affine

Documentation

Overview

Package to handle 2D affine transformations, following GDAL affine convention

Index

• type Affine
  • func NewAffine(a, b, c, d, e, f float64) *Affine
  • func Scale(scalex, scaley float64) *Affine
  • func Translation(offx, offy float64) *Affine
  • func (a *Affine) Inverse() *Affine
  • func (a *Affine) IsInvertible() bool
  • func (a *Affine) Multiply(b *Affine) *Affine
  • func (a *Affine) Rx() float64
  • func (a *Affine) Ry() float64
  • func (a *Affine) Transform(x float64, y float64) (float64, float64)

Types

type Affine

type Affine [6]float64

Affine follows the GDAL transform convention

func NewAffine

func NewAffine(a, b, c, d, e, f float64) *Affine

func Scale

func Scale(scalex, scaley float64) *Affine

Scale creates a scale transform from (scalex, scaley)

func Translation

func Translation(offx, offy float64) *Affine

Translation creates a translation transform from (offx, offy)

func (*Affine) Inverse

func (a *Affine) Inverse() *Affine

Inverse creates the inverse of the affine transform. Inverse panics if it is not inversible

func (*Affine) IsInvertible

func (a *Affine) IsInvertible() bool

IsInvertible returns true if the transformation is invertible

func (*Affine) Multiply

func (a *Affine) Multiply(b *Affine) *Affine

Multiply merges the two affines transforms into one.

func (*Affine) Rx

func (a *Affine) Rx() float64

Rx returns the X resolution

func (*Affine) Ry

func (a *Affine) Ry() float64

Ry returns the Y resolution

func (*Affine) Transform

func (a *Affine) Transform(x float64, y float64) (float64, float64)

Transform applies the affine transform to the point (x, y)