1.5.3.2.18.2 聚点图
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2023-12-01
AnimatedCluster 是一个提供动态标识聚类功能的 OpenLayers 插件。
下载 AnimatedCluster 插件
1.进入 github 下载 AnimatedCluster,下载地址为:
https://github.com/Viglino/OL3-AnimatedCluster
2.<script>标签引入:
<script src="animatedCluster.js"></script>;
var clusterSource = new ol.source.Cluster({
//聚合点之间的最小距离
distance: 40,
source: new ol.source.Vector(),
//水平不平铺
wrapX: false
});
//实例化AnimatedCluster插件对象图层类
var clusterLayer = new ol.layer.AnimatedCluster({
name: 'Cluster',
source: clusterSource,
//动画持续时间
animationDuration: 700,
//传入下方getStyle函数作为style属性
style: getStyle
});
map.addLayer(clusterLayer);
//为聚合对象添加要素
function addFeatures(nb) {
var features = [];
var xmax = 130, xmin = 80, ymax = 50, ymin = 20;
for (var i = 0; i < nb; ++i) {
features[i] = new ol.Feature(new ol.geom.Point([Math.floor(Math.random() * (xmax - xmin + 1) + xmin), Math.floor(Math.random() * (ymax - ymin + 1) + ymin)]));
features[i].set('id', i);
}
clusterSource.getSource().clear();
clusterSource.getSource().addFeatures(features);
}
addFeatures(2000);
});
根据要素的长度来确定绘制聚点的样式。
function getStyle(feature) {
var styleCache = {};
var size = feature.get('features').length;
var style = styleCache[size];
if (!style) {
var color = size > 25 ? "192,0,0" : size > 8 ? "255,128,0" : "0,128,0";
var radius = Math.max(8, Math.min(size * 0.75, 20));
var dash = 2 * Math.PI * radius / 6;
dash = [0, dash, dash, dash, dash, dash, dash];
style = styleCache[size] = [new ol.style.Style({
image: new ol.style.Circle({
radius: radius,
stroke: new ol.style.Stroke({
color: "rgba(" + color + ",0.5)",
width: 15,
lineDash: dash,
lineCap: "butt"
}),
fill: new ol.style.Fill({
color: "rgba(" + color + ",1)"
})
}),
text: new ol.style.Text({
text: size.toString(),
fill: new ol.style.Fill({
color: '#fff'
})
})
})
];
}
return style;
}