62 lines
1.1 KiB
Go
62 lines
1.1 KiB
Go
package types
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// coordinates starting at 1:1 and end at 8:8
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type Coordinate struct {
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Col int `json:"col"`
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Row int `json:"row"`
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}
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const (
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RangeLastValid = 8
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RangeFirstValid = 1
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RangeUpperInvalid = 9
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RangeLowerInvalid = 0
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)
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func (c Coordinate) Up(number int) *Coordinate {
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check := c.Row + number
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if check <= RangeLastValid {
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return &Coordinate{Row: check, Col: c.Col}
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}
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return nil
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}
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func (c Coordinate) Down(number int) *Coordinate {
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check := c.Row - number
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if check >= RangeFirstValid {
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return &Coordinate{Row: check, Col: c.Col}
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}
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return nil
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}
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// Right and left is seen from a board where row 1 is on the bottom
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func (c Coordinate) Right(number int) *Coordinate {
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check := c.Col + number
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if check >= RangeFirstValid {
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return &Coordinate{Row: c.Row, Col: check}
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}
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return nil
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}
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func (c Coordinate) Left(number int) *Coordinate {
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check := c.Col - number
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if check >= RangeFirstValid {
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return &Coordinate{Row: c.Row, Col: check}
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}
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return nil
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}
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type ChessColor string
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const (
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White ChessColor = "white"
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Black ChessColor = "black"
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)
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func (c ChessColor) Opposite() ChessColor {
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if c == White {
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return Black
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} else {
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return White
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}
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}
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