Neste post vamos aprender a como criar a sua primeira aplicação web utilizando um mapa 2D e permitindo trocar o mapa base (plano de fundo).
Meu conselho é que você guarde este código que vamos gerar, pois vamos utilizá-lo nos posts seguintes, os quais abordaremos os temas de como codificar a funcionalidade para buscar um endereço e apresentar no mapa e como codificar a funcionalidade para traçar direções de um ponto a outro.
Preparado para construir sua primeira aplicação web?
Vamos lá!
A primeira coisa que você precisará é ter um editor de texto e criar um arquivo com o nome MyAppArcGISforDevelopers.html. Esta será a sua página HTML. Ou se você preferir realizar de forma mais dinâmica, sugiro que você acesse o CodePen e crie um novo Pen para editar o HTML.
Depois que seu arquivo estiver criado ou um novo Pen foi aberto, você poderá adicionar o seguinte código:
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Dentro da tag <head>, você poderá adicionar as referências para o CSS e para a API Javascript do ArcGIS.
<link rel="stylesheet" href="https://js.arcgis.com/4.13/esri/themes/light/main.css"> <script type="litespeed/javascript" data-src="https://js.arcgis.com/4.13/"></script>
Ainda dentro da <head>, adicione a tag <script> e a expressão require para carregar os módulos de mapa (Map) e do visualizador de mapa (MapView).
Instancie um novo mapa (Map) e defina a propriedade de mapa base como topo-vector. Instancie um visualizador de mapa (MapView) e defina as propriedades container, mapa, centro e zoom, conforme o código abaixo:
<script type="litespeed/javascript">require(["esri/Map","esri/views/MapView"],function(Map,MapView){var map=new Map({basemap:"topo-vector"});var view=new MapView({container:"viewDiv",map:map,center:[-43.2105,-22.9519],zoom:14})})</script>
Você perceberá que a sua primeira aplicação web com mapa já está criada!
Parabéns!
Sua aplicação traz como centro do mapa o Cristo Redentor, no Corcovado, Rio de Janeiro.
Agora vamos dar a possibilidade de outros usuários alterarem o mapa base. A primeira coisa a fazer é adicionar no require o módulo BasemapGallery, que ficará da seguinte forma:
require([ "esri/Map", "esri/views/MapView", "esri/widgets/BasemapGallery" ], function(Map, MapView, BasemapGallery) {
No final da função principal, instancie o BasemapGallery e o configure para carregar os mapas base do ArcGIS Online. Veja o exemplo de código abaixo:
var basemapGallery = new BasemapGallery({ view: view, source: { portal: { url: "https://www.arcgis.com", useVectorBasemaps: true // Load vector tile basemaps } } });
Adicione o widget no topo direito da tela:
view.ui.add(basemapGallery, "bottom-left");
Good Job! Execute a sua primeira aplicação web de mapa.
Caso tenha alguma dúvida, confira o código na integra:
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Motivos que farão você migrar seu desenvolvimento para o ArcGIS for Developers
ArcGIS API for Python: os conceitos principais – parte 1
ArcGIS API for Python: os conceitos principais – parte 2
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