d2

package
v0.0.0-...-1c91121 Latest Latest
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 Go to latest Published: Feb 13, 2023 License: MIT Imports: 3 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func AbsElem 

func AbsElem(a r2.Vec) r2.Vec

func CeilElem 

func CeilElem(a r2.Vec) r2.Vec

func Clamp 

func Clamp(x, a, b r2.Vec) r2.Vec

func CosElem 

func CosElem(a r2.Vec) r2.Vec

func DivElem 

func DivElem(a, b r2.Vec) r2.Vec

func Elem 

func Elem(sides float64) r2.Vec

func EqualWithin 

func EqualWithin(a, b r2.Vec, tol float64) bool

func LTEZero 

func LTEZero(a r2.Vec) bool

LTEZero returns true if any vector components are <= 0.

func LTZero 

func LTZero(a r2.Vec) bool

LTZero returns true if any vector components are < 0.

func Max 

func Max(a r2.Vec) float64

func MaxElem 

func MaxElem(a, b r2.Vec) r2.Vec

MaxElem return a vector with the maximum components of two vectors.

func Min 

func Min(a r2.Vec) float64

func MinElem 

func MinElem(a, b r2.Vec) r2.Vec

MinElem return a vector with the minimum components of two vectors.

func MulElem 

func MulElem(a, b r2.Vec) r2.Vec

func Overlap 

func Overlap(a, b r2.Vec) bool

Overlap returns true if 1D line segments a and b overlap.

func PolarToXY 

func PolarToXY(r, theta float64) r2.Vec

PolarToXY converts polar to cartesian coordinates. (TODO remove)

func SinElem 

func SinElem(a r2.Vec) r2.Vec

Types

type Box 

type Box r2.Box

Box is a 2d bounding box.

func NewBox2 

func NewBox2(center, size r2.Vec) Box

NewBox2 creates a 2d box with a given center and size.

func (Box) BottomLeft 

func (a Box) BottomLeft() r2.Vec

BottomLeft returns the bottom left corner of a 2d bounding box.

func (Box) Center 

func (a Box) Center() r2.Vec

Center returns the center of a 2d box.

func (Box) Contains 

func (a Box) Contains(v r2.Vec) bool

Contains checks if the 2d box contains the given vector (considering bounds as inside).

func (Box) Enlarge 

func (a Box) Enlarge(v r2.Vec) Box

Enlarge returns a new 2d box enlarged by a size vector.

func (Box) Equals 

func (a Box) Equals(b Box, tol float64) bool

Equals test the equality of 2d boxes.

func (Box) Extend 

func (a Box) Extend(b Box) Box

Extend returns a box enclosing two 2d boxes.

func (Box) Include 

func (a Box) Include(v r2.Vec) Box

Include enlarges a 2d box to include a point.

func (Box) MinMaxDist2 

func (a Box) MinMaxDist2(p r2.Vec) r2.Vec

MinMaxDist2 returns the minimum and maximum dist * dist from a point to a box. Points within the box have minimum distance = 0.

func (*Box) Random 

func (b *Box) Random() r2.Vec

Random returns a random point within a bounding box.

func (*Box) RandomSet 

func (b *Box) RandomSet(n int) Set

RandomSet returns a set of random points from within a bounding box.

func (Box) ScaleAboutCenter 

func (a Box) ScaleAboutCenter(k float64) Box

ScaleAboutCenter returns a new 2d box scaled about the center of a box.

func (Box) Size 

func (a Box) Size() r2.Vec

Size returns the size of a 2d box.

func (Box) TopLeft 

func (a Box) TopLeft() r2.Vec

TopLeft returns the top left corner of a 2d bounding box.

func (Box) Translate 

func (a Box) Translate(v r2.Vec) Box

Translate translates a 2d box.

func (Box) Vertices 

func (a Box) Vertices() Set

Vertices returns a slice of 2d box corner vertices.

type Pol 

type Pol struct {
	R, Theta float64
}

func CartesianToPolar 

func CartesianToPolar(a r2.Vec) Pol

CartesianToPolar converts a cartesian to a polar coordinate.

func (Pol) PolarToCartesian 

func (a Pol) PolarToCartesian() r2.Vec

PolarToCartesian converts a polar to a cartesian coordinate.

type Set 

type Set []r2.Vec

func (Set) Max 

func (a Set) Max() r2.Vec

Max return the maximum components of a set of vectors.

func (Set) Min 

func (a Set) Min() r2.Vec

Min return the minimum components of a set of vectors.

type SortByX 

type SortByX Set

func (SortByX) Len 

func (a SortByX) Len() int

func (SortByX) Less 

func (a SortByX) Less(i, j int) bool

func (SortByX) Swap 

func (a SortByX) Swap(i, j int)

type Transform 

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

Transform represents a 2D spatial transformation including translation and rotation.

func NewTransform 

func NewTransform(data []float64) Transform

func TransformIdentity 

func TransformIdentity() Transform

func (Transform) Add 

func (a Transform) Add(b Transform) Transform

func (Transform) ApplyBox 

func (a Transform) ApplyBox(box Box) Box

ApplyBox rotates/translates a 2d bounding box and resizes for axis-alignment.

func (Transform) ApplyPos 

func (t Transform) ApplyPos(b r2.Vec) r2.Vec

func (*Transform) At 

func (t *Transform) At(i, j int) float64

func (Transform) Determinant 

func (a Transform) Determinant() float64

Determinant returns the determinant of a 4x4 matrix.

func (Transform) Inverse 

func (a Transform) Inverse() Transform

Inverse returns the inverse of a 3x3 matrix.

func (Transform) Mul 

func (a Transform) Mul(b Transform) Transform

Mul multiplies 3x3 matrices.

func (Transform) Scale 

func (t Transform) Scale(k float64) Transform

func (*Transform) Set 

func (t *Transform) Set(i, j int, v float64)

Source Files

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