affine2d

README

go-affine2d

Package affine2d implements 2D affine transformations.

License

MIT

Documentation

Overview

Package affine2d implements 2D affine transformations.

Index

• type Transform
  • func Delta(origin, unitX []float64) *Transform
  • func Identity() *Transform
  • func NewTransform(m [6]float64) *Transform
  • func Rotate(theta float64) *Transform
  • func Scale(sx, sy float64) *Transform
  • func Shear(sx, sy float64) *Transform
  • func Translate(tx, ty float64) *Transform
  • func (t *Transform) Float64Array() [6]float64
  • func (t *Transform) Float64Slice() []float64
  • func (t *Transform) Inverse() *Transform
  • func (t *Transform) Multiply(u *Transform) *Transform
  • func (t *Transform) Rotate(theta float64) *Transform
  • func (t *Transform) Scale(sx, sy float64) *Transform
  • func (t *Transform) Then(u *Transform) *Transform
  • func (t *Transform) Transform(p []float64) []float64
  • func (t *Transform) TransformDirection(v []float64) []float64
  • func (t *Transform) TransformInPlace(p []float64) []float64
  • func (t *Transform) TransformSlice(ps [][]float64) [][]float64
  • func (t *Transform) TransformSliceInPlace(ps [][]float64) [][]float64
  • func (t *Transform) TransformXY(x, y float64) (float64, float64)
  • func (t *Transform) Translate(tx, ty float64) *Transform

Types

type Transform

type Transform struct {
	// contains filtered or unexported fields
}

A Transform is a 2D affine transform.

func Delta

func Delta(origin, unitX []float64) *Transform

Delta returns the transform that transforms the origin to origin and the unit X vector to unitX.

func Identity

func Identity() *Transform

Identity returns a new identity transform.

func NewTransform

func NewTransform(m [6]float64) *Transform

NewTransform returns a new transform with the given coefficients.

func Rotate

func Rotate(theta float64) *Transform

Rotate returns a new rotate transform.

func Scale

func Scale(sx, sy float64) *Transform

Scale returns a new scale transform.

func Shear

func Shear(sx, sy float64) *Transform

Shear returns a new shear transform.

func Translate

func Translate(tx, ty float64) *Transform

Translate returns a new translate transform.

func (*Transform) Float64Array

func (t *Transform) Float64Array() [6]float64

Float64Array returns the coefficients of t's matrix in row order.

func (*Transform) Float64Slice

func (t *Transform) Float64Slice() []float64

Float64Slice returns the coefficients of t's matrix in row order. The returned slice must not be modified.

func (*Transform) Inverse

func (t *Transform) Inverse() *Transform

func (*Transform) Multiply

func (t *Transform) Multiply(u *Transform) *Transform

Multiply returns a new transform which is u then t.

func (*Transform) Rotate

func (t *Transform) Rotate(theta float64) *Transform

Rotate returns a new transform which is t then a rotation.

func (*Transform) Scale

func (t *Transform) Scale(sx, sy float64) *Transform

Scale returns a new transform which is t then a scale.

func (*Transform) Then

func (t *Transform) Then(u *Transform) *Transform

Then returns a transform that is t then u.

func (*Transform) Transform

func (t *Transform) Transform(p []float64) []float64

Transform transforms a single vector.

func (*Transform) TransformDirection

func (t *Transform) TransformDirection(v []float64) []float64

TransformDirection transforms the direction v.

func (*Transform) TransformInPlace

func (t *Transform) TransformInPlace(p []float64) []float64

TransformInPlace transforms a single vector in place.

func (*Transform) TransformSlice

func (t *Transform) TransformSlice(ps [][]float64) [][]float64

TransformSlice transforms a slice of vectors.

func (*Transform) TransformSliceInPlace

func (t *Transform) TransformSliceInPlace(ps [][]float64) [][]float64

TransformSliceInPlace transforms a slice of vectors in place.

func (*Transform) TransformXY

func (t *Transform) TransformXY(x, y float64) (float64, float64)

TransformXY transforms an X-Y coordinate.

func (*Transform) Translate

func (t *Transform) Translate(tx, ty float64) *Transform

Translate returns a new transform which is t then a translate.