Dart Documentationbox2d_htmlMassData

MassData class

This holds the mass data computed for a shape.

class MassData {
  /** The mass of the shape, usually in kilograms. */
  num mass;

  /** The position of the shape's centroid relative to the shape's origin. */
  Vector center;

  /** The rotational inertia of the shape about the local origin. */
  num inertia;

  /**
   * Constructs a blank mass data.
   */
  MassData() :
    mass = 0,
    inertia = 0,
    center = new Vector() { }

  /**
   * Copies from the given mass data.
   */
  MassData.copy(MassData md) :
    mass = md.mass,
    inertia = md.inertia,
    center = new Vector.copy(md.center) { }

  /**
   * Sets this mass data equal to the given mass data.
   */
  void setFrom(MassData md) {
    mass = md.mass;
    inertia = md.inertia;
    center.setFrom(md.center);
  }
}

Constructors

new MassData() #

Constructs a blank mass data.

MassData() :
  mass = 0,
  inertia = 0,
  center = new Vector() { }

new MassData.copy(MassData md) #

Copies from the given mass data.

MassData.copy(MassData md) :
  mass = md.mass,
  inertia = md.inertia,
  center = new Vector.copy(md.center) { }

Properties

Vector center #

The position of the shape's centroid relative to the shape's origin.

Vector center;

num inertia #

The rotational inertia of the shape about the local origin.

num inertia;

num mass #

The mass of the shape, usually in kilograms.

num mass;

final Type runtimeType #

inherited from Object

A representation of the runtime type of the object.

external Type get runtimeType;

Operators

bool operator ==(other) #

inherited from Object

The equality operator.

The default behavior for all Objects 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() #

inherited from Object

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 MassData() #

Constructs a blank mass data.

MassData() :
  mass = 0,
  inertia = 0,
  center = new Vector() { }

new MassData.copy(MassData md) #

Copies from the given mass data.

MassData.copy(MassData md) :
  mass = md.mass,
  inertia = md.inertia,
  center = new Vector.copy(md.center) { }

noSuchMethod(String name, List args) #

inherited from Object

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() #

inherited from 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(MassData md) #

Sets this mass data equal to the given mass data.

void setFrom(MassData md) {
  mass = md.mass;
  inertia = md.inertia;
  center.setFrom(md.center);
}

String toString() #

inherited from Object

Returns a string representation of this object.

external String toString();