51 lines
901 B
Go
51 lines
901 B
Go
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package soko
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import "opslag.de/schobers/geom"
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type Direction int
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const (
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DirectionUp Direction = iota
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DirectionRight
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DirectionDown
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DirectionLeft
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)
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var Directions = [4]Direction{DirectionUp, DirectionRight, DirectionDown, DirectionLeft}
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func (d Direction) String() string {
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switch d {
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case DirectionUp:
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return "up"
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case DirectionRight:
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return "right"
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case DirectionDown:
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return "down"
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case DirectionLeft:
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return "left"
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}
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return "invalid"
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}
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func (d Direction) ToPoint() geom.Point {
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switch d {
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case DirectionUp:
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return geom.Pt(0, -1)
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case DirectionRight:
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return geom.Pt(1, 0)
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case DirectionDown:
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return geom.Pt(0, 1)
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case DirectionLeft:
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return geom.Pt(-1, 0)
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}
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return geom.Point{}
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}
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func Neighbours(p geom.Point) []geom.Point {
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neighbours := make([]geom.Point, 4)
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for i, dir := range Directions {
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neighbours[i] = p.Add(dir.ToPoint())
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}
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return neighbours
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}
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