drawgl

package module
v0.0.0-...-ed1255c Latest Latest
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 Go to latest Published: Apr 21, 2016 License: MIT Imports: 10 Imported by: 0

README

drawgl

Drawing with graphs

Documentation

Index

Constants

View Source 
const (
	RGB Channel = iota
	Red         = 1 << iota
	Green
	Blue
	Alpha
)

Variables

View Source 
var (
	ErrOutOfBounds = errors.New("out of bounds")
)
View Source 
var (
	FloatColorModel color.Model = color.ModelFunc(floatColorModel)
)

Functions

func MaskFactor 

func MaskFactor(pt image.Point, mask Mask) (factor float32)

func ParseLength 

func ParseLength(dimen string) (px int, percent float64, err error)

ParseLength parses a string containing a number an an optional unit of length. The supported units are '%' for a percentage, 'px' or none for a pixel. It returns both pixel and percentage, as well as any possible error that might have occured during parsing.

func TranslateCoords 

func TranslateCoords(x, y int, b image.Rectangle, h EdgeHandler) (mx, my int)

Types

type Channel 

type Channel int

func (Channel) Is 

func (c Channel) Is(o Channel) bool

Is checks whether the channel contains a given value

func (Channel) MarshalJSON 

func (c Channel) MarshalJSON() (b []byte, err error)

func (Channel) Normalize 

func (c Channel) Normalize(includeAlpha ...bool) Channel

Normalize returns a normalized version a channel value. If the value is the composite RGB value, it is transformed to Red | Green | Blue. If includeAlpha is given and true, the alpha is also added to the channel

func (*Channel) UnmarshalJSON 

func (c *Channel) UnmarshalJSON(b []byte) (err error)

type ColorValue 

type ColorValue float32

func (ColorValue) Clamped 

func (v ColorValue) Clamped() ColorValue

Clamped returns a clamped color value, with a range 0-1

type EdgeHandler 

type EdgeHandler int
const (
	Extend EdgeHandler = iota
	Wrap
)

type FloatColor 

type FloatColor struct {
	R, G, B, A ColorValue
}

func MaskColor 

func MaskColor(dst FloatColor, src FloatColor, c Channel, f float32, op draw.Op) FloatColor

func (FloatColor) ApproxEqual 

func (c FloatColor) ApproxEqual(o FloatColor) bool

ApproxEqual is used by tests to check whether a color is approximately equal to another

func (FloatColor) RGBA 

func (c FloatColor) RGBA() (uint32, uint32, uint32, uint32)

type FloatImage 

type FloatImage struct {
	// Pix holds the image's pixels, in R, G, B, A order and big-endian format. The pixel at
	// (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*4].
	Pix []ColorValue
	// Stride is the Pix stride (in bytes) between vertically adjacent pixels.
	Stride int
	// Rect is the image's bounds.
	Rect image.Rectangle
}

func ConvertImage 

func ConvertImage(img image.Image) *FloatImage

func CopyImage 

func CopyImage(img *FloatImage) *FloatImage

func NewFloatImage 

func NewFloatImage(r image.Rectangle) *FloatImage

NewFloatImage returns a new FloatImage with the given bounds.

func (*FloatImage) At 

func (p *FloatImage) At(x, y int) color.Color

func (*FloatImage) Bounds 

func (p *FloatImage) Bounds() image.Rectangle

func (*FloatImage) ColorModel 

func (p *FloatImage) ColorModel() color.Model

func (*FloatImage) FloatAt 

func (p *FloatImage) FloatAt(x, y int) FloatColor

func (*FloatImage) Opaque 

func (p *FloatImage) Opaque() bool

Opaque scans the entire image and reports whether it is fully opaque.

func (*FloatImage) PixOffset 

func (p *FloatImage) PixOffset(x, y int) int

PixOffset returns the index of the first element of Pix that corresponds to the pixel at (x, y).

func (*FloatImage) Set 

func (p *FloatImage) Set(x, y int, c color.Color)

func (*FloatImage) SetColor 

func (p *FloatImage) SetColor(x, y int, c FloatColor)

func (*FloatImage) SubImage 

func (p *FloatImage) SubImage(r image.Rectangle) image.Image

SubImage returns an image representing the portion of the image p visible through r. The returned value shares pixels with the original image.

func (*FloatImage) UnsafeFloatAt 

func (p *FloatImage) UnsafeFloatAt(x, y int) FloatColor

func (*FloatImage) UnsafeSetColor 

func (p *FloatImage) UnsafeSetColor(x, y int, c FloatColor)

type Graph 

type Graph struct {
}

func (Graph) Process 

func (g Graph) Process(start graph.Linker) error

type LinearRectangleIterator 

type LinearRectangleIterator image.Rectangle

func (LinearRectangleIterator) Iterate 

func (rect LinearRectangleIterator) Iterate(mask Mask, fn func(pt image.Point, factor float32))

func (LinearRectangleIterator) VerticalIterate 

func (rect LinearRectangleIterator) VerticalIterate(mask Mask, fn func(pt image.Point, factor float32))

type Mask 

type Mask struct {
	Image image.Image
	Rect  image.Rectangle
	// contains filtered or unexported fields
}

func NewMask 

func NewMask(image image.Image, rect image.Rectangle) Mask

type Meta 

type Meta map[string]interface{}

type ParallelRectangleIterator 

type ParallelRectangleIterator image.Rectangle

func (ParallelRectangleIterator) Iterate 

func (rect ParallelRectangleIterator) Iterate(mask Mask, fn func(pt image.Point, factor float32))

func (ParallelRectangleIterator) VerticalIterate 

func (rect ParallelRectangleIterator) VerticalIterate(mask Mask, fn func(pt image.Point, factor float32))

type Processor 

type Processor interface {
	Process(wd graph.WalkData, buffers map[graph.ConnectorName]Result, output chan<- Result)
}

type RectangleIterator 

type RectangleIterator interface {
	// Iterate iterates over the image buffer, calling the fn function for each
	// point. The cycle order is row -> column. Implementations must ensure
	// that all columns of a given row are received in a single goroutine
	Iterate(mask Mask, fn func(pt image.Point, factor float32))
	// VerticalIterate iterates over the image buffer, calling the fn function
	// for each point. The cycle order is column -> row. Implementations must
	// ensure that all rows of a given column are received in a single
	// goroutine
	VerticalIterate(mask Mask, fn func(pt image.Point, factor float32))
}

func DefaultRectangleIterator 

func DefaultRectangleIterator(rect image.Rectangle, forceLinear ...bool) RectangleIterator

type Result 

type Result struct {
	Id           graph.Id
	Buffer       *FloatImage
	NamedBuffers map[graph.ConnectorName]*FloatImage
	Meta         Meta
	Error        error
}

Source Files

View all Source files

Directories

Path Synopsis
examples
convert
drawgl-json
edge-detect
convolution
io
tests
transform
transform/matrix

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