k_chart_plus 1.0.4

A Flutter Charts library which paint candle chart(support select multi secondary state), depth chart in Exchange Application.

K Chart Plus Package

Feature

Maybe this is the best k chart in Flutter.Support drag,scale,long press,fling.And easy to use.

Example1	Example2

Installation

First, add k_chart_plus as a dependency in your pubspec.yaml file.

k_chart_plus: ^1.0.4

If you don't want to support selecting multiple secondary states, you need to use:

k_chart_plus:
   git:
     url: https://github.com/TrangLeQuynh/k_chart_plus
     ref: single #branch name

Usage

Use K line chart

Indicator definitions (main & secondary). indicatorStyle and calcParams can be customized, subject to indicator support.

final List<MainIndicator> _mainIndicators = [
  MAIndicator(
    calcParams: [5, 10, 30, 60], // [Optional] Display of MA. Default is [5, 10, 30, 60]
  ),  
  EMAIndicator(
    calcParams: [5, 10, 30, 60], // [Optional] Display of EMA. Default is [5, 10, 30, 60]
  ),
  BOLLIndicator(),
  SARIndicator(),
];

final List<SecondaryIndicator> _secondaryIndicators = [
  MACDIndicator(),
  KDJIndicator(),
  RSIIndicator(),
  WRIndicator(),
  CCIIndicator(),
];

Compute K chart data based on the selected indicators

DataUtil.calculateAll(
  datas,
  _mainIndicators,
  _secondaryIndicators,
);

Paint K Chart

KChartWidget(
  datas, // Required，Data must be an ordered list，(history=>now)
  kchartStyle,  // Required for styling purposes
  kchartColors, // Required for styling purposes
  mBaseHeight: 350, // height of chart (not contain Vol and Secondary) 
  mSecondaryHeight: 80, // height of secondary chart
  isTrendLine: false, // You can use Trendline by long-pressing and moving your finger after setting true to isTrendLine property. 
  volHidden: _volHidden, // hide volume
  mainIndicators: _mainIndicators, // [mainIndicators] Decide what the main view shows
  secondaryIndicators: _secondaryIndicators, // [secondaryIndicators] Decide what the sub view shows
  fixedLength: 6,
  showNowPrice: true,// show now price
  timeFormat: TimeFormat.YEAR_MONTH_DAY,
  isOnDrag: (isDrag){}, // true is on Drag.Don't load data while Draging.
  xFrontPadding: 100 // padding in front
  detailBuilder: (entity) { // show detail popup 
    return PopupInfoView(
      entity: entity,
      chartColors: chartColors,
      fixedLength: 2,
    );
  },
),

Use Depth chart

DepthChart(
  _bids, 
  _asks, 
  depthColors, // config the depth chart colors
  chartStyle: depthStyle, // config the depth chart style
  chartTranslations: const DepthChartTranslations(
    price: 'Price',
    amount: 'Amount',
  ),
) //Note: Datas must be an ordered list，

Dark | Light Theme

ChartColor helped to set the color for the chart. You need to flexibly change according to your theme configuration to ensure UI.

If you need to apply multi theme, you need to change at least the colors related to the text, border, grid and background color

final themeData = Theme.of(context);
final textColor = themeData.textTheme.bodyMedium?.color ?? Colors.grey;
final hintTextColor = themeData.disabledColor;

/// Configure the depth chart style
DepthChartStyle depthStyle = DepthChartStyle();
DepthChartColors depthColors = DepthChartColors(
  upColor: const Color(0xFF1EBB43),
  upFillPathColor: const Color(0x1F2AC07F),
  dnColor: const Color(0xFFFF476B),
  dnFillPathColor: const Color(0x1FE22127),
  selectBorderColor: themeData.dividerColor,
  selectFillColor: themeData.cardColor,
  defaultTextColor: hintTextColor,
  annotationColor: textColor,
  crossColor: textColor.withAlpha(220),
  barrierColor: const Color(0x12202020)
);

/// Configure the k chart style
KChartStyle kchartStyle = KChartStyle();
KChartColors kchartColors = KChartColors(
  bgColor: themeData.scaffoldBackgroundColor,
  kLineColor: const Color(0xff217AFF),
  kLineFillColors : const [
    Color(0x80217aff),
    Color(0x00217AFF),
  ],

  ma5Color: const Color(0xFFFFC634),
  ma10Color: const Color(0xff35cdac),
  upColor: const Color(0xFF1EBB43),
  dnColor: const Color(0xFFFF476B),
  volColor: const Color(0xff2f8fd5),
  volUpColor: const Color(0xFF1EBB43), //0x4D31BD65
  volDnColor: const Color(0xFFFF476B), //0x4DE93057
  nowPriceUpColor: const Color(0xFF1EBB43),
  nowPriceDnColor: const Color(0xFFFF476B),
  trendLineColor: const Color(0xFFF89215),
  selectBorderColor: themeData.dividerColor,
  selectFillColor: themeData.inputDecorationTheme.fillColor ?? Colors.white,
  gridColor: themeData.dividerColor,
  crossColor: textColor.withAlpha(220),
  crossTextColor: textColor,
  defaultTextColor: hintTextColor,
  maxColor: textColor,
  minColor: textColor,
);

Thanks

gwhcn/flutter_k_chart

OpenFlutter/k_chart