Dynamic Viewport
Documentation
This demo illustrates how to change the map’s viewport from code. Choose a continent using the drop-down menu under the map. In response to that, the map changes the visible area so that the chosen continent is displayed optimally. This is performed in code by calling the viewport(viewportCoordinates) method. After that, callback functions assigned to the centerChanged and zoomFactorChanged options are triggered. These functions place the current values of the map’s center and zoom factor in the text boxes under the map.
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var DemoApp = angular.module('DemoApp', ['dx']);
DemoApp.controller('DemoController', function DemoController($scope) {
$scope.zoomFactorValue = "1.00";
$scope.centerValue = "0.000, 46.036";
$scope.vectorMapOptions = {
layers: {
dataSource: DevExpress.viz.map.sources.world
},
bounds: [-180, 85, 180, -60],
onZoomFactorChanged: function (e) {
$scope.zoomFactorValue = e.zoomFactor.toFixed(2);
},
onCenterChanged: function (e) {
$scope.centerValue = e.center[0].toFixed(3) +
", " + e.center[1].toFixed(3);
}
};
$scope.chooseContinent = {
dataSource: viewportCoordinates,
width: 210,
displayExpr: "continent",
valueExpr: "coordinates",
value: viewportCoordinates[0].coordinates,
onValueChanged: function (data) {
$("#vector-map").dxVectorMap("instance").viewport(data.value);
}
};
$scope.zoomFactor = {
bindingOptions: {
value: "zoomFactorValue"
},
readOnly: true,
width: 210
};
$scope.center = {
bindingOptions: {
value: "centerValue"
},
readOnly: true,
width: 210
};
});
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.1.4/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.1.4/css/dx.light.css" />
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js"></script>
<script>window.angular || document.write(decodeURIComponent('%3Cscript src="js/angular.min.js"%3E%3C\/script%3E'))</script>
<script src="https://cdn3.devexpress.com/jslib/20.1.4/js/dx.all.js"></script>
<script src="https://cdn3.devexpress.com/jslib/20.1.4/js/vectormap-data/world.js"></script>
<script src="https://cdn3.devexpress.com/jslib/20.1.4/js/vectormap-data/africa.js"></script>
<script src="https://cdn3.devexpress.com/jslib/20.1.4/js/vectormap-data/canada.js"></script>
<script src="https://cdn3.devexpress.com/jslib/20.1.4/js/vectormap-data/eurasia.js"></script>
<script src="https://cdn3.devexpress.com/jslib/20.1.4/js/vectormap-data/europe.js"></script>
<script src="https://cdn3.devexpress.com/jslib/20.1.4/js/vectormap-data/usa.js"></script>
<script src="data.js"></script>
<link rel="stylesheet" type="text/css" href="styles.css" />
<script src="index.js"></script>
</head>
<body class="dx-viewport">
<div class="demo-container" ng-app="DemoApp" ng-controller="DemoController">
<div id="vector-map" dx-vector-map="vectorMapOptions"></div>
<div class="options">
<div class="caption">Options</div>
<div class="option">
<span>Continent</span>
<div dx-select-box="chooseContinent"></div>
</div>
<div class="option">
<span>Zoom factor</span>
<div dx-text-box="zoomFactor"></div>
</div>
<div class="option">
<span>Center</span>
<div dx-text-box="center"></div>
</div>
</div>
</div>
</body>
</html>
#vector-map {
height: 420px;
}
.options {
padding: 20px;
background-color: rgba(191, 191, 191, 0.15);
margin-top: 20px;
}
.option {
margin-top: 10px;
}
.caption {
font-size: 18px;
font-weight: 500;
}
.option > span {
width: 140px;
display: inline-block;
}
.option > .dx-widget {
display: inline-block;
vertical-align: middle;
}
var viewportCoordinates = [{
"continent": "all",
"coordinates": "null"
}, {
"continent": "NorthAmerica",
"coordinates": [-180, 84.52, -22.11, -1.57]
}, {
"continent": "SouthAmerica",
"coordinates": [-112.47, 14.26, -27.52, -57.44]
}, {
"continent": "Africa",
"coordinates": [-29.34, 39.09, 55.60, -39.00]
}, {
"continent": "Europe",
"coordinates": [-2.35, 70.91, 61.35, 35.84]
}, {
"continent": "Asia",
"coordinates": [27.62, 83.11, 180, -19.36]
}, {
"continent": "Australia",
"coordinates": [104.87, -6.61, 149.98, -45.87]
}];