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[vchess.git] / client / src / utils / printDiagram.js

import { ArrayFun } from "@/utils/array";

// Turn (human) marks into coordinates
function getMarkArray(marks)
{
  if (!marks || marks == "-")
    return [];
  let markArray = ArrayFun.init(V.size.x, V.size.y, false);
  const squares = marks.split(",");
  for (let i=0; i<squares.length; i++)
  {
    const coords = V.SquareToCoords(squares[i]);
    markArray[coords.x][coords.y] = true;
  }
  return markArray;
}

// Turn (human) shadow indications into coordinates
function getShadowArray(shadow)
{
  if (!shadow || shadow == "-")
    return [];
  let shadowArray = ArrayFun.init(V.size.x, V.size.y, false);
  const squares = shadow.split(",");
  for (let i=0; i<squares.length; i++)
  {
    const rownum = V.size.x - parseInt(squares[i]);
    if (!isNaN(rownum))
    {
      // Shadow a full row
      for (let i=0; i<V.size.y; i++)
        shadowArray[rownum][i] = true;
      continue;
    }
    if (squares[i].length == 1)
    {
      // Shadow a full column
      const colnum = V.ColumnToCoord(squares[i]);
      for (let i=0; i<V.size.x; i++)
        shadowArray[i][colnum] = true;
      continue;
    }
    if (squares[i].indexOf("-") >= 0)
    {
      // Shadow a range of squares, horizontally or vertically
      const firstLastSq = squares[i].split("-");
      const range =
      [
        V.SquareToCoords(firstLastSq[0]),
        V.SquareToCoords(firstLastSq[1])
      ];
      const step =
      [
        range[1].x == range[0].x
          ? 0
          : (range[1].x - range[0].x) / Math.abs(range[1].x - range[0].x),
        range[1].y == range[0].y
          ? 0
          : (range[1].y - range[0].y) / Math.abs(range[1].y - range[0].y)
      ];
      // Convention: range always from smaller to larger number
      for (let x=range[0].x, y=range[0].y; x <= range[1].x && y <= range[1].y;
        x += step[0], y += step[1])
      {
        shadowArray[x][y] = true;
      }
      continue;
    }
    // Shadow just one square:
    const coords = V.SquareToCoords(squares[i]);
    shadowArray[coords.x][coords.y] = true;
  }
  return shadowArray;
}

// args: object with position (mandatory), and
// orientation, marks, shadow (optional)
export function getDiagram(args)
{
  // Obtain the array of pieces images names:
  const board = V.GetBoard(args.position);
  const orientation = args.orientation || "w";
  const markArray = getMarkArray(args.marks);
  const shadowArray = getShadowArray(args.shadow);
  let boardDiv = "";
  const [startX,startY,inc] = orientation == 'w'
    ? [0, 0, 1]
    : [V.size.x-1, V.size.y-1, -1];
  for (let i=startX; i>=0 && i<V.size.x; i+=inc)
  {
    boardDiv += "<div class='row'>";
    for (let j=startY; j>=0 && j<V.size.y; j+=inc)
    {
      boardDiv += "<div class='board board" + V.size.y + " " +
        ((i+j)%2==0 ? "light-square-diag" : "dark-square-diag") +
        (shadowArray.length > 0 && shadowArray[i][j] ? " in-shadow" : "") +
        "'>";
      if (board[i][j] != V.EMPTY)
      {
        boardDiv += "<img " +
          "src='/images/pieces/" + V.getPpath(board[i][j]) + ".svg' " +
          "class='piece'/>";
      }
      if (markArray.length > 0 && markArray[i][j])
        boardDiv += "<img src='/images/mark.svg' class='mark-square'/>";
      boardDiv += "</div>";
    }
    boardDiv += "</div>";
  }
  return boardDiv;
}