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direction.go
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direction.go
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/*
* FrankyGo - UCI chess engine in GO for learning purposes
*
* MIT License
*
* Copyright (c) 2018-2020 Frank Kopp
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package types
import "fmt"
// Direction is a set of constants for moving squares within a Bb
type Direction int8
// Direction is a set of constants for moving squares within a Bb
//noinspection GoVarAndConstTypeMayBeOmitted
const (
North Direction = 8
East Direction = 1
South Direction = -North
West Direction = -East
Northeast Direction = North + East
Southeast Direction = South + East
Southwest Direction = South + West
Northwest Direction = North + West
)
// String returns a string representation of a Direction (e.g. N, E, ...,NW,...)
func (d Direction) String() string {
switch d {
case North:
return "N"
case East:
return "E"
case South:
return "S"
case West:
return "W"
case Northeast:
return "NE"
case Southeast:
return "SE"
case Southwest:
return "SW"
case Northwest:
return "NW"
default:
panic(fmt.Sprintf("Invalid direction %d", d))
}
}