小贝子编程

如何更改openlayer 6视图中心



<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<link rel="stylesheet" href="https://openlayers.org/en/v6.4.3/css/ol.css" type="text/css">
<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v6.4.3/build/ol.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.6.1/proj4.js"></script>
<style>
html, body, .map {
margin: 0;
padding: 0;
width: 99%;
height: 95%;
}
</style>
</head>
<body>
<div id="map" class="map"></div> 
<div id="mouse-position"></div>
<script>
proj4.defs("EPSG:32643","+proj=utm +zone=43 +datum=WGS84 +units=m +no_defs");
ol.proj.proj4.register(proj4);
ol.proj.get("EPSG:32643").setExtent([291627, 904686, 958569, 1426831]);
var projection = new ol.proj.Projection({
code: 'EPSG:32643',
extent: [291627,904686,958569,1426831],
});

var mousePositionControl = new ol.control.MousePosition({
coordinateFormat: ol.coordinate.createStringXY(4),
projection: projection,//'EPSG:32643',
// comment the following two lines to have the mouse position
// be placed within the map.
className: 'custom-mouse-position',
target: document.getElementById('mouse-position'),
undefinedHTML: '&nbsp;',
});
var scaleLine = new ol.control.ScaleLine({
units: 'metric',
});

var map = new ol.Map({
controls: ol.control.defaults().extend([mousePositionControl,scaleLine]),
target: 'map',
layers: [    
new ol.layer.Tile({
source: new ol.source.XYZ({
url: "http://103.10.168.74:8081/tms/1.0.0/district/distgrid" + "/{z}/{x}/{-y}.png",
projection:projection,
tileGrid: ol.tilegrid.createXYZ({
extent: [291627, 904686, 958569, 1426831],
maxResolution: 2605.2421875,
tileSize: [256, 256],
maxZoom: 10,
}),
}),
}),
new ol.layer.Vector({
source: new ol.source.Vector({  
features: [new ol.Feature({
geometry: new ol.geom.Point([614971.473,1218630.894]),
})],
}),
renderBuffer: 200,
style: new ol.style.Style({
image: new ol.style.Icon({
anchor: [0.5, 46],
anchorXUnits: 'fraction',
anchorYUnits: 'pixels',
src: 'https://openlayers.org/en/latest/examples/data/icon.png'
})
})
}),
new ol.layer.Vector({
source: new ol.source.Vector({
features: [
new ol.Feature({
geometry: new ol.geom.Point([716446.977962414,942574.737260181]),
})
]
})
}) 
],
view: new ol.View({
projection: projection, 
units:"metric",
zoom:1,
maxResolution:2605.2421875,
center:[654496.136597752,1155181.26900064],
numZoomLevels:13,        
constrainOnlyCenter: true,
maxZoom:10,
minZoom:1,
})
});

mousePositionControl.setProjection(projection);
</script>
</body>
</html>

我添加了一个矢量层&ol6中的瓦片层(mapnik&mapproxy(。但投影有问题，两层相距甚远。我的代码是

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<link rel="stylesheet" href="https://openlayers.org/en/v6.4.3/css/ol.css" type="text/css">
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v6.4.3/build/ol.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.6.1/proj4.js"></script>
<style>
html, body, .map {
margin: 0;
padding: 0;
width: 99%;
height: 99%;
border:1px solid #ccc;
}
</style>
</head>
<body>
<div id="map" class="map"></div>
<script>
proj4.defs("EPSG:32643","+proj=utm +zone=43 +datum=WGS84 +units=m +no_defs");
ol.proj.proj4.register(proj4);
//-----vector lyr-----
var london = new ol.Feature({
geometry: new ol.geom.Point(ol.proj.fromLonLat([8.5149092,76.9527723])),
}); 
london.setStyle(
new ol.style.Style({
image: new  ol.style.Icon({
color: '#4271AE',
crossOrigin: 'anonymous',
src: 'https://openlayers.org/en/latest/examples/data/icon.png',
scale: 0.5,
}),
})
);
var vectorSource = new ol.source.Vector({
features: [london],
projection: "EPSG:32643",
});
var vectorLayer = new ol.layer.Vector({
source: vectorSource,
});
//-----vector lyr-----

var map = new ol.Map({
target: 'map',
layers: [    
new ol.layer.Tile({
source: new ol.source.XYZ({
url: "http://127.0.01:8080/tms/1.0.0/district/distgrid" + "/{z}/{x}/{-y}.png",
projection: "EPSG:32643",
}),
}), 
vectorLayer    
],
view: new ol.View({
projection: "EPSG:32643",
units:"m",
zoom:1,
maxZoom:10,
minZoom:1,
center:[8.5149092,76.9527723],
})
});
map.getView().fit(vectorSource.getExtent());
map.getView().setZoom(map.getView().getZoom() - 10);
//map.getView().setCenter(ol.proj.transform([8.5149092,76.9527723], 'EPSG:32643', 'EPSG:32643'));
</script>
</body>
</html>

我试着改变地图的中心，但不起作用。我的地图是以米为单位的UTM 43N&EPSG:32643。我在ol2中使用的范围是2916279046869585691426831&最大分辨率：2605.2421875。我也尝试过将tileGrid添加到tile层，但也不起作用。

var resolutions = [
2605.2421875,
// don't know how to find resolution
];
tileGrid: new ol.tilegrid.TileGrid({
extent: [291627,904686,958569,1426831],
resolutions: resolutions,
tileSize: [256, 256],
}),

您的几何体和中心需要与视图处于同一投影中

geometry: new ol.geom.Point(ol.proj.fromLonLat([8.5149092, 76.9527723], "EPSG:32643")),

center: ol.proj.fromLonLat([8.5149092, 76.9527723], "EPSG:32643"),

您不需要在vectorSource上设置投影。

如果您的平铺网格具有缩放级别0到10，则可以使用设置tileGrid

tileGrid: ol.tilegrid.createXYZ({
extent: [291627, 904686, 958569, 1426831],
maxResolution: 2605.2421875,
tileSize: [256, 256],
maxZoom: 10,
}),

您可能还想设置投影范围以匹配

ol.proj.get("EPSG:32643").setExtent([291627, 904686, 958569, 1426831]);

对于原点位于平铺网格左下角的TMS源，OpenLayers希望最大分辨率与网格范围的高度匹配，但在您的情况下，它与宽度匹配。解决这个问题的一种方法是在高度等于宽度的情况下使用更大的范围。添加OSM层表明它现在处于正确的位置。

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<link rel="stylesheet" href="https://openlayers.org/en/v6.4.3/css/ol.css" type="text/css">
<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v6.4.3/build/ol.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.6.1/proj4.js"></script>
<style>
html, body, .map {
margin: 0;
padding: 0;
width: 99%;
height: 95%;
}
</style>
</head>
<body>
<div id="map" class="map"></div> 
<div id="mouse-position"></div>
<script>
proj4.defs("EPSG:32643","+proj=utm +zone=43 +datum=WGS84 +units=m +no_defs");
ol.proj.proj4.register(proj4);
ol.proj.get("EPSG:32643").setExtent([291627, 904686, 958569, 1426831]);
var projection = new ol.proj.Projection({
code: 'EPSG:32643',
extent: [291627,904686,958569,1426831],
});

var mousePositionControl = new ol.control.MousePosition({
coordinateFormat: ol.coordinate.createStringXY(4),
projection: projection,//'EPSG:32643',
// comment the following two lines to have the mouse position
// be placed within the map.
className: 'custom-mouse-position',
target: document.getElementById('mouse-position'),
undefinedHTML: '&nbsp;',
});
var scaleLine = new ol.control.ScaleLine({
units: 'metric',
});

var extent = [291627, 904686, 958569, 1426831];
var fullExtent = [extent[0], extent[1], extent[2], extent[1] + extent[2] - extent[0]];
var map = new ol.Map({
controls: ol.control.defaults().extend([mousePositionControl,scaleLine]),
target: 'map',
layers: [   
new ol.layer.Tile({
source: new ol.source.XYZ({
url: "http://103.10.168.74:8081/tms/1.0.0/district/distgrid" + "/{z}/{x}/{-y}.png",
projection:projection,
tileGrid: ol.tilegrid.createXYZ({
extent: fullExtent,
maxResolution: 2605.2421875,
tileSize: [256, 256],
maxZoom: 10,
}),
}),
}),
new ol.layer.Tile({
source: new ol.source.OSM(),
opacity: 0.5,
}),
new ol.layer.Vector({
source: new ol.source.Vector({  
features: [new ol.Feature({
geometry: new ol.geom.Point([614971.473,1218630.894]),
})],
}),
renderBuffer: 200,
style: new ol.style.Style({
image: new ol.style.Icon({
anchor: [0.5, 46],
anchorXUnits: 'fraction',
anchorYUnits: 'pixels',
src: 'https://openlayers.org/en/latest/examples/data/icon.png'
})
})
}),
new ol.layer.Vector({
source: new ol.source.Vector({
features: [
new ol.Feature({
geometry: new ol.geom.Point([716446.977962414,942574.737260181]),
})
]
})
}) 
],
view: new ol.View({
projection: projection, 
units:"metric",
zoom:1,
maxResolution:2605.2421875,
center:[654496.136597752,1155181.26900064],
numZoomLevels:13,        
constrainOnlyCenter: true,
maxZoom:10,
minZoom:1,
})
});

mousePositionControl.setProjection(projection);
</script>
</body>
</html>

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