chart_sparkline

Beautiful sparkline charts for Flutter.

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,
            ),
          ),
        ),
      ),
    ),
  );
}

Customization

Sparkline

Property	Default
lineWidth	2.0
lineColor	Colors.lightBlue
lineGradient	null

Example:

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

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

---

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,
);

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

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],
);

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

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

Smoothing

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

Average Line

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

first, last, highest and the lowest

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

gridLine

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

---

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