以程式產生圖示

增加一個由程式產生的圖示

範例展示

原始碼

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>以程式產生圖示 - Map8 Platform Documentation</title>
    <link rel="stylesheet" href="https://api.map8.zone/css/gomp.css?key=[YOUR_KEY_HERE]" />
    <style>
        #map{
            height: 400px;
            width: 100%;
        }
    </style>
</head>
<body>
    <div id="map"></div>

    <script type="text/javascript" src="https://api.map8.zone/maps/js/gomp.js?key=[YOUR_KEY_HERE]"></script>
    <script type="text/javascript">
        gomp.accessToken = '[YOUR_KEY_HERE]';
        var map = new gomp.Map({
            container: 'map', // 地圖容器 ID
            style: 'https://api.map8.zone/styles/go-life-maps-tw-style-std/style.json', // 地圖樣式檔案位置
            maxBounds: [[105, 15], [138.45858, 33.4]], // 台灣地圖區域
            center: [121.54885, 25.03625], // 初始中心座標，格式為 [lng, lat]
            zoom: 16, // 初始 ZOOM LEVEL; [0-20, 0 為最小 (遠), 20 ;最大 (近)]
            minZoom: 6, // 限制地圖可縮放之最小等級, 可省略, [0-19.99]
            maxZoom: 19.99, // 限制地圖可縮放之最大等級, 可省略 [0-19.99]
            pitch: 50, // 攝影機仰角, 可省略, [0-60]
            bearing: 0, // 地圖角度, 可省略, [-180 ~ 180; 0 為正北朝上, 180 為正南朝上]
            speedLoad: false,
            attributionControl: false
        }).addControl(new gomp.AttributionControl({
            compact: false
        }));
            
        map.on('load', function () {
            var width = 32; // 圖示尺寸為 32 × 32
            var pixelBytes = 4; // RGBA
            var data = new Uint8Array(width * width * pixelBytes);
                
            for (var x = 0; x < width; x++) {
                for (var y = 0; y < width; y++) {
                    var offset = (y * width + x) * pixelBytes;
                    data[offset + 0] = y / width * 255; // R
                    data[offset + 1] = x / width * 111; // G
                    data[offset + 2] = 97; // B
                    data[offset + 3] = 255; // A
                }
            }
                
            map.addImage('gradient', {width: width, height: width, data: data});
                
            map.addLayer({
                "id": "points",
                "type": "symbol",
                "source": {
                    "type": "geojson",
                    "data": {
                        "type": "FeatureCollection",
                        "features": [{
                            "type": "Feature",
                            "geometry": {
                                "type": "Point",
                                "coordinates": [map.getCenter().lng, map.getCenter().lat]
                            }
                        }]
                    }
                },
                "layout": {
                    "icon-image": "gradient"
                }
            });
        });
    </script>
</body>
</html>