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Diffstat (limited to 'src/pkg/exp/draw/arith.go')
-rw-r--r-- | src/pkg/exp/draw/arith.go | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/src/pkg/exp/draw/arith.go b/src/pkg/exp/draw/arith.go deleted file mode 100644 index b72242aaa..000000000 --- a/src/pkg/exp/draw/arith.go +++ /dev/null @@ -1,155 +0,0 @@ -// Copyright 2009 The 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 draw - -// A Point is an X, Y coordinate pair. -type Point struct { - X, Y int -} - -// ZP is the zero Point. -var ZP Point - -// A Rectangle contains the Points with Min.X <= X < Max.X, Min.Y <= Y < Max.Y. -type Rectangle struct { - Min, Max Point -} - -// ZR is the zero Rectangle. -var ZR Rectangle - -// Pt is shorthand for Point{X, Y}. -func Pt(X, Y int) Point { return Point{X, Y} } - -// Rect is shorthand for Rectangle{Pt(x0, y0), Pt(x1, y1)}. -func Rect(x0, y0, x1, y1 int) Rectangle { return Rectangle{Point{x0, y0}, Point{x1, y1}} } - -// Rpt is shorthand for Rectangle{min, max}. -func Rpt(min, max Point) Rectangle { return Rectangle{min, max} } - -// Add returns the sum of p and q: Pt(p.X+q.X, p.Y+q.Y). -func (p Point) Add(q Point) Point { return Point{p.X + q.X, p.Y + q.Y} } - -// Sub returns the difference of p and q: Pt(p.X-q.X, p.Y-q.Y). -func (p Point) Sub(q Point) Point { return Point{p.X - q.X, p.Y - q.Y} } - -// Mul returns p scaled by k: Pt(p.X*k p.Y*k). -func (p Point) Mul(k int) Point { return Point{p.X * k, p.Y * k} } - -// Div returns p divided by k: Pt(p.X/k, p.Y/k). -func (p Point) Div(k int) Point { return Point{p.X / k, p.Y / k} } - -// Eq returns true if p and q are equal. -func (p Point) Eq(q Point) bool { return p.X == q.X && p.Y == q.Y } - -// In returns true if p is within r. -func (p Point) In(r Rectangle) bool { - return p.X >= r.Min.X && p.X < r.Max.X && - p.Y >= r.Min.Y && p.Y < r.Max.Y -} - -// Inset returns the rectangle r inset by n: Rect(r.Min.X+n, r.Min.Y+n, r.Max.X-n, r.Max.Y-n). -func (r Rectangle) Inset(n int) Rectangle { - return Rectangle{Point{r.Min.X + n, r.Min.Y + n}, Point{r.Max.X - n, r.Max.Y - n}} -} - -// Add returns the rectangle r translated by p: Rpt(r.Min.Add(p), r.Max.Add(p)). -func (r Rectangle) Add(p Point) Rectangle { return Rectangle{r.Min.Add(p), r.Max.Add(p)} } - -// Sub returns the rectangle r translated by -p: Rpt(r.Min.Sub(p), r.Max.Sub(p)). -func (r Rectangle) Sub(p Point) Rectangle { return Rectangle{r.Min.Sub(p), r.Max.Sub(p)} } - -// Canon returns a canonical version of r: the returned rectangle -// has Min.X <= Max.X and Min.Y <= Max.Y. -func (r Rectangle) Canon() Rectangle { - if r.Max.X < r.Min.X { - r.Min.X, r.Max.X = r.Max.X, r.Min.X - } - if r.Max.Y < r.Min.Y { - r.Min.Y, r.Max.Y = r.Max.Y, r.Min.Y - } - return r -} - -// Overlaps returns true if r and r1 cross; that is, it returns true if they share any point. -func (r Rectangle) Overlaps(r1 Rectangle) bool { - return r.Min.X < r1.Max.X && r1.Min.X < r.Max.X && - r.Min.Y < r1.Max.Y && r1.Min.Y < r.Max.Y -} - -// Empty retruns true if r contains no points. -func (r Rectangle) Empty() bool { return r.Max.X <= r.Min.X || r.Max.Y <= r.Min.Y } - -// InRect returns true if all the points in r are also in r1. -func (r Rectangle) In(r1 Rectangle) bool { - if r.Empty() { - return true - } - if r1.Empty() { - return false - } - return r1.Min.X <= r.Min.X && r.Max.X <= r1.Max.X && - r1.Min.Y <= r.Min.Y && r.Max.Y <= r1.Max.Y -} - -// Combine returns the smallest rectangle containing all points from r and from r1. -func (r Rectangle) Combine(r1 Rectangle) Rectangle { - if r.Empty() { - return r1 - } - if r1.Empty() { - return r - } - if r.Min.X > r1.Min.X { - r.Min.X = r1.Min.X - } - if r.Min.Y > r1.Min.Y { - r.Min.Y = r1.Min.Y - } - if r.Max.X < r1.Max.X { - r.Max.X = r1.Max.X - } - if r.Max.Y < r1.Max.Y { - r.Max.Y = r1.Max.Y - } - return r -} - -// Clip returns the largest rectangle containing only points shared by r and r1. -func (r Rectangle) Clip(r1 Rectangle) Rectangle { - if r.Empty() { - return r - } - if r1.Empty() { - return r1 - } - if !r.Overlaps(r1) { - return Rectangle{r.Min, r.Min} - } - if r.Min.X < r1.Min.X { - r.Min.X = r1.Min.X - } - if r.Min.Y < r1.Min.Y { - r.Min.Y = r1.Min.Y - } - if r.Max.X > r1.Max.X { - r.Max.X = r1.Max.X - } - if r.Max.Y > r1.Max.Y { - r.Max.Y = r1.Max.Y - } - return r -} - -// Dx returns the width of the rectangle r: r.Max.X - r.Min.X. -func (r Rectangle) Dx() int { return r.Max.X - r.Min.X } - -// Dy returns the width of the rectangle r: r.Max.Y - r.Min.Y. -func (r Rectangle) Dy() int { return r.Max.Y - r.Min.Y } - -// Eq returns true if r and r1 are equal. -func (r Rectangle) Eq(r1 Rectangle) bool { - return r.Min.Eq(r1.Min) && r.Max.Eq(r1.Max) -} |