geometry2d

Documentation

Index

• func RotateAtCenter(renderPos *ebiten.GeoM, rotation float64, width, height float64)
• type Vector2D
  • func (v1 Vector2D) Add(v2 Vector2D) Vector2D
  • func (v1 Vector2D) GetDirVector(v2 Vector2D) Vector2D
  • func (v1 Vector2D) GetUnitVector() Vector2D
  • func (v1 Vector2D) GetVectorLength() float64
  • func (v1 Vector2D) Sub(v2 Vector2D) Vector2D

Functions

func RotateAtCenter

func RotateAtCenter(renderPos *ebiten.GeoM, rotation float64, width, height float64)

RotateAtCenter totates a matrix on its center

Parameters:

• `renderPos`: matrix to rotate
• `rotation`: rotation in radians
• `width`: width of the sprite
• `height`: height of the sprite
• `position`: position of the sprite

Types

type Vector2D

type Vector2D struct {
	X, Y float64
}

Vector2D represents a simple 2D vector

func (Vector2D) Add

func (v1 Vector2D) Add(v2 Vector2D) Vector2D

Add adds two vectors and return the result as a new vector

func (Vector2D) GetDirVector

func (v1 Vector2D) GetDirVector(v2 Vector2D) Vector2D

GetDirVector gets the directional vector of two vectors

func (Vector2D) GetUnitVector

func (v1 Vector2D) GetUnitVector() Vector2D

GetUnitVector calculates the unit vector

func (Vector2D) GetVectorLength

func (v1 Vector2D) GetVectorLength() float64

GetVectorLength calculates the length of a given vector

func (Vector2D) Sub

func (v1 Vector2D) Sub(v2 Vector2D) Vector2D

Sub subtracts two vectors and return a new Vector2D