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
}
// New returns a new image canvas with
// the size specified rounded up to the
// nearest pixel.
func New(width, height vg.Length, name string) (*XImgCanvas, error) {
w := width.Inches() * dpi
h := height.Inches() * dpi
img := image.NewRGBA(image.Rect(0, 0, int(w+0.5), int(h+0.5)))
return NewImage(img, name)
}
// New returns a new image canvas with
// the size specified rounded up to the
// nearest pixel.
func New(width, height vg.Length) *Canvas {
w := width.Inches() * dpi
h := height.Inches() * dpi
img := image.NewRGBA(image.Rect(0, 0, int(w+0.5), int(h+0.5)))
return NewImage(img)
}