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<!DOCTYPE html>
<title>Explore the Torus</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
body {
color: white;
background-color: black;
text-align: center;
}
a { color: white; }
img {
max-width: 100%;
image-rendering: pixelated;
}
table { margin: auto; }
button.arr { font-size: 150%; }
</style>
<p>
A collaborative ASCII art project.
<p>
<a href="ssh://torus@ascii.town"><code>ssh torus@ascii.town</code></a>
<p>
<img id="tile" src="tile.png">
<table>
<tr>
<td rowspan="2">
<button id="larr" class="arr" type="button">←</button>
</td>
<td><button id="uarr" class="arr" type="button">↑</button></td>
<td rowspan="2">
<button id="rarr" class="arr" type="button">→</button>
</td>
</tr>
<tr>
<td><button id="darr" class="arr" type="button">↓</button></td>
</tr>
<tr>
<td colspan="3"><button id="home" type="button">HOME</button></td>
</tr>
</table>
<p>
This is AGPLv3 Free Software!
Code is available from
<a href="https://git.causal.agency/torus">Causal Agency</a>.
<script>
/* Copyright (C) 2019 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
let tile = document.getElementById("tile");
let larr = document.getElementById("larr");
let darr = document.getElementById("darr");
let uarr = document.getElementById("uarr");
let rarr = document.getElementById("rarr");
let state = new URLSearchParams();
function setImage() {
let url = new URL(tile.src);
url.search = "?" + state.toString();
tile.src = url.toString();
}
window.onhashchange = function() {
state = new URLSearchParams(document.location.hash.slice(1));
setImage();
}
window.onhashchange();
function setState(x, y) {
state.set("x", x);
state.set("y", y);
history.pushState(state.toString(), "", "#" + state.toString());
setImage();
}
function move(dx, dy) {
setState(+state.get("x") + dx, +state.get("y") + dy);
}
window.onpopstate = function(event) {
state = new URLSearchParams(event.state);
setImage();
}
home.onclick = () => setState(0, 0);
larr.onclick = () => move(-1, 0);
darr.onclick = () => move( 0, 1);
uarr.onclick = () => move( 0, -1);
rarr.onclick = () => move( 1, 0);
document.onkeydown = function(event) {
switch (event.key) {
case "Q": case "Home": home.onclick(); break;
case "h": case "ArrowLeft": larr.onclick(); break;
case "j": case "ArrowDown": darr.onclick(); break;
case "k": case "ArrowUp": uarr.onclick(); break;
case "l": case "ArrowRight": rarr.onclick(); break;
}
return false;
}
</script>
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