box2d_flame 0.4.1

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A Dart 2D physics engine

Build Status Coverage Status

This is a Dart port of Java's Box2D libraries.

The Java Box2D library was originally written by Daniel Murphy (status February 2015).

benchmark/bench2d.dart   Benchmark used by Joel Webber
example/index.html       Browser demos as written by Dominic Hamon
lib/                     Port of Daniel Murphy's jbox2d

First Dart port of an earlier version of Box2D library was done by Dominic Hamon. We are grateful for his work.

Not an official Google project


  • Breaking: Made package strong-mode compliant (with implicit-casts and implicit-dynamic off). This means many API points are now more strongly typed (num is now double). Fix errors by providing doubles where they are expected (1 will become 1.0 and num fraction = .5 will become double fraction = .5), and explicitly casting joints (world.createJoint(jointDef) as RevoluteJoint).
  • Pulled in optimizations and bug fixes from the original jbox2d project.
  • Made velocityThreshold mutable (as per jbox2d and other box2d implementations).


  • Updated to vector_math 2.0.0


  • Complete re-write. Many APIs have changed.

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  box2d_flame: ^0.4.1

2. Install it

You can install packages from the command line:

with pub:

$ pub get

Alternatively, your editor might support pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:box2d_flame/box2d.dart';
import 'package:box2d_flame/box2d_browser.dart';
Version Uploaded Documentation Archive
0.4.1 Jul 15, 2018 Go to the documentation of box2d_flame 0.4.1 Download box2d_flame 0.4.1 archive
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Learn more about scoring.

We analyzed this package on Aug 10, 2018, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.0.0
  • pana: 0.11.8


Detected platforms: web

Platform components identified in package: html.

Issues and suggestions

Fix lib/src/particle/particle_system.dart.

Analysis of lib/src/particle/particle_system.dart failed with 15 errors, including:

line 950 col 47: The getter 'MAX_FINITE' isn't defined for the class 'double'.

line 984 col 22: The getter 'MAX_FINITE' isn't defined for the class 'double'.

line 1012 col 58: The getter 'MAX_FINITE' isn't defined for the class 'double'.

line 1081 col 32: The getter 'MAX_FINITE' isn't defined for the class 'double'.

line 1082 col 32: The getter 'MAX_FINITE' isn't defined for the class 'double'.

Fix lib/src/collision/collision.dart.

Analysis of lib/src/collision/collision.dart failed with 6 errors, including:

line 358 col 33: The getter 'MAX_FINITE' isn't defined for the class 'double'.

line 540 col 36: The getter 'MAX_FINITE' isn't defined for the class 'double'.

line 547 col 26: The getter 'MAX_FINITE' isn't defined for the class 'double'.

line 603 col 28: The getter 'MAX_FINITE' isn't defined for the class 'double'.

line 1415 col 30: The getter 'MAX_FINITE' isn't defined for the class 'double'.

Add SDK constraint in pubspec.yaml.

For information about setting SDK constraint, please see

Fix additional 13 files with analysis or formatting issues.

Additional issues in the following files:

  • lib/src/settings.dart (8 errors)
  • lib/src/particle/voronoi_diagram.dart (4 errors)
  • lib/src/collision/aabb.dart (2 errors)
  • lib/src/math_utils.dart (2 errors)
  • lib/src/dynamics/profile.dart (2 errors)
  • lib/src/collision/broadphase/dynamic_tree.dart (1 error)
  • lib/src/collision/shapes/polygon_shape.dart (1 error)
  • lib/src/dynamics/island.dart (1 error)
  • lib/src/dynamics/joints/wheel_joint.dart (1 error)
  • lib/src/dynamics/joints/weld_joint.dart (1 error)
  • lib/src/dynamics/joints/distance_joint.dart (1 error)
  • lib/src/dynamics/joints/mouse_joint.dart (1 error)
  • lib/src/collision/shapes/circle_shape.dart (1 error)

The description is too short.

Add more detail about the package, what it does and what is its target use case. Try to write at least 60 characters.

Package is pre-v1 release.

While there is nothing inherently wrong with versions of 0.*.*, it usually means that the author is still experimenting with the general direction of the API.

Maintain an example.

None of the files in your example/ directory matches a known example patterns. Common file name patterns include: main.dart, example.dart or you could also use box2d_flame.dart.


Package Constraint Resolved Available
Direct dependencies
vector_math >=2.0.0 <3.0.0 2.0.8
Dev dependencies
browser >=0.10.0 <0.11.0