MaterialPointArcTween class

A Tween that interpolates an Offset along a circular arc.

This class specializes the interpolation of Tween<Offset> so that instead of a straight line, the intermediate points follow the arc of a circle in a manner consistent with Material Design principles.

The arc's radius is related to the bounding box that contains the begin and end points. If the bounding box is taller than it is wide, then the center of the circle will be horizontally aligned with the end point. Otherwise the center of the circle will be aligned with the begin point. The arc's sweep is always less than or equal to 90 degrees.

See also:

Inheritance

Constructors

MaterialPointArcTween({Offset? begin, Offset? end})
Creates a Tween for animating Offsets along a circular arc.

Properties

begin ↔ Offset?
The value this variable has at the beginning of the animation.
getter/setter pairinherited-getteroverride-setter
beginAngle → double?
The beginning of the arc's sweep in radians, measured from the positive x axis. Positive angles turn clockwise.
no setter
center → Offset?
The center of the circular arc, null if begin and end are horizontally or vertically aligned, or if either is null.
no setter
end ↔ Offset?
The value this variable has at the end of the animation.
getter/setter pairinherited-getteroverride-setter
endAngle → double?
The end of the arc's sweep in radians, measured from the positive x axis. Positive angles turn clockwise.
no setter
hashCode → int
The hash code for this object.
no setterinherited
radius → double?
The radius of the circular arc, null if begin and end are horizontally or vertically aligned, or if either is null.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

animate(Animation<double> parent) → Animation<Offset>
Returns a new Animation that is driven by the given animation but that takes on values determined by this object.
inherited
chain(Animatable<double> parent) → Animatable<Offset>
Returns a new Animatable whose value is determined by first evaluating the given parent and then evaluating this object.
inherited
evaluate(Animation<double> animation) → Offset
The current value of this object for the given Animation.
inherited
lerp(double t) → Offset
Returns the value this variable has at the given animation clock value.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
override
transform(double t) → Offset
Returns the interpolated value for the current value of the given animation.
inherited

Operators

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