95 lines
2.3 KiB
JavaScript
95 lines
2.3 KiB
JavaScript
var ACTION_LEFT = 1;
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var ACTION_RIGHT = 2;
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var ACTION_ROTATE = 3;
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var ACTION_DROP = 4;
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var game;
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function getAllPossibleDropLocations(brickId) {
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var dropLocations = [[game.width/2,game.height+1,0]];
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// Go as far down as possible:
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var goDown = function(x, y, rot) {
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var counter = 0;
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while (game.isValidBrickLoc(brickId, [x, y - counter], rot)) {
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counter++;
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}
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dropLocations.push([x,y - counter+1,rot]);
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}
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// For each of the four rotations:
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for (var i = 0; i < 4; i++) {
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// Try to go as far left as possible:
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var counter = 0;
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while(game.isValidBrickLoc(brickId, [game.currentBrickLoc[0]-counter,game.currentBrickLoc[1], i], i)) {
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goDown(game.currentBrickLoc[0]-counter, game.currentBrickLoc[1], i);
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counter++;
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}
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// Try to go as far right as possible:
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var counter = 0;
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do {
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goDown(game.currentBrickLoc[0]+counter, game.currentBrickLoc[1], i);
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counter++;
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} while(game.isValidBrickLoc(brickId, [game.currentBrickLoc[0]+counter,game.currentBrickLoc[1], i], i));
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}
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return dropLocations;
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}
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function chooseDropLocation(brickId) {
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var dropLocations = getAllPossibleDropLocations(brickId);
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/* Just find the lowest location possible: */
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var best = 0;
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for (var i = 0; i < dropLocations.length; i++) {
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if (dropLocations[i][1] < dropLocations[best][1]) {
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best = i;
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}
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}
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return dropLocations[best];
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}
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function chooseAction(dropLocation) {
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var dx = dropLocation[0] - game.currentBrickLoc[0];
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var dy = dropLocation[1] - game.currentBrickLoc[1];
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var dr = (dropLocation[2] - game.currentBrickRot + 4) % 4;
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if (dr != 0) return [ACTION_ROTATE, dr];
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if (dx < 0) return [ACTION_LEFT, -dx];
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if (dx > 0) return [ACTION_RIGHT, dx];
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return [ACTION_DROP, -dy];
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}
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function doAction(action) {
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if (action[1] == 0) {
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return;
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}
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if (action[0] == ACTION_LEFT) {
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game.moveCurrentBrickHorizontally(-1);
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} else if (action[0] == ACTION_RIGHT) {
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game.moveCurrentBrickHorizontally(1);
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} else if (action[0] == ACTION_ROTATE) {
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game.rotateCurrentBrick();
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} else if (action[0] == ACTION_DROP) {
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game.hardDrop();
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/* do nothing. */
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}
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}
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function startAI() {
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var dropLocation = chooseDropLocation(game.currentBrickId);
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var action = chooseAction(dropLocation);
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doAction(action);
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window.setTimeout(startAI, 50);
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}
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$(document).ready(function() {
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game = new TetrisGame("tetris-board", "lines", "next-bricks");
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game.startGame();
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startAI();
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});
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