ScatterChartPainter class

A custom painter for rendering scatter charts.

This painter handles the rendering of scatter charts including:

  • Multiple data series with different point styles
  • Interactive selection and hover states
  • Customizable point sizes and shapes
  • Professional grid and axis rendering
Inheritance

Constructors

ScatterChartPainter({required ChartTheme theme, required List<ChartDataSet> dataSets, bool showGrid = true, bool showAxis = true, bool showLabel = true, double pointSize = 8.0, double animationProgress = 1.0, ChartInteractionResult? selectedPoint, ChartInteractionResult? hoveredPoint})
Creates a scatter chart painter.
const

Properties

animationProgress → double
The animation progress value between 0.0 and 1.0.
final
dataSets → List<ChartDataSet>
The data sets to render in the chart.
finalinherited
hashCode → int
The hash code for this object.
no setterinherited
hoveredPoint → ChartInteractionResult?
The currently hovered point interaction result.
final
pointSize → double
The size of each scatter point in pixels.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
selectedPoint → ChartInteractionResult?
The currently selected point interaction result.
final
semanticsBuilder → SemanticsBuilderCallback?
Returns a function that builds semantic information for the picture drawn by this painter.
no setterinherited
showAxis → bool
Whether to show axis lines.
finalinherited
showGrid → bool
Whether to show grid lines.
finalinherited
showLabel → bool
Whether to show axis labels.
finalinherited
theme → ChartTheme
The theme to use for styling the chart.
finalinherited

Methods

addListener(VoidCallback listener) → void
Register a closure to be notified when it is time to repaint.
inherited
drawAxes(Canvas canvas, Size size, double minX, double maxX, double minY, double maxY) → void
Draw axis lines.
inherited
drawAxisLabels(Canvas canvas, Size size, double minX, double maxX, double minY, double maxY, {List<ChartDataSet>? dataSets}) → void
Draw axis labels (optimized with text style caching).
inherited
drawGrid(Canvas canvas, Size size, double minX, double maxX, double minY, double maxY) → void
Draw grid lines (optimized with batched operations).
inherited
getDataBounds(double getValue(ChartDataPoint), double combine(double, double)) → void
Get data bounds (to be overridden by subclasses).
inherited
getNiceMaxY(double maxY, {int targetIntervals = 5}) → double
Helper to calculate a "nice" maximum Y value for axis scaling.
inherited
hitTest(Offset position) → bool?
Called whenever a hit test is being performed on an object that is using this custom paint delegate.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
paint(Canvas canvas, Size size) → void
Called whenever the object needs to paint. The given Canvas has its coordinate space configured such that the origin is at the top left of the box. The area of the box is the size of the size argument.
override
pointToCanvas(ChartDataPoint point, Size size, double minX, double maxX, double minY, double maxY) → Offset
Convert data point to canvas coordinates (optimized).
inherited
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that the object notifies when it is time to repaint.
inherited
shouldRebuildSemantics(covariant CustomPainter oldDelegate) → bool
Called whenever a new instance of the custom painter delegate class is provided to the RenderCustomPaint object, or any time that a new CustomPaint object is created with a new instance of the custom painter delegate class (which amounts to the same thing, because the latter is implemented in terms of the former).
inherited
shouldRepaint(covariant ScatterChartPainter oldDelegate) → bool
Called whenever a new instance of the custom painter delegate class is provided to the RenderCustomPaint object, or any time that a new CustomPaint object is created with a new instance of the custom painter delegate class (which amounts to the same thing, because the latter is implemented in terms of the former).
override
toString() → String
A string representation of this object.
inherited

Operators

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