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image: add an offset to Tiled.

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R=r, r2
CC=golang-dev
https://golang.org/cl/2469041
This commit is contained in:
Nigel Tao 2010-10-13 12:05:21 +11:00
parent 712109f1f1
commit 93159e32e7
2 changed files with 15 additions and 16 deletions
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14
src/pkg/image/geom.go
View File

@ -43,15 +43,13 @@ func (p Point) Div(k int) Point {
func (p Point) Mod(r Rectangle) Point {
w, h := r.Dx(), r.Dy()
p = p.Sub(r.Min)
if p.X >= 0 {
p.X = p.X % w
} else {
p.X = w - 1 - (-1-p.X)%w
p.X = p.X % w
if p.X < 0 {
p.X += w
}
if p.Y >= 0 {
p.Y = p.Y % h
} else {
p.Y = h - 1 - (-1-p.Y)%h
p.Y = p.Y % h
if p.Y < 0 {
p.Y += h
}
return p.Add(r.Min)
}

17
src/pkg/image/names.go
View File

@ -15,7 +15,7 @@ var (
Opaque = NewColorImage(Alpha16Color{0xffff})
)
// A ColorImage is a practically infinite-sized Image of uniform Color.
// A ColorImage is an infinite-sized Image of uniform Color.
// It implements both the Color and Image interfaces.
type ColorImage struct {
C Color
@ -43,11 +43,12 @@ func NewColorImage(c Color) *ColorImage {
return &ColorImage{c}
}
// A Tiled is a practically infinite-sized Image that repeats another Image in
// both directions. Tiled{i}.At(x, y) will equal i.At(x, y) for all points
// within i's Bounds.
// A Tiled is an infinite-sized Image that repeats another Image in both
// directions. Tiled{i, p}.At(x, y) will equal i.At(x+p.X, y+p.Y) for all
// points {x+p.X, y+p.Y} within i's Bounds.
type Tiled struct {
I Image
I Image
Offset Point
}
func (t *Tiled) ColorModel() ColorModel {
@ -57,10 +58,10 @@ func (t *Tiled) ColorModel() ColorModel {
func (t *Tiled) Bounds() Rectangle { return Rectangle{Point{-1e9, -1e9}, Point{1e9, 1e9}} }
func (t *Tiled) At(x, y int) Color {
p := Point{x, y}.Mod(t.I.Bounds())
p := Point{x, y}.Add(t.Offset).Mod(t.I.Bounds())
return t.I.At(p.X, p.Y)
}
func NewTiled(i Image) *Tiled {
return &Tiled{i}
func NewTiled(i Image, offset Point) *Tiled {
return &Tiled{i, offset}
}