Shape & Symbol

Draw different shapes and symbol to the map.

Demo

Plain HTML

You can find the live Demo on CodeSandbox here.

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<!DOCTYPE html>
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<html lang="en">
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  <head>
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    <meta name="viewport" content="initial-scale=1.0" />
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    <meta charset="UTF-8" />
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    <title>Basic Map</title>
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    <link
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      href="https://maps-gl.nextbillion.io/maps/v2/api/css"
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      rel="stylesheet"
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    />
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    <style>
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      * {
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        margin: 0;
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        padding: 0;
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      }
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      #map {
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        width: 100vw;
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        height: 100vh;
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      }
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    </style>
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  </head>
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  <body>
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    <div id="map"></div>
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    <script src="https://maps-gl.nextbillion.io/maps/v2/api/js"></script>
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    <script>
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      (function () {
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        // draw a polyline
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        function drawPolyline(nbmap) {
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          nbmap.map.addSource("polyline-source", {
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            type: "geojson",
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            data: {
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              type: "FeatureCollection",
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              features: [
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                {
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                  type: "Feature",
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                  properties: {
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                    color: "#e74747" // red clolor
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                  },
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                  geometry: {
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                    type: "LineString",
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                    coordinates: [
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                      [-118.24648, 34.05815],
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                      [-118.24556, 34.05739],
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                      [-118.2445, 34.0565],
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                      [-118.24397, 34.05605],
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                      [-118.24359, 34.05573],
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                      [-118.24372, 34.05559],
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                      [-118.24385, 34.05544],
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                      [-118.24427, 34.05501],
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                      [-118.24509, 34.05412],
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                      [-118.24555, 34.05361]
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                    ]
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                  }
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                },
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                {
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                  type: "Feature",
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                  properties: {
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                    color: "#93a1ff" // blue clolor
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                  },
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                  geometry: {
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                    type: "LineString",
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                    coordinates: [
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                      [-118.24648, 34.05815],
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                      [-118.24748, 34.05725],
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                      [-118.24763, 34.05712],
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                      [-118.24797, 34.05678],
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                      [-118.24823, 34.05641],
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                      [-118.24836, 34.05623],
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                      [-118.24874572, 34.05567155],
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                      [-118.24637, 34.05417],
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                      [-118.24571, 34.05376],
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                      [-118.24553, 34.05363],
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                      [-118.24555, 34.05361]
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                    ]
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                  }
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                }
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              ]
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            }
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          });
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          // you can get more information about setting the style of lines here. https://maplibre.org/maplibre-gl-js-docs/style-spec/layers/#line
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          nbmap.map.addLayer({
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            id: "polyline-layer",
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            type: "line",
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            source: "polyline-source",
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            paint: {
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              "line-width": 3,
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              // get color from the source
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              "line-color": ["get", "color"]
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            }
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          });
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        }
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        // draw a polygon
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        function drawPolygon(nbmap) {
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          nbmap.map.addSource("polygon-source", {
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            type: "geojson",
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            data: {
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              type: "FeatureCollection",
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              features: [
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                {
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                  type: "Feature",
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                  geometry: {
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                    type: "Polygon",
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                    coordinates: [
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                      [
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                        [-118.24455192, 34.05649731],
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                        [-118.24646327, 34.05811205],
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                        [-118.24751855, 34.05716641],
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                        [-118.2479062, 34.05678279],
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                        [-118.24834231, 34.05621183],
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                        [-118.24870843, 34.05567655],
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                        [-118.24661649, 34.05436717],
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                        [-118.24455192, 34.05649731]
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                      ]
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                    ]
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                  }
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                }
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              ]
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            }
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          });
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          // you can get more information about setting the style of layers here. https://maplibre.org/maplibre-gl-js-docs/style-spec/layers/
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          nbmap.map.addLayer({
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            id: "polygon-layer",
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            type: "fill",
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            source: "polygon-source",
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            paint: {
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              // fill with green color and a opacity of 0.6
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              "fill-color": "#469300",
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              "fill-opacity": 0.6
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            }
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          });
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        }
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        // draw a circle
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        function drawCircle(nbmap) {
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          nbmap.map.addSource("circle-source", {
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            type: "geojson",
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            data: {
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              type: "FeatureCollection",
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              features: [
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                {
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                  type: "Feature",
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                  geometry: {
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                    type: "Point",
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                    coordinates: [-118.24501946, 34.05507342]
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                  }
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                }
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              ]
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            }
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          });
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          // you can get more information about setting the style of layers here. https://maplibre.org/maplibre-gl-js-docs/style-spec/layers/#circle
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          nbmap.map.addLayer({
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            id: "circle-layer",
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            type: "circle",
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            source: "circle-source",
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            paint: {
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              "circle-color": "#8d5a9e",
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              "circle-radius": 40
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            }
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          });
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        }
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        // draw symbol
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        function drawSymbol(nbmap) {
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          nbmap.map.addSource("symbol-source", {
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            type: "geojson",
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            data: {
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              type: "FeatureCollection",
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              features: [
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                {
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                  type: "Feature",
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                  geometry: {
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                    type: "Point",
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                    coordinates: [-118.24501946, 34.05507342]
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                  }
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                }
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              ]
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            }
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          });
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          // you can get more information about setting the style of layers here. https://maplibre.org/maplibre-gl-js-docs/style-spec/layers/#symbol
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          nbmap.map.addLayer({
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            id: "symbol-layer",
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            type: "symbol",
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            source: "symbol-source",
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            layout: {
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              "symbol-placement": "point",
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              visibility: "visible",
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              "symbol-spacing": 1,
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              "icon-allow-overlap": true,
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              "icon-image": "nb-logo",
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              "icon-size": 0.16
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            }
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          });
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        }
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        // You need to replace the apiKey with yours
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        nextbillion.setApiKey("your-api-key");
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        var nbmap = new nextbillion.maps.Map({
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          container: document.getElementById("map"),
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          style: "https://api.nextbillion.io/maps/streets/style.json",
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          zoom: 15,
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          center: { lat: 34.05649731, lng: -118.24455192 }
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        });
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        nbmap.on("load", () => {
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          drawPolyline(nbmap);
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          drawPolygon(nbmap);
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          drawCircle(nbmap);
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          // load image so we can use it in the symbol layer
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          nbmap.map.loadImage(
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            "https://static.nextbillion.io/docs-next/nbai-logo-white.png",
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            (err, image) => {
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              if (err) {
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                console.error("err image", err);
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                return;
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              }
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              nbmap.map.addImage("nb-logo", image);
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              drawSymbol(nbmap);
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            }
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          );
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        });
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      })();
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    </script>
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  </body>
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</html>

React

You can find the live Demo on CodeSandbox here.

1
import React, { useEffect } from 'react'
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import '@nbai/nbmap-gl/dist/nextbillion.css'
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import nextbillion, { NBMap } from '@nbai/nbmap-gl'
4


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// draw a polyline
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function drawPolyline(nbmap) {
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  nbmap.map.addSource('polyline-source', {
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    type: 'geojson',
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    data: {
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      type: 'FeatureCollection',
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      features: [
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        {
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          type: 'Feature',
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          properties: {
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            color: '#e74747' // red clolor
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          },
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          geometry: {
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            type: 'LineString',
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            coordinates: [
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              [-118.24648, 34.05815],
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              [-118.24556, 34.05739],
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              [-118.2445, 34.0565],
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              [-118.24397, 34.05605],
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              [-118.24359, 34.05573],
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              [-118.24372, 34.05559],
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              [-118.24385, 34.05544],
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              [-118.24427, 34.05501],
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              [-118.24509, 34.05412],
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              [-118.24555, 34.05361]
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            ]
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          }
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        },
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        {
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          type: 'Feature',
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          properties: {
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            color: '#93a1ff' // blue clolor
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          },
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          geometry: {
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            type: 'LineString',
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            coordinates: [
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              [-118.24648, 34.05815],
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              [-118.24748, 34.05725],
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              [-118.24763, 34.05712],
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              [-118.24797, 34.05678],
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              [-118.24823, 34.05641],
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              [-118.24836, 34.05623],
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              [-118.24874572, 34.05567155],
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              [-118.24637, 34.05417],
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              [-118.24571, 34.05376],
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              [-118.24553, 34.05363],
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              [-118.24555, 34.05361]
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            ]
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          }
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        }
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      ]
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    }
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  })
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  // you can get more information about setting the style of lines here. https://maplibre.org/maplibre-gl-js-docs/style-spec/layers/#line
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  nbmap.map.addLayer({
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    id: 'polyline-layer',
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    type: 'line',
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    source: 'polyline-source',
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    paint: {
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      'line-width': 3,
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      // get color from the source
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      'line-color': ['get', 'color']
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    }
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  })
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}
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// draw a polygon
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function drawPolygon(nbmap) {
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  nbmap.map.addSource('polygon-source', {
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    type: 'geojson',
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    data: {
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      type: 'FeatureCollection',
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      features: [
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        {
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          type: 'Feature',
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          geometry: {
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            type: 'Polygon',
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            coordinates: [
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              [
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                [-118.24455192, 34.05649731],
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                [-118.24646327, 34.05811205],
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                [-118.24751855, 34.05716641],
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                [-118.2479062, 34.05678279],
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                [-118.24834231, 34.05621183],
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                [-118.24870843, 34.05567655],
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                [-118.24661649, 34.05436717],
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                [-118.24455192, 34.05649731]
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              ]
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            ]
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          }
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        }
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      ]
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    }
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  })
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  // you can get more information about setting the style of layers here. https://maplibre.org/maplibre-gl-js-docs/style-spec/layers/
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  nbmap.map.addLayer({
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    id: 'polygon-layer',
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    type: 'fill',
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    source: 'polygon-source',
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    paint: {
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      // fill with green color and a opacity of 0.6
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      'fill-color': '#469300',
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      'fill-opacity': 0.6
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    }
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  })
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}
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// draw a circle
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function drawCircle(nbmap) {
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  nbmap.map.addSource('circle-source', {
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    type: 'geojson',
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    data: {
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      type: 'FeatureCollection',
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      features: [
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        {
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          type: 'Feature',
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          geometry: {
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            type: 'Point',
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            coordinates: [-118.24501946, 34.05507342]
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          }
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        }
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      ]
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    }
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  })
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  // you can get more information about setting the style of layers here. https://maplibre.org/maplibre-gl-js-docs/style-spec/layers/#circle
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  nbmap.map.addLayer({
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    id: 'circle-layer',
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    type: 'circle',
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    source: 'circle-source',
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    paint: {
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      'circle-color': '#8d5a9e',
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      'circle-radius': 40
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    }
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  })
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}
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// draw symbol
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function drawSymbol(nbmap) {
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  nbmap.map.addSource('symbol-source', {
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    type: 'geojson',
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    data: {
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      type: 'FeatureCollection',
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      features: [
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        {
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          type: 'Feature',
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          geometry: {
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            type: 'Point',
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            coordinates: [-118.24501946, 34.05507342]
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          }
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        }
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      ]
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    }
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  })
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  // you can get more information about setting the style of layers here. https://maplibre.org/maplibre-gl-js-docs/style-spec/layers/#symbol
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  nbmap.map.addLayer({
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    id: 'symbol-layer',
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    type: 'symbol',
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    source: 'symbol-source',
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    layout: {
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      'symbol-placement': 'point',
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      visibility: 'visible',
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      'symbol-spacing': 1,
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      'icon-allow-overlap': true,
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      'icon-image': 'nb-logo',
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      'icon-size': 0.16
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    }
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  })
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}
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const DrawDemo = () => {
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  useEffect(() => {
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    nextbillion.setApiKey('your-api-key')
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    const nbmap = new NBMap({
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      container: 'map',
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      style: 'https://api.nextbillion.io/maps/streets/style.json',
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      zoom: 15,
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      center: { lat: 34.05649731, lng: -118.24455192 }
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    })
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    nbmap.on('load', () => {
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      drawPolyline(nbmap)
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      drawPolygon(nbmap)
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      drawCircle(nbmap)
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      // load image so we can use it in the symbol layer
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      nbmap.map.loadImage(
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        'https://static.nextbillion.io/docs-next/nbai-logo-white.png',
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        (err, image) => {
194
          if (err) {
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            console.error('err image', err)
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            return
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          }
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          nbmap.map.addImage('nb-logo', image)
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          drawSymbol(nbmap)
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        }
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      )
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    })
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  }, [])
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  return (
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    <div className="app">
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      <div
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        style={{
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          width: '100%',
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          height: '100%',
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          position: 'fixed',
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          top: '0',
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          left: '0'
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        }}
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        id="map"></div>
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    </div>
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  )
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}
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export default DrawDemo

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