CircleShape class
A shape commonly known as the circle.
class CircleShape extends Shape { /** * The current position of the center of this circle. */ final Vector position; /** * A constructor for internal use only. Instead use Body.createShape with a * CircleDef. */ CircleShape() : super(ShapeType.CIRCLE, 0), position = new Vector() { } /** * Constructs a new CircleShape equal to the given CircleShape. */ CircleShape.copy(CircleShape other) : super(other.type, other.radius), position = new Vector.copy(other.position) { } /** * Returns true if the point is contained in the given shape when the given * rotation transform is applied. Implements superclass abstract method of * the same name. */ bool testPoint(Transform transform, Vector point) { Vector center = new Vector(); transform.rotation.multiplyVectorToOut(position, center); center.addLocal(transform.position); Vector d = center.subLocal(point).negateLocal(); return Vector.dot(d, d) <= radius * radius; } /** * Compute the axis aligned box for this Shape when the given transform is * applied. Stores the result in the given box. */ void computeAxisAlignedBox(AxisAlignedBox argBox, Transform argTransform) { Vector p = new Vector(); Matrix22.mulMatrixAndVectorToOut(argTransform.rotation, position, p); p.addLocal(argTransform.position); argBox.lowerBound.setCoords(p.x - radius, p.y - radius); argBox.upperBound.setCoords(p.x + radius, p.y + radius); } /** Returns a clone of this circle. */ Shape clone() => new CircleShape.copy(this); /** * Computes the mass properties of this Circle at the given density and stores * the result in the given MassData object. */ void computeMass(MassData massData, num density) { massData.mass = density * Math.PI * radius * radius; massData.center.setFrom(position); // Store inertia above the local origin. massData.inertia = massData.mass * (.5 * radius * radius + Vector.dot(position, position)); } }
Extends
Shape > CircleShape
Constructors
new CircleShape() #
A constructor for internal use only. Instead use Body.createShape with a CircleDef.
CircleShape() : super(ShapeType.CIRCLE, 0), position = new Vector() { }
new CircleShape.copy(CircleShape other) #
Constructs a new CircleShape equal to the given CircleShape.
CircleShape.copy(CircleShape other) : super(other.type, other.radius), position = new Vector.copy(other.position) { }
Properties
final Type runtimeType #
A representation of the runtime type of the object.
external Type get runtimeType;
Operators
bool operator ==(other) #
The equality operator.
The default behavior for all Object
s is to return true if and
only if this
and
other are the same object.
If a subclass overrides the equality operator it should override
the hashCode
method as well to maintain consistency.
bool operator ==(other) => identical(this, other);
Methods
new CircleShape() #
A constructor for internal use only. Instead use Body.createShape with a CircleDef.
CircleShape() : super(ShapeType.CIRCLE, 0), position = new Vector() { }
new CircleShape.copy(CircleShape other) #
Constructs a new CircleShape equal to the given CircleShape.
CircleShape.copy(CircleShape other) : super(other.type, other.radius), position = new Vector.copy(other.position) { }
void computeAxisAlignedBox(AxisAlignedBox argBox, Transform argTransform) #
Compute the axis aligned box for this Shape when the given transform is applied. Stores the result in the given box.
void computeAxisAlignedBox(AxisAlignedBox argBox, Transform argTransform) { Vector p = new Vector(); Matrix22.mulMatrixAndVectorToOut(argTransform.rotation, position, p); p.addLocal(argTransform.position); argBox.lowerBound.setCoords(p.x - radius, p.y - radius); argBox.upperBound.setCoords(p.x + radius, p.y + radius); }
void computeMass(MassData massData, num density) #
Computes the mass properties of this Circle at the given density and stores the result in the given MassData object.
void computeMass(MassData massData, num density) { massData.mass = density * Math.PI * radius * radius; massData.center.setFrom(position); // Store inertia above the local origin. massData.inertia = massData.mass * (.5 * radius * radius + Vector.dot(position, position)); }
int hashCode() #
Get a hash code for this object.
All objects have hash codes. Hash codes are guaranteed to be the
same for objects that are equal when compared using the equality
operator ==
. Other than that there are no guarantees about
the hash codes. They will not be consistent between runs and
there are no distribution guarantees.
If a subclass overrides hashCode
it should override the
equality operator as well to maintain consistency.
external int hashCode();
noSuchMethod(String name, List args) #
noSuchMethod
is invoked when users invoke a non-existant method
on an object. The name of the method and the arguments of the
invocation are passed to noSuchMethod
. If noSuchMethod
returns a value, that value becomes the result of the original
invocation.
The default behavior of noSuchMethod
is to throw a
noSuchMethodError
.
external Dynamic noSuchMethod(String name, List args);
const Object() #
Creates a new Object
instance.
Object
instances have no meaningful state, and are only useful
through their identity. An Object
instance is equal to itself
only.
const Object();
new Shape([int type = ShapeType.UNKNOWN, num radius = 0]) #
Constructs a new shape of unknown type.
Shape([int type = ShapeType.UNKNOWN, num radius = 0]) : type = type, radius = radius { }
bool testPoint(Transform transform, Vector point) #
Returns true if the point is contained in the given shape when the given rotation transform is applied. Implements superclass abstract method of the same name.
bool testPoint(Transform transform, Vector point) { Vector center = new Vector(); transform.rotation.multiplyVectorToOut(position, center); center.addLocal(transform.position); Vector d = center.subLocal(point).negateLocal(); return Vector.dot(d, d) <= radius * radius; }
String toString() #
Returns a string representation of this object.
external String toString();