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rainviewer-google-maps-example.html
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<!DOCTYPE html>
<html>
<head>
<title>RainViewer API Example for Google Maps</title>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style type="text/css">
li {
list-style: none;
display: inline-block;
}
</style>
</head>
<body>
<ul style="text-align:center; position: absolute;top: 0; left: 0; right: 0; height: 50px;">
<li><input type="radio" name="kind" checked="checked" onchange="setKind('radar')">Radar (Past + Future) <input type="radio" name="kind" onchange="setKind('satellite')">Infrared Satellite</li>
<li><input type="button" onclick="stop(); showFrame(animationPosition - 1); return;" value="<" /></li>
<li><input type="button" onclick="playStop();" value="Play / Stop" /></li>
<li><input type="button" onclick="stop(); showFrame(animationPosition + 1); return;" value=">" /></li>
<li><select id="colors" onchange="setColors(); return;">
<option value="0">Black and White Values</option>
<option value="1">Original</option>
<option value="2" selected="selected">Universal Blue</option>
<option value="3">TITAN</option>
<option value="4">The Weather Channel</option>
<option value="5">Meteored</option>
<option value="6">NEXRAD Level-III</option>
<option value="7">RAINBOW @ SELEX-SI</option>
<option value="8">Dark Sky</option>
</select></li>
</ul>
<div id="timestamp" style="text-align:center; position: absolute;top: 50px; left: 0; right: 0; height: 80px;">FRAME TIME</div>
<div id="mapid" style="position: absolute; top: 80px; left: 0; bottom: 0; right: 0;"></div>
<script>
var map;
function initMap() {
map = new google.maps.Map(document.getElementById('mapid'), {
center: {lat: 48.8566, lng: 2.3522},
zoom: 6
});
/**
* Load actual radar animation frames timestamps from RainViewer API
*/
var apiRequest = new XMLHttpRequest();
apiRequest.open("GET", "https://api.rainviewer.com/public/weather-maps.json", true);
apiRequest.onload = function(e) {
// store the API response for re-use purposes in memory
apiData = JSON.parse(apiRequest.response);
initialize(apiData, optionKind);
};
apiRequest.send();
}
/**
* RainViewer radar animation part
* @type {number[]}
*/
var apiData = {};
var mapFrames = [];
var lastPastFramePosition = -1;
var radarLayers = [];
var optionKind = 'radar'; // can be 'radar' or 'satellite'
var optionTileSize = 256; // can be 256 or 512.
var optionColorScheme = 2; // from 0 to 8. Check the https://rainviewer.com/api/color-schemes.html for additional information
var optionSmoothData = 1; // 0 - not smooth, 1 - smooth
var optionSnowColors = 1; // 0 - do not show snow colors, 1 - show snow colors
var animationPosition = 0;
var animationTimer = false;
/**
* Initialize internal data from the API response and options
*/
function initialize(api, kind) {
// remove all already added tiled layers
map.overlayMapTypes.clear();
mapFrames = [];
radarLayers = [];
animationPosition = 0;
if (!api) {
return;
}
if (kind == 'satellite' && api.satellite && api.satellite.infrared) {
mapFrames = api.satellite.infrared;
lastPastFramePosition = api.satellite.infrared.length - 1;
showFrame(lastPastFramePosition);
}
else if (api.radar && api.radar.past) {
mapFrames = api.radar.past;
if (api.radar.nowcast) {
mapFrames = mapFrames.concat(api.radar.nowcast);
}
// show the last "past" frame
lastPastFramePosition = api.radar.past.length - 1;
showFrame(lastPastFramePosition);
}
}
/**
* Animation functions
* @param path - Path to the XYZ tile
*/
function addLayer(frame) {
if (!radarLayers[frame.path]) {
var colorScheme = optionKind == 'satellite' ? 0 : optionColorScheme;
var smooth = optionKind == 'satellite' ? 0 : optionSmoothData;
var snow = optionKind == 'satellite' ? 0 : optionSnowColors;
radarLayers[frame.path] = new google.maps.ImageMapType({
getTileUrl: function(coord, zoom) {
return [apiData.host + frame.path, optionTileSize,
zoom, coord.x, coord.y, colorScheme, smooth + '_' + snow + '.png'].join('/');
},
tileSize: new google.maps.Size(256, 256),
opacity: 0.001
});
map.overlayMapTypes.push(radarLayers[frame.path]);
}
}
/**
* Display particular frame of animation for the @position
* If preloadOnly parameter is set to true, the frame layer only adds for the tiles preloading purpose
* @param position
* @param preloadOnly
*/
function changeRadarPosition(position, preloadOnly) {
while (position >= mapFrames.length) {
position -= mapFrames.length;
}
while (position < 0) {
position += mapFrames.length;
}
var currentFrame = mapFrames[animationPosition];
var nextFrame = mapFrames[position];
addLayer(nextFrame);
if (preloadOnly) {
return;
}
animationPosition = position;
if (radarLayers[currentFrame.path]) {
radarLayers[currentFrame.path].setOpacity(0);
}
radarLayers[nextFrame.path].setOpacity(100);
var pastOrForecast = nextFrame.time > Date.now() / 1000 ? 'FORECAST' : 'PAST';
document.getElementById("timestamp").innerHTML = pastOrForecast + ': ' + (new Date(nextFrame.time * 1000)).toString();
}
/**
* Check avialability and show particular frame position from the timestamps list
*/
function showFrame(nextPosition) {
var preloadingDirection = nextPosition - animationPosition > 0 ? 1 : -1;
changeRadarPosition(nextPosition);
// preload next next frame (typically, +1 frame)
// if don't do that, the animation will be blinking at the first loop
changeRadarPosition(nextPosition + preloadingDirection, true);
}
/**
* Stop the animation
* Check if the animation timeout is set and clear it.
*/
function stop() {
if (animationTimer) {
clearTimeout(animationTimer);
animationTimer = false;
return true;
}
return false;
}
function play() {
showFrame(animationPosition + 1);
// Main animation driver. Run this function every 500 ms
animationTimer = setTimeout(play, 500);
}
function playStop() {
if (!stop()) {
play();
}
}
/**
* Change map options
*/
function setKind(kind) {
optionKind = kind;
initialize(apiData, optionKind);
}
function setColors() {
var e = document.getElementById('colors');
optionColorScheme = e.options[e.selectedIndex].value;
initialize(apiData, optionKind);
}
/**
* Handle arrow keys for navigation between next \ prev frames
*/
document.onkeydown = function (e) {
e = e || window.event;
switch (e.which || e.keyCode) {
case 37: // left
stop();
showFrame(animationPosition - 1);
break;
case 39: // right
stop();
showFrame(animationPosition + 1);
break;
default:
return; // exit this handler for other keys
}
e.preventDefault();
return false;
}
</script>
<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY_HERE&callback=initMap" async defer></script>
</body>
</html>