sn-map

A map for nebula.js.

Maps enable you to view your data geographically. Maps have many ways to present your data. You can add multiple layers to your map to display different types of information on the same map. You can set a custom scope for locations so that if two locations have the same name, you display the locations and their data correctly. You can add custom base maps to your map and use non-WGS-84 coordinates.

Layers

• Area layer: An area layer presents areas on a map, such as countries or states. With polygon geometry loaded into a field, it can present any custom area.
• Point layer: A point layer overlays individual locations on a map, representing them with shapes.
• Geodata layer: A geodata layer enables you to display a custom base map for your map visualization.

Requirements

Requires @nebula.js/stardust version 3.0.4 or later.

Installing

If you use npm: npm install @nebula.js/sn-map

Usage

import { embed } from '@nebula.js/stardust';
import map from '@nebula.js/sn-map';

// 'app' is an enigma app model
const nuked = embed(app, {
  types: [
    {
      // register the map
      name: 'map',
      load: () => Promise.resolve(map),
    },
  ],
});

// Rendering a map on the fly
nuked.render({
  type: 'map',
  element,
  options: {
    configuration: {
      serverUrl: ... ,
      serverKey: ... ,
    }
  },
  properties: {
    ...
  },
});

Options

These are optional settings to configure which map server you want to use. If not provided it will either try to use Qlik's cloud servers if connected to Sense (e.g. sn-map is used as an extension) or load a local script of Webmap5 to render layers.

• configuration
  • serverUrl - host url for map server.
  • serverKey - key for map server.

Area Layer

An area layer presents areas on your map, such as countries or states. With polygon geometry loaded into a field, it can present any custom area.

With an area layer, each dimension value corresponds to a presented area.

Examples

nuked.render({
  type: 'map',
  element,
  properties: {
    gaLayers: [
      {
        type: 'AreaLayer',
        qHyperCubeDef: {
          qDimensions: [
            {
              qDef: {
                qFieldDefs: ['Countries'],
              },
              qAttributeExpressions: [
                {
                  qExpression: 'Polygons',
                  id: 'locationOrLatitude',
                },
              ],
            },
          ],
          qMeasures: [],
          qInitialDataFetch: [
            {
              qLeft: 0,
              qTop: 0,
              qWidth: 1,
              qHeight: 1000,
            },
          ],
        },
        color: {
          mode: 'primary',
          paletteColor: {
            color: '#f8981d',
          },
        },
        id: 'tWTdanX',
      },
    ],
    mapSettings: {
      showScaleBar: true,
    },
  },
});

Point Layer

A point layer overlays individual locations on a map, representing them with shapes.

Point layers use circular bubbles. The size of the points are fixed and can be colored with a single color.

Example

nuked.render({
  type: 'map',
  element,
  options: {
    configuration: {
      serverUrl: 'https://maps.qlikcloud.com',
      serverKey: ... ,
    },
  },
  properties: {
    gaLayers: [
      {
        type: 'PointLayer',
        qHyperCubeDef: {
          qDimensions: [
            {
              qDef: {
                qFieldDefs: [
                  'id'
                ],
              },
              qAttributeExpressions: [
                {
                  qExpression: 'latitude',
                  id: 'locationOrLatitude'
                },
                {
                  qExpression: 'longitude',
                  id: 'longitude'
                }
              ],
            }
          ],
          qMeasures: [],
          qInitialDataFetch: [
            {
              qLeft: 0,
              qTop: 0,
              qWidth: 1,
              qHeight: 10000
            }
          ],
        },
        size: {
          value: 10,
        },
        color: {
          mode: 'primary',
          paletteColor: {
            color: '#f8981d'
          },
        },
        isLatLong: true,
        id: 'tWTdanX'
      }
    ],
    mapSettings: {
      showScaleBar: true,
    },
  },
});

Geodata Layer

Geodata layers enable you to display a custom base map for your map visualization.

A geodata layer could, for example, be a map of an airport that then has a point layer with WIFI hotspot locations overlaid on it. If the custom base map format supports transparency, you can overlay it on top of another map. Sn-map supports the following custom maps formats as geodata layers:

• Tile map services (TMS)
• Web Map Service (WMS)
• Image URL (Image)

Example

nuked.render({
  type: 'map',
  element,
  properties: {
    gaLayers: [
      {
        type: 'GeodataLayer',
        dataType: 'wms',
        wms: {
          url: 'https://nowcoast.noaa.gov/arcgis/services/nowcoast/analysis_meteohydro_sfc_qpe_time/MapServer/WmsServer',
          hasWmsLoaded: true,
          selectedFormat: 'PNG',
          capabilities: {
            layers: [
              {
                name: '1',
                selected: true,
              },
              {
                name: '2',
                selected: true,
              },
              {
                name: '3',
                selected: true,
              },
            ],
            transparent: true,
          },
        },
        id: 'bKgjAA',
      },
    ],
    mapSettings: {
      showScaleBar: true,
      projection: 'default',
    },
  },
});