vector_math 2.0.8
vector_math #
Introduction #
A Vector math library for 2D and 3D applications.
Features #
 2D, 3D, and 4D vector and matrix types.
 Quaternion type for animating rotations.
 Collision detection: AABB, rays, spheres, ...
 Utilities like color and common rendering related operations
 Flexible getters and setters, for example,
position.xwz = color.grb;
.  Fully documented.
 Well tested.
 Heavily optimized.
Libraries using vector_math #
Getting Started #
1. Add the following to your project's pubspec.yaml and run pub get
.
dependencies:
vector_math: any
2. Add the correct import for your project.
import 'package:vector_math/vector_math.dart';
Documentation #
Read the docs
Examples #
1. Using the GLSL getter and setter syntax.
import 'package:vector_math/vector_math.dart';
void main() {
Vector3 x = new Vector3.zero(); // Zero vector
Vector4 y = new Vector4.all(4.0); // Vector with 4.0 in all lanes
x.zyx = y.xzz; // Sets z,y,x the values in x,z,z
}
2. Transforming a vector.
import 'dart:math';
import 'package:vector_math/vector_math.dart';
void main() {
// Rotation of PI/2 degrees around the Y axis followed by a
// translation of (5.0, 2.0, 3.0).
Matrix4 T = new Matrix4.rotationY(PI * 0.5)..translate(5.0, 2.0, 3.0);
// A point.
Vector3 position = new Vector3(1.0, 1.0, 1.0);
// Transform position by T.
T.transform3(position);
}
3. Invert a matrix
import 'dart:math';
import 'package:vector_math/vector_math.dart';
void main() {
// Rotation of 90 degrees around the Y axis followed by a
// translation of (5.0, 2.0, 3.0).
Matrix4 T = new Matrix4.rotationY(PI * 0.5)..translate(5.0, 2.0, 3.0);
// Invert T.
T.invert();
// Invert just the rotation in T.
T.invertRotation();
}
4. Rotate a vector using a quaternion
import 'dart:math';
import 'package:vector_math/vector_math.dart';
void main() {
// The X axis.
Vector3 axis = new Vector3(1.0, 0.0, 0.0);
// 90 degrees.
double angle = PI / 2.0;
// Quaternion encoding a 90 degree rotation along the X axis.
Quaternion q = new Quaternion.axisAngle(axis, angle);
// A point.
Vector3 point = new Vector3(1.0, 1.0, 1.0);
// Rotate point by q.
q.rotate(point);
}
5. Check if two axis aligned bounding boxes intersect
import 'package:vector_math/vector_math.dart';
void main() {
// Define the first box with a minimum and a maximum.
Aabb2 aabbOne = new Aabb2.minMax(new Vector2.zero(), new Vector2(4.0, 4.0));
// Define the second box
Aabb2 aabbTwo =
new Aabb2.minMax(new Vector2(5.0, 5.0), new Vector2(6.0, 6.0));
// Extend the second box to contain a point
aabbTwo.hullPoint(new Vector2(3.0, 3.0));
// Check if the two boxes intersect, returns true in this case.
bool intersect = aabbOne.intersectsWithAabb2(aabbTwo);
}
6. Check where a ray and a sphere intersect
import 'package:vector_math/vector_math.dart';
void main() {
// Define a ray starting at the origin and going into positive xdirection.
Ray ray = new Ray.originDirection(new Vector3.zero(), new Vector3(1.0, 0.0, 0.0));
// Defines a sphere with the center (5.0 0.0 0.0) and a radius of 2.
Sphere sphere = new Sphere.centerRadius(new Vector3(5.0, 0.0, 0.0), 2.0);
// Checks if the ray intersect with the sphere and returns the distance of the
// intersection from the origin of the ray. Would return null if no intersection
// is found.
double distanceFromOrigin = ray.intersectsWithSphere(sphere);
// Evaluate the position of the intersection, in this case (3.0 0.0 0.0).
Vector3 position = ray.at(distanceFromOrigin);
}
7. Work with colors
import 'package:vector_math/vector_math.dart';
void main() {
// Access a buildin color, colors are stored in 4dimensional vectors.
Vector4 red = Colors.red;
Vector4 gray = new Vector4.zero();
// Convert the red color to a grayscaled color.
Colors.toGrayscale(red, gray);
// Parse a blue color from a hex string.
Vector4 blue = new Vector4.zero();
Colors.fromHexString('#0000FF', blue);
// Convert the blue color from RGB to HSL.
Colors.rgbToHsl(blue, blue);
// Reduce the lightness of the color by 50%.
blue.z *= 0.5;
// Convert the HSL color back to RGB.
Colors.hslToRgb(blue, blue);
}
Development #
To run test cases:
~/src/vector_math/> pub run test:test
To automatically generate the latest version of vector_math_64
:
~/src/vector_math/> dart tool/generate_vector_math_64.dart
Changelog  vector_math #
v 2.0.8  July 2018 #
 Internal fix to use Dart 2 core library constant names.
v 2.0.7  April 2018 #
 Fixed indexing bug in MeshGeometry.combine
v 2.0.6  March 2018 #
 Fixed angleTo for vectors that do not have unit length
 Added Matrix4.tryInvert.
v 2.0.5  July 2017 #
 Strong mode clean
v 2.0.4  February 2017 #
 Added Matrix4.isIdentity()
 Added Matrix4.isZero()
 Added Matrix3.isIdentity()
 Added Matrix3.isZero()
 Added Vector2.angleTo and Vector2.angleToSigned
v 2.0.3  May 2016 #
 Synchronize Float64 version
v 2.0.2  May 2016 #
 Add Matrix4.leftTranslate
v 2.0.1  April 2016 #
 Add Matrix4.SkewX, Matrix4.SkewY, and Matrix4.Skew constructors
v 2.0.0  March 2016 #
 Remove call chaining, methods don't return this anymore. You can use the method cascade operator instead.
 Remove dependency on quiver package
v 1.4.7  February 2016 #
 Fixed ArgumentError usage in Matrix4.inverted constructor
v 1.4.6  January 2016 #
 Added MatrixX.fromList constructor
v 1.4.5  January 2016 #
 Added Matrix4.inverted constructor
v 1.4.4  December 2014 #
 Updated dependencies.
 Moved benchmark code into
benchmark/
 Updated
vector_math_64
.
v 1.4.3  February 2014 #
 Add color conversion routines (Contributed by Oliver Sand)
 More collision and geometry routines (Contributed by Oliver Sand)
 More tests (Contributed by Oliver Sand)
 v 1.4.3 pub release
v 1.4.1  January 2014 #
 Better mesh generators (contributed by Brandon Jones)
 Fix bug in ray v. triangle intersection test (contributed by @AMagill)
v 1.4.0  November 2013 #
 Add basic mesh generators (contributed by Brandon Jones)
 Add more collision detection objects (contributed by Oliver Sand)
v 1.3.5  July 2013 #
 Class names now start with upper case, following Dart style guide.
 Performance audit.
 New vector_math_operations library.
 New vector_math_lists library.
 Added Aabb2 and fleshed out Aabb3 (thanks to Laszlo Korte)
 Added Matrix solve methods (thanks to Laszlo Korte)
 Added Methods needed for Three.dart (thanks to Anders Forsell)
v 1.1.0  April 2013 #
 Large refactoring.
v 0.9.7  March 2013 #
 Refactor generated constructor code into small functions.
 Refactor generated operator* code into small functions.
 Fix typo in quaternion code.
v 0.9.6  March 2013 #
 Update to latest String library.
 Fix holding references in matrix constructor.
 Replace double type with num in rotationY, and rotationZ.
v 0.9.5  February 2013 #
 Remove remaining double type tests and replace them with num.
 Don't throw in the default matrix and vector constructors.
v 0.9.4  February 2013 #
 Remove unnecessary dart:scalarlist import.
 Now that dart2js is fixed, rename negate_ back to negate.
 Fix library imports in test suites.
 Flexible constructor fix added to the generator.
 Tested library under dart2js
v 0.9.3  February 2013 #
 Revert to using a single library!
 Public API reverted to taking nums instead of doubles.
 Fixed all warnings/errors introduced by M3.
 drone.io integrated tests.
 Fixed bug in rotation construction.
 Fixed bug in orthographic matrix construction.
 External contribution by fkleon fixing flexible constructors.
 External contribution by donnydont adding a missing cast .toDouble().
v 0.9.0  October 2012 #
 Pub: Dart Vector Math now fully supports the pub package management system!
 API++: Minor changes to the API everywhere. The changes improve the aesthetics and performance of the library.
 Faster: Lots of performance tweaks resulting in the library getting faster and generating less garbage.
 2D Cross Product: The Box2D Dart port requires a 2D cross product.
 Library Split: Two libraries, one for browser applications and console applications.
v 0.8.5  July 29 2012 #
 33% faster matrix matrix multiply
 Fix generated operator[]=
 Fix OpenGL lookat and perspective matrix constructors
 Fix mat4x4 rotation constructors
 Fix mat4x4 multiplied with vector3 not applying translation
 Add utility methods for moving between Dart Vector Math types and Float32Array/Float32List types
 Add mat4x4 translation constructor
 Fixed buildPlaneVectors method
 Fix mat4x4 transformDirect3 not applying translation
 Add a new variant of mix() that takes the parameter t as a num or a vector
 Large code reorganization to make it fit the 'dartblanklib' template
v 0.8.0  June 10 2012 #
 Inverse of 2x2,3x3,4x4 matrices
 Inverse of upper 3x3 of a 4x4 matrix
 Added zero, copy and raw specialized (and branchless) vector constructors
 Added specialized copy matrix constructor
 Added specialized rotation matrix constructors for mat2x2, mat3x3, and mat4x4
 Added setRotation(num radians) to mat2x2
 Added setRotationAround[x,y,z](num radians) to mat3x3 and mat4x4
 Added buildPlaneVectors which constructs the spanning vectors given a plane normal
 Added Adjoint of 2x2,3x3, and 4x4 matrices
 Fixed many bugs in quaternion class
 Fixed adjoint matrix code generation
 Added selfAdd, selfSub, selfScale and selfNegate to matrix classes
 Added serialization support for Float32Array and Vectors/Matrices
v 0.0.0  March 20 2012 #
 Initial release
Use this package as a library
1. Depend on it
Add this to your package's pubspec.yaml file:
dependencies:
vector_math: ^2.0.8
2. Install it
You can install packages from the command line:
with pub:
$ pub get
with Flutter:
$ flutter pub get
Alternatively, your editor might support pub get
or flutter pub get
.
Check the docs for your editor to learn more.
3. Import it
Now in your Dart code, you can use:
import 'package:vector_math/vector_math.dart';
Popularity:
Describes how popular the package is relative to other packages.
[more]

99

Health:
Code health derived from static analysis.
[more]

70

Maintenance:
Reflects how tidy and uptodate the package is.
[more]

54

Overall:
Weighted score of the above.
[more]

81

We analyzed this package on Oct 21, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:
 Dart: 2.5.1
 pana: 0.12.21
Platforms
Detected platforms: Flutter, web, other
No platform restriction found in primary library
package:vector_math/vector_math.dart
.
Health suggestions
Fix lib/src/vector_math/third_party/noise.dart
. (11.33 points)
Analysis of lib/src/vector_math/third_party/noise.dart
reported 24 hints, including:
line 151 col 7: DO use curly braces for all flow control structures.
line 160 col 7: DO use curly braces for all flow control structures.
line 167 col 7: DO use curly braces for all flow control structures.
line 276 col 7: DO use curly braces for all flow control structures.
line 283 col 7: DO use curly braces for all flow control structures.
Fix lib/src/vector_math_64/third_party/noise.dart
. (11.33 points)
Analysis of lib/src/vector_math_64/third_party/noise.dart
reported 24 hints, including:
line 151 col 7: DO use curly braces for all flow control structures.
line 160 col 7: DO use curly braces for all flow control structures.
line 167 col 7: DO use curly braces for all flow control structures.
line 276 col 7: DO use curly braces for all flow control structures.
line 283 col 7: DO use curly braces for all flow control structures.
Fix lib/src/vector_math_geometry/generators/ring_generator.dart
. (1.99 points)
Analysis of lib/src/vector_math_geometry/generators/ring_generator.dart
reported 4 hints:
line 24 col 19: Use =
to separate a named parameter from its default value.
line 25 col 24: Use =
to separate a named parameter from its default value.
line 26 col 25: Use =
to separate a named parameter from its default value.
line 27 col 35: Use =
to separate a named parameter from its default value.
Fix additional 9 files with analysis or formatting issues. (8.97 points)
Additional issues in the following files:
lib/src/vector_math_geometry/generators/circle_generator.dart
(3 hints)lib/src/vector_math_geometry/generators/geometry_generator.dart
(3 hints)lib/src/vector_math_lists/vector_list.dart
(3 hints)lib/src/vector_math/colors.dart
(2 hints)lib/src/vector_math_64/colors.dart
(2 hints)lib/src/vector_math_geometry/generators/sphere_generator.dart
(2 hints)lib/src/vector_math/aabb3.dart
(1 hint)lib/src/vector_math_64/aabb3.dart
(1 hint)lib/src/vector_math_geometry/generators/cylinder_generator.dart
(1 hint)
Maintenance suggestions
Package is getting outdated. (24.66 points)
The package was last published 65 weeks ago.
The package description is too short. (11 points)
Add more detail to the description
field of pubspec.yaml
. Use 60 to 180 characters to describe the package, what it does, and its target use case.
Maintain an example. (10 points)
Create a short demo in the example/
directory to show how to use this package.
Common filename patterns include main.dart
, example.dart
, and vector_math.dart
. Packages with multiple examples should provide example/README.md
.
For more information see the pub package layout conventions.
Dependencies
Package  Constraint  Resolved  Available 

Direct dependencies  
Dart SDK  >=2.0.0dev.49.0 <3.0.0  
Dev dependencies  
benchmark_harness  any  
browser  any  
path  >=1.0.0 <2.0.0  
test  >=0.12.0 <0.13.0 