//newPattern creates a SurfacePattern without a Surface method.
func newPattern(is cairo.ImageSurface) (cairo.Pattern, error) {
p, err := cairo.NewSurfacePattern(is)
if err != nil {
return nil, err
}
return mimepattern{p.XtensionPattern}, nil
}
if err = c.SetSourceSurface(i, cairo.ZP); err != nil {
return err
}
c.Paint()
return nil
}},
{"image-pattern", func(c *cairo.Context) error {
i, err := cairo.FromImage(img) //img declared globally and set in main
if err != nil {
return err
}
defer i.Close()
sz := i.Size()
pat, err := cairo.NewSurfacePattern(i)
if err != nil {
return err
}
defer pat.Close()
pat.SetExtend(cairo.ExtendRepeat)
off := pt(128, 128)
c.
Translate(off).
Rotate(math.Pi / 4).
Scale(pt(1/math.Sqrt2, 1/math.Sqrt2)).
Translate(off.Conj())
pat.SetMatrix(cairo.NewScaleMatrix(sz.Div(256).Mul(5)))