graph_widget

Graph Widget package

Getting Started

For installing tips see Installing section.

2. Usage

  • Setup variables and GraphParams. Here you can setup your Graph.(For details look at 3. Graph Params) For example:
  • Create a GlobalKey:
GlobalKey<GraphWidgetInternalState> widgetKey = GlobalKey();
  • Create a List:
List<GraphPoint> values = List();
for (int i = 0; i < 100; i++) {
      var rng = new Random();
      values.add(GraphPoint(x: i.toDouble(), y: rng.nextInt(500).toDouble()));
    }
  • Setup GraphParams:
GraphParams params = GraphParams(
        graphPoints: values,
        height: 200.0,
        width: GraphConst.WRAP,
        top: 16.0,
       yGridSize: 10,
        yScale: GraphConst.AUTO,
        xScale: 10,
        startOverScroll: 0.0,
        endOverScroll: 0.0,
        enableRoundCorners: false,
        enableFill: false,
        enableMarks: false,
        enableGrid: false,
        enableScroll: true,
        textStyle: getTextStyle(),
        marksBgdPaint: _getMarksBgd(),
        gradient: _getGradient());
  • Next Setup a Widget For example:
    GraphWidget(widgetKey: widgetKey, params: params)
  • For scroll or move Graph you can use functions:
 widgetKey.currentState.moveTo(int position);

or

 widgetKey.currentState.scrollTo(int position);

Note: position is index in list

3. Graph Params

  • Points of Graph. Array of GraphPoint(x: value, y: value)
List<GraphPoint> graphPoints
  • Left (X) widget offset. Default is 0.0.
double left
  • Top (Y) widget offset. Default is 0.0.
double top
  • Additional free area for scrolling before Graph. Default is 0.0.
double startOverScroll
  • Additional free area for scrolling after Graph. Default is 0.0.
double endOverScroll
  • Count of grid lines at Y coordinate. Default is 10.
int yGridSize
  • Duration of scroll animation in milliseconds
int scrollDuration
  • Points radius double
double pointRadius
  • Max point at screen at X coordinate Using only when scrolling is enabled; To use Y scale size depending on Graph max value - use GraphConst.AUTO.
int yScale
  • Max point of Y coordinate
int xScale
  • Show markings every X value For example: showMarkingsEveryX = 5; ,markings = 5,10,15 etc to enable all markings set showMarkingsEveryX to 0.
int showMarkingsEveryX
  • Enable or disable rounding Graph corners.

Disabled by default.

bool enableRoundCorners
  • Enable or disable fill Graph with paint or Gradient. Disabled by default.
bool enableFill
  • Enable or disable text markings at the bottom of Graph. Disabled by default.
bool enableMarks
  • Enable or disable grid. Disabled by default.
bool enableGrid
  • Enable or disable scrolling. Disabled by default.
bool enableScroll
  • Enable or disable scroll fling. Disabled by default.
bool enableFling
  • Enable or disable points. Disabled by default.
bool enablePoints
  • Widget height. To use screen height use GraphConst.WRAP.
double height
  • Widget width. To use screen width use GraphConst.WRAP.
double width
  • Paint of Graph.
Paint mainLinePaint
  • Gradient of Graph paint.
Gradient gradient
  • Paint of Grid.
Paint gridPaint
  • Paint of Point at Graph.
Paint pointsPaint
  • Paint of background.
Paint bgdPaint
  • Paint of Markings background.
Paint marksBgdPaint
  • Markings text style UI.TextStyle.
UI.TextStyle textStyle

Libraries

bloc_base
graph_widget
provider
widget_bloc