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direction.go
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direction.go
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package main
type Direction int
const (
DirectionUp Direction = 0
DirectionDown Direction = iota
DirectionLeft
DirectionRight
DirectionUpLeft
DirectionUpRight
DirectionDownLeft
DirectionDownRight
)
func DirectionFromCoords(dx, dy int) Direction {
if dx == 0 && dy == -1 {
return DirectionUp
} else if dx == 0 && dy == 1 {
return DirectionDown
} else if dx == -1 && dy == 0 {
return DirectionLeft
} else if dx == 1 && dy == 0 {
return DirectionRight
} else if dx == -1 && dy == -1 {
return DirectionUpLeft
} else if dx == 1 && dy == -1 {
return DirectionUpRight
} else if dx == -1 && dy == 1 {
return DirectionDownLeft
} else if dx == 1 && dy == 1 {
return DirectionDownRight
}
panic("bad coords for direction")
}
func (d Direction) Coords() (dx, dy int) {
switch d {
case DirectionUp:
dy--
case DirectionDown:
dy++
case DirectionLeft:
dx--
case DirectionRight:
dx++
case DirectionUpLeft:
dy--
dx--
case DirectionUpRight:
dy--
dx++
case DirectionDownLeft:
dy++
dx--
case DirectionDownRight:
dy++
dx++
default:
panic("bad direction encountered")
}
return
}
func randomDirection() Direction {
return Direction(RandIntRange(0, 7))
}