private void CreateGrid()
{
// calculate pin spacing based on size of board and number of pins
var space = new Vector2(pinsContainer.rect.width / gridSize.x, pinsContainer.rect.height / gridSize.y);
// everything is centered around middle of game board so need an offset from that to start placing pins
var offs = (pinsContainer.rect.size * -0.5f) + (space * 0.5f);
// define the game board's grid (pins) and place initial tokens
grid = new GameBoardPin[gridSize.x * gridSize.y];
var idx = 0;
for (int x = 0; x < gridSize.x; x++)
{
for (int y = 0; y < gridSize.y; y++)
{
var gridPos = new Vector2Int(x, y);
// create and place the pin object
var pinRt = Instantiate(pinFab, this.pinsContainer).GetComponent <RectTransform>();
pinRt.anchoredPosition = offs + (space * gridPos);
// create a token if there is a token in this position at start
GameTokenDef def = startTokens.FirstOrDefault(t => t.startPos == gridPos);
GameToken token = null;
if (def != null)
{
if (def.tokenColor >= 0 && def.tokenColor < tokenColours.Length)
{
token = Instantiate(tokenFab, tokensContainer).GetComponent <GameToken>();
token.TokenColor = def.tokenColor;
token.image.color = tokenColours[def.tokenColor];
token.Rt.anchoredPosition = pinRt.anchoredPosition;
token.PrevAnchorPos = token.Rt.anchoredPosition;
}
else
{
Debug.LogError($"Invalid token colour: {def.tokenColor}. It must be in range 0..{tokenColours.Length-1}");
}
}
// initialize the grid position
grid[idx] = new GameBoardPin
{
pinRt = pinRt,
token = token,
};
idx++;
}
}
}
private void SnapTokenToPin(GameToken token)
{
// calculated from (token_size * minSnapFactor) to determine how close a token must be to pin before it will snap
float minDistToSnap = minSnapFactor * token.Rt.rect.height;
// find nearest open pin to the token
float dist = 0f;
GameBoardPin pin = null;
for (int i = 0; i < gridSize.x * gridSize.y; i++)
{
var p = grid[i];
if (p.token == null || p.token == token) // open pin or the pin this token came from
{
var d = Vector2.Distance(p.pinRt.localPosition, token.Rt.localPosition);
if (d <= minDistToSnap && (pin == null || d < dist))
{
pin = p;
dist = d;
}
}
}
// update token with new position in grid
if (pin != null)
{
// remove token from old position in grid
var p = grid.FirstOrDefault(g => g.token == token);
if (p != null)
{
p.token = null;
}
else
{
Debug.LogError("This should not happen. There is a bug somewhere with tokens not being linked to pins/grid positions.");
}
// place it in new position
pin.token = token;
token.Rt.anchoredPosition = pin.pinRt.anchoredPosition;
token.PrevAnchorPos = token.Rt.anchoredPosition;
}
else
{
// snap back to previous position
token.Rt.anchoredPosition = token.PrevAnchorPos;
}
}