labyrinth-game-logic
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A libary that implements the boardgame labyrinth and exposes the functionality to create and interact with games
700 lines (686 loc) • 30 kB
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<h1><a href="index.html">All files</a> MoveGenerator.ts</h1>
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<div class='fl pad1y space-right2'>
<span class="strong">73.91% </span>
<span class="quiet">Statements</span>
<span class='fraction'>68/92</span>
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<div class='fl pad1y space-right2'>
<span class="strong">55.55% </span>
<span class="quiet">Branches</span>
<span class='fraction'>10/18</span>
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<span class="strong">75% </span>
<span class="quiet">Functions</span>
<span class='fraction'>6/8</span>
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<span class="strong">73.03% </span>
<span class="quiet">Lines</span>
<span class='fraction'>65/89</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* @author Timo Lehnertz
*/
import { Board } from "./Board";
import { BoardPosition } from "./BoardPosition";
import { GameState } from "./GameState";
import { Move } from "./Move";
import { ShiftPosition } from "./ShiftPosition";
import { Treasure } from "./Treasure";
const BEST_MOVE_WEIGHT = 10000;
/**
* Returns a number between 0 and BEST_MOVE_WEIGHT (inclusive) based on the standing
*/
export type EvaluatorFunction = (
gameState: GameState,
playerIndex: number
) => number;
export type MoveGenerator = (gameState: GameState) => Move;
export function generateShiftPositions(gameState: GameState): ShiftPosition[] {
return gameState.board.generateValidShiftPositions();
}
export function <span class="fstat-no" title="function not covered" >generateRandomMove(</span>gameState: GameState): Move {
const shiftPositions = <span class="cstat-no" title="statement not covered" >generateShiftPositions(gameState);</span>
const shiftPositionIndex = <span class="cstat-no" title="statement not covered" >Math.floor(Math.random() * shiftPositions.length);</span>
const moves = <span class="cstat-no" title="statement not covered" >generateMoves(</span>
gameState,
shiftPositions[shiftPositionIndex],
Math.floor(Math.random() * 4)
);
const index = <span class="cstat-no" title="statement not covered" >Math.floor(Math.random() * moves.length);</span>
<span class="cstat-no" title="statement not covered" > return moves[index];</span>
}
export function generateMoves(
gameState: GameState,
toShiftPosition: ShiftPosition,
rotation: number
): Move[] {
const moves: Move[] = [];
const movedGameState = gameState
.setShiftPosition(toShiftPosition)
.rotateLooseTile(rotation)
.insertLooseTile();
const playerState = movedGameState.allPlayerStates.getPlayerToMoveState();
const reachableFields = movedGameState.board.getReachablePositions(
playerState.position
);
for (const reachableField of reachableFields) {
const treasureAtTile = movedGameState.board.getTreasureAt(reachableField);
let collectedTreasure: Treasure | null = null;
if (Treasure.compare(treasureAtTile, playerState.currentTreasure)) {
collectedTreasure = playerState.currentTreasure;
}
moves.push(
new Move(
movedGameState.allPlayerStates.playerIndexToMove,
rotation,
gameState.board.shiftPosition,
toShiftPosition,
playerState.position,
reachableField,
collectedTreasure
)
);
}
return moves;
}
export function positionByTreasure(
board: Board,
treasure: Treasure
): BoardPosition | null {
for (let x = 0; x < board.width; x++) {
for (let y = 0; y < board.height; y++) {
const tile = board.getTile(new BoardPosition(x, y));
if (Treasure.compare(tile.treasure, treasure)) {
return new BoardPosition(x, y);
}
}
}
<span class="cstat-no" title="statement not covered" > return null;</span>
}
function <span class="fstat-no" title="function not covered" >shuffle(</span>array: any[]) {
let currentIndex = <span class="cstat-no" title="statement not covered" >array.length;</span>
// While there remain elements to shuffle...
<span class="cstat-no" title="statement not covered" > while (currentIndex != 0) {</span>
// Pick a remaining element...
let randomIndex = <span class="cstat-no" title="statement not covered" >Math.floor(Math.random() * currentIndex);</span>
<span class="cstat-no" title="statement not covered" > currentIndex--;</span>
// And swap it with the current element.
<span class="cstat-no" title="statement not covered" > [array[currentIndex], array[randomIndex]] = [</span>
array[randomIndex],
array[currentIndex],
];
}
}
/**
*
* @param evaluate Eval function
* @param strength number between 0 and 1 0 => random move, 1 => strongest move
* @returns The move generator
*/
export function buildMoveGenerator(
evaluate: EvaluatorFunction,
strength: number
): MoveGenerator {
return (gameState: GameState): Move => {
let bestMove: Move | null = null;
let bestStanding = Number.MIN_SAFE_INTEGER;
for (let rotation = 0; rotation < 4; rotation++) {
const shiftPositions = generateShiftPositions(gameState);
for (const shiftPosition of shiftPositions) {
const moves = generateMoves(gameState, shiftPosition, rotation);
<span class="missing-if-branch" title="if path not taken" >I</span>if (strength < 1) {
<span class="cstat-no" title="statement not covered" > shuffle(moves);</span>
}
const lookupAmount = Math.max(
moves.length - 1,
Math.min(1, Math.floor(moves.length * strength))
);
let i = 0;
for (const move of moves) {
if (i >= lookupAmount) {
break;
}
if (move.collectedTreasure !== null) {
return move;
}
let moveFound = false;
let standing = 0;
for (const historyMove of gameState.historyMoves) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (historyMove.equals(move)) {
<span class="cstat-no" title="statement not covered" > moveFound = true;</span>
<span class="cstat-no" title="statement not covered" > break;</span>
}
}
<span class="missing-if-branch" title="if path not taken" >I</span>if (moveFound) {
// never prefer a repeated moved move to avoid infinite games between bots
<span class="cstat-no" title="statement not covered" > standing = 0;</span>
} else {
const potentialState = gameState.move(move);
standing = evaluate(
potentialState,
gameState.allPlayerStates.playerIndexToMove
);
}
<span class="missing-if-branch" title="if path not taken" >I</span>if (standing === BEST_MOVE_WEIGHT) {
<span class="cstat-no" title="statement not covered" > return move;</span>
}
if (standing > bestStanding) {
bestStanding = standing;
bestMove = move;
}
i++;
}
}
}
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (bestMove === null) {</span>
<span class="cstat-no" title="statement not covered" > throw new Error("could not find any move");</span>
}
<span class="cstat-no" title="statement not covered" > return bestMove;</span>
};
}
export function manhattanEvaluator(gameState: GameState, playerIndex: number) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (gameState.getWinnerIndex() === playerIndex) {
<span class="cstat-no" title="statement not covered" > return BEST_MOVE_WEIGHT;</span>
}
const playerState = gameState.allPlayerStates.getPlayerState(playerIndex);
<span class="missing-if-branch" title="if path not taken" >I</span>if (playerState.currentTreasure === null) {
const home = <span class="cstat-no" title="statement not covered" >Board.getPlayerHomePosition(</span>
playerIndex,
gameState.board.width,
gameState.board.height
);
// playerState.position.distanceFrom(home) + Math.random() * 5;
const distance = <span class="cstat-no" title="statement not covered" >playerState.position.manhattanDistanceFrom(home);</span>
<span class="cstat-no" title="statement not covered" > return BEST_MOVE_WEIGHT - distance;</span>
}
// return Math.random();
const treasureLocation = positionByTreasure(
gameState.board,
playerState.currentTreasure
);
<span class="missing-if-branch" title="if path not taken" >I</span>if (treasureLocation === null) {
<span class="cstat-no" title="statement not covered" > return 0; </span>// treasure is on loose tile
}
// const distance = playerState.position.distanceFrom(treasureLocation);
const diff = playerState.position.subtract(treasureLocation);
if (Math.abs(diff.x) === 1 && Math.abs(diff.y) === 1) {
return BEST_MOVE_WEIGHT - 1;
} else {
const distance =
playerState.position.manhattanDistanceFrom(treasureLocation);
return BEST_MOVE_WEIGHT - distance;
}
}
</pre></td></tr></table></pre>
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