Physics2D

A 2D physics project

Classes

• Visualizer
• Vector2D
• PhysObj
• Collision
• Figure2D
  • Circle
  • Polygon

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Visualizer

Methods

• onDraw()

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Vector2D

Fields

• double x, y
  • represents vector coordinates.
• double length
  • represents length of the vector.
• double sqrLength
  • represents squared length of the vector.

Constructors

• Vector2D(double x, double y)
  • returns vector with coordinates given in arguments.

Static Methods

• intersection(Vector2D a, Vector2D b, Vector2D c, Vector2D d)
  • returns new vector represents point intersection of two lines specified with points a, b and c, d.
  • if there is no intersection returns null.
• sum(Vector2D[] vArr)
  • returns new vector equal to the sum of all vectors in parameters.
• length(double x, double y)
  • returns length of vector.
• sqrLength(double x, double y)
  • returns squared length of vector.
  • works faster than length().

Concrete Methods

• add(Vector2D v)
  • returns a new vector equal to the sum of this vector and vector given in the argument.
• sub(Vector2D v)
  • returns a new vector equal to the difference of this vector and vector given in the argument.
• scale(double mult)
• reverse()
  • returns reversed vector.
• rotate(double angle)
• rotate(double sinA, double cosA)
• zero()
  • returns zero vector.
• normalize()
  • returns a new vector equal to this but normalized vector.
• scalar(Vector2D v)
  • returns value equal to scalar product of this vector and vector given in the argument.
• angleBetween(Vector2D v)
  • returns value equal to angle between this vector and vector given in the argument in radians.
• setLength(double len)
• clone()
  • returns copy of this vector.
• toString()
  • format: (x, y).

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PhysObj

Fields

• Figure2D body

Concrete Methods

• draw(Canvas canvas, Paint paint)
• rotate(double angle)

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Collision

Modifiers

• package-private
• abstract

Static Methods

• getCollision(Circle a, Circle b)
• getCollision(Polygon a, Polygon b)
• getCollision(Circle a, Polygon b)

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Figure2D

Modifiers

• public
• abstract
• extends Collision

Abstract Methods

• getCollision(Figure2D f)
• getCollision(Circle c)
• getCollision(Polygon p)
• draw(Canvas canvas, Paint paint)
• rotate(double angle, Vector2D point)

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Circle

Modifiers

• public
• extends Figure2D

Fields

• Vector2D center
• double radius

Constructors

• Circle(Vector2D center, double radius)

Concrete Methods

• getCollision(Figure2D f)
• getCollision(Circle c)
• getCollision(Polygon p)
• draw(Canvas canvas, Paint paint)
• rotate(double angle, Vector2D point)

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Polygon

Modifiers

• public
• extends Figure2D

Concrete Methods

• getCollision(Figure2D f)
• getCollision(Circle c)
• getCollision(Polygon p)
• draw(Canvas canvas, Paint paint)
• rotate(double angle, Vector2D point)

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