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Color Mapping in Vue Maps component

14 Oct 2021 / 8 minutes to read

Color mapping is used to customize the shape colors based on the given values. It has three types.

  1. Range color mapping
  2. Equal color mapping
  3. Desaturation color mapping.

To add color mapping to the shapes of the Maps, bind the data source to the dataSource property of layerSettings and set the field name which contains the color value in the data source to the colorValuePath property.

Types of color mapping

Range color mapping

Range color mapping applies the color to the shapes of the Maps which matches the numeric values in the data source within the given color mapping ranges. The from and to properties in the colorMapping are used to specify the color mapping ranges in the Maps.

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export let population_density = [
...
{
    'code': 'AE',
    'value': 90,
    'name': 'United Arab Emirates',
    'population': 8264070,
    'density': 99
},
{
    'code': 'GB',
    'value': 257,
    'name': 'United Kingdom',
    'population': 62041708,
    'density': 255
},
{
    'code': 'US',
    'value': 34,
    'name': 'United States',
    'population': 325020000,
    'density': 33
}
...
];

Bind the population_density data to the dataSource property of layerSettings and set the colorValuePath property of shapeSettings as density. The range values can be set using the from and to properties of colorMapping.

Source
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app.vue
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<template>
<div id="app">
      <div class='wrapper'>
        <ejs-maps >
            <e-layers>
                <e-layer :shapeData='shapeData' :shapePropertyPath='shapePropertyPath' :shapeDataPath='shapeDataPath' :dataSource='dataSource' :shapeSettings='shapeSettings' ></e-layer>
            </e-layers>
        </ejs-maps>
    </div>
</div>
</template>

<script>
import Vue from 'vue';
import { MapsPlugin } from '@syncfusion/ej2-vue-maps';
import { world_map } from './world-map.js';
import { population_density } from './population-density.js';
Vue.use(MapsPlugin);
export default {
data () {
return{
    shapeData: world_map,
    shapeDataPath: 'name',
    shapePropertyPath: 'name',
    dataSource: population_density,
    shapeSettings: {
        colorValuePath: 'density',
        fill: '#E5E5E5',
        colorMapping: [
            {
                from: 0.00001, to: 100, color: 'rgb(153,174,214)'
            },
            {
                from: 100, to: 200, color: 'rgb(115,143,199)'
            },
            {
                from: 200, to: 300, color: 'rgb(77,112,184)'
            },
            {
                from: 300, to: 500, color: 'rgb(38,82,168)'
            },
            {
                from: 500, to: 19000, color: 'rgb(0,51,153)'
            }
        ]
    }
}
},
}
</script>
<style>
  .wrapper {
max-width: 400px;
margin: 0 auto;
  }
</style>

Equal color mapping

Equal color mapping applies the color to the shapes of the Maps when the value property of colorMapping matches with the values provided in the data source. The following example shows how to apply equal color mapping to the shapes with the data source unCountries which illustrates the permanent and non-permanent countries in the UN security council.

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export let unCountries: object[] = [
{ Country: 'China', Membership: 'Permanent' },
{ Country: 'France', Membership: 'Permanent' },
{ Country: 'Russia', Membership: 'Permanent' },
{ Country: 'United Kingdom', Membership: 'Permanent' },
{ Country: 'United States', Membership: 'Permanent' },
{ Country: 'Bolivia', Membership: 'Non-Permanent' },
{ Country: 'Eq. Guinea', Membership: 'Non-Permanent' },
{ Country: 'Ethiopia', Membership: 'Non-Permanent' },
{ Country: "Côte d'Ivoire", Membership: 'Permanent' },
{ Country: 'Kazakhstan', Membership: 'Non-Permanent' },
{ Country: 'Kuwait', Membership: 'Non-Permanent' },
{ Country: 'Netherlands', Membership: 'Non-Permanent' },
{ Country: 'Peru', Membership: 'Non-Permanent' },
{ Country: 'Poland', Membership: 'Non-Permanent' },
{ Country: 'Sweden', Membership: 'Non-Permanent' },
];

Bind the unCountries data to the dataSource property of layerSettings and set the colorValuePath property of shapeSettings as Membership. Set the value property in the colorMapping to Permanent and Non-Permanent in the different set of color mapping properties. If the corresponding value of the colorValuePath property matches with the corresponding field name in the data source, then the given color will be applied.

Source
Preview
app.vue
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<template>
<div id="app">
      <div class='wrapper'>
        <ejs-maps >
            <e-layers>
                <e-layer :shapeData='shapeData' :shapePropertyPath='shapePropertyPath' :shapeDataPath='shapeDataPath' :dataSource='dataSource' :shapeSettings='shapeSettings' ></e-layer>
            </e-layers>
        </ejs-maps>
    </div>
</div>
</template>

<script>
import Vue from 'vue';
import { MapsPlugin } from '@syncfusion/ej2-vue-maps';
import { world_map } from './world-map.js';
import { uncountries } from './countries.js';
Vue.use(MapsPlugin);
export default {
data () {
return{
    shapeData: world_map,
    shapeDataPath: 'Country',
    shapePropertyPath: 'name',
    dataSource : uncountries,
    shapeSettings: {
        fill: '#E5E5E5',
        colorMapping: [
            {
                value: 'Permanent',
                color: '#EDB46F'
            },
            {
                color: '#F1931B',
                value: 'Non-Permanent'
            }
        ],
        colorValuePath: 'Membership'
    }
}
},
}
</script>
<style>
  .wrapper {
max-width: 400px;
margin: 0 auto;
  }
</style>

Desaturation color mapping

Desaturation color mapping applies the color to the shapes of the Maps, similar to the range color mapping. The opacity will be applied in this color mapping based on the minOpacity and maxOpacity properties in the colorMapping.

The following example shows how to apply desaturation color mapping to the shapes with the data source population_density that is available in the Range color mapping section.

Bind the population_density data to the dataSource property of layerSettings and set the colorValuePath property of shapeSettings as density. The range values can be set using the from and to properties of colorMapping.

Source
Preview
app.vue
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<template>
<div id="app">
      <div class='wrapper'>
        <ejs-maps >
            <e-layers>
                <e-layer :shapeData='shapeData' :shapePropertyPath='shapePropertyPath' :shapeDataPath='shapeDataPath' :dataSource='dataSource' :shapeSettings='shapeSettings' ></e-layer>
            </e-layers>
        </ejs-maps>
    </div>
</div>
</template>

<script>
import Vue from 'vue';
import { MapsPlugin } from '@syncfusion/ej2-vue-maps';
import { world_map } from './world-map.js';
import { population_density } from './population-density.js';
Vue.use(MapsPlugin);
export default {
data () {
return{
    shapeData: world_map,
    shapeDataPath: 'name',
    shapePropertyPath: 'name',
    dataSource: population_density,
    shapeSettings: {
        colorValuePath: 'density',
        fill: '#E5E5E5',
        colorMapping: [
            {
                from: 0, to: 100, color: 'red', minOpacity:0.2, maxOpacity:1
            },
            {
                from: 101, to: 200, color: 'blue', minOpacity:0.3, maxOpacity:1
            }
        ]
    }
}
},
}
</script>
<style>
  .wrapper {
max-width: 400px;
margin: 0 auto;
  }
</style>

Multiple colors for a single shape

Multiple colors can be added to the color mapping which can be used as gradient effect to a specific shape based on the ranges in the data source. By using the color property of colorMapping, any number of colors can be set to the shapes as a gradient.

The following example demonstrates how to use multiple colors in color mapping with the data source population_density that is available in the Range color mapping section.

Bind the population_density data to the dataSource property of layerSettings and set the colorValuePath property of shapeSettings as density. The range values can be set using the from and to properties of colorMapping.

Source
Preview
app.vue
Copied to clipboard
<template>
<div id="app">
      <div class='wrapper'>
        <ejs-maps >
            <e-layers>
                <e-layer :shapeData='shapeData' :shapePropertyPath='shapePropertyPath' :shapeDataPath='shapeDataPath' :dataSource='dataSource' :shapeSettings='shapeSettings' ></e-layer>
            </e-layers>
        </ejs-maps>
    </div>
</div>
</template>

<script>
import Vue from 'vue';
import { MapsPlugin } from '@syncfusion/ej2-vue-maps';
import { world_map } from './world-map.js';
import { population_density } from './population-density.js';
Vue.use(MapsPlugin);
export default {
data () {
return{
    shapeData: world_map,
    shapeDataPath: 'name',
    shapePropertyPath: 'name',
    dataSource: population_density,
    shapeSettings: {
        colorValuePath: 'density',
        fill: '#E5E5E5',
        colorMapping: [
            {
                from: 0, to: 100, color: ['red','blue']
            },
            {
                from: 101, to: 200, color: ['green','yellow']
            }
        ]
    }
}
},
}
</script>
<style>
  .wrapper {
max-width: 400px;
margin: 0 auto;
  }
</style>

Color for items excluded from color mapping

Color mapping can be applied to the shapes in the Maps which does not match color mapping criteria such as range or equal values using the color property of colorMapping.

The following example shows how to set the color for items excluded from the color mapping with the data source population_density that is available in the Range color mapping section.

In the following example, color mapping is added for the ranges from 0 to 200. If there are any records in the data source that are outside of this range, the color mapping will not be applied. To apply the color for these excluded items, set the color property alone in the colorMapping.

Source
Preview
app.vue
Copied to clipboard
<template>
<div id="app">
      <div class='wrapper'>
        <ejs-maps >
            <e-layers>
                <e-layer :shapeData='shapeData' :shapePropertyPath='shapePropertyPath' :shapeDataPath='shapeDataPath' :dataSource='dataSource' :shapeSettings='shapeSettings' ></e-layer>
            </e-layers>
        </ejs-maps>
    </div>
</div>
</template>

<script>
import Vue from 'vue';
import { MapsPlugin } from '@syncfusion/ej2-vue-maps';
import { world_map } from './world-map.js';
import { population_density } from './population-density.js';
Vue.use(MapsPlugin);
export default {
data () {
return{
    shapeData: world_map,
    shapeDataPath: 'name',
    shapePropertyPath: 'name',
    dataSource: population_density,
    shapeSettings: {
        colorValuePath: 'density',
        fill: '#E5E5E5',
        colorMapping: [
            {
                from: 0, to: 100, color: ['red','blue']
            },
            {
                from: 101, to: 200, color: ['green','yellow']
            },
            {
                color: 'green'
            }
        ]
    }
}
},
}
</script>
<style>
  .wrapper {
max-width: 400px;
margin: 0 auto;
  }
</style>

Color mapping for bubbles

The color mapping types such as range color mapping, equal color mapping and desaturation color mapping are applicable for bubbles in the Maps. To add color mapping for bubbles of the Maps, bind the data source to the dataSource property of bubbleSettings and set the field name which contains the color value in the data source to the colorValuePath property. Multiple colors for a single set of bubbles and color for excluded items from colorMapping are also applicable for bubbles.

Source
Preview
app.vue
Copied to clipboard
<template>
<div id="app">
      <div class='wrapper'>
        <ejs-maps >
            <e-layers>
                <e-layer :shapeData='shapeData' :shapePropertyPath='shapePropertyPath' :shapeDataPath='shapeDataPath' :bubbleSettings='bubbleSettings' ></e-layer>
            </e-layers>
        </ejs-maps>
    </div>
</div>
</template>

<script>
import Vue from 'vue';
import { MapsPlugin, Bubble } from '@syncfusion/ej2-vue-maps';
import { world_map } from './world-map.js';
Vue.use(MapsPlugin);
export default {
data () {
return{
    shapeData: world_map,
    shapeDataPath: 'name',
    shapePropertyPath: 'name',
    bubbleSettings: [{
        visible: true,
        minRadius: 5,
        dataSource: [
            { name: 'India', population: '38332521' },
            { name: 'New Zealand', population: '19651127' },
            { name: 'Pakistan', population: '3090416' }
        ],
        valuePath: 'population',
        colorValuePath: 'population',
        colorMapping: [{
             value: '38332521',
             color: '#C3E6ED'
        },
        {
            value: '19651127',
            color: '#F1931B'
        },
        {
            value: '3090416',
            color: 'blue'
        }]
    }]
}
},
provide: {
maps: [Bubble]
}
}
</script>
<style>
  .wrapper {
max-width: 400px;
margin: 0 auto;
  }
</style>