All files / web/src/arcade-games/rithmomachia/utils boardCoordinates.ts

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
/**
 * Board coordinate calculation utilities
 */

export interface BoardPosition {
  x: number
  y: number
}

export interface BoardLayout {
  cellSize: number
  gap: number
  padding: number
}

/**
 * Parse square notation (e.g., "A1", "H8") into file and rank indices
 * @param square - Square notation (e.g., "A1")
 * @returns Object with file (0-7) and rank (1-8)
 */
export function parseSquare(square: string): { file: number; rank: number } {
  const file = square.charCodeAt(0) - 65 // 'A' = 0, 'B' = 1, etc.
  const rank = Number.parseInt(square.slice(1), 10)
  return { file, rank }
}

/**
 * Convert file and rank to row index (0-7, top to bottom)
 * @param rank - Rank number (1-8)
 * @returns Row index (0-7)
 */
export function rankToRow(rank: number): number {
  return 8 - rank
}

/**
 * Get the center position of a square on the board
 * @param square - Square notation (e.g., "A1")
 * @param layout - Board layout configuration
 * @returns Center position {x, y} in pixels
 */
export function getSquarePosition(square: string, layout: BoardLayout): BoardPosition {
  const { file, rank } = parseSquare(square)
  const row = rankToRow(rank)

  return {
    x: layout.padding + file * (layout.cellSize + layout.gap) + layout.cellSize / 2,
    y: layout.padding + row * (layout.cellSize + layout.gap) + layout.cellSize / 2,
  }
}

/**
 * Get the top-left corner position of a square on the board
 * @param square - Square notation (e.g., "A1")
 * @param layout - Board layout configuration
 * @returns Top-left position {x, y} in pixels
 */
export function getSquareCorner(square: string, layout: BoardLayout): BoardPosition {
  const { file, rank } = parseSquare(square)
  const row = rankToRow(rank)

  return {
    x: layout.padding + file * (layout.cellSize + layout.gap),
    y: layout.padding + row * (layout.cellSize + layout.gap),
  }
}

/**
 * Get the total board dimensions
 * @param layout - Board layout configuration
 * @returns Total width and height in pixels
 */
export function getBoardDimensions(layout: BoardLayout): {
  width: number
  height: number
} {
  const boardSize = 8 * layout.cellSize + 7 * layout.gap
  return {
    width: boardSize + 2 * layout.padding,
    height: boardSize + 2 * layout.padding,
  }
}