forked from La_Bureautique/zeg1jeux
55 lines
1.4 KiB
JavaScript
55 lines
1.4 KiB
JavaScript
const SONAR_DURATION = 5;
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function computeLatDistanceInKm (dest, orig) {
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// Approximation française
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return ((dest - orig) * 111);
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}
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function computeLonDistanceInKm (dest, orig) {
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// Approximation française
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return ((dest - orig) * 79);
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}
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function computeDelay (latDistanceKm, lonDistanceKm, sonarDuration) {
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placeDirection = Math.atan(latDistanceKm / lonDistanceKm);
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placeWay = lonDistanceKm < 0 ? -1 : 1;
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placeAngle = placeDirection * placeWay;
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unsignedAngle = placeAngle + (2 * Math.PI);
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animOrigAngle = 3 * Math.PI / 2;
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animAngle_verbose = animOrigAngle + unsignedAngle;
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animAngle_bounded = fmod(animAngle_verbose, (2 * Math.PI));
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circleRatio = animAngle_bounded / (2 * Math.PI);
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delay = circleRatio * sonarDuration;
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return delay;
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}
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var places = document.getElementsByClassName('place');
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var map = document.getElementById('map');
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var origLat = map.getAttribute('data-orig-lat');
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var origLon = map.getAttribute('data-orig-lon');
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for (place of places) {
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if ( !( (placeLat == origLat) && (placeLon == origLon) ) ) {
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var placeLat = place.getAttribute("data-place-lat");
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var placeLon = place.getAttribute("data-place-lon");
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var latDistanceKm = computeLatDistanceInKm(placeLat, origLat);
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var lonDistanceKm = computeLonDistanceInKm(placeLon, origLon);
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var delay = computeDelay(latDistanceKm, lonDistanceKm, SONAR_DURATION);
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place.style.animationDelay = delay + 's';
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console.log('delay JS : ' + delay);
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}
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} |