Installation

• tns plugin add @nativescript-community/ui-chart

Migration to 2.x

In 2.x most methods like setColor/getColor have been changed to properties like color You can either to it manually and update them all (you should get tsc errors for removed or renamed methods), or you can use a regexp like /set([A-Z])(\w*?)\(/ to search and replace (first group should be lowercase in the replace) with something like \L$1$2=( Then use typings to fix potential name change

Usage

For gestures to work, make sure to add the following code block inside main application file (e.g. app.ts):

import { install } from '@nativescript-community/ui-chart';
install();

You can also check Wiki for any useful material.

Plain NativeScript

IMPORTANT: Make sure you include xmlns:ch="@nativescript-community/ui-chart" on the Page element.

XML

<Page xmlns="http://schemas.nativescript.org/tns.xsd" xmlns:ch="@nativescript-community/ui-chart">
    <ScrollView>
        <StackLayout>
            <Label text="Line Chart" fontSize="20"/>
            <ch:LineChart id="line-chart" backgroundColor="lightgray" width="300" height="350" loaded="onLineChartLoaded"/>
        </StackLayout>
    </ScrollView>
</Page>

TypeScript

import { LineChart } from '@nativescript-community/ui-chart/charts/LineChart';
import { LineDataSet } from '@nativescript-community/ui-chart/data/LineDataSet';
import { LineData } from '@nativescript-community/ui-chart/data/LineData';

export function onLineChartLoaded(args) {
    const chart = args.object as LineChart;

    chart.dragEnabled = true;
    chart.scaleEnabled = true;

    const data = new Array(500).fill(0).map((v, i) => ({
        index: i,
        value: Math.random() * 1,
    }));

    const sets = [];
    const set = new LineDataSet(data, 'Legend Label', 'index', 'value');
    set.color = 'blue';
    sets.push(set);

    // Create a data object with the data sets
    const ld = new LineData(sets);

    // Set data
    chart.data = ld;
}

NativeScript + Vue

Vue.registerElement('LineChart', () => require('@nativescript-community/ui-chart').LineChart);

<LineChart ref="chart" width="300" height="400" @loaded="onChartLoaded"> </LineChart>

import { LineChart } from '@nativescript-community/ui-chart/charts/LineChart';
import { LineDataSet } from '@nativescript-community/ui-chart/data/LineDataSet';
import { LineData } from '@nativescript-community/ui-chart/data/LineData';

onChartLoaded() {
    const chart = this.$refs.chart['nativeView'] as LineChart;
    chart.backgroundColor = 'white';

    chart.drawGridBackground = false;

    // enable scaling and dragging
    chart.dragEnabled = true;
    chart.scaleEnabled = true;

    // force pinch zoom along both axis
    chart.petPinchZoomEnabled = true;

    // disable dual axis (only use LEFT axis)
    chart.axisRight.enabled = false;

    const myData = new Array(500).fill(0).map((v, i) => ({
        index: i,
        value: Math.random() * 1,
    }));

    const sets = [];
    const set = new LineDataSet(myData, 'Legend Label', 'index', 'value');
    set.setColor('blue');
    sets.push(set);

    // Create a data object with the data sets
    const ld = new LineData(sets);

    // Set data
    chart.data = ld;
}

NativeScript + Angular

Register the element in app.module.ts

registerElement('LineChart', () => require('@nativescript-community/ui-chart').LineChart);

<LineChart width="300" height="400" (loaded)="onChartLoaded($event)"> </LineChart>

import { LineChart } from '@nativescript-community/ui-chart/charts/LineChart';
import { LineDataSet } from '@nativescript-community/ui-chart/data/LineDataSet';
import { LineData } from '@nativescript-community/ui-chart/data/LineData';

onChartLoaded(args) {
    const chart = args.object as LineChart;
    chart.backgroundColor = 'white';

    chart.drawGridBackground = false;

    // enable scaling and dragging
    chart.dragEnabled = true;
    chart.scaleEnabled = true;

    // force pinch zoom along both axis
    chart.petPinchZoomEnabled = true;

    // disable dual axis (only use LEFT axis)
    chart.axisRight.enabled = false;

    const myData = new Array(500).fill(0).map((v, i) => ({
        index: i,
        value: Math.random() * 1,
    }));

    const sets = [];
    const set = new LineDataSet(myData, 'Legend Label', 'index', 'value');
    set.color = 'blue';
    sets.push(set);

    // Create a data object with the data sets
    const ld = new LineData(sets);

    // Set data
    chart.data = ld;
}

About

This plugin is based on MPAndroidChart, a powerful & easy to use chart library. Therefore, special thanks goes to Philipp Jahoda, the creator of MPAndroidChart and the rest of his team.

Instead of directly importing existing native libraries, this library has been rewritten in TypeScript, using @nativescript-community/ui-canvas plugin API as a basis. Plugin 'ui-canvas' is an extremely powerful tool that converts Android Native Canvas API to a cross-platform API for NativeScript framework. In few words, 'ui-chart' has the same code-base for both Android and iOS.

Additionally, @nativescript-community/gesturehandler plugin is used for handling chart gestures.

In short, these are the benefits of rewriting library into a NativeScript plugin:

• Same codebase for Android and iOS. Makes maintaining the library very easy.
• Smaller apps size because there are no native libs or native frameworks to consume space. All done with the power of {N}

Originally, the main goal was to prevent the need for marshalling all datasets. This is extremely heavy, costly and unnecessary!

Upon running demo samples, one can conclude it is the fastest drawing library, in comparison to nativescript-ui-chart and nativescript-mpchart.

That is because:

• It does not marshal or recreate any subset of the data sets, but directly uses the provided array instead
• It can share the same data array between multiple datasets
• It can still use the power of native arrays to NOT marshal arrays of positions while drawing lines with @nativescript-community/ui-canvas

Documentation

The NativeScript 'ui-chart' plugin is based on the MPAndroidChart library. In few words, its API is identical. The possibility to add API reference will be considered in the future.