ContactFilter class
Implement a subtype of this class and pass it as the argument to world.setContactFilter to provide collision filtering. In other words, you can implement this class if you want finer control over contact creation.
class ContactFilter { ContactFilter(); /** * Return true if contact calculations should be performed between these two * shapes. */ bool shouldCollide(Fixture fixtureA, Fixture fixtureB) { final Filter filterA = fixtureA.filter; final Filter filterB = fixtureB.filter; if (filterA.groupIndex != 0 && filterA.groupIndex == filterB.groupIndex) return filterA.groupIndex > 0; return (filterA.maskBits & filterB.categoryBits) != 0 && (filterA.categoryBits & filterB.maskBits) != 0; } }
Constructors
new ContactFilter() #
ContactFilter();
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 ContactFilter() #
ContactFilter();
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();
bool shouldCollide(Fixture fixtureA, Fixture fixtureB) #
Return true if contact calculations should be performed between these two shapes.
bool shouldCollide(Fixture fixtureA, Fixture fixtureB) { final Filter filterA = fixtureA.filter; final Filter filterB = fixtureB.filter; if (filterA.groupIndex != 0 && filterA.groupIndex == filterB.groupIndex) return filterA.groupIndex > 0; return (filterA.maskBits & filterB.categoryBits) != 0 && (filterA.categoryBits & filterB.maskBits) != 0; }
String toString() #
Returns a string representation of this object.
external String toString();