Beispiel #1
0
func New(w, h vg.Length) *Canvas {
	buf := new(bytes.Buffer)
	c := &Canvas{
		svg: svgo.New(buf),
		w:   w,
		h:   h,
		buf: buf,
		ht:  w.Points(),
		stk: []context{context{}},
	}

	// This is like svg.Start, except it uses floats
	// and specifies the units.
	fmt.Fprintf(buf, `<?xml version="1.0"?>
<!-- Generated by SVGo and Plotinum VG -->
<svg width="%.*gin" height="%.*gin"
	xmlns="http://www.w3.org/2000/svg" 
	xmlns:xlink="http://www.w3.org/1999/xlink">`+"\n",
		pr, w.Inches(), pr, h.Inches())

	// Swap the origin to the bottom left.
	// This must be matched with a </g> when saving,
	// before the closing </svg>.
	c.svg.Gtransform(fmt.Sprintf("scale(1, -1) translate(0, -%.*g)", pr, h.Dots(c)))

	vg.Initialize(c)
	return c
}
Beispiel #2
0
// New creates a new PDF Canvas.
func New(w, h vg.Length) *Canvas {
	c := &Canvas{
		doc:         pdf.New(),
		w:           w,
		h:           h,
		lineVisible: true,
	}
	c.page = c.doc.NewPage(unit(w), unit(h))
	vg.Initialize(c)
	return c
}
Beispiel #3
0
// NewImage returns a new image canvas
// that draws to the given image.  The
// minimum point of the given image
// should probably be 0,0.
func NewImage(img draw.Image) *Canvas {
	w := float64(img.Bounds().Max.X - img.Bounds().Min.X)
	h := float64(img.Bounds().Max.Y - img.Bounds().Min.Y)
	draw.Draw(img, img.Bounds(), image.White, image.ZP, draw.Src)
	gc := draw2d.NewGraphicContext(img)
	gc.SetDPI(dpi)
	gc.Scale(1, -1)
	gc.Translate(0, -h)
	c := &Canvas{
		gc:    gc,
		img:   img,
		w:     vg.Inches(w / dpi),
		h:     vg.Inches(h / dpi),
		color: []color.Color{color.Black},
	}
	vg.Initialize(c)
	return c
}
Beispiel #4
0
// NewTitle returns a new Canvas with the given title string.
func NewTitle(w, h vg.Length, title string) *Canvas {
	c := &Canvas{
		stk: []ctx{ctx{}},
		w:   w,
		h:   h,
		buf: new(bytes.Buffer),
	}
	c.buf.WriteString("%%!PS-Adobe-3.0 EPSF-3.0\n")
	c.buf.WriteString("%%Creator code.google.com/p/plotinum/vg/veceps\n")
	c.buf.WriteString("%%Title: " + title + "\n")
	c.buf.WriteString(fmt.Sprintf("%%%%BoundingBox: 0 0 %.*g %.*g\n",
		pr, w.Dots(c),
		pr, h.Dots(c)))
	c.buf.WriteString(fmt.Sprintf("%%%%CreationDate: %s\n", time.Now()))
	c.buf.WriteString("%%Orientation: Portrait\n")
	c.buf.WriteString("%%EndComments\n")
	c.buf.WriteString("\n")
	vg.Initialize(c)
	return c
}