mathg

func (*Line) Angle ¶

func (l *Line) Angle() float64

func (*Line) Bounds ¶

func (l *Line) Bounds() Rectangle

func (*Line) Dx ¶

func (l *Line) Dx() float64

Dx returns l's width.

func (*Line) Dy ¶

func (l *Line) Dy() float64

Dy returns l's height.

func (*Line) Intersects ¶

func (l *Line) Intersects(m Line) bool

func (*Line) Length ¶

func (l *Line) Length() float64

func (Point) Add ¶

func (p Point) Add(q Point) Point

Add returns the vector p+q.

func (Point) Angle ¶

func (p Point) Angle() float64

func (Point) Cross ¶

func (p Point) Cross(q Point) float64

func (Point) Div ¶

func (p Point) Div(k float64) Point

Div returns the vector p/k.

func (Point) Dot ¶

func (p Point) Dot(q Point) float64

func (Point) Equal ¶

func (p Point) Equal(q Point) bool

Equal reports whether p and q are equal.

func (Point) In ¶

func (p Point) In(r Rectangle) bool

In reports whether p is in r.

func (Point) LengthSq ¶

func (p Point) LengthSq() float64

LengthSq returns |p|^2.

func (Point) Lerp ¶

func (p Point) Lerp(q Point, t float64) Point

func (Point) Mul ¶

func (p Point) Mul(k float64) Point

Mul returns the vector p*k.

func (Point) Normalized ¶

func (p Point) Normalized() Point

Normalized returns the normalized vector.

func (Point) Rotate ¶

func (p Point) Rotate(theta float64) Point

func (Point) String ¶

func (p Point) String() string

func (Point) Sub ¶

func (p Point) Sub(q Point) Point

Sub returns the vector p-q.

func (Rectangle) Add ¶

func (r Rectangle) Add(p Point) Rectangle

Add returns the rectangle r translated by p.

func (Rectangle) At ¶

func (r Rectangle) At(x, y int) color.Color

At implements the Image interface.

func (Rectangle) Bounds ¶

func (r Rectangle) Bounds() image.Rectangle

Bounds implements the Image interface.

func (Rectangle) Canon ¶

func (r Rectangle) Canon() Rectangle

Canon returns the canonical version of r. The returned rectangle has minimum and maximum coordinates swapped if necessary so that it is well-formed.

func (Rectangle) ColorModel ¶

func (r Rectangle) ColorModel() color.Model

ColorModel implements the Image interface.

func (Rectangle) Dx ¶

func (r Rectangle) Dx() float64

Dx returns r's width.

func (Rectangle) Dy ¶

func (r Rectangle) Dy() float64

Dy returns r's height.

func (Rectangle) Empty ¶

func (r Rectangle) Empty() bool

Empty reports whether the rectangle contains no points.

func (Rectangle) Eq ¶

func (r Rectangle) Eq(s Rectangle) bool

Eq reports whether r and s contain the same set of points. All empty rectangles are considered equal.

func (Rectangle) Image ¶

func (r Rectangle) Image() image.Rectangle

func (Rectangle) In ¶

func (r Rectangle) In(s Rectangle) bool

In reports whether every point in r is in s.

func (Rectangle) Inset ¶

func (r Rectangle) Inset(n float64) Rectangle

Inset returns the rectangle r inset by n, which may be negative. If either of r's dimensions is less than 2*n then an empty rectangle near the center of r will be returned.

func (Rectangle) Intersect ¶

func (r Rectangle) Intersect(s Rectangle) Rectangle

Intersect returns the largest rectangle contained by both r and s. If the two rectangles do not overlap then the zero rectangle will be returned.

func (Rectangle) Overlaps ¶

func (r Rectangle) Overlaps(s Rectangle) bool

Overlaps reports whether r and s have a non-empty intersection.

func (Rectangle) Size ¶

func (r Rectangle) Size() Point

Size returns r's width and height.

func (Rectangle) String ¶

func (r Rectangle) String() string

String returns a string representation of r like "(3,4)-(6,5)".

func (Rectangle) Sub ¶

func (r Rectangle) Sub(p Point) Rectangle

Sub returns the rectangle r translated by -p.

func (Rectangle) Union ¶

func (r Rectangle) Union(s Rectangle) Rectangle

Union returns the smallest rectangle that contains both r and s.