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forward/back navigation through travel forecast with timing

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This commit is contained in:
Matt Walsh
2020-09-04 15:46:31 -05:00
parent f27db7c66e
commit 81378359c9
4 changed files with 108 additions and 46 deletions
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71
server/scripts/modules/travelforecast.js
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@@ -9,15 +9,30 @@ class TravelForecast extends WeatherDisplay {
// pre-load background image (returns promise)
this.backgroundImage = utils.image.load('images/BackGround6_1.png');
// height of one city in the travel forecast
this.cityHeight = 72;
// set up the timing
this.timing.baseDelay = 20;
// page sizes are 4 cities, calculate the number of pages necessary plus overflow
const pagesFloat = _TravelCities.length/4;
const pages = Math.floor(pagesFloat) - 1; // first page is already displayed
const extra = pages%1;
const timingStep = this.cityHeight*4;
this.timing.delay = [150];
// add additional pages
for (let i = 0; i < pages; i++) this.timing.delay.push(timingStep);
// add the extra (not exactly 4 pages portion)
if (extra !== 0) this.timing.delay.push(Math.round(this.extra*this.cityHeight));
// add the final 3 second delay
this.timing.delay.push(150);
// get the data
this.getData(weatherParameters);
// scrolling tracking
this.scrollCount = 0;
this.endDelay = 0;
}
async getData() {
super.getData();
const forecastPromises = _TravelCities.map(async city => {
try {
// get point then forecast
@@ -70,7 +85,7 @@ class TravelForecast extends WeatherDisplay {
this.longContext.clearRect(0,0,this.longCanvas.width,this.longCanvas.height);
// draw the "long" canvas with all cities
draw.box(this.longContext, 'rgb(35, 50, 112)', 0, 0, 640, 1728);
draw.box(this.longContext, 'rgb(35, 50, 112)', 0, 0, 640, _TravelCities.length*this.cityHeight);
for (let i = 0; i <= 4; i++) {
const y = i * 346;
@@ -79,7 +94,7 @@ class TravelForecast extends WeatherDisplay {
await Promise.all(cities.map(async (city, index) => {
// calculate base y value
const y = 50+72*index;
const y = 50+this.cityHeight*index;
// city name
draw.text(this.longContext, 'Star4000 Large Compressed', '24pt', '#FFFF00', 80, y, city.name, 2);
@@ -134,34 +149,30 @@ class TravelForecast extends WeatherDisplay {
// copy the scrolled portion of the canvas for the initial run before the scrolling starts
this.context.drawImage(this.longCanvas, 0, 0, 640, 289, 0, 110, 640, 289);
// set up scrolling one time
if (!this.scrollInterval) {
this.scrollInterval = window.setInterval(() => {
if (this.isActive()) {
// get a fresh canvas
const longCanvas = this.getLongCanvas();
// increment scrolling
this.scrollCount++;
// wait 3 seconds at begining
if (this.scrollCount < 150) return;
// calculate scroll offset and don't go past end of canvas
const offsetY = Math.min(longCanvas.height-289, (this.scrollCount-150));
// copy the scrolled portion of the canvas
this.context.drawImage(longCanvas, 0, offsetY, 640, 289, 0, 110, 640, 289);
// track end of scrolling for 3 seconds
if (offsetY >= longCanvas.height-289) this.endDelay++;
// TODO: report playback done
} else {
// reset scroll to top of image
this.scrollCount = 0;
this.endDelay = 0;
}
}, 20);
}
this.finishDraw();
this.setStatus(STATUS.loaded);
}
// screen index change callback just runs the base count callback
screenIndexChange() {
this.baseCountChange(this.navBaseCount);
}
// base count change callback
baseCountChange(count) {
// get a fresh canvas
const longCanvas = this.getLongCanvas();
// calculate scroll offset and don't go past end
let offsetY = Math.min(longCanvas.height-289, (count-this.timing.delay[0]));
// don't let offset go negative
if (offsetY < 0) offsetY = 0;
// copy the scrolled portion of the canvas
this.context.drawImage(longCanvas, 0, offsetY, 640, 289, 0, 110, 640, 289);
}
getTravelCitiesDayName(cities) {
const {DateTime} = luxon;
// effectively returns early on the first found date