specCon18/chessboard_crosses_exercise
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Steven Carpenter 2024-08-15 12:28:24 -04:00
commit 9120e1dc5f
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LICENSE.txt Normal file
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Copyright (c) 2021 Kyle Simpson <getify@gmail.com>
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

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css/style.css Normal file
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#board {
border: 0.2rem solid #000;
width: min-content;
}
#board > div {
display: flex;
}
#board > div > div {
width: 2rem;
height: 2rem;
}
#board > div:nth-child(2n) > div:nth-child(2n+1),
#board > div:nth-child(2n+1) > div:nth-child(2n) {
background-color: #000;
}
#board > div > div.highlighted {
background-color: red !important;
}

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index.html Normal file
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<!DOCTYPE html>
<html>
<head>
<title>Chess Diagonals</title>
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<div id="board"></div>
<p>
<button type="button" id="clear-highlights-btn">clear diagonals</button>
</p>
<script type="module" src="js/app.js"></script>
</body>
</html>

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js/app.js Normal file
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import Chessboard from "./chessboard.js";
document.addEventListener("DOMContentLoaded",async function ready(){
var boardEl = document.getElementById("board");
var clearHighlightsBtn = document.getElementById("clear-highlights-btn");
Chessboard.draw(boardEl);
boardEl.addEventListener("click",onClickTile,false);
clearHighlightsBtn.addEventListener("click",clearHighlights,false);
// ********************************
function onClickTile(evt) {
var clickedEl = evt.target;
// clicked on a board tile?
if (clickedEl.matches("#board > div > div")) {
Chessboard.highlight(clickedEl);
}
else {
clearHighlights();
}
}
function clearHighlights() {
Chessboard.highlight();
}
});

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js/chessboard.js Normal file
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export default {
draw,
highlight
};
var diagonals = [];
var highlighted = [];;
var tileDiagonals = new Map();
function draw(boardEl) {
//instantiating the diagonals data structure
for (let i = 0; i < 30; i++){
diagonals.push([]);
}
for (let i = 0; i <= 7; i++) {
let rowEl = document.createElement("div");
for (let j = 0; j <= 7; j++) {
let tileEl = document.createElement("div");
rowEl.appendChild(tileEl);
let majorDiagIdx = diagonals[7 - (i-j)];
let minorDiagIdx = diagonals[15 + (i+j)];
majorDiagIdx.push(tileEl);
minorDiagIdx.push(tileEl);
tileDiagonals.set(tileEl,[majorDiagIdx,minorDiagIdx]);
}
boardEl.appendChild(rowEl);
}
}
function highlight(tileEl) {
// clear all currently highlighted tiles (if any)
for (let diag of highlighted) {
for (let el of diag){
el.classList.remove("highlighted");
}
}
// check if user clicked on a board tile.
if (tileEl) {
highlighted = tileDiagonals.get(tileEl);
for (let diag of highlighted) {
for (let el of diag){
el.classList.add("highlighted");
}
}
}
}