百度地图GeoUtils示例

简介百度地图JavaScript开源库，是一套基于百度地图API二次开发的开源的代码库。目前提供多个lib库，帮助开发者快速实现在地图上添加Marker、自定义信息窗口、标注相关开发、区域限制设置、几何运算、实时交通、检索与公交驾车查询、鼠标绘制工具等功能。几何运算GeoUtils类提供若干几何算法，用来帮助用户判断点与矩形、圆形、多边形线、多边形面的关系,并提供计算折线长度和多边形...

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风神修罗使

7187人浏览 · 2018-09-05 22:39:24

风神修罗使 · 2018-09-05 22:39:24 发布

简介

百度地图JavaScript开源库，是一套基于百度地图API二次开发的开源的代码库。目前提供多个lib库，帮助开发者快速实现在地图上添加Marker、自定义信息窗口、标注相关开发、区域限制设置、几何运算、实时交通、检索与公交驾车查询、鼠标绘制工具等功能。

几何运算

GeoUtils类提供若干几何算法，用来帮助用户判断点与矩形、圆形、多边形线、多边形面的关系,并提供计算折线长度和多边形的面积的公式。主入口类是GeoUtils。

GeoUtils.html

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>GeoUtils示例</title>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=1.2"></script>
<script type="text/javascript" src="http://api.map.baidu.com/library/GeoUtils/1.2/src/GeoUtils_min.js"></script>
<style type="text/css">
        table{
            font-size:14px;
        }
</style>
</head>
<body>
<div style="float:left;width:600px;height:500px;border:1px solid gray" id="container">
</div>
<div style="float:left;width:300px;height:500px;border:1px solid gray" id="control">
    <table style="width:100%;">
    <tr>
        <td colspan="2">
            点与矩形的关系:
        </td>
    </tr>
    <tr>
        <td>
            <input type="button" value="点在矩形内" onclick="ptInRect()"/>
        </td>
        <td>
            <input type="button" value="点在矩形外" onclick="ptOutRect()"/>
        </td>
    </tr>
    <tr>
        <td>
            <br/>
        </td>
    </tr>
    <tr>
        <td colspan="2">
            点与圆形的关系:
        </td>
    </tr>
    <tr>
        <td>
            <input type="button" value="点在圆形内" onclick="ptInCircle()"/>
        </td>
        <td>
            <input type="button" value="点在圆形外" onclick="ptOutCircle()"/>
        </td>
    </tr>
    <tr>
        <td>
            <br/>
        </td>
    </tr>
    <tr>
        <td colspan="2">
            计算折线长度:
        </td>
    </tr>
    <tr>
        <td>
            <input type="button" value="参数为折线" onclick="computeLenByPolyine()"/>
        </td>
        <td>
            <input type="button" value="参数为点数组" onclick="computeLenByArray()"/>
        </td>
    </tr>
    <tr>
        <td>
            <br/>
        </td>
    </tr>
    <tr>
        <td colspan="2">
            计算多边形面积:
        </td>
    </tr>
    <tr>
        <td>
            <input type="button" value="参数为多边形" onclick="computeAreaByPolygon()"/>
        </td>
        <td>
            <input type="button" value="参数为点数组" onclick="computeAreaByArray()"/>
        </td>
    </tr>
    <tr>
        <td>
            <br/>
        </td>
    </tr>
    <tr>
        <td colspan="2">
            判断点是否在折线上:
        </td>
    </tr>
    <tr>
        <td>
            <input type="button" value="点在折线上" onclick="ptOnPolyline()"/>
        </td>
        <td>
            <input type="button" value="点在折线外" onclick="ptOutPolyline()"/>
        </td>
    </tr>
    <tr>
        <td>
            <br/>
        </td>
    </tr>
    <tr>
        <td colspan="2">
            判断点是否在多边形内:
        </td>
    </tr>
    <tr>
        <td>
            <input type="button" value="点在多边形内" onclick="ptInPolygon()"/>
        </td>
        <td>
            <input type="button" value="点在多边形外" onclick="ptOutPolygon()"/>
        </td>
    </tr>
    </table>
</div>
</body>
</html>
<script type="text/javascript">
    var map = new BMap.Map("container");
    var pt = new BMap.Point(116.404, 39.915);
    map.centerAndZoom(pt, 16);
    map.enableScrollWheelZoom();//开启滚动缩放
    map.enableContinuousZoom();//开启缩放平滑
    //点在矩形内
    function ptInRect(){
        var pt = new BMap.Point(116.404, 39.915);//测试点
        var pt1 = new BMap.Point(116.400, 39.910);//西南脚点
        var pt2 = new BMap.Point(116.410, 39.920);//东北脚点
        var bds = new BMap.Bounds(pt1, pt2); //测试Bounds对象
        var result = BMapLib.GeoUtils.isPointInRect(pt, bds);
        if(result == true){
            alert("点在矩形内");
        } else {
            alert("点在矩形外")
        }
        //演示：将点与矩形添加到地图上
        map.clearOverlays();
        var mkr = new BMap.Marker(pt);
        var pts = [];
        //bds的四个脚点坐标
        var leftTop = new BMap.Point(pt1.lng, pt2.lat);
        var rightTop = new BMap.Point(pt2.lng, pt2.lat);
        var leftBottom = new BMap.Point(pt1.lng, pt1.lat);
        var rightBottom = new BMap.Point(pt2.lng, pt1.lat);
        pts.push(leftTop);
        pts.push(rightTop);
        pts.push(rightBottom);
        pts.push(leftBottom);
        var rect = new BMap.Polygon(pts);
        map.addOverlay(mkr);//添加测试点
        map.addOverlay(rect);//添加测试矩形
    }
    //点在矩形外
    function ptOutRect(){
        var pt = new BMap.Point(116.398, 39.915);//测试点
        var pt1 = new BMap.Point(116.400, 39.910);//西南脚点
        var pt2 = new BMap.Point(116.410, 39.920);//东北脚点
        var bds = new BMap.Bounds(pt1, pt2); //测试Bounds对象
        var result = BMapLib.GeoUtils.isPointInRect(pt, bds);
        if(result == true){
            alert("点在矩形内");
        } else {
            alert("点在矩形外")
        }
        //演示：将点与矩形添加到地图上
        map.clearOverlays();
        var mkr = new BMap.Marker(pt);
        var pts = [];
        //bds的四个脚点坐标
        var leftTop = new BMap.Point(pt1.lng, pt2.lat);
        var rightTop = new BMap.Point(pt2.lng, pt2.lat);
        var leftBottom = new BMap.Point(pt1.lng, pt1.lat);
        var rightBottom = new BMap.Point(pt2.lng, pt1.lat);
        pts.push(leftTop);
        pts.push(rightTop);
        pts.push(rightBottom);
        pts.push(leftBottom);
        var rect = new BMap.Polygon(pts);
        map.addOverlay(mkr);//添加测试点
        map.addOverlay(rect);//添加测试矩形
    }
    //点在圆内
    function ptInCircle(){
        var pt = new BMap.Point(116.404, 39.915);//测试点
        var c = new BMap.Point(116.404, 39.915); //圆心
        var circle = new BMap.Circle(c, 500);//测试圆
        var result = BMapLib.GeoUtils.isPointInCircle(pt, circle);
        if(result == true){
            alert("点在圆形内");
        } else {
            alert("点在圆形外")
        }
        //演示：将点与圆形添加到地图上
        map.clearOverlays();
        var mkr = new BMap.Marker(pt);
        map.addOverlay(mkr);
        map.addOverlay(circle);
    }
    //点在圆外
    function ptOutCircle(){
        var pt = new BMap.Point(116.396, 39.915);//测试点
        var c = new BMap.Point(116.404, 39.915); //圆心
        var circle = new BMap.Circle(c, 500);//测试圆
        var result = BMapLib.GeoUtils.isPointInCircle(pt, circle);
        if(result == true){
            alert("点在圆形内");
        } else {
            alert("点在圆形外")
        }
        //演示：将点与圆形添加到地图上
        map.clearOverlays();
        var mkr = new BMap.Marker(pt);
        map.addOverlay(mkr);
        map.addOverlay(circle);
    }
    //计算长度，参数为折线
    function computeLenByPolyine(){
        var pts = [];
        var pt1 = new BMap.Point(116.400,39.910);
        var pt2 = new BMap.Point(116.402,39.912);
        var pt3 = new BMap.Point(116.403,39.914);
        var pt4 = new BMap.Point(116.404,39.917);
        var pt5 = new BMap.Point(116.406,39.918);
        pts.push(pt1);
        pts.push(pt2);
        pts.push(pt3);
        pts.push(pt4);
        pts.push(pt5);
        var ply = new BMap.Polyline(pts);
        var dis = BMapLib.GeoUtils.getPolylineDistance(ply);
        alert("共" + dis.toFixed(2) + "米");
        //演示：将线添加到地图上
        map.clearOverlays();
        map.addOverlay(ply);
    }
    //计算长度，参数为点数组
    function computeLenByArray(){
        var pts = [];
        var pt1 = new BMap.Point(116.400,39.910);
        var pt2 = new BMap.Point(116.402,39.912);
        var pt3 = new BMap.Point(116.403,39.914);
        var pt4 = new BMap.Point(116.404,39.917);
        var pt5 = new BMap.Point(116.406,39.918);
        pts.push(pt1);
        pts.push(pt2);
        pts.push(pt3);
        pts.push(pt4);
        pts.push(pt5);
        var dis = BMapLib.GeoUtils.getPolylineDistance(pts);
        alert("共" + dis.toFixed(2) + "米");
        //演示：将线添加到地图上
        var ply = new BMap.Polyline(pts, {strokeColor: "red", strokeStyle:"dashed"});
        map.clearOverlays();
        map.addOverlay(ply);
    }
    //计算面积，参数为多边形
    function computeAreaByPolygon(){
        var pts = [];
        var pt1 = new BMap.Point(116.395, 39.910);
        var pt2 = new BMap.Point(116.394, 39.918);
        var pt3 = new BMap.Point(116.396, 39.919);
        var pt4 = new BMap.Point(116.404, 39.920);
        var pt5 = new BMap.Point(116.406, 39.913);
        pts.push(pt1);
        pts.push(pt2);
        pts.push(pt3);
        pts.push(pt4);
        pts.push(pt5);
        var ply = new BMap.Polygon(pts);
        var area = BMapLib.GeoUtils.getPolygonArea(ply);
        alert("共" + area.toFixed(2) + "平方米");
        //演示：将面添加到地图上
        map.clearOverlays();
        map.addOverlay(ply);
    }
    //计算面积，参数为数组
    function computeAreaByArray(){
        var pts = [];
        var pt1 = new BMap.Point(116.395, 39.910);
        var pt2 = new BMap.Point(116.394, 39.918);
        var pt3 = new BMap.Point(116.396, 39.919);
        var pt4 = new BMap.Point(116.404, 39.920);
        var pt5 = new BMap.Point(116.406, 39.913);
        pts.push(pt1);
        pts.push(pt2);
        pts.push(pt3);
        pts.push(pt4);
        pts.push(pt5);
        var area = BMapLib.GeoUtils.getPolygonArea(pts);
        alert("共" + area.toFixed(2) + "平方米");
        //演示：将面添加到地图上
        var ply = new BMap.Polygon(pts, {strokeColor: "red", strokeStyle:"dashed", fillColor:"gray"});
        map.clearOverlays();
        map.addOverlay(ply);
    }
    //点在折线上
    function ptOnPolyline(){
        var pts = [];
        var pt1 = new BMap.Point(116.395, 39.910);
        var pt2 = new BMap.Point(116.405, 39.920);
        var pt3 = new BMap.Point(116.410, 39.920);
        pts.push(pt1);
        pts.push(pt2);
        pts.push(pt3);
        var ply = new BMap.Polyline(pts);
        var pt = new BMap.Point(116.400, 39.915);
        var result = BMapLib.GeoUtils.isPointOnPolyline(pt, ply);
        if(result == true){
            alert("点在折线上");
        } else {
            alert("点在折线外")
        }
        map.clearOverlays();
        var mkr = new BMap.Marker(pt);
        map.addOverlay(mkr);
        map.addOverlay(ply);
    }
    //点在折线外
    function ptOutPolyline(){
        var pts = [];
        var pt1 = new BMap.Point(116.395, 39.910);
        var pt2 = new BMap.Point(116.405, 39.920);
        var pt3 = new BMap.Point(116.410, 39.920);
        pts.push(pt1);
        pts.push(pt2);
        pts.push(pt3);
        var ply = new BMap.Polyline(pts);
        var pt = new BMap.Point(116.401, 39.915);
        var result = BMapLib.GeoUtils.isPointOnPolyline(pt, ply);
        if(result == true){
            alert("点在折线上");
        } else {
            alert("点在折线外")
        }
        map.clearOverlays();
        var mkr = new BMap.Marker(pt);
        map.addOverlay(mkr);
        map.addOverlay(ply);
    }
    //点在多边形内
    function ptInPolygon(){
        var pts = [];
        var pt1 = new BMap.Point(116.395, 39.910);
        var pt2 = new BMap.Point(116.394, 39.914);
        var pt3 = new BMap.Point(116.403, 39.920);
        var pt4 = new BMap.Point(116.402, 39.914);
        var pt5 = new BMap.Point(116.410, 39.913);
        pts.push(pt1);
        pts.push(pt2);
        pts.push(pt3);
        pts.push(pt4);
        pts.push(pt5);
        var ply = new BMap.Polygon(pts);
        var pt =new BMap.Point(116.400, 39.914);
        var result = BMapLib.GeoUtils.isPointInPolygon(pt, ply);
        if(result == true){
            alert("点在多边形内");
        } else {
            alert("点在多边形外")
        }
        //演示：将面添加到地图上
        map.clearOverlays();
        var mkr = new BMap.Marker(pt);
        map.addOverlay(mkr);
        map.addOverlay(ply);
    }
    //点在多边形外
    function ptOutPolygon(){
        var pts = [];
        var pt1 = new BMap.Point(116.395, 39.910);
        var pt2 = new BMap.Point(116.394, 39.914);
        var pt3 = new BMap.Point(116.396, 39.919);
        var pt4 = new BMap.Point(116.406, 39.920);
        var pt5 = new BMap.Point(116.410, 39.913);
        pts.push(pt1);
        pts.push(pt2);
        pts.push(pt3);
        pts.push(pt4);
        pts.push(pt5);
        var ply = new BMap.Polygon(pts);
        var pt =new BMap.Point(116.410, 39.915);
        var result = BMapLib.GeoUtils.isPointInPolygon(pt, ply);
        if(result == true){
            alert("点在多边形内");
        } else {
            alert("点在多边形外")
        }
        //演示：将面添加到地图上
        map.clearOverlays();
        var mkr = new BMap.Marker(pt);
        map.addOverlay(mkr);
        map.addOverlay(ply);
    }
</script>