mapv
Version:
a library of geography visualization
90 lines (69 loc) • 2.56 kB
HTML
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
html, body {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
#map {
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<div id="map"></div>
<canvas id="canvas"></canvas>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=1XjLLEhZhQNUzd93EjU5nOGQ"></script>
<script type="text/javascript" src="../build/mapv.js"></script>
<script type="text/javascript">
// 百度地图API功能
var map = new BMap.Map("map", {
enableMapClick: false
}); // 创建Map实例
map.centerAndZoom(new BMap.Point(105.403119, 38.028658), 5); // 初始化地图,设置中心点坐标和地图级别
map.enableScrollWheelZoom(true); // 开启鼠标滚轮缩放
map.setMapStyle({
style: 'midnight'
});
var randomCount = 300;
var data = [];
var citys = ["北京","天津","上海","重庆","石家庄","太原","呼和浩特","哈尔滨","长春","沈阳","济南","南京","合肥","杭州","南昌","福州","郑州","武汉","长沙","广州","南宁","西安","银川","兰州","西宁","乌鲁木齐","成都","贵阳","昆明","拉萨","海口"];
// 构造数据
while (randomCount--) {
var cityCenter = mapv.utilCityCenter.getCenterByCityName(citys[parseInt(Math.random() * citys.length)]);
data.push({
lng: cityCenter.lng - 2 + Math.random() * 4,
lat: cityCenter.lat - 2 + Math.random() * 4,
count: 30 * Math.random()
});
}
var canvasLayer = new mapv.baiduMapCanvasLayer({
map: map,
update: update
});
function update() {
var ctx = this.canvas.getContext("2d");
mapv.canvasClear(ctx);
for (var i = 0; i < data.length; i++) {
var pixel = map.pointToPixel(new BMap.Point(data[i].lng, data[i].lat));
data[i].x = pixel.x;
data[i].y = pixel.y;
}
var options = {
fillStyle: 'rgba(255, 50, 50, 0.5)',
max: 30,
radius: 13,
draw: 'bubble'
}
mapv.canvasPoint.draw(ctx, data, options);
}
</script>
</body>
</html>