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store already processed radar images for reuse on silent reload

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This commit is contained in:
Matt Walsh
2025-06-27 15:29:20 -05:00
parent 15107ffe1c
commit b870ce1c01
1 changed files with 38 additions and 6 deletions
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44
server/scripts/modules/radar.mjs
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@@ -8,6 +8,10 @@ import * as utils from './radar-utils.mjs';
import setTiles from './radar-tiles.mjs';
import processRadar from './radar-processor.mjs';
// store processed radar as dataURLs to avoid re-processing frames as they slide backwards in time
// this is cleared upon changing the location displayed
let processedRadars = [];
const RADAR_HOST = 'mesonet.agron.iastate.edu';
class Radar extends WeatherDisplay {
constructor(navId, elemId) {
@@ -110,19 +114,44 @@ class Radar extends WeatherDisplay {
elemId: this.elemId,
});
const radarKey = `${radarSourceXY.x.toFixed(0)}-${radarSourceXY.y.toFixed(0)}`;
// reset the "used" flag on pre-processed radars
// items that were not used during this process are deleted (either expired via time or change of location)
processedRadars.forEach((radar) => { radar.used = false; });
// remove any radars that aren't
// Load the most recent doppler radar images.
const radarInfo = await Promise.all(urls.map(async (url) => {
const processedRadar = await processRadar({
// store the time
const timeMatch = url.match(/_(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)\./);
const [, year, month, day, hour, minute] = timeMatch;
const radarKeyedTimestamp = `${radarKey}:${year}${month}${day}${hour}${minute}`;
// check for a pre-processed radar
const preProcessed = processedRadars.find((radar) => radar.key === radarKeyedTimestamp);
// use the pre-processed radar, or get a new one
const processedRadar = preProcessed?.dataURL ?? await processRadar({
url,
RADAR_HOST,
OVERRIDES,
radarSourceXY,
});
// store the time
const timeMatch = url.match(/_(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)\./);
// store the radar
if (!preProcessed) {
processedRadars.push({
key: radarKeyedTimestamp,
dataURL: processedRadar,
used: true,
});
} else {
// set used flag
preProcessed.used = true;
}
const [, year, month, day, hour, minute] = timeMatch;
const time = DateTime.fromObject({
year,
month,
@@ -150,12 +179,15 @@ class Radar extends WeatherDisplay {
this.times = radarInfo.map((radar) => radar.time);
this.setStatus(STATUS.loaded);
// clean up any unused stored radars
processedRadars = processedRadars.filter((radar) => radar.used);
}
async drawCanvas() {
super.drawCanvas();
const time = this.times[this.screenIndex].toLocaleString(DateTime.TIME_SIMPLE);
const timePadded = time.length >= 8 ? time : ` ${time}`;
const timePadded = time.length >= 8 ? time : ` ${time} `;
this.elem.querySelector('.header .right .time').innerHTML = timePadded;
// get image offset calculation
@@ -163,7 +195,7 @@ class Radar extends WeatherDisplay {
const actualFrameHeight = this.elem.querySelector('.frame').scrollHeight;
// scroll to image
this.elem.querySelector('.scroll-area').style.top = `${-this.screenIndex * actualFrameHeight}px`;
this.elem.querySelector('.scroll-area').style.top = `${-this.screenIndex * actualFrameHeight} px`;
this.finishDraw();
}