rasterizer

Documentation

Index

• func Draw(c *canvas.Canvas, resolution canvas.Resolution, colorSpace canvas.ColorSpace) *image.RGBA
• type GradientImage
  • func NewGradientImage(g canvas.Gradient, zp, size image.Point, res canvas.Resolution) *GradientImage
  • func (img *GradientImage) At(x, y int) color.Color
  • func (img *GradientImage) Bounds() image.Rectangle
  • func (img *GradientImage) ColorModel() color.Model
• type Rasterizer
  • func FromImage(img draw.Image, resolution canvas.Resolution, colorSpace canvas.ColorSpace) *Rasterizer
  • func New(width, height float64, resolution canvas.Resolution, ...) *Rasterizer
  • func (r *Rasterizer) Close()
  • func (r *Rasterizer) RenderImage(img image.Image, m canvas.Matrix)
  • func (r *Rasterizer) RenderPath(path *canvas.Path, style canvas.Style, m canvas.Matrix)
  • func (r *Rasterizer) RenderText(text *canvas.Text, m canvas.Matrix)
  • func (r *Rasterizer) Size() (float64, float64)

Functions

func Draw

func Draw(c *canvas.Canvas, resolution canvas.Resolution, colorSpace canvas.ColorSpace) *image.RGBA

Draw draws the canvas on a new image with given resolution (in dots-per-millimeter). Higher resolution will result in larger images.

Types

type GradientImage

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

func NewGradientImage

func NewGradientImage(g canvas.Gradient, zp, size image.Point, res canvas.Resolution) *GradientImage

func (*GradientImage) At

func (img *GradientImage) At(x, y int) color.Color

func (*GradientImage) Bounds

func (img *GradientImage) Bounds() image.Rectangle

func (*GradientImage) ColorModel

func (img *GradientImage) ColorModel() color.Model

type Rasterizer

type Rasterizer struct {
	draw.Image
	// contains filtered or unexported fields
}

Rasterizer is a rasterizing renderer.

func FromImage

func FromImage(img draw.Image, resolution canvas.Resolution, colorSpace canvas.ColorSpace) *Rasterizer

FromImage returns a renderer that draws to an existing image. Resolution is in pixels per unit of canvas coordinates (millimeters). A higher resolution will give a larger and more detailed image.

func New

func New(width, height float64, resolution canvas.Resolution, colorSpace canvas.ColorSpace) *Rasterizer

New returns a renderer that draws to a rasterized image. The final width and height of the image is the width and height (mm) multiplied by the resolution (px/mm), thus a higher resolution results in larger images. By default the linear color space is used, which assumes input and output colors are in linearRGB. If the sRGB color space is used for drawing with an average of gamma=2.2, the input and output colors are assumed to be in sRGB (a common assumption) and blending happens in linearRGB. Be aware that for text this results in thin stems for black-on-white (but wide stems for white-on-black).

func (*Rasterizer) Close

func (r *Rasterizer) Close()

func (*Rasterizer) RenderImage

func (r *Rasterizer) RenderImage(img image.Image, m canvas.Matrix)

RenderImage renders an image to the canvas using a transformation matrix.

func (*Rasterizer) RenderPath

func (r *Rasterizer) RenderPath(path *canvas.Path, style canvas.Style, m canvas.Matrix)

RenderPath renders a path to the canvas using a style and a transformation matrix.

func (*Rasterizer) RenderText

func (r *Rasterizer) RenderText(text *canvas.Text, m canvas.Matrix)

RenderText renders a text object to the canvas using a transformation matrix.

func (*Rasterizer) Size

func (r *Rasterizer) Size() (float64, float64)

Size returns the size of the canvas in millimeters.