vec

Documentation

Index

• type Rasterizer
  • func NewRasterizer(dst draw.Image) *Rasterizer
  • func (z *Rasterizer) Draw(r image.Rectangle, src image.Image, sp image.Point)

Types

type Rasterizer

type Rasterizer struct {
	vector.Rasterizer

	// Dst is the image that the Draw call uses as destination to draw into.
	Dst draw.Image

	// DrawOp is a Porter-Duff compositing operator that will be used for the
	// next call to the Draw method. After that call finishes, DrawOp is set to
	// draw.Over.
	DrawOp draw.Op
}

Rasterizer that wraps an inner "golang.org/x/image/vector" Rasterizer. The dst image normally passed to a call Draw is set as a field so Draw does not have to take it as a parameter.

func NewRasterizer

func NewRasterizer(dst draw.Image) *Rasterizer

NewRasterizer returns a rasterizer for dst image, with the dst size used to reset the inner rasterizer.

func (*Rasterizer) Draw

func (z *Rasterizer) Draw(r image.Rectangle, src image.Image, sp image.Point)

Draw aligns r.Min in field Dst with sp in src and then replaces the rectangle r in Dst with the result of drawing src on Dst. The current value of the DrawOp field is used for drawing. But note, after drawing the DrawOp is reset to draw.Over.