sky

Documentation

Index

• func Blend(targetImage lincolor.Image, skyImage lincolor.Image, skySize Size)
• type Size
  • func FindSkyHeight(sourceImage image.Image, blendHeightFactor float64, expandFactor float64) Size
  • func NewSize(inputImageBounds image.Rectangle, skyHeight int, blendHeightFactor float64) Size
  • func (s *Size) DrawBounds(sourceImage draw.Image)
  • func (s *Size) IsEmpty() bool
  • func (s *Size) PureSkyBounds() image.Rectangle
  • func (s *Size) TotalBounds() image.Rectangle
  • func (s *Size) TotalHeight() int

Functions

func Blend

func Blend(targetImage lincolor.Image, skyImage lincolor.Image, skySize Size)

Blend merges the sky from the sky image into the target image.

Types

type Size

type Size struct {
	PureSkyHeight int
	BlendHeight   int
	// contains filtered or unexported fields
}

Size contains size information about the sky. All heights are expressed in pixels from the top row.

func FindSkyHeight

func FindSkyHeight(
	sourceImage image.Image,
	blendHeightFactor float64,
	expandFactor float64,
) Size

FindSkyHeight analyses the image to find the height of area with blank holes, and a suitable height for blending.

func NewSize

func NewSize(inputImageBounds image.Rectangle, skyHeight int, blendHeightFactor float64) Size

NewSize returns a Size with blend height factor accounted for.

func (*Size) DrawBounds

func (s *Size) DrawBounds(sourceImage draw.Image)

DrawBounds draws black lines to demark the pure sky and the blend area.

func (*Size) IsEmpty

func (s *Size) IsEmpty() bool

IsEmpty returns true iff the sky height is zero.

func (*Size) PureSkyBounds

func (s *Size) PureSkyBounds() image.Rectangle

PureSkyBounds returns the image rectangle covered by only the pure sky, no blend area.

func (*Size) TotalBounds

func (s *Size) TotalBounds() image.Rectangle

TotalBounds returns the image rectangle covered by the sky, including blend area.

func (*Size) TotalHeight

func (s *Size) TotalHeight() int

TotalHeight returns the total height of the sky (pure sky + blend area).