高德地图 JS API示例-坐标系转换-经纬度平面像素坐标

<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <title>坐标变换（经纬度 <-> 平面坐标）</title>
    <link rel="stylesheet" href="https://a.amap.com/jsapi_demos/static/demo-center/css/demo-center.css"/>
    <style>
        html,body,#container{
            height:100%;
            width:100%;
        }
        .btn{
            width:14em;
            margin-left:3.2rem;  
            margin-top: 0.8rem; 
        }
    </style>
</head>
<body>
<div id="container"></div>
<div class="input-card">
    <label style='color:grey'>请输入或点击地图获取经纬度：(经度,纬度)</label>
    <div class="input-item">
            <div class="input-item-prepend">
                <span class="input-item-text" >经纬度</span>
            </div>
            <input id='lnglat' type="text" value="116.512402,39.867054">
            
    </div>
    <label style='color:grey'>请输入平面地图像素坐标：(x,y)</label>
    
    <div class="input-item">
            <div class="input-item-prepend">
                <span class="input-item-text">平面坐标</span>
            </div>
            <input id='pixel' type="text">
    </div>
    <div>
        <input id="lnglat2pixel" type="button" class="btn" value="经纬度 -> 平面像素坐标" />
        <input id="pixel2lnglat" type="button" class="btn" value="平面像素坐标 -> 经纬度" />
    </div>
</div>

<script type="text/javascript" src="https://webapi.amap.com/maps?v=1.4.15&key=您申请的key值&plugin=AMap.Geocoder"></script>
<script type="text/javascript">
    var map = new AMap.Map("container", {
        resizeEnable: true
    });

    var $ = function(elementId){
        return document.getElementById(elementId);
    };
    var lnglatInput = $('lnglat');
    var pixelInput = $('pixel');
    
    // 经纬度坐标转成平面像素坐标
    function lnglat2pixel() {
        if(!lnglatInput.value) return
        var zoom = map.getZoom(); 
        var inputVal = lnglatInput.value.split(',');
        var lnglat = new AMap.LngLat(inputVal[0], inputVal[1]);
        var pixel = map.lnglatToPixel(lnglat,zoom);
        pixel.x = parseInt(pixel.x);
        pixel.y = parseInt(pixel.y);
        pixelInput.value = pixel;
    }

    // 平面像素坐标转成经纬度坐标
    function pixel2lnglat() {
        if(!pixelInput.value) return
        var zoom = map.getZoom(); 
        var inputVal = pixelInput.value.split(',');
        var pixel = new AMap.Pixel(inputVal[0],inputVal[1]);
        var lnglat = map.pixelToLngLat(pixel,zoom);
        lnglatInput.value = lnglat;
    }
    lnglat2pixel();
    map.on( 'click',  function (e) {
        lnglatInput.value = e.lnglat.toString();
    });
    document.getElementById("lnglat2pixel").onclick = lnglat2pixel;
    document.getElementById("pixel2lnglat").onclick = pixel2lnglat;

</script>
</body>
</html>
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