Пример #1
0
//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
}
Пример #2
0
		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)))