CirclePainter class

A CustomPainter that creates an animated circle effect around text.

Supports two modes:

Organic Mode: Wavy, hand-drawn look.
Plain Mode: Smooth, structured ellipse.

The animation starts at the right side and progressively completes three full circles.

Example Usage:

CustomPaint(
  painter: CirclePainter(
    text: "Flutter",
    textStyle: TextStyle(fontSize: 24, color: Colors.black),
    circleColor: Colors.blue,
    animationValue: 1.0,  // 100% completed animation
    precomputedOffsets: List.generate(1000, (index) => Random().nextDouble()),
    animationMode: SketchyAnimationMode.organic, // or SketchyAnimationMode.plain
  ),
  child: Text("Flutter", style: TextStyle(fontSize: 24, color: Colors.black)),
)

Inheritance

Constructors

CirclePainter.new({required String text, required TextStyle textStyle, required Color circleColor, required double animationValue, required List<double> precomputedOffsets, SketchyAnimationMode animationMode = SketchyAnimationMode.organic}): Creates a CirclePainter to draw an animated sketchy or smooth circle.

Properties

animationMode → SketchyAnimationMode: Determines whether the circle is sketchy or plain.
final
animationValue → double: Controls the animation progress (0 to 3 full circles).
final
circleColor → Color: The color of the animated circle.
final
hashCode → int: The hash code for this object.
no setterinherited
precomputedOffsets → List<double>: A list of random offsets for Organic Mode.
final
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
semanticsBuilder → SemanticsBuilderCallback?: Returns a function that builds semantic information for the picture drawn by this painter.
no setterinherited
text → String: The text to be circled.
final
textStyle → TextStyle: The text style used for measuring dimensions.
final

Methods

addListener(VoidCallback listener) → void: Register a closure to be notified when it is time to repaint.
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
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 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).
override
toString() → String: A string representation of this object.
inherited

Operators

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