MorphShapePainter class

A CustomPainter that morphs between two paths by interpolating sampled points.

Both fromPath and toPath are resampled to sampleCount evenly spaced points, then each point is linearly interpolated using progress. This produces smooth shape-to-shape transitions regardless of the original point counts.

{@tool snippet}

CustomPaint(
  painter: MorphShapePainter(
    fromPath: circlePath,
    toPath: starPath,
    progress: controller.value,
    color: Colors.white,
  ),
)

{@end-tool}

Inheritance

Constructors

MorphShapePainter({required Path fromPath, required Path toPath, required double progress, required Color color, double strokeWidth = 2.0, bool filled = false, int sampleCount = 100})
Creates a MorphShapePainter.

Properties

color → Color
The stroke or fill color.
final
filled → bool
Whether to fill the interpolated shape instead of stroking it.
final
fromPath → Path
The starting shape path.
final
hashCode → int
The hash code for this object.
no setterinherited
progress → double
Interpolation progress from 0.0 (fromPath) to 1.0 (toPath).
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
sampleCount → int
The number of evenly spaced points sampled along each path.
final
semanticsBuilder → SemanticsBuilderCallback?
Returns a function that builds semantic information for the picture drawn by this painter.
no setterinherited
strokeWidth → double
The stroke width used when filled is false.
final
toPath → Path
The target shape path.
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 MorphShapePainter 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