From f43d35507827216071896cae83544fef1c4c35eb Mon Sep 17 00:00:00 2001 From: Jack Date: Wed, 23 Sep 2015 19:54:07 -0700 Subject: godep save --- .../p/graphics-go/graphics/affine.go | 174 --------------------- 1 file changed, 174 deletions(-) delete mode 100644 Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/affine.go (limited to 'Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/affine.go') diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/affine.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/affine.go deleted file mode 100644 index 0ac2ec9da..000000000 --- a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/affine.go +++ /dev/null @@ -1,174 +0,0 @@ -// Copyright 2011 The Graphics-Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package graphics - -import ( - "code.google.com/p/graphics-go/graphics/interp" - "errors" - "image" - "image/draw" - "math" -) - -// I is the identity Affine transform matrix. -var I = Affine{ - 1, 0, 0, - 0, 1, 0, - 0, 0, 1, -} - -// Affine is a 3x3 2D affine transform matrix. -// M(i,j) is Affine[i*3+j]. -type Affine [9]float64 - -// Mul returns the multiplication of two affine transform matrices. -func (a Affine) Mul(b Affine) Affine { - return Affine{ - a[0]*b[0] + a[1]*b[3] + a[2]*b[6], - a[0]*b[1] + a[1]*b[4] + a[2]*b[7], - a[0]*b[2] + a[1]*b[5] + a[2]*b[8], - a[3]*b[0] + a[4]*b[3] + a[5]*b[6], - a[3]*b[1] + a[4]*b[4] + a[5]*b[7], - a[3]*b[2] + a[4]*b[5] + a[5]*b[8], - a[6]*b[0] + a[7]*b[3] + a[8]*b[6], - a[6]*b[1] + a[7]*b[4] + a[8]*b[7], - a[6]*b[2] + a[7]*b[5] + a[8]*b[8], - } -} - -func (a Affine) transformRGBA(dst *image.RGBA, src *image.RGBA, i interp.RGBA) error { - srcb := src.Bounds() - b := dst.Bounds() - for y := b.Min.Y; y < b.Max.Y; y++ { - for x := b.Min.X; x < b.Max.X; x++ { - sx, sy := a.pt(x, y) - if inBounds(srcb, sx, sy) { - c := i.RGBA(src, sx, sy) - off := (y-dst.Rect.Min.Y)*dst.Stride + (x-dst.Rect.Min.X)*4 - dst.Pix[off+0] = c.R - dst.Pix[off+1] = c.G - dst.Pix[off+2] = c.B - dst.Pix[off+3] = c.A - } - } - } - return nil -} - -// Transform applies the affine transform to src and produces dst. -func (a Affine) Transform(dst draw.Image, src image.Image, i interp.Interp) error { - if dst == nil { - return errors.New("graphics: dst is nil") - } - if src == nil { - return errors.New("graphics: src is nil") - } - - // RGBA fast path. - dstRGBA, dstOk := dst.(*image.RGBA) - srcRGBA, srcOk := src.(*image.RGBA) - interpRGBA, interpOk := i.(interp.RGBA) - if dstOk && srcOk && interpOk { - return a.transformRGBA(dstRGBA, srcRGBA, interpRGBA) - } - - srcb := src.Bounds() - b := dst.Bounds() - for y := b.Min.Y; y < b.Max.Y; y++ { - for x := b.Min.X; x < b.Max.X; x++ { - sx, sy := a.pt(x, y) - if inBounds(srcb, sx, sy) { - dst.Set(x, y, i.Interp(src, sx, sy)) - } - } - } - return nil -} - -func inBounds(b image.Rectangle, x, y float64) bool { - if x < float64(b.Min.X) || x >= float64(b.Max.X) { - return false - } - if y < float64(b.Min.Y) || y >= float64(b.Max.Y) { - return false - } - return true -} - -func (a Affine) pt(x0, y0 int) (x1, y1 float64) { - fx := float64(x0) + 0.5 - fy := float64(y0) + 0.5 - x1 = fx*a[0] + fy*a[1] + a[2] - y1 = fx*a[3] + fy*a[4] + a[5] - return x1, y1 -} - -// TransformCenter applies the affine transform to src and produces dst. -// Equivalent to -// a.CenterFit(dst, src).Transform(dst, src, i). -func (a Affine) TransformCenter(dst draw.Image, src image.Image, i interp.Interp) error { - if dst == nil { - return errors.New("graphics: dst is nil") - } - if src == nil { - return errors.New("graphics: src is nil") - } - - return a.CenterFit(dst.Bounds(), src.Bounds()).Transform(dst, src, i) -} - -// Scale produces a scaling transform of factors x and y. -func (a Affine) Scale(x, y float64) Affine { - return a.Mul(Affine{ - 1 / x, 0, 0, - 0, 1 / y, 0, - 0, 0, 1, - }) -} - -// Rotate produces a clockwise rotation transform of angle, in radians. -func (a Affine) Rotate(angle float64) Affine { - s, c := math.Sincos(angle) - return a.Mul(Affine{ - +c, +s, +0, - -s, +c, +0, - +0, +0, +1, - }) -} - -// Shear produces a shear transform by the slopes x and y. -func (a Affine) Shear(x, y float64) Affine { - d := 1 - x*y - return a.Mul(Affine{ - +1 / d, -x / d, 0, - -y / d, +1 / d, 0, - 0, 0, 1, - }) -} - -// Translate produces a translation transform with pixel distances x and y. -func (a Affine) Translate(x, y float64) Affine { - return a.Mul(Affine{ - 1, 0, -x, - 0, 1, -y, - 0, 0, +1, - }) -} - -// Center produces the affine transform, centered around the provided point. -func (a Affine) Center(x, y float64) Affine { - return I.Translate(-x, -y).Mul(a).Translate(x, y) -} - -// CenterFit produces the affine transform, centered around the rectangles. -// It is equivalent to -// I.Translate(-
).Mul(a).Translate(
) -func (a Affine) CenterFit(dst, src image.Rectangle) Affine { - dx := float64(dst.Min.X) + float64(dst.Dx())/2 - dy := float64(dst.Min.Y) + float64(dst.Dy())/2 - sx := float64(src.Min.X) + float64(src.Dx())/2 - sy := float64(src.Min.Y) + float64(src.Dy())/2 - return I.Translate(-sx, -sy).Mul(a).Translate(dx, dy) -} -- cgit v1.2.3-1-g7c22