draw

package

v3.9.3+incompatible Latest Latest Go to latest Published: Sep 30, 2016 License: CC-BY-3.0, Freetype, GPL-3.0-or-later Imports: 18 Imported by: 60

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2D rendering of data slices.

View Source

const (
	X = 0
	Y = 1
	Z = 2
)

This section is empty.

func ColorMap(min, max, value float32, colormap ...color.RGBA) color.RGBA

func GIF256(w io.Writer, img image.Image) error

full quality gif coded, passable to Render()

func HSLMap(x, y, z float32) color.RGBA

Colormap for 3D vector data.

func HSLtoRGB(h, s, l float32) color.RGBA

h = 0..2pi, s=0..1, l=0..1

func Image(f *data.Slice, fmin, fmax string, arrowSize int, colormap ...color.RGBA) *image.RGBA

Renders an image of slice. fmin, fmax = "auto" or a number to set the min/max color scale.

func JPEG100(w io.Writer, img image.Image) error

full-quality jpeg codec, passable to Render()

func On(img *image.RGBA, f *data.Slice, fmin, fmax string, arrowSize int, colormap ...color.RGBA)

Render on existing image buffer. Resize it if needed

func PNG(w io.Writer, img image.Image) error

png codec, passable to Render()

func Render(out io.Writer, f *data.Slice, min, max string, arrowSize int, encode codec, colormap ...color.RGBA) error

Render data and encode with arbitrary codec.

func RenderFile(fname string, f *data.Slice, min, max string, arrowSize int, colormap ...color.RGBA) error

func RenderFormat(out io.Writer, f *data.Slice, min, max string, arrowSize int, format string, colormap ...color.RGBA) error

func SVG(out io.Writer, arr [3][][][]float32)

Renders svg image of vector data.

type Canvas struct {
	*image.RGBA
	*raster.RGBAPainter
	// contains filtered or unexported fields
}

A Canvas is used to draw on.

func NewCanvas(img *image.RGBA) *Canvas

Make a new canvas of size w x h.

func (c *Canvas) Arrow(x, y, mx, my, mz, size float32)