diff options
Diffstat (limited to 'src/pkg/image/geom.go')
| -rw-r--r-- | src/pkg/image/geom.go | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/src/pkg/image/geom.go b/src/pkg/image/geom.go index ccfe9cdb0..667aee625 100644 --- a/src/pkg/image/geom.go +++ b/src/pkg/image/geom.go @@ -38,6 +38,12 @@ func (p Point) Div(k int) Point { return Point{p.X / k, p.Y / k} } +// In returns whether p is in r. +func (p Point) In(r Rectangle) bool { + return r.Min.X <= p.X && p.X < r.Max.X && + r.Min.Y <= p.Y && p.Y < r.Max.Y +} + // Mod returns the point q in r such that p.X-q.X is a multiple of r's width // and p.Y-q.Y is a multiple of r's height. func (p Point) Mod(r Rectangle) Point { @@ -190,10 +196,15 @@ func (r Rectangle) Overlaps(s Rectangle) bool { r.Min.Y < s.Max.Y && s.Min.Y < r.Max.Y } -// Contains returns whether r contains p. -func (r Rectangle) Contains(p Point) bool { - return p.X >= r.Min.X && p.X < r.Max.X && - p.Y >= r.Min.Y && p.Y < r.Max.Y +// In returns whether every point in r is in s. +func (r Rectangle) In(s Rectangle) bool { + if r.Empty() { + return true + } + // Note that r.Max is an exclusive bound for r, so that r.In(s) + // does not require that r.Max.In(s). + return s.Min.X <= r.Min.X && r.Max.X <= s.Max.X && + s.Min.Y <= r.Min.Y && r.Max.Y <= s.Max.Y } // Canon returns the canonical version of r. The returned rectangle has minimum |