Arcgis api for javascript学习笔记-控制地图缩放比例尺范围(3.2X版本与4.6版本)

时间：2023-01-24 10:10:44

Ⅰ. 在3.X版本中，设置Map对象的 "maxScale" 和 "minScale" 属性

<!DOCTYPE html>

<html>

<head>

    <style type="text/css">

        html, body { margin: 0; padding: 0; height: 100%; width: 100%; }

        #viewDiv{ width:100%;height:100%; }

    </style>

    <link rel="stylesheet" href="https://js.arcgis.com/3.20/esri/css/esri.css">

    <script src="https://js.arcgis.com/3.20/"></script>

</head>

<body>

    <div id="viewDiv"></div>

    <script type="text/javascript">

        var SCALE_MIN = 500000;

        var SCALE_MAX = 6000000;

        var SCALE_DEFAULT = 3000000;

        require(["esri/map", "dojo/domReady!"], function(Map) {

            var map = new Map("viewDiv", {

                "scale": SCALE_DEFAULT,

                "maxScale": SCALE_MIN,

                "minScale": SCALE_MAX,

                "basemap": "topo"

            });

        });

    </script>

</body>

</html>

Ⅱ. 在4.X版本中，"mouse-wheel" 事件结合 evt.stopPropagation() 函数来实现

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8">

    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">

    <style>

        html, body, #viewDiv { padding: 0; margin: 0; height: 100%; width: 100%; }

    </style>

</head>

<body>

    <div id="viewDiv"></div>

    <link rel="stylesheet" href="https://js.arcgis.com/4.5/esri/css/main.css">

    <script type="text/javascript" src="https://js.arcgis.com/4.5/"></script>

    <script type="text/javascript">

        var SCALE_MIN = 500000;

        var SCALE_MAX = 6000000;

        var SCALE_DEFAULT = 3000000;

        require(["esri/Map", "esri/views/SceneView", "dojo/domReady!"], function (Map, SceneView) {

            var map = new Map({

                "basemap": "satellite",

                "ground": "world-elevation"

            });

            var view = new SceneView({

                "map": map,

                "scale": SCALE_DEFAULT,

                "container": "viewDiv",

                "center": [103.8000, 34.8000],

            });

            view.then(function(){

                view.on("double-click",function(evt){

                    evt.stopPropagation();

                });

                view.on("mouse-wheel",function(evt){

                    //evt.stopPropagation();

                    //鼠标滚轮缩小

                    if(evt.deltaY > 0 && view.scale > SCALE_MAX){

                        evt.stopPropagation();

                        return false;

                    }

                    //鼠标滚轮放大

                    else if(evt.deltaY < 0 && view.scale < SCALE_MIN){

                        evt.stopPropagation();

                        return false;

                    }

                    if((evt.deltaY > 0 && view.scale > SCALE_MAX) || (evt.deltaY < 0 && view.scale < SCALE_MIN)){

                        console.info(view.scale);

                        console.info(evt);

                    }

                });

            });

        });

    </script>

</body>

</html>

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