Question

	function huatuxing(result){
			var feature = new SuperMap.Feature.Vector();
			var zb=result.substring(1,result.length-1);
			var pointsArr=zb.split("],[");
			var points =[];
			for(var i=0;i<pointsArr.length;i++){
				var xyzb=pointsArr[i].split(",");
				var x=xyzb[0];
				var y=xyzb[1];
				points.push(new SuperMap.Geometry.Point(x,y));
			}
			var linearRings = new SuperMap.Geometry.LinearRing(points);
			var region = new SuperMap.Geometry.Polygon([linearRings]);
			var feature = new SuperMap.Feature.Vector(region);
			vectorLayer.addFeatures([feature]);
			var bound=feature.geometry.getBounds();
			map.zoomToExtent(bound);
		}

问题描述: 根据坐标画好图形以后不能直接对该图形放大吗??需要进行空间查询?? 前台老是报"Cannot read property 'wrapDateLine' of null" 这个错误

Answer 1

您好，您可以监听vector图层的featuresadded事件然后触发zoomTo事件。出现这个报错应该是和地图、图层初始化有关系。在官网范例中如果是在addData()中添加zoom地图的代码默认执行的时候也会报这个错误，但是删除数据重新加载数据后就是正常的了

在官网范例中参考这段代码，可以看到效果


<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title data-i18n="resources.title_vectorLayerData"></title>
<style type="text/css">
        body {
            margin: 0;
            overflow: hidden;
            background: #fff;
            width: 100%;
            height: 100%
        }

        #map {
            position: absolute;
            width: 100%;
            height: 100%;
        }

        #toolbar {
            position: absolute;
            top: 50px;
            right: 10px;
            text-align: center;
            z-index: 100;
            border-radius: 4px;
        }
    </style>
</head>
<body>
<div id="toolbar" class="panel panel-primary">
<div class='panel-heading'>
<h5 class='panel-title text-center' data-i18n="resources.text_basicVectorLayerData"></h5></div>
<div class='panel-body content'>
<input type="button" class="btn btn-default" data-i18n="[value]resources.text_input_value_addData" onclick="addData()"/>&nbsp;
<input type="button" class="btn btn-default" data-i18n="[value]resources.text_input_value_removeData" onclick="removeData()"/>
</div>
</div>
<div id="map"></div>
<script type="text/javascript" include="bootstrap,widgets" src="../js/include-web.js"></script>
<script type="text/javascript" exclude="iclient-classic" src="../../dist/classic/include-classic.js"></script>
<script type="text/javascript">
    var map, layer, dataAdded = false,
        host = window.isLocal ? window.server : "https://iserver.supermap.io",
        url = host + "/iserver/services/map-world/rest/maps/World";

    init();

    function init() {
        map = new SuperMap.Map("map", {
            controls: [
                new SuperMap.Control.Zoom(),
                new SuperMap.Control.Navigation(),
            ]
        });
        map.addControl(new SuperMap.Control.LayerSwitcher(), new SuperMap.Pixel(42, 80));
        layer = new SuperMap.Layer.TiledDynamicRESTLayer("World", url, null, {maxResolution: "auto"});
        layer.events.on({"layerInitialized": addLayer});
        vector = new SuperMap.Layer.Vector("vector");
        vector.events.on({'featuresadded':panTo})
    }
    function panTo(){
        console.log(1);
        var bounds = new SuperMap.Bounds(-150,25.857,-110,54.142);
        map.zoomToExtent(bounds,{closest:true});
    }
    function addLayer() {

        map.addLayers([layer, vector]);
        //显示地图范围
        map.setCenter(new SuperMap.LonLat(0, 0), 0);
    }

    function addData() {
        widgets.alert.clearAlert();
        if (!dataAdded) {
            vector.removeAllFeatures();
            //六边形
            var points2 = [
                    new SuperMap.Geometry.Point(-120, 54.142),
                    new SuperMap.Geometry.Point(-110, 40),
                    new SuperMap.Geometry.Point(-120, 25.857),
                    new SuperMap.Geometry.Point(-140, 25.857),
                    new SuperMap.Geometry.Point(-150, 40),
                    new SuperMap.Geometry.Point(-140, 54.142)

                ],
                linearRings = new SuperMap.Geometry.LinearRing(points2),
                region = new SuperMap.Geometry.Polygon([linearRings]);
            var polygonVector = new SuperMap.Feature.Vector(region);
            
            vector.addFeatures([ polygonVector]);
            
            dataAdded = true;
            
        } else {
            widgets.alert.showAlert(resources.msg_loadedData, true, 240);
        }
    }

    

    function removeData() {
        widgets.alert.clearAlert();
        dataAdded = false;
        vector.removeAllFeatures();
        vector.refresh();
    }

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

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