如何更改 openlayer 6 视图中心？
How to change openlayer 6 view center?
<!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: ' ',
});
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>
我在 ol6（mapnik 和 maproxy）中添加了一个矢量图层和一个图块层。但是投影有问题，两层相距很远。我的密码是
<!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>
我试过改变地图的中心，但没用。我的地图在 'meters' UTM 43N & EPSG: 32643。
我在ol2中使用的范围是291627,904686,958569,1426831 & maxResolution:2605.2421875。我也尝试将 tileGrid 添加到 tile 层，但它也不起作用。
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],
}),
您的几何图形和中心需要与视图在同一投影中
geometry: new ol.geom.Point(ol.proj.fromLonLat([8.5149092, 76.9527723], "EPSG:32643")),
center: ol.proj.fromLonLat([8.5149092, 76.9527723], "EPSG:32643"),
不需要在vectorSource上设置投影。
如果您的图块网格的缩放级别为 0 到 10 tileGrid 可以使用
进行设置
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]);
对于原点位于图块网格左下角的 TMS 源，OpenLayers 期望 maxResolution 与网格范围的高度相匹配，但在您的情况下它与宽度相匹配。解决该问题的一种方法是使用高度等于宽度的更大范围。添加 OSM 层显示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: ' ',
});
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>
<!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: ' ',
});
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>
我在 ol6（mapnik 和 maproxy）中添加了一个矢量图层和一个图块层。但是投影有问题，两层相距很远。我的密码是
<!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>
我试过改变地图的中心，但没用。我的地图在 'meters' UTM 43N & EPSG: 32643。 我在ol2中使用的范围是291627,904686,958569,1426831 & maxResolution:2605.2421875。我也尝试将 tileGrid 添加到 tile 层，但它也不起作用。
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],
}),
您的几何图形和中心需要与视图在同一投影中
geometry: new ol.geom.Point(ol.proj.fromLonLat([8.5149092, 76.9527723], "EPSG:32643")),
center: ol.proj.fromLonLat([8.5149092, 76.9527723], "EPSG:32643"),
不需要在vectorSource上设置投影。
如果您的图块网格的缩放级别为 0 到 10 tileGrid 可以使用
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]);
对于原点位于图块网格左下角的 TMS 源，OpenLayers 期望 maxResolution 与网格范围的高度相匹配，但在您的情况下它与宽度相匹配。解决该问题的一种方法是使用高度等于宽度的更大范围。添加 OSM 层显示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: ' ',
});
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>