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Color Mapping in JavaScript TreeMap control

26 Nov 2021 / 5 minutes to read

Color mapping is used to customize the color for each group or item based on the specified types. The following options are available to customize the group and leaf items in the TreeMap.

Range color mapping

Range color mapping is used to apply color to the items by giving specific ranges in the DataSource, and it should be specifying the data source properties to the rangeColorValuePath. The color mapping ranges to be specified in the from and to properties of the colorMapping.

Source
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index.ts
index.html
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let fruits:Object[] = [{ fruit:'Apple', count:5000 },
                       { fruit:'Mango', count:3000 },
                       { fruit:'Orange', count:2300 },
                       { fruit:'Banana', count:500 },
                       { fruit:'Grape', count:4300 },
                       { fruit:'Papaya', count:1200 },
                       { fruit:'Melon', count:4500 }
                     ];

import { TreeMap } from '@syncfusion/ej2-treemap';
let treemap: TreeMap = new TreeMap({
    dataSource: fruits ,
    weightValuePath: 'count',
    rangeColorValuePath:'count',
    leafItemSettings: {
        labelPath: 'fruit',
        colorMapping:[
            {
               from:500,
               to:3000,
               color:'orange'
           },
           {
               from:3000,
               to:5000,
               color:'green'
           }
        ]
     },
}, '#container');
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<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 for Treemap </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for treemap UI Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
    </div>
</body>

</html>

Equal color mapping

Equal color mapping is used to fill colors to each item by specifying equal value present in the data source, that can be specified in the equalColorValuePath property.

Source
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index.ts
index.html
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let CarDetails:Object[] = [{ Car:'Mustang', Brand:'Ford', count:232 },
                       { Car:'EcoSport', Brand:'Ford', count:121 },
                       { Car:'Swift', Brand:'Maruti', count:143 },
                       { Car:'Baleno', Brand:'Maruti', count:454 },
                       { Car:'Vitara Brezza', Brand:'Maruti', count:545 },
                       { Car:'A3 Cabriolet', Brand:'Audi',count:123 },
                       { car:'RS7 Sportback', Brand:'Audi', count:523 }
                     ];

import { TreeMap } from '@syncfusion/ej2-treemap';
let treemap: TreeMap = new TreeMap({
    dataSource: CarDetails ,
    weightValuePath: 'count',
    equalColorValuePath:'Brand',
    leafItemSettings: {
        labelPath: 'Car',
        colorMapping:[
            {
               value:'Ford',
               color:'green'
           },
           {
               value:'Audi',
               color:'red'
           },
           {
               value:'Maruti',
               color:'orange'
           }
        ]
     },
}, '#container');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 for Treemap </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for treemap UI Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
    </div>
</body>

</html>

Desaturation color mapping

Desaturation color mapping is used to apply colors to the items based on the minOpacity and maxOpacity properties in the colorMapping.

Source
Preview
index.ts
index.html
Copied to clipboard
let fruits:Object[] = [{ fruit:'Apple', count:5000 },
                       { fruit:'Mango', count:3000 },
                       { fruit:'Orange', count:2300 },
                       { fruit:'Banana', count:500 },
                       { fruit:'Grape', count:4300 },
                       { fruit:'Papaya', count:1200 },
                       { fruit:'Melon', count:4500 }
                     ];

import { TreeMap } from '@syncfusion/ej2-treemap';
let treemap: TreeMap = new TreeMap({
    dataSource: fruits ,
    weightValuePath: 'count',
    rangeColorValuePath:'count',
    leafItemSettings: {
        labelPath: 'fruit',
        colorMapping:[
            {
               from:500,
               to:3000,
               minOpacity:0.2,
               maxOpacity:0.5,
               color:'orange'
           },
           {
               from:3000,
               to:5000,
               minOpacity:0.5,
               maxOpacity:0.8,
               color:'green'
           }
        ]
     }
}, '#container');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 for Treemap </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for treemap UI Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
    </div>
</body>

</html>

Palette color mapping

The palette color mapping is used to fill the color to each group or leaf item by given colors in the palette property.

Source
Preview
index.ts
index.html
Copied to clipboard
let CarDetails:Object[] = [{ Car:'Mustang', Brand:'Ford', count:232 },
                       { Car:'EcoSport', Brand:'Ford', count:121 },
                       { Car:'Swift', Brand:'Maruti', count:143 },
                       { Car:'Baleno', Brand:'Maruti', count:454 },
                       { Car:'Vitara Brezza', Brand:'Maruti', count:545 },
                       { Car:'A3 Cabriolet', Brand:'Audi',count:123 },
                       { car:'RS7 Sportback', Brand:'Audi', count:523 }
                     ];

import { TreeMap } from '@syncfusion/ej2-treemap';
let treemap: TreeMap = new TreeMap({
    dataSource: CarDetails ,
    palette:['red','green'],
    weightValuePath: 'count',
    leafItemSettings: {
        labelPath: 'Car'
     }
}, '#container');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 for Treemap </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for treemap UI Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
    </div>
</body>

</html>

Desaturation with multiple colors

Multiple colors are used as gradient effect to specific shapes based on the ranges in datasource. By using color property, you can set n number of colors.

Source
Preview
index.ts
index.html
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let fruits:Object[] = [{ fruit:'Apple', count:5000 },
                       { fruit:'Mango', count:3000 },
                       { fruit:'Orange', count:2300 },
                       { fruit:'Banana', count:500 },
                       { fruit:'Grape', count:4300 },
                       { fruit:'Papaya', count:1200 },
                       { fruit:'Melon', count:4500 }
                     ];

import { TreeMap } from '@syncfusion/ej2-treemap';
let treemap: TreeMap = new TreeMap({
    dataSource: fruits ,
    weightValuePath: 'count',
    rangeColorValuePath:'count',
    legendSettings:{
        visible:true
    },
    leafItemSettings: {
        labelPath: 'fruit',
        colorMapping:[
            {
               from:500,
               to:2500,
               color:['orange','pink']
           },
           {
               from:3000,
               to:5000,
               color:['green','red','blue']
           }
        ]
     }
}, '#container');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 for Treemap </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for treemap UI Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
    </div>
</body>

</html>

Color for items excluded from color mapping

Get the excluded ranges from data source using the color mapping and apply the specific color to those items, without specifying the from and to properties.

Source
Preview
index.ts
index.html
Copied to clipboard
let fruits:Object[] = [{ fruit:'Apple', count:5000 },
                       { fruit:'Mango', count:3000 },
                       { fruit:'Orange', count:2300 },
                       { fruit:'Banana', count:500 },
                       { fruit:'Grape', count:4300 },
                       { fruit:'Papaya', count:1200 },
                       { fruit:'Melon', count:4500 }
                     ];

import { TreeMap } from '@syncfusion/ej2-treemap';
let treemap: TreeMap = new TreeMap({
    dataSource: fruits ,
    weightValuePath: 'count',
    rangeColorValuePath:'count',
    legendSettings:{
        visible: true
    },
    leafItemSettings: {
        labelPath: 'fruit',
        colorMapping:[
            {
               from:500,
               to:2500,
               color:'orange'
           },
           {
               from:3000,
               to:4000,
               color:'green'
           },
           {
               color:'red'
           }
        ]
     }
}, '#container');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 for Treemap </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for treemap UI Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
    </div>
</body>

</html>

Bind the colors to the items from data source

To set the color for each item from the data source, bind the data source property to the colorValuePath.

Source
Preview
index.ts
index.html
Copied to clipboard
let fruits:Object[] = [{ fruit:'Apple', count:5000, color: 'red'},
                       { fruit:'Mango', count:3000, color:'blue'},
                       { fruit:'Orange', count:2300, color:'green' },
                       { fruit:'Banana', count:500, color:'yellow' },
                       { fruit:'Grape', count:4300, color:'orange' },
                       { fruit:'Papaya', count:1200, color:'pink' },
                       { fruit:'Melon', count:4500, color:'violet' }
                     ];

import { TreeMap } from '@syncfusion/ej2-treemap';
let treemap: TreeMap = new TreeMap({
    dataSource: fruits ,
    weightValuePath: 'count',
    colorValuePath:'color',
    leafItemSettings: {
        labelPath: 'fruit',
     }
}, '#container');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 for Treemap </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for treemap UI Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
    </div>
</body>

</html>