Beautiful sparkline charts for Flutter
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Latest commit 740e353 Sep 6, 2018

README.md

pub package

flutter_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:flutter_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(
    new MaterialApp(
      home: new Scaffold(
        body: new Center(
          child: new Container(
            width: 300.0,
            height: 100.0,
            child: new Sparkline(
              data: data,
            ),
          ),
        ),
      ),
    ),
  );
}

base example screenshot

Customization

Sparkline

Property Default
lineWidth 2.0
lineColor Colors.lightBlue
lineGradient null

Example:

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

lineopts example screenshot

new Sparkline(
  data: data,
  lineWidth: 10.0,
  lineGradient: new 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]
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:

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

all points example screenshot

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

last point example screenshot


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:

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

fill below example screenshot

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

fill above example screenshot

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

fill above 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