vgcairo

README

vgcairo

Cairo rendering backend for gonum/plot. Primarily meant to be used with gotk4's GTK3 and GTK4.

Documentation

Overview

Package vgcairo provides a Cairo drawing backend for gonum.org/plot/vg.

Index

• func ColorSurface(surface *cairo.Surface, x, y float64) color.Color
• type Canvas
  • func NewCanvas(t *cairo.Context) Canvas
  • func (c Canvas) Context() *cairo.Context
  • func (c Canvas) DrawImage(rect vg.Rectangle, img image.Image)
  • func (c Canvas) Fill(path vg.Path)
  • func (c Canvas) FillString(f font.Face, pt vg.Point, text string)
  • func (c Canvas) Pop()
  • func (c Canvas) Push()
  • func (c Canvas) Rotate(rad float64)
  • func (c Canvas) Scale(x, y float64)
  • func (c Canvas) SetColor(clr color.Color)
  • func (c Canvas) SetLineDash(pattern []vg.Length, offset vg.Length)
  • func (c Canvas) SetLineWidth(l vg.Length)
  • func (c Canvas) Stroke(path vg.Path)
  • func (c Canvas) Translate(pt vg.Point)

Functions

func ColorSurface

func ColorSurface(surface *cairo.Surface, x, y float64) color.Color

ColorSurface is a type that implements all of color.Color's methods and wraps around a cairo.Surface. This is useful for SetColor.

Note that calling RGBA on the returned color will always return a transparent color.

Types

type Canvas

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

Canvas implements the vg.Canvas interface, drawing to a cairo.Context.

func NewCanvas

func NewCanvas(t *cairo.Context) Canvas

NewCanvas returns a new Cairo Canvas.

func (Canvas) Context

func (c Canvas) Context() *cairo.Context

Context returns the Canvas' cairo.Context.

func (Canvas) DrawImage

func (c Canvas) DrawImage(rect vg.Rectangle, img image.Image)

DrawImage implements vg.Canvas.

func (Canvas) Fill

func (c Canvas) Fill(path vg.Path)

Fill implements vg.Canvas.

func (Canvas) FillString

func (c Canvas) FillString(f font.Face, pt vg.Point, text string)

FillString implements vg.Canvas.

func (Canvas) Pop

func (c Canvas) Pop()

Pop implements vg.Canvas.

func (Canvas) Push

func (c Canvas) Push()

Push implements vg.Canvas.

func (Canvas) Rotate

func (c Canvas) Rotate(rad float64)

Rotate implements vg.Canvas.

func (Canvas) Scale

func (c Canvas) Scale(x, y float64)

Scale implements vg.Canvas.

func (Canvas) SetColor

func (c Canvas) SetColor(clr color.Color)

SetColor implements vg.Canvas.

func (Canvas) SetLineDash

func (c Canvas) SetLineDash(pattern []vg.Length, offset vg.Length)

SetLineDash implements vg.Canvas.

func (Canvas) SetLineWidth

func (c Canvas) SetLineWidth(l vg.Length)

SetLineWidth implements vg.Canvas.

func (Canvas) Stroke

func (c Canvas) Stroke(path vg.Path)

Stroke implements vg.Canvas.

func (Canvas) Translate

func (c Canvas) Translate(pt vg.Point)

Translate implements vg.Canvas.