chart_sparkline 1.0.4

Beautiful sparkline charts for Flutter.Average line, highest and lowest value.

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/flutter_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]

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.

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,
);

---

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,
  averageLable: 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