'use strict';
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/* globals draw, navigation */
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// eslint-disable-next-line no-unused-vars
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const currentWeatherScroll = (() => {
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// local variables
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let context; // currently active context
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let blankDrawArea; // original state of context
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let station;
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let interval;
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let screenIndex = 0;
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// start drawing conditions
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// reset starts from the first item in the text scroll list
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const start = (_context) => {
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// see if there is a context available
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if (!_context) return;
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// store see if the context is new
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if (_context !== context) {
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// clean the outgoing context
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cleanLastContext();
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// store the new blank context
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blankDrawArea = _context.getImageData(0, 405, 640, 75);
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}
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// store the context locally
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context = _context;
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// set up the interval if needed
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if (!interval) {
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interval = setInterval(incrementInterval, 700);
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}
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// draw the data
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drawScreen();
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};
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const stop = (reset) => {
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cleanLastContext();
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if (interval) interval = clearInterval(interval);
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if (reset) screenIndex = 0;
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};
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const cleanLastContext = () => {
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if (blankDrawArea) context.putImageData(blankDrawArea, 0, 405);
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blankDrawArea = undefined;
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context = undefined;
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};
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// increment interval, roll over
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const incrementInterval = () => {
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screenIndex = (screenIndex+1)%2;
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// draw new text
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drawScreen();
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};
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const drawScreen = () => {
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// get the conditions
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const data = navigation.getCurrentWeather();
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// nothing to do if there's no data yet
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if (!data) return;
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if (!station) return;
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// clean up any old text
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context.putImageData(blankDrawArea, 0, 405);
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switch (screenIndex) {
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case 0:
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default:
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drawCondition(`Conditions at ${station.name.substr(0,20)}`);
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break;
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case 1:
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drawCondition(`Page 2`);
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break;
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}
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};
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// internal draw function with preset parameters
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const drawCondition = (text) => {
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draw.text(context, 'Star4000', '24pt', '#ffffff', 70, 430, text, 2);
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};
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// store the latest station data
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const setStation = (weatherParameters) => {
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station = weatherParameters.stations[0].properties;
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};
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// return the api
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return {
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start,
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stop,
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setStation,
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};
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})();
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