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pub package

chart_sparkline

Beautiful sparkline charts for Flutter.

screenshot

Installation

Install the latest version from pub.

Quick Start

Import the package, create a Sparkline , and pass it your data.

import 'package:flutter/material.dart';
import 'package:chart_sparkline/chart_sparkline.dart';

void main() {
  var data = [0.0, 1.0, 1.5, 2.0, 0.0, 0.0, -0.5, -1.0, -0.5, 0.0, 0.0];
  runApp(
    MaterialApp(
      home: Scaffold(
        body: Center(
          child: Container(
            width: 300.0,
            height: 100.0,
            child: Sparkline(
              data: data,
            ),
          ),
        ),
      ),
    ),
  );
}

base example screenshot

Customization

Sparkline

Property Default
lineWidth 2.0
lineColor Colors.lightBlue
lineGradient null

Example:

Sparkline(
  data: data,
  lineWidth: 5.0,
  lineColor: Colors.purple,
);

lineopts example screenshot

Sparkline(
  data: data,
  lineWidth: 10.0,
  lineGradient: LinearGradient(
    begin: Alignment.topCenter,
    end: Alignment.bottomCenter,
    colors: [Colors.purple[800], Colors.purple[200]],
  ),
);

lineopts example screenshot


Points

Property Default
pointsMode PointsMode.none
pointSize 4.0
pointColor Colors.lightBlue[800]
pointIndex null
PointsMode Description
none (default) Do not draw individual points.
all Draw all the points in the data set.
last Draw only the last point in the data set.
atIndex Draw one point at the index specified by pointIndex.

Example:

Sparkline(
  data: data,
  pointsMode: PointsMode.all,
  pointSize: 8.0,
  pointColor: Colors.amber,
);

all points example screenshot

Sparkline(
  data: data,
  pointsMode: PointsMode.last,
  pointSize: 8.0,
  pointColor: Colors.amber,
);

last point example screenshot

Sparkline(
  data: data,
  pointsMode: PointsMode.atIndex,
  pointIndex: 7,
  pointSize: 8.0,
  pointColor: Colors.amber,
);

Fill

Property Default
fillMode FillMode.none
fillColor Colors.lightBlue[200]
fillGradient null
FillMode Description
none (default) Do not fill, draw only the sparkline.
above Fill the area above the sparkline.
below Fill the area below the sparkline.

Example:

Sparkline(
  data: data,
  fillMode: FillMode.below,
  fillColor: Colors.red[200],
);

fill below example screenshot

Sparkline(
  data: data,
  fillMode: FillMode.above,
  fillColor: Colors.red[200],
);

fill above example screenshot

Sparkline(
  data: data,
  fillMode: FillMode.below,
  fillGradient: LinearGradient(
    begin: Alignment.topCenter,
    end: Alignment.bottomCenter,
    colors: [Colors.red[800], Colors.red[200]],
  ),
);

fill above example screenshot

Smoothing

Sparkline(
  data: data,
  useCubicSmoothing: true,
  cubicSmoothingFactor: 0.2,
),

cubic smoothing example screenshot

Average Line

Sparkline(
  data: data,
  averageLine: true,
  averageLabel: true,
),

cubic smoothing example screenshot

first, last, highest and the lowest

Sparkline(
  data: data,
  kLine: ['max', 'min', 'first', 'last'],
),

cubic smoothing example screenshot

gridLine

Sparkline(
  gridLinelabelPrefix: '\$',
  gridLineLabelPrecision: 3,
  enableGridLines: true,
),

cubic smoothing example screenshot


Todo:

  • simple sparkline
  • custom line width
  • custom line color
  • optional rounded corners
  • fill
  • embiggen individual points/change color
  • different points modes [all/last/none]
  • animate between two sparklines
  • animate drawing a single sparkline
  • gesture detector to select closest point to tap
  • baseline
  • different fill modes [above/below/none]
  • fix edge points overflowing by offsetting by lineWidth
  • better corner rounding
  • axis labels
  • gradient shader on line paint
  • gradient shader on fill paint
  • multiple overlapping sparklines on a shared axis
  • tests

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Beautiful sparkline charts for Flutter

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  • Dart 93.6%
  • HTML 4.1%
  • Swift 2.3%