SmoothLineChart class

Animated line chart with touch tooltips, optional reference lines, gradient fill and configurable formatters.

SmoothLineChart(
  points: [
    [ChartPair(0, 0), ChartPair(1, 120), ChartPair(2, 80)],
  ],
  color: Colors.teal,
  yLabelFormatter: (v) => '\$${v.toStringAsFixed(0)}',
)
Inheritance

Constructors

SmoothLineChart({Key? key, required List<List<ChartPair>> points, Color? color, List<Color> colors = const [], bool isCurved = false, DateTime? endDate, double? verticalLineAt, double? horizontalLineAt, bool enableTouch = true, bool keepHorizontalLineInView = false, double amountBefore = 0, bool removeZeroEntries = false, bool cumulativeMode = false, String yLabelFormatter(double value)?, String xLabelFormatter(DateTime date)?, String tooltipFormatter(DateTime date, double value)?, bool showTooltipForAllLines = false, String lineTooltipLabelBuilder(int lineIndex)?, Duration animationDuration = const Duration(milliseconds: 2000), Curve animationCurve = Curves.fastLinearToSlowEaseIn})
const

Properties

amountBefore → double
Starting y value before the first point (used to initialise the min/max bounds during the entrance animation).
final
animationCurve → Curve
Entrance animation curve for chart reveal.
final
animationDuration → Duration
Entrance animation duration for chart bounds and rendered lines.
final
color → Color?
Primary line color. Defaults to ColorScheme.primary.
final
colors → List<Color>
Per-line colors (overrides color when provided).
final
cumulativeMode → bool
Show running total instead of per-day values.
final
enableTouch → bool
final
endDate → DateTime?
Reference date for the rightmost data point label.
final
hashCode → int
The hash code for this object.
no setterinherited
horizontalLineAt → double?
Draws a dashed horizontal line at this y value.
final
isCurved → bool
final
keepHorizontalLineInView → bool
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
lineTooltipLabelBuilder → String Function(int lineIndex)?
Optional label builder used in multi-line tooltips. Defaults to "Line 1", "Line 2", ...
final
points → List<List<ChartPair>>
One inner list = one line on the chart.
final
removeZeroEntries → bool
Drop points where y == 0 (non-cumulative: skip, cumulative: flatten).
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
showTooltipForAllLines → bool
When true, shows one tooltip row per visible line at touched x. When false, only the first line tooltip is shown.
final
tooltipFormatter → String Function(DateTime date, double value)?
Format the tooltip text. Defaults to "date + newline + value". Receives (date, value).
final
verticalLineAt → double?
Draws a dashed vertical line at this x offset from the right.
final
xLabelFormatter → String Function(DateTime date)?
Format a date label on the x-axis. Defaults to "Mar 15" style.
final
yLabelFormatter → String Function(double value)?
Format a y-axis value. Defaults to compact number formatting.
final

Methods

build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
override
createElement() → StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
inherited
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String
A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited