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script.js
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script.js
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window.onload = function() {
var activeColor = 'white';
var activeChecker;
var shouldBeat = false;
//Black checkers placed
for (var i = 1; i < 4; i++) {
for (var j = 1; j < 9; j++) {
if (!((j - i) % 2 == 0)) {
var square = document.querySelector("tr.row_" + i + " > td.col_" + j);
square.innerHTML = '<div class="black" data-row=' + i + ' data-col=' + j + ' data-queen="false"></div>';
square.dataset.color = 'black';
}
}
}
//White checkers placed
for (var i = 6; i < 9; i++) {
for (var j = 1; j < 9; j++) {
if (!((j - i) % 2 == 0)) {
var square = document.querySelector("tr.row_" + i + " > td.col_" + j);
square.innerHTML = '<div class="white" data-row=' + i + ' data-col=' + j + ' data-queen="false"></div>';
square.dataset.color = 'white';
}
}
}
//Update the state of the board and checkers
function update() {
activeChecker = NaN;
for (var i = 1; i < 9; i++) {
for (var j = 1; j < 9; j++) {
if (!((j - i) % 2 == 0)) {
let square = document.querySelector("tr.row_" + i + " > td.col_" + j);
square.style.backgroundColor = '';
square.dataset.active = false;
square.dataset.canWalk = false;
if (square.dataset.color == 'white' || square.dataset.color == 'black') {
checker = square.childNodes[0];
checker.dataset.col = j;
checker.dataset.row = i;
}
}
}
}
}
//Check that the checker can beat the enemy checker on the specified diagonal
function checkToBeat(row, col, x, y, enemyColor, canWalkOption = true) {
var element = document.querySelector("tr.row_" + row + " > td.col_" + col);
var queen = element.children[0].dataset.queen == 'true';
var canBeat = false;
var wayLength = queen ? 8 : 2;
for (var i = 1; i < wayLength; i++) {
var square = document.querySelector("tr.row_" + (row + x * i) + " > td.col_" + (col + y * i));
if (0 < row + (x * i) && row + (x * i) < 9 && 0 < col + (y * i) && col + (y * i) < 9) {
if (square.dataset.color == enemyColor) {
square = document.querySelector("tr.row_" + (row + (x * (i + 1))) + " > td.col_" + (col + (y * (i + 1))));
if (0 < row + (x * (i + 1)) && row + (x * (i + 1)) < 9 && 0 < col + (y * (i + 1)) && col + (y * (i + 1)) < 9 && !square.dataset.color) {
if (canWalkOption) {
square.dataset.canWalk = true;
}
element.style.backgroundColor = 'green';
square.style.backgroundColor = 'green';
shouldBeat = true;
canBeat = true;
} else {
break;
}
} else if (square.dataset.color == activeColor) {
break;
} else if (canBeat && !square.dataset.color) {
if (canWalkOption) {
square.dataset.canWalk = true;
}
square.style.backgroundColor = 'green';
}
}
}
}
//Check that the checker can move along the indicated diagonal
function checkToMove(row, col, x, y) {
var element = document.querySelector("tr.row_" + row + " > td.col_" + col);
var queen = element.children[0].dataset.queen == 'true';
var wayLength = queen ? 8 : 2;
for (var i = 1; i < wayLength; i++) {
var square = document.querySelector("tr.row_" + (row + x * i) + " > td.col_" + (col + y * i));
if (0 < row + (x * i) && row + (x * i) < 9 && 0 < col + (y * i) && col + (y * i) < 9 && !square.dataset.color) {
square.dataset.canWalk = true;
element.style.backgroundColor = 'green';
square.style.backgroundColor = 'green';
element.dataset.active = true;
}
}
}
//Check that you need to make a beat for active color checkers
function checkToShouldBeat() {
var enemyColor = activeColor == 'white' ? 'black' : 'white';
for (var i = 1; i < 9; i++) {
for (var j = 1; j < 9; j++) {
var element = document.querySelector("tr.row_" + i + " > td.col_" + j);
if (element.dataset.color == activeColor) {
checkToBeat(i, j, -1, -1, enemyColor, false);
checkToBeat(i, j, -1, +1, enemyColor, false);
checkToBeat(i, j, +1, +1, enemyColor, false);
checkToBeat(i, j, +1, -1, enemyColor, false);
}
}
}
}
//Shows the possible moves for the selected checker
function showPossibleMoves(checker) {
var row = parseInt(checker.dataset.row);
var col = parseInt(checker.dataset.col);
var queen = checker.dataset.queen == 'true';
var enemyColor = activeColor == 'white' ? 'black' : 'white';
var element = document.querySelector("tr.row_" + row + " > td.col_" + col);
checkToBeat(row, col, -1, -1, enemyColor);
checkToBeat(row, col, -1, +1, enemyColor);
checkToBeat(row, col, +1, +1, enemyColor);
checkToBeat(row, col, +1, -1, enemyColor);
if (shouldBeat) {
activeChecker = element;
element.dataset.active = true;
} else {
if (element.dataset.color == activeColor) {
var queen = element.children[0].dataset.queen == 'true';
if (activeColor == 'white' || queen) {
checkToMove(row, col, -1, -1);
checkToMove(row, col, -1, +1);
}
if (activeColor == 'black' || queen) {
checkToMove(row, col, +1, +1);
checkToMove(row, col, +1, -1);
}
activeChecker = element;
}
}
}
//Remove the beaten checker from the board
function beat(x, y, x_before, y_before) {
count = x_before - x;
axis_x = x_before - x < 0 ? -1 : 1;
axis_y = y_before - y < 0 ? -1 : 1;
for (var i = 0; i < Math.abs(count) - 1; i++) {
x += axis_x;
y += axis_y;
console.log(x, y);
element = document.querySelector("tr.row_" + y + " > td.col_" + x);
element.innerHTML = '';
element.dataset.color = '';
}
}
//Move the checker
function move(element) {
element.innerHTML = activeChecker.innerHTML;
activeChecker.innerHTML = '';
activeChecker.dataset.color = '';
element.dataset.color = activeColor;
x_after = parseInt(element.children[0].dataset.col);
y_after = parseInt(element.children[0].dataset.row);
update();
x_before = parseInt(element.children[0].dataset.col);
y_before = parseInt(element.children[0].dataset.row);
if (element.dataset.color == "white" && y_before == 1) {
var checker = element.children[0];
checker.dataset.queen = true;
checker.style.backgroundColor = '#FFF8DC';
} else if (element.dataset.color == "black" && y_before == 8) {
var checker = element.children[0];
checker.dataset.queen = true;
checker.style.backgroundColor = '#2F4F4F';
}
if (shouldBeat) {
console.log('after');
console.log('x', x_after, 'y', y_after);
console.log('before');
console.log(x_before, y_before);
beat(x_after, y_after, x_before, y_before);
shouldBeat = false;
checkToShouldBeat();
if (!shouldBeat) {
activeColor = activeColor == 'white' ? 'black' : 'white';
}
} else {
activeColor = activeColor == 'white' ? 'black' : 'white';
}
update();
}
//Track the event of clicking on the checker on the board
document.querySelector('.checkers').addEventListener('click', function() {
if (event.target.className == activeColor) {
update();
showPossibleMoves(event.target);
} else if (event.target.dataset.canWalk == 'true') {
move(event.target);
checkToShouldBeat();
}
});
};