Manifold class
A manifold for two touching convex shapes. Box2D has support for many kinds of contact, such as clip pont versus plain with radius and point versus point with radius (as with circles).
class Manifold { /** The points of contact. */ final List<ManifoldPoint> points; /** * The meaning of the localNormal depends on the type of this manifold. The * different meanings (or lack thereof) are outlined below. * Circles: not used. * faceA: The normal on polygonA. * faceB: The normal on polygonB. */ final Vector localNormal; /** * The meaning of the localPoint depends on the type of this manifold. The * different meanings (or lack thereof) are outlined below. * Circles: The local center of circleA. * faceA: The center of faceA. * faceB: The center of faceB. */ final Vector localPoint; /** The type of manifold. See [ManifoldType]. */ int type; /** The number of manifold points. */ int pointCount; /** * Creates a manifold with 0 points. It's point array should be full of * already instantiated ManifoldPoints. */ Manifold() : points = new List<ManifoldPoint>(Settings.MAX_MANIFOLD_POINTS), localNormal = new Vector(), localPoint = new Vector(), pointCount = 0 { for (int i = 0; i < Settings.MAX_MANIFOLD_POINTS; ++i) points[i] = new ManifoldPoint(); } /** * Creates a new manifold that is a copy of the given manifold. */ Manifold.copy(Manifold other) : points = new List<ManifoldPoint>(Settings.MAX_MANIFOLD_POINTS), localNormal = new Vector.copy(other.localNormal), localPoint = new Vector.copy(other.localPoint), pointCount = other.pointCount, type = other.type { for (int i = 0; i < Settings.MAX_MANIFOLD_POINTS; ++i) points[i] = new ManifoldPoint.copy(other.points[i]); } /** * Sets this manifold to be a copy of the given manifold. */ void setFrom(Manifold other) { for (int i = 0; i < other.pointCount; ++i) points[i].setFrom(other.points[i]); type = other.type; localNormal.setFrom(other.localNormal); localPoint.setFrom(other.localPoint); pointCount = other.pointCount; } }
Constructors
new Manifold() #
Creates a manifold with 0 points. It's point array should be full of already instantiated ManifoldPoints.
Manifold() : points = new List<ManifoldPoint>(Settings.MAX_MANIFOLD_POINTS), localNormal = new Vector(), localPoint = new Vector(), pointCount = 0 { for (int i = 0; i < Settings.MAX_MANIFOLD_POINTS; ++i) points[i] = new ManifoldPoint(); }
new Manifold.copy(Manifold other) #
Creates a new manifold that is a copy of the given manifold.
Manifold.copy(Manifold other) : points = new List<ManifoldPoint>(Settings.MAX_MANIFOLD_POINTS), localNormal = new Vector.copy(other.localNormal), localPoint = new Vector.copy(other.localPoint), pointCount = other.pointCount, type = other.type { for (int i = 0; i < Settings.MAX_MANIFOLD_POINTS; ++i) points[i] = new ManifoldPoint.copy(other.points[i]); }
Properties
final Vector localNormal #
The meaning of the localNormal depends on the type of this manifold. The different meanings (or lack thereof) are outlined below. Circles: not used. faceA: The normal on polygonA. faceB: The normal on polygonB.
final Vector localNormal;
final Vector localPoint #
The meaning of the localPoint depends on the type of this manifold. The different meanings (or lack thereof) are outlined below. Circles: The local center of circleA. faceA: The center of faceA. faceB: The center of faceB.
final Vector localPoint;
int pointCount #
The number of manifold points.
int pointCount;
final List<ManifoldPoint> points #
The points of contact.
final List<ManifoldPoint> points;
final Type runtimeType #
A representation of the runtime type of the object.
external Type get runtimeType;
int type #
The type of manifold. See ManifoldType.
int type;
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
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();
new Manifold() #
Creates a manifold with 0 points. It's point array should be full of already instantiated ManifoldPoints.
Manifold() : points = new List<ManifoldPoint>(Settings.MAX_MANIFOLD_POINTS), localNormal = new Vector(), localPoint = new Vector(), pointCount = 0 { for (int i = 0; i < Settings.MAX_MANIFOLD_POINTS; ++i) points[i] = new ManifoldPoint(); }
new Manifold.copy(Manifold other) #
Creates a new manifold that is a copy of the given manifold.
Manifold.copy(Manifold other) : points = new List<ManifoldPoint>(Settings.MAX_MANIFOLD_POINTS), localNormal = new Vector.copy(other.localNormal), localPoint = new Vector.copy(other.localPoint), pointCount = other.pointCount, type = other.type { for (int i = 0; i < Settings.MAX_MANIFOLD_POINTS; ++i) points[i] = new ManifoldPoint.copy(other.points[i]); }
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();
void setFrom(Manifold other) #
Sets this manifold to be a copy of the given manifold.
void setFrom(Manifold other) { for (int i = 0; i < other.pointCount; ++i) points[i].setFrom(other.points[i]); type = other.type; localNormal.setFrom(other.localNormal); localPoint.setFrom(other.localPoint); pointCount = other.pointCount; }
String toString() #
Returns a string representation of this object.
external String toString();