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add method to change drawing interpolator #131

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add method to change drawing interpolator #131

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10 changes: 8 additions & 2 deletions context.go
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Original file line number Diff line number Diff line change
Expand Up @@ -77,6 +77,7 @@ type Context struct {
fontHeight float64
matrix Matrix
stack []*Context
interpolator draw.Interpolator
}

// NewContext creates a new image.RGBA with the specified width and height
Expand Down Expand Up @@ -109,9 +110,14 @@ func NewContextForRGBA(im *image.RGBA) *Context {
fontFace: basicfont.Face7x13,
fontHeight: 13,
matrix: Identity(),
interpolator: draw.BiLinear,
}
}

func (dc *Context) SetInterpolator(interpolator draw.Interpolator) {
dc.interpolator = interpolator
}

// GetCurrentPoint will return the current point and if there is a current point.
// The point will have been transformed by the context's transformation matrix.
func (dc *Context) GetCurrentPoint() (Point, bool) {
Expand Down Expand Up @@ -673,7 +679,7 @@ func (dc *Context) DrawImageAnchored(im image.Image, x, y int, ax, ay float64) {
s := im.Bounds().Size()
x -= int(ax * float64(s.X))
y -= int(ay * float64(s.Y))
transformer := draw.BiLinear
transformer := dc.interpolator
fx, fy := float64(x), float64(y)
m := dc.matrix.Translate(fx, fy)
s2d := f64.Aff3{m.XX, m.XY, m.X0, m.YX, m.YY, m.Y0}
Expand Down Expand Up @@ -728,7 +734,7 @@ func (dc *Context) drawString(im *image.RGBA, s string, x, y float64) {
continue
}
sr := dr.Sub(dr.Min)
transformer := draw.BiLinear
transformer := dc.interpolator
fx, fy := float64(dr.Min.X), float64(dr.Min.Y)
m := dc.matrix.Translate(fx, fy)
s2d := f64.Aff3{m.XX, m.XY, m.X0, m.YX, m.YY, m.Y0}
Expand Down