380 lines
13 KiB
JavaScript
380 lines
13 KiB
JavaScript
const Direction = Object.freeze({
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Up: { name: "up" },
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Right: { name: "right" },
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Down: { name: "down" },
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Left: { name: "left" },
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get values() { return Object.values(Direction); },
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fromName(name) { return this.values.filter(i=>i.name == name)[0] || null; },
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});
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const globals = {
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grid: null,
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};
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const btnStart_onClick = () => {
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globals.grid = makeGrid(4, 4, {value: 0, visible: false});
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addRandomTile();
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// globals.grid = makeDevGrid([ // can't slide down or left
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// [2,1,3,4],
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// [3,5,7,9],
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// [1,2,1,2],
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// [3,4,5,0],
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// ]);
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redraw(globals.grid);
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}
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const btnRedraw_onClick = () => {
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redraw(globals.grid);
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}
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const getSettingsForDirection = (direction) => {
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let settings = {
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merge: (from, to) => {
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to.value++;
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from.value = 0;
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from.visible = false;
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}
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};
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if (direction === Direction.Up || direction === Direction.Left) {
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settings = {
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...settings,
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advance: i => i + 1,
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testForDone: (fromIndex, length) => fromIndex >= length,
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getInitialFromIndex: () => 1,
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getInitialToIndex: () => 0
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};
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} else if (direction === Direction.Down || direction === Direction.Right) {
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settings = {
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...settings,
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advance: i => i - 1,
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testForDone: fromIndex => fromIndex < 0,
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getInitialFromIndex: (length) => length - 2,
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getInitialToIndex: (length) => length - 1
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};
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}
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if (direction === Direction.Up || direction === Direction.Down) {
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settings = {
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...settings,
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getVector: (grid, index) => grid.getColumn(index),
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swap: (grid, vector, columnIndex, from, to) => {
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grid.swapTiles(from, columnIndex, to, columnIndex);
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const tempTile = vector[to];
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vector[to] = vector[from];
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vector[from] = tempTile;
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},
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getLength: (grid) => grid.numColumns
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}
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} else if (direction === Direction.Left || direction === Direction.Right) {
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settings = {
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...settings,
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getVector: (grid, index) => grid.getRow(index),
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swap: (grid, vector, rowIndex, from, to) => {
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grid.swapTiles(rowIndex, from, rowIndex, to);
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const tempTile = vector[to];
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vector[to] = vector[from];
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vector[from] = tempTile;
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},
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getLength: (grid) => grid.numRows
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}
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}
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return settings;
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}
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const slideInDirection = (grid, direction) => {
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const settings = getSettingsForDirection(direction);
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const length = settings.getLength(grid);
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let didChange = false;
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for (let index = 0; index < length; index++) {
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const vector = settings.getVector(grid, index);
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const swap = settings.swap.bind(this, grid, vector, index);
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const initialFromIndex = settings.getInitialFromIndex(vector.length);
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const initialToIndex = settings.getInitialToIndex(vector.length);
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const didChangeThisPass = slide(
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initialFromIndex,
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initialToIndex,
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vector,
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settings.advance,
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swap,
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settings.merge,
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settings.testForDone
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);
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didChange = didChange || didChangeThisPass;
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}
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return didChange;
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}
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const playMove = (grid, direction) => {
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if (slideInDirection(grid, direction)) {
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addRandomTile();
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redraw(grid)
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} else {
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alert(`Unable to slide ${direction.name}.`);
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}
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checkForEnd(grid);
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}
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const btnUp_onClick = () => {
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playMove(globals.grid, Direction.Up);
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}
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const btnDown_onClick = () => {
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playMove(globals.grid, Direction.Down);
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}
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const btnLeft_onClick = () => {
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playMove(globals.grid, Direction.Left);
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}
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const btnRight_onClick = () => {
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playMove(globals.grid, Direction.Right);
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}
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const drawGrid = (grid, element) => {
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// grid is our grid
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// element is our div
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let text = "<table cellspacing=\"0\">\n";
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for (let rowIndex = 0; rowIndex < grid.numRows; rowIndex++) {
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text += " <tr>\n";
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for (let columnIndex = 0; columnIndex < grid.numColumns; columnIndex++) {
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const tile = grid.getTile(rowIndex, columnIndex);
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text += " <td title=\"(" + tile.originalLocation.row + ", " + tile.originalLocation.column + ")\"class=\"" + (tile.visible ? "visible " : "hidden ") + "\">" + tile.value + "</td>\n";
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}
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text += " </tr>\n";
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}
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text += "</table>";
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element.innerHTML = text;
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}
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const makeGrid = (numRows, numColumns, initialValue) => {
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const tiles = [];
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const rows = [];
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for (rowIndex = 0; rowIndex < numRows; rowIndex++) {
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const row = [];
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for (columnIndex = 0; columnIndex < numColumns; columnIndex++) {
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position = {row: rowIndex, column: columnIndex};
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const tile = makeTile(initialValue.value, initialValue.visible, rowIndex, columnIndex);
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tiles.push(tile);
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row.push(tile);
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}
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rows.push(row);
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}
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const getTile = (grid, row, column) => {
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return grid.getTile(row, column);
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}
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const grid = {
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rows,
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numRows,
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numColumns,
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tiles,
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clone: () => {
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const newGrid = makeGrid(numRows, numColumns, makeTile(0, false, 0, 0));
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for (let rowIndex = 0; rowIndex < numRows; rowIndex++) {
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for (let columnIndex = 0; columnIndex < numColumns; columnIndex++) {
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const newTile = newGrid.getTile(rowIndex, columnIndex);
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const oldTile = grid.getTile(rowIndex, columnIndex);
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newTile.originalLocation.column = oldTile.originalLocation.column;
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newTile.originalLocation.row = oldTile.originalLocation.row;
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newTile.value = oldTile.value;
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newTile.visible = oldTile.visible;
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}
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}
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return newGrid;
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},
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getColumn: (index) => {
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let vector = [];
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for (let rowIndex = 0; rowIndex < grid.numRows; rowIndex++) {
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vector.push(grid.getTile(rowIndex, index));
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}
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return vector;
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},
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getRow: (index) => {
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let vector = [];
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for (let columnIndex = 0; columnIndex < grid.numColumns; columnIndex++) {
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vector.push(grid.getTile(index, columnIndex));
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}
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return vector;
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},
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getTile: (row, column) => {
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if (row >= 0 && row < numRows && column >= 0 && column < numColumns) {
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return rows[column][row];
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}
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return null;
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},
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setTile: (row, column, tile) => {
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if (row >= 0 && row < numRows && column >= 0 && column < numColumns) {
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rows[column][row] = tile;
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}
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},
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swapTiles: (fromRow, fromColumn, toRow, toColumn) => {
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if (
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fromRow >= 0 && fromRow < numRows
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&& fromColumn >= 0 && fromColumn < numColumns
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&& toRow >= 0 && toRow < numRows
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&& toColumn >= 0 && toColumn < numColumns) {
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fromTile = grid.getTile(fromRow, fromColumn);
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toTile = grid.getTile(toRow, toColumn);
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// maybe set previous locations on the tiles
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grid.setTile(fromRow, fromColumn, toTile);
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grid.setTile(toRow, toColumn, fromTile);
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}
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},
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toString: (mapFn = i => i.value) => {
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return "[[" + mapFn(grid.getTile(0, 0)) + "," + mapFn(grid.getTile(0, 1)) + "," + mapFn(grid.getTile(0, 2)) + "," + mapFn(grid.getTile(0, 3)) + "],\n"
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+ " [" + mapFn(grid.getTile(1, 0)) + "," + mapFn(grid.getTile(1, 1)) + "," + mapFn(grid.getTile(1, 2)) + "," + mapFn(grid.getTile(1, 3)) + "],\n"
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+ " [" + mapFn(grid.getTile(2, 0)) + "," + mapFn(grid.getTile(2, 1)) + "," + mapFn(grid.getTile(2, 2)) + "," + mapFn(grid.getTile(2, 3)) + "],\n"
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+ " [" + mapFn(grid.getTile(3, 0)) + "," + mapFn(grid.getTile(3, 1)) + "," + mapFn(grid.getTile(3, 2)) + "," + mapFn(grid.getTile(3, 3)) + "]]";
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}
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};
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return grid;
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}
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const makeTile = (value, visible, row, column) => {
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const tile = {
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value,
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visible,
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originalLocation: {
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row,
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column,
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},
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equals: (other) => {
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return tile.value == other.value
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&& tile.visible == other.visible
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&& tile.originalLocation.row == other.originalLocation.row
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&& tile.originalLocation.column == other.originalLocation.column;
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},
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toString: (format = i => `{ value: ${i.value}, originalLocation: { row: ${i.originalLocation.row}, column: ${i.originalLocation.column} }, visible: ${i.visible ? "true" : "false"} }`) => {
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return format(tile);
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}
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};
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return tile;
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};
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const addRandomTile = () => {
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const hiddenTiles = globals.grid.tiles.filter(tile => !tile.visible);
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if (hiddenTiles.length <=0) return;
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const index = Math.floor(Math.random() * hiddenTiles.length);
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const tile = hiddenTiles[index];
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tile.value = 1;
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tile.visible = true;
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}
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const redraw = (grid) => {
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const element = document.getElementById('output');
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drawGrid(grid, element);
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}
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const slide = (fromIndex, toIndex, vector, advance, swap, merge, testForDone) => {
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let didIDoIt = false;
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let hasMergedPrevious = false;
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while(!testForDone(fromIndex, vector.length)) {
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const fromTile = vector[fromIndex];
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const toTile = toIndex < vector.length && toIndex >= 0 ? vector[toIndex] : null;
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if (toTile == null) {
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// Advance toIndex
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toIndex = advance(toIndex);
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hasMergedPrevious = false;
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continue;
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}
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if (fromIndex == toIndex) {
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// Advance fromIndex
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fromIndex = advance(fromIndex);
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hasMergedPrevious = false;
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continue;
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}
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if (!toTile.visible) {
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if (fromTile.visible) {
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swap(fromIndex, toIndex);
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// Advance fromIndex
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fromIndex = advance(fromIndex);
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hasMergedPrevious = false;
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didIDoIt = true;
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} else {
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// Advance fromIndex
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fromIndex = advance(fromIndex);
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}
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} else {
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if (fromTile.visible) {
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if (fromTile.value == toTile.value) {
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if (hasMergedPrevious) {
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// Advance toIndex
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toIndex = advance(toIndex);
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hasMergedPrevious = false;
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didIDoIt = true;
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} else {
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// Merge tiles
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merge(fromTile, toTile);
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// Advance fromIndex
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fromIndex = advance(fromIndex);
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hasMergedPrevious = true;
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didIDoIt = true;
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}
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} else {
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// Advance toIndex
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toIndex = advance(toIndex);
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hasMergedPrevious = false;
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}
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} else {
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fromIndex = advance(fromIndex);
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}
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}
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}
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return didIDoIt;
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}
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const canSlideInDirection = (grid, direction) => {
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const clonedGrid = grid.clone();
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return slideInDirection(clonedGrid, direction);
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}
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const gameIsLost = (grid) => {
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return !canSlideInDirection(grid, Direction.Up)
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&& !canSlideInDirection(grid, Direction.Right)
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&& !canSlideInDirection(grid, Direction.Down)
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&& !canSlideInDirection(grid, Direction.Left);
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}
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const checkForEnd = (grid) => {
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if (gameIsLost(grid)) {
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alert('A loser is you!');
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}
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}
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const makeDevGrid = (matrix) => {
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const numRows = matrix.length;
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const numColumns = matrix[0].length;
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const initialValue = makeTile(0, false, 0, 0);
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const grid = makeGrid(numRows, numColumns, initialValue);
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for (let rowIndex = 0; rowIndex < numRows; rowIndex++) {
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const row = matrix[rowIndex];
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for (let colIndex = 0; colIndex < numColumns; colIndex++) {
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const value = row[colIndex];
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const tile = grid.getTile(rowIndex, colIndex);
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tile.value = value;
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tile.visible = value > 0;
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}
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}
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return grid;
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}
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/*
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[0,0,0,0],
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[0,0,1,0],
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[0,0,0,0],
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[2,1,2,2],
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can't slide down.
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[0,0,1,0],
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[0,0,0,0],
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[0,0,0,0],
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[3,2,3,0],
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can't slide down.
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can't slide left.
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up()
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[1,0,1,0],
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[0,0,3,0],
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[0,0,0,0],
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[3,2,0,0], either the 3 doesn't go up or the 1 bounces it back?
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// fixed
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*/
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