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package game
import (
"fmt"
)
// Position represents a zero-based position on the map.
// TODO: Change to a 1-based coordinate system.
//
// This allows to use the zero value as invalid Position.
//
// The origin is the upper left corner of the map.
type Position struct {
X int
Y int
}
const POSITION_FMT = "(%d, %d)"
func (p Position) String() string {
if p == INVALID_POSITION() {
return "INVALID_POSITION"
}
return fmt.Sprintf(POSITION_FMT, p.X, p.Y)
}
func INVALID_POSITION() Position {
return Position{-1, -1}
}
// Valid reports if a coordinate is smaller than 0.
func (p Position) Valid() bool {
return p.X >= 0 && p.Y >= 0
}
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