Morph class

An animation between two RoundedPolygon shapes.

Morphing between arbitrary objects can be problematic because it can be difficult to determine how the points of a given shape map to the points of some other shape. Morph simplifies the problem by only operating on RoundedPolygon objects, which are known to have similar, contiguous structures. For one thing, the shape of a polygon is contiguous from start to end (compared to an arbitrary Path object, which could have one or more moveTo operations in the shape). Also, all edges of a polygon shape are represented by CubicBezier objects, thus the start and end shapes use similar operations. Two Polygon shapes then only differ in the quantity and placement of their curves. The morph works by determining how to map the curves of the two shapes together (based on proximity and other information, such as distance to polygon vertices and concavity), and splitting curves when the shapes do not have the same number of curves or when the curve placement within the shapes is very different.

Annotations

• @immutable

Constructors

Morph(RoundedPolygon start, RoundedPolygon end)

Creates a Morph between the start and end polygons.

Properties

end → RoundedPolygon

The shape this morph produces at a progress of 1.

final

hashCode → int

The hash code for this object.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

start → RoundedPolygon

The shape this morph produces at a progress of 0.

final

Methods

calculateApproximateBounds() → Rect

A cheaper alternative to calculateBounds, based on the min/max values of all anchor and control points that make up the two shapes.

calculateBounds() → Rect

Calculates the axis-aligned bounds of this morph, covering both of its shapes.

calculateMaxBounds() → Rect

Like calculateBounds, calculates the axis-aligned bounds of this morph, but determines the max dimension of the shapes (by calculating the distance from their center to the start and midpoint of each curve) and returns a square which can be used to hold the morph in any rotation.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toCubics(double progress) → List<CubicBezier>

Returns this morph's shape at progress as a list of CubicBeziers.

toPath(double progress, {double startAngle = 0.0, bool repeatPath = false, bool closePath = true, Offset rotationPivot = .zero, Path? path}) → Path

Returns a Path for this morph's shape at progress.

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

override