func NewPSSurface(filename string, widthInPoints, heightInPoints float64, level PSLevel) *Surface {
cs := C.CString(filename)
defer C.free(unsafe.Pointer(cs))
s := C.cairo_ps_surface_create(cs, C.double(widthInPoints), C.double(heightInPoints))
C.cairo_ps_surface_restrict_to_level(s, C.cairo_ps_level_t(level))
return &Surface{surface: s, context: C.cairo_create(s)}
}
// Format is determined from filename extension
// Supported formats: eps, jpeg, pdf, png, ps, svg
//
// Width and height are in pts for eps, pdf, ps, and svg; pixels for jpeg and png.
// Pixel measures will be truncated into integers
//
// Close the graphic to write the file
func Create(filename string, width float64, height float64) (*Graphic, error) {
g := &Graphic{}
var err error
filename = filepath.Clean(filename)
g.filename, err = filepath.Abs(filename)
if err != nil {
return nil, err
}
g.format = filepath.Ext(filename)[1:]
// create the surface
switch g.format {
case "pdf":
g.surface = C.cairo_pdf_surface_create(
C.CString(filename),
C.double(width),
C.double(height),
)
case "png", "jpeg":
g.surface = C.cairo_image_surface_create(
C.CAIRO_FORMAT_ARGB32,
C.int(width),
C.int(height),
)
case "ps", "eps":
g.surface = C.cairo_ps_surface_create(
C.CString(filename),
C.double(width),
C.double(height),
)
if g.format == "eps" {
C.cairo_ps_surface_set_eps(g.surface, 1)
}
case "svg":
g.surface = C.cairo_svg_surface_create(
C.CString(filename),
C.double(width),
C.double(height),
)
default:
return nil, errors.New("cairo: unsupported format: " + g.format)
}
err = g.cairoSurfaceStatus()
if err != nil {
return nil, err
}
// create the cairo context
g.cr = C.cairo_create(g.surface)
err = g.cairoStatus()
if err != nil {
return nil, err
}
return g, nil
}