rainviewer-api-example/rainviewer-api-example.html at master · rainviewer/rainviewer-api-example · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
<!DOCTYPE html>
<html>
<head>
    <title>Rain Viewer Weather Maps API Example (Personal Use)</title>
    <meta charset="utf-8"/>
    <meta content="width=device-width, initial-scale=1.0" name="viewport">
    <link href="https://unpkg.com/leaflet/dist/leaflet.css" rel="stylesheet"/>
    <script src="https://unpkg.com/leaflet/dist/leaflet.js"></script>
    <style>
        body { margin: 0; font-family: sans-serif; }
        .controls {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 50px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;
            background: white;
            z-index: 1000;
            box-sizing: border-box;
        }
        .title {
            font-weight: 400;
            color: #333;
        }
        #timestamp {
            font-size: 18px;
            font-weight: 600;
            color: #333;
        }
        .buttons {
            display: flex;
            gap: 8px;
        }
        .buttons button {
            width: 36px;
            height: 36px;
            border: 1px solid #ddd;
            border-radius: 4px;
            background: #fff;
            cursor: pointer;
            font-size: 16px;
        }
        .buttons button:hover {
            background: #f5f5f5;
        }
        #mapid {
            position: absolute;
            top: 50px;
            left: 0;
            bottom: 0;
            right: 0;
        }
    </style>
</head>
<body>

<div class="controls">
    <span class="title">Weather Radar</span>
    <span id="timestamp">Loading...</span>
    <div class="buttons">
        <button onclick="stop(); showFrame(animationPosition - 1);">‹</button>
        <button id="playBtn" onclick="playStop();">▶</button>
        <button onclick="stop(); showFrame(animationPosition + 1);">›</button>
    </div>
</div>

<div id="mapid"></div>

<script>
// === CONFIGURATION ===
var TILE_SIZE = window.devicePixelRatio >= 2 ? 512 : 256;
var RADAR_OPACITY = 0.8;
var ANIMATION_DELAY_MS = 500;
var API_URL = "https://api.rainviewer.com/public/weather-maps.json";

// === STATE ===
var apiData = {};
var mapFrames = [];
var animationPosition = 0;
var animationTimer = false;
var currentLayer = null;
var isLoading = false;
var layerCache = {};

// === MAP SETUP ===
var map = L.map('mapid', { maxZoom: 12 }).setView([48.8566, 2.3522], 5);

L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
    attribution: '&copy; <a href="https://openstreetmap.org">OpenStreetMap</a> contributors'
}).addTo(map);

// === UTILITIES ===
function wrapPosition(position) {
    while (position >= mapFrames.length) {
        position -= mapFrames.length;
    }
    while (position < 0) {
        position += mapFrames.length;
    }
    return position;
}

function formatTime(timestamp) {
    return new Date(timestamp * 1000).toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
}

// === LAYER MANAGEMENT ===
function createRadarLayer(frame) {
    return new L.TileLayer(apiData.host + frame.path + '/' + TILE_SIZE + '/{z}/{x}/{y}/2/1_1.png', {
        tileSize: 256,
        opacity: 0.001,
        maxNativeZoom: 7,
        maxZoom: 12
    });
}

function clearLayerCache() {
    stop();
    for (var pos in layerCache) {
        if (parseInt(pos) !== animationPosition) {
            map.removeLayer(layerCache[pos]);
            delete layerCache[pos];
        }
    }
}

// === ANIMATION CONTROL ===
function stop() {
    if (animationTimer) {
        clearTimeout(animationTimer);
        animationTimer = false;
        document.getElementById("playBtn").innerHTML = "▶";
        return true;
    }
    return false;
}

function play() {
    animationTimer = true;
    document.getElementById("playBtn").innerHTML = "⏸";
    showFrame(animationPosition + 1);
}

function playStop() {
    if (!stop()) {
        play();
    }
}

// === DISPLAY ===
function updateTimestamp(frame) {
    document.getElementById("timestamp").innerHTML = formatTime(frame.time);
}

function showFrame(position) {
    if (isLoading) return;

    position = wrapPosition(position);
    var frame = mapFrames[position];

    updateTimestamp(frame);

    var oldLayer = currentLayer;

    if (layerCache[position]) {
        if (oldLayer) {
            oldLayer.setOpacity(0);
        }
        layerCache[position].setOpacity(RADAR_OPACITY);
        currentLayer = layerCache[position];
        animationPosition = position;

        if (animationTimer) {
            animationTimer = setTimeout(play, ANIMATION_DELAY_MS);
        }
        return;
    }

    isLoading = true;

    var newLayer = createRadarLayer(frame);

    newLayer.on('load', function() {
        newLayer.setOpacity(RADAR_OPACITY);
        if (oldLayer) {
            oldLayer.setOpacity(0);
        }
        layerCache[position] = newLayer;
        currentLayer = newLayer;
        animationPosition = position;
        isLoading = false;

        if (animationTimer) {
            animationTimer = setTimeout(play, ANIMATION_DELAY_MS);
        }
    });

    newLayer.addTo(map);
}

// === INITIALIZATION ===
function initialize(api) {
    clearLayerCache();
    currentLayer = null;
    mapFrames = [];
    animationPosition = 0;

    if (!api || !api.radar || !api.radar.past) {
        return;
    }

    mapFrames = api.radar.past;
    showFrame(mapFrames.length - 1);
}

function loadApiData() {
    var apiRequest = new XMLHttpRequest();
    apiRequest.open("GET", API_URL, true);
    apiRequest.onload = function() {
        apiData = JSON.parse(apiRequest.response);
        initialize(apiData);
    };
    apiRequest.send();
}

map.on('movestart', clearLayerCache);
loadApiData();
</script>

</body>
</html>