使用Lat/Lon和半径在OpenLayers中绘制圆
我正在绘制IGC轨迹,并希望根据路线上的某些检查点添加圆圈。我尝试使用此解决方案: 但我不知道如何在这样的代码中实现它: 基本上是这样的:使用Lat/Lon和半径在OpenLayers中绘制圆,openlayers,Openlayers,我正在绘制IGC轨迹,并希望根据路线上的某些检查点添加圆圈。我尝试使用此解决方案: 但我不知道如何在这样的代码中实现它: 基本上是这样的: 如何添加圆 我能画出圆圈。我想我需要更多的代码结构来添加圆圈: 1.定义圆 2.添加圆特征 3.创建一个图层 4.将图层添加到地图中 我在这里又举了一个例子: 我对OpenLayer(和JavaScript)还不熟悉,但它的结构符合逻辑,易于复制 我的完整代码在这里。您只需添加IGC文件和API密钥: <!DOCTYPE html> <h
如何添加圆 我能画出圆圈。我想我需要更多的代码结构来添加圆圈: 1.定义圆 2.添加圆特征 3.创建一个图层 4.将图层添加到地图中 我在这里又举了一个例子: 我对OpenLayer(和JavaScript)还不熟悉,但它的结构符合逻辑,易于复制 我的完整代码在这里。您只需添加IGC文件和API密钥:
<!DOCTYPE html>
<html>
<head>
<title>IGC example</title>
<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://openlayers.org/en/v3.10.1/css/ol.css" type="text/css">
<script src="http://openlayers.org/en/v3.10.1/build/ol.js"></script>
</head>
<body>
<div class="container-fluid">
<div class="row-fluid">
<div class="span12">
<div id="map" class="map"></div>
<input id="time" type="range" value="0" steps="1" />
<div class="span4 offset4 pull-right">
<div id="info" class="alert alert-success">
</div>
</div>
</div>
</div>
</div>
<script>
// Geometries
var point = new ol.geom.Circle(ol.proj.transform([-96.1543889, 29.2542778], 'EPSG:4326', 'EPSG:3857'), 30000 );
var circle = new ol.geom.Circle(ol.proj.transform([-96.1543889, 29.2542778], 'EPSG:4326', 'EPSG:3857'), 10000 );
// Features
var pointFeature = new ol.Feature(point);
var circleFeature = new ol.Feature(circle);
// Source and vector layer
var vectorSource = new ol.source.Vector({
projection: 'EPSG:4326',
features: [pointFeature, circleFeature]
});
var style = new ol.style.Style({
fill: new ol.style.Fill({
color: 'rgba(20, 100, 240, 0.3)'
}),
stroke: new ol.style.Stroke({
width: 3,
color: 'rgba(0, 100, 240, 0.8)'
}),
image: new ol.style.Circle({
fill: new ol.style.Fill({
color: 'rgba(55, 200, 150, 0.5)'
}),
stroke: new ol.style.Stroke({
width: 10,
color: 'rgba(55, 200, 150, 0.8)'
}),
radius: 7
}),
});
var vectorLayer = new ol.layer.Vector({
source: vectorSource,
style: style
});
var colors = {
'MH': 'rgba(0, 0, 255, 0.7)',
'BW': 'rgba(0, 215, 255, 0.7)',
'Sylvain Dhonneur': 'rgba(0, 165, 255, 0.7)',
'Tom Payne': 'rgba(0, 255, 255, 0.7)',
'Ulrich Prinz': 'rgba(0, 215, 255, 0.7)'
};
var styleCache = {};
var styleFunction = function(feature, resolution) {
var color = colors[feature.get('PLT')];
var styleArray = styleCache[color];
if (!styleArray) {
styleArray = [new ol.style.Style({
stroke: new ol.style.Stroke({
color: color,
width: 3
})
})];
styleCache[color] = styleArray;
}
return styleArray;
};
var vectorSource = new ol.source.Vector();
var igcUrls = [
'BW.igc',
'MH.igc',
'data/igc/Sylvain-Dhonneur.igc',
'data/igc/Tom-Payne.igc',
'data/igc/Ulrich-Prinz.igc'
];
function get(url, callback) {
var client = new XMLHttpRequest();
client.open('GET', url);
client.onload = function() {
callback(client.responseText);
};
client.send();
}
var igcFormat = new ol.format.IGC();
for (var i = 0; i < igcUrls.length; ++i) {
get(igcUrls[i], function(data) {
var features = igcFormat.readFeatures(data,
{featureProjection: 'EPSG:3857'});
vectorSource.addFeatures(features);
});
}
var time = {
start: Infinity,
stop: -Infinity,
duration: 0
};
vectorSource.on('addfeature', function(event) {
var geometry = event.feature.getGeometry();
time.start = Math.min(time.start, geometry.getFirstCoordinate()[2]);
time.stop = Math.max(time.stop, geometry.getLastCoordinate()[2]);
time.duration = time.stop - time.start;
});
var wharton = [-96.1543889, 29.2542778]; // caution partner, read on...
// since we are using OSM, we have to transform the coordinates...
var whartonMercator = ol.proj.fromLonLat(wharton);
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM({
attributions: [
new ol.Attribution({
html: 'All maps © ' +
'<a href="http://www.opencyclemap.org/">OpenCycleMap</a>'
}),
ol.source.OSM.ATTRIBUTION
],
url: 'https://tile.thunderforest.com/cycle/{z}/{x}/{y}.png'
})
}),
new ol.layer.Vector({
source: vectorSource,
style: styleFunction
}),
vectorLayer
],
target: 'map',
controls: ol.control.defaults({
attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
collapsible: true
})
}),
view: new ol.View({
center: whartonMercator,
zoom: 9
})
});
var point = null;
var line = null;
var displaySnap = function(coordinate) {
var closestFeature = vectorSource.getClosestFeatureToCoordinate(coordinate);
var info = document.getElementById('info');
if (closestFeature === null) {
point = null;
line = null;
info.innerHTML = ' ';
} else {
var geometry = closestFeature.getGeometry();
var closestPoint = geometry.getClosestPoint(coordinate);
if (point === null) {
point = new ol.geom.Point(closestPoint);
} else {
point.setCoordinates(closestPoint);
}
var date = new Date(closestPoint[2] * 1000);
info.innerHTML =
closestFeature.get('PLT') + ' (' + date.toUTCString() + ')';
var coordinates = [coordinate, [closestPoint[0], closestPoint[1]]];
if (line === null) {
line = new ol.geom.LineString(coordinates);
} else {
line.setCoordinates(coordinates);
}
}
map.render();
};
map.on('pointermove', function(evt) {
if (evt.dragging) {
return;
}
var coordinate = map.getEventCoordinate(evt.originalEvent);
displaySnap(coordinate);
});
map.on('click', function(evt) {
displaySnap(evt.coordinate);
});
var imageStyle = new ol.style.Circle({
radius: 5,
fill: null,
stroke: new ol.style.Stroke({
color: 'rgba(255,0,0,0.9)',
width: 1
})
});
var strokeStyle = new ol.style.Stroke({
color: 'rgba(255,0,0,0.9)',
width: 1
});
map.on('postcompose', function(evt) {
var vectorContext = evt.vectorContext;
if (point !== null) {
vectorContext.setImageStyle(imageStyle);
vectorContext.drawPointGeometry(point);
}
if (line !== null) {
vectorContext.setFillStrokeStyle(null, strokeStyle);
vectorContext.drawLineStringGeometry(line);
}
});
var featureOverlay = new ol.layer.Vector({
source: new ol.source.Vector(),
map: map,
style: new ol.style.Style({
image: new ol.style.Circle({
radius: 5,
fill: new ol.style.Fill({
color: 'rgba(255,0,0,0.9)'
}),
stroke: null
})
})
});
document.getElementById('time').addEventListener('input', function() {
var value = parseInt(this.value, 10) / 100;
var m = time.start + (time.duration * value);
vectorSource.forEachFeature(function(feature) {
var geometry = /** @type {ol.geom.LineString} */ (feature.getGeometry());
var coordinate = geometry.getCoordinateAtM(m, true);
var highlight = feature.get('highlight');
if (highlight === undefined) {
highlight = new ol.Feature(new ol.geom.Point(coordinate));
feature.set('highlight', highlight);
featureOverlay.getSource().addFeature(highlight);
} else {
highlight.getGeometry().setCoordinates(coordinate);
}
});
map.render();
});
</script>
</body>
</html>
IGC示例
//几何学
变量点=新的ol.geom.Circle(ol.proj.transform([-96.1543889,29.2542778],'EPSG:4326','EPSG:3857'),30000);
变量圆=新的ol.geom.circle(ol.proj.transform([-96.1543889,29.2542778],'EPSG:4326','EPSG:3857'),10000);
//特征
var pointFeature=新的ol.特性(点);
var circleFeature=新的ol.特征(圆);
//源矢量层
var vectorSource=新的ol.source.Vector({
投影:‘EPSG:4326’,
特征:[点特征,圆特征]
});
var style=新的ol.style.style({
填充:新的ol.style.fill({
颜色:“rgba(20100240,0.3)”
}),
笔划:新的ol风格笔划({
宽度:3,
颜色:“rgba(0,100240,0.8)”
}),
图片:新ol.style.Circle({
填充:新的ol.style.fill({
颜色:“rgba(552001500.5)”
}),
笔划:新的ol风格笔划({
宽度:10,
颜色:“rgba(552001500.8)”
}),
半径:7
}),
});
var vectorLayer=新ol.layer.Vector({
来源:矢量源,
风格:风格
});
变量颜色={
‘MH’:‘rgba(0,025,0.7)’,
‘BW’:‘rgba(0,215,255,0.7)’,
“Sylvain Dhonneur”:“rgba(0,165,255,0.7)”,
“汤姆·佩恩”:“rgba(0255250.7)”,
‘Ulrich Prinz’:‘rgba(0,215,255,0.7)’
};
var styleCache={};
var styleFunction=函数(特性、分辨率){
var color=colors[feature.get('PLT');
var styleArray=styleCache[color];
if(!styleArray){
styleArray=[new ol.style.style({
笔划:新的ol风格笔划({
颜色:颜色,
宽度:3
})
})];
styleCache[color]=styleArray;
}
返回样式数组;
};
var vectorSource=new ol.source.Vector();
变量igcUrls=[
“BW.igc”,
“MH.igc”,
“data/igc/Sylvain Dhonneur.igc”,
“data/igc/Tom Payne.igc”,
“data/igc/Ulrich Prinz.igc”
];
函数get(url,回调){
var client=new XMLHttpRequest();
client.open('GET',url);
client.onload=函数(){
回调(client.responseText);
};
client.send();
}
var igcFormat=new ol.format.IGC();
对于(变量i=0;i