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Pixel World Editor.htm
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<!DOCTYPE html>
<html>
<head>
<title>Pixel World Editor</title>
<meta name="description" content="Draw worlds out of pixel art sprites.">
<meta name="og:type" content="website">
<meta name="og:title" content="Pixel World Editor">
<meta name="og:description" content="Draw worlds out of pixel art sprites.">
<style>
@keyframes fadeout {
0% { opacity: 1; }
100% { opacity: 0; }
}
a:link { color: #66C; }
a:visited { color: #C9D; }
.success {
margin: 0;
color: #3C3;
}
.fade-out {
animation: fadeout 4s;
}
/* Forms */
.fields, .actions {
padding: 8px;
}
label.wrap {
display: block;
margin: 0 0 1em;
}
textarea, input, select {
background: #444;
border: 1px solid #999;
font:inherit;
color: inherit;
}
textarea {
border-radius: 4px;
}
button, .button {
background: #444;
color: inherit;
border: 1px solid #000;
border-radius: 8px;
padding: 8px;
font-family: Arial, Helvetica, sans-serif;
font-size: 0.875em;
transition: background-color 0.4s;
-webkit-appearance: none;
appearance: none;
cursor: pointer;
vertical-align: middle;
}
button:hover, .button:hover {
background: #666;
}
button:active, .button:active {
transition: none;
background: #3399FF;
}
.error {
color: #F88;
}
.info-button {
background: #3377DD;
text-align: center;
width: 32px;
height: 32px;
line-height: 32px;
border-radius: 17px;
border: 1px solid #FFF;
font-weight: bold;
font-size: 1.25em;
padding: 0;
text-shadow: -1px 1px #000;
}
.info-button:hover {
background: #3399FF;
}
.library .info-button {
float: right;
}
/* Modal */
.modal {
position: absolute;
top: 20%;
left: 20%;
width: 60%;
background: #333;
border: 1px solid #000;
border-radius: 16px;
padding: 16px;
box-shadow: 6px 6px 10px #000;
overflow: auto;
}
.modal .close {
display: inline-block;
float: right;
width: 32px;
height: 32px;
font-size: 1em;
line-height: 32px;
text-align: center;
padding: 0;
}
.modal header {
font-weight: 700;
border-radius: 15px 15px 0 0;
background: #444;
margin: -16px -16px 0;
padding: 8px 16px;
}
.modal .body {
padding-top: 16px;
}
.modal textarea {
width: 100%;
height: 140px;
}
.modal .actions {
text-align: right;
}
.modal .actions button {
margin-left: 8px;
}
#message-modal {
left: 50%;
margin-left: -200px;
width: 400px;
}
/* Page layout and content */
html,body {
margin:0;
padding:0;
color: #FFF;
font-size: 16px;
font-family: Tahoma, sans-serif;
}
main {
display: flex;
width: 100vw;
height: 100vh;
align-items: stretch;
}
.sidebar {
flex: 0 0 auto;
background: #333;
height: 100%;
width: 320px;
}
#left-sidebar {
overflow: auto;
}
#world-area {
flex: 1 1 auto;
background: #222;
}
#world-area.grid {
background-image:
linear-gradient(to right, #555 0%, #555 1px, transparent 2px),
linear-gradient(to bottom, #555 0%, #555 1px, transparent 2px);
background-position: top left, top left;
background-size: 10px 10px;
}
#world {
display: block;
width: 100%;
height: 100%;
border: 0;
padding: 0;
margin: 0;
}
.sidebar section h3 {
background: #444;
padding: 8px 16px;
margin: 0;
font: inherit;
font-weight: 700;
}
#sprite-list,
#layers {
background: #222;
text-align: center;
overflow: auto;
padding: 8px 8px 0;
margin: 8px;
border: 1px solid #999;
max-height: 50vh;
}
.layer {
display: flex;
background: #444;
border: 1px solid #000;
padding: 4px;
margin: 0 0 8px;
align-items: center;
transition: background 0.25s;
position: relative;
}
.layer:hover {
background: #0D2842;
}
.layer.active {
border: 1px solid #3399FF;
}
.layer .field {
height: 24px;
background: #222;
border: 1px solid #999;
flex: 1 1 auto;
width: 100%;
display: none;
}
.layer .select {
border-radius: 10px;
flex: 1 1 auto;
line-height: 24px;
padding: 8px;
transition: background 0.25s;
cursor: pointer;
text-align: left;
}
.layer .rename,
.layer .delete {
width: 32px;
height: 32px;
line-height: 32px;
margin-left: 8px;
padding: 0;
border: 0;
text-align: center;
flex: 0 0 auto;
color: #FFF;
font-weight: bold;
font-size: 1.25em;
}
#layers[data-count="1"] .delete {
display: none;
}
.layer .delete:hover {
background: #803333;
}
.layer.edit .select {
display: none;
}
.layer.edit .field {
display: block;
}
.placeholder-layer {
height: 32px;
position: relative;
}
.layer.show-drop::before,
.placeholder-layer.show-drop::before {
content: "";
width: 100%;
height: 8px;
position: absolute;
top: -6px;
left: 0;
background: #3399FF;
border-radius: 4px;
}
#sprite-list {
padding: 8px;
text-align: left;
}
#sprite-list canvas,
.no-sprite {
display: inline-block;
vertical-align: middle;
margin-bottom: 8px;
image-rendering: pixelated;
border: 2px solid transparent;
transition: border 0.25s;
cursor: pointer;
height: 80px;
width: auto;
text-align: center;
}
.no-sprite {
width: 80px;
line-height: 80px;
background: #333;
}
.no-sprite span {
display: inline-block;
line-height: 1.142857;
vertical-align: middle;
}
.no-sprite:hover,
#sprite-list canvas:hover {
border-color: #555;
}
.no-sprite.selected,
#sprite-list canvas.selected {
border-color: #3399FF;
}
#export {
background: #3377DD;
transition: background 0.25s;
}
#export:hover {
background: #3399FF;
}
.help-locator {
position: relative;
width: 128px;
height: 0;
}
.help {
position: absolute;
top: 12px;
right: 0;
background: #444;
border: 1px solid #999;
padding: 12px 20px;
border-radius: 16px;
box-shadow: 0 0 12px #FFF;
width: 400px;
}
.help::before, .help::after {
content: "";
display: block;
position: absolute;
width: 0;
height: 0;
border-style: solid;
right: 48px;
top: -11px;
border-color: transparent transparent #999 transparent;
border-width: 0 11px 11px;
}
.help::after {
top: -10px;
border-color: transparent transparent #444 transparent;
border-width: 0 11px 11px;
}
.help p {
margin: 0;
}
.help .dismiss {
font-family: Arial,Helvetica,sans-serif;
font-weight: bold;
color: #39F;
text-decoration: underline;
float: right;
cursor: pointer;
}
.tool-info {
padding: 0 8px 8px;
font-size: 0.875em;
font-family: Arial,Helvetica,sans-serif;
opacity: 1;
max-height: 5em;
transition: max-height 0.25s, padding 0.25s;
overflow: hidden;
}
.tool-info.closed {
max-height: 0;
padding-bottom: 0;
}
.tool-info p {
margin: 0.25em 0;
}
.small-screen {
position: fixed;
top: 0;
left: 0;
width: 0;
height: 0;
overflow: hidden;
dsplay: none;
}
@media screen and (max-width:700px) {
.small-screen {
z-index: 8;
width: 100vw;
height: 100vh;
display: block;
background: rgba(51, 51, 51, 0.8);
}
.small-screen p {
position: absolute;
width: 90%;
top: 50%;
left: 5%;
transform: translateY(-50%);
color: #FFF;
font-size: 2em;
text-align: center;
}
}
.file-dialog {
width: 1px;
height: 1px;
overflow: hidden;
position: fixed;
bottom: 0;
left: 0;
}
</style>
</head>
<body>
<main>
<div class="small-screen">
<p>Your viewport must be at least 700px wide to use this application</p>
</div>
<div id="left-sidebar" class="sidebar">
<section class="file">
<h3>File</h3>
<div class="actions">
<button id="save">Save...</button>
<button id="load">Load...</button>
<button id="export">Export as HTML...</button>
</div>
<div class="file-dialog">
<input type="file" id="load-file">
</div>
<div class="actions">
<label class="wrap">
<input type="checkbox" id="autosave" checked>
Autosave on every action
</label>
<button id="clear-autosave">Clear autosaved data</button>
</div>
</section>
<section class="world">
<h3>World</h3>
<div class="fields">
<label class="wrap">
Background:
<input type="color" id="background-color" value="#222222">
</label>
<label class="wrap">
<input type="checkbox" id="show-grid" checked>
Show grid
</label>
<label class="wrap">
Pixel size:
<input type="number" min="1" step="1" value="10" id="pixel-size">px
</label>
</div>
</section>
<section class="layers">
<h3>Layers</h3>
<div class="actions">
<button id="add-layer"> + New layer</button>
</div>
<div id="layers">
<div class="placeholder-layer"></div>
</div>
</section>
</div>
<div id="world-area" class="grid">
</div>
<div id="right-sidebar" class="sidebar">
<section class="library">
<h3>Library</h3>
<div class="tools">
</div>
<div class="actions">
<button id="open-import-window">Import pixel art...</button>
<button id="delete-sprite">Delete selected</button>
<button class="info-button" id="show-info">?</button>
</div>
<div class="tool-info closed">
<p>Click on one of the imported sprites listed below to begin placing copies in the world.</p>
<p>Select "Move placed sprites" to drag existing sprites around.</p>
<p>Press the "Delete" button below or the "Delete" key on your keyboard to delete the selected sprite.</p>
</div>
<script src="https://unpkg.com/twemoji@latest/dist/twemoji.min.js" crossorigin="anonymous"></script>
<script>
document.getElementById("show-info").addEventListener("click", e => {
document.querySelector(".tool-info").classList.toggle("closed");
});
</script>
<div class="help-locator">
<div class="help">
<p>
This is an experimental editor, so I haven't built a pixel art creator.
For now, you can import pixel art made with
<a target="_blank" href="https://www.pixelartcss.com/">https://www.pixelartcss.com/</a>
using this button.
</p>
<label>
<input type="checkbox" id="dont-show" checked>
Don't show this again
</label>
<span class="dismiss">DISMISS</span>
</div>
</div>
<script src="https://unpkg.com/twemoji@latest/dist/twemoji.min.js" crossorigin="anonymous"></script>
<script>
(function(){
// Remove help box when clicking outside or on the dismiss button
// This doesn't work when clicking in the iframe, but it's OK. The user can
// click the "dismiss" button
let help = document.querySelector(".help");
if(localStorage.getItem("hideHelp")) {
help.remove();
} else {
let hide = () => {
if(document.getElementById("dont-show")) {
localStorage.setItem("hideHelp", true);
}
help.remove();
document.body.removeEventListener("click", checkHideHelp);
};
let checkHideHelp = e => {
let el = e.target;
while(el != document.body && el != help) el = el.parentNode;
if(el != help) hide();
};
document.body.addEventListener("click", checkHideHelp);
help.addEventListener( "click", e => { if(e.target.classList == "dismiss") hide(); });
}
})();
</script>
<div id="sprite-list">
<a class="no-sprite selected"><span>Move placed sprites</span></a>
</div>
</section>
</div>
<div id="import-modal" class="modal" style="display:none">
<header>
Import
<button class="close">×</button>
</header>
<div class="body">
<label for="pixelart-css-code">Create pixel art at <a target="blank" href="https://www.pixelartcss.com/">https://www.pixelartcss.com/</a> and paste the generated CSS here</label>
<textarea id="pixelart-css-code"></textarea>
<div id="import-errors" class="error" style="display: none">
<p>Unable to parse the CSS. The following errors were found:</p>
<ul></ul>
</div>
<div class="actions">
<button id="import-pixelart">Import</button>
</div>
</div>
</div>
<div id="message-modal" class="modal" style="display:none">
<header><span class="header-text"></span><button class="close">×</button></header>
<div class="body"></div>
</div>
</main>
<script src="https://unpkg.com/twemoji@latest/dist/twemoji.min.js" crossorigin="anonymous"></script>
<script>
document.getElementById("message-modal").addEventListener("click", e => e.currentTarget.style.display = "none" );
function showModal(title, text, acceptAction, cancelAction) {
let modal = document.getElementById("message-modal");
modal.querySelector(".header-text").innerHTML = title;
modal.querySelector(".body").innerHTML = text;
modal.style.display = "";
if(acceptAction || cancelAction) {
let buttons = document.createElement("div");
buttons.className = "actions";
let accept = document.createElement("button");
let cancel = document.createElement("button");
accept.innerHTML = "Accept";
cancel.innerHTML = "Cancel";
buttons.appendChild(accept);
buttons.appendChild(cancel);
modal.querySelector(".body").appendChild(buttons);
accept.addEventListener("click", e => { e.stopPropagation(); if(acceptAction) acceptAction(); modal.style.display = "none"; } );
cancel.addEventListener("click", e => { e.stopPropagation(); if(cancelAction) cancelAction(); modal.style.display = "none"; } );
}
}
</script>
<script id="internal-stylesheet" type="text/css">
html,body {
margin: 0; padding: 0;
min-height: 100vh;
min-width: 100vw;
}
.layer {
position: absolute;
top: 0;
left: 0;
}
.s, #placeholder {
position: absolute;
}
.s::before {
content: "";
display: block;
position: absolute;
top: 100%;
left: 100%;
}
.edit .s:hover::before {
border: 2px solid #3399FF;
}
</script>
<script src="https://unpkg.com/twemoji@latest/dist/twemoji.min.js" crossorigin="anonymous"></script>
<script>
/**
* Represents data for a unique sprite.
*/
class Sprite {
constructor(w, h) {
this.id = -1;
this.width = w;
this.height = h;
this.data = new Uint8ClampedArray(w*h*4);
}
}
/**
* Represents a sprite placed in the world
*/
class SpriteInstance {
static counter = 0;
constructor(sprite, x, y, id) {
if(typeof id === "undefined") {
this.id = SpriteInstance.counter++;
} else {
this.id = id;
if(SpriteInstance.counter <= id) {
SpriteInstance.counter = id + 1;
}
}
this.sprite = sprite;
this.x = x;
this.y = y;
}
}
/**
* Sprite layers allow the user to choose the visual order of sprites.
*/
class Layer {
static counter = 0;
constructor(name, id) {
if(typeof id === "undefined") {
this.id = Layer.counter++;
} else {
this.id = id;
if(Layer.counter <= id) {
Layer.counter = id + 1;
}
}
this.name = name;
this.sprites = [];
}
getInstanceById(id) {
let len = this.sprites.length;
for(let i = 0; i < len; i++) {
let sprite = this.sprites[i];
if(sprite.id == id) {
return sprite;
}
}
return null;
}
}
/**
* Converts between sprites and CSS.
*/
class CSSInterface {
/* Get sprites from user CSS input */
getSpritesFromCSS(css, errors) {
// Generate a <Style> tag so that the browser will give me CSS info
let style = document.createElement("style");
style.innerHTML = css;
style.media = "none";
document.head.appendChild(style);
// Loop through rules and compile a list of sprites sprites
let rules = style.sheet.cssRules;
let sprites = [];
for(let i = 0; i < rules.length; i++) {
let rule = rules[i];
let errList = [];
// Ignore @media, @keyframes and such for now
if(rule.constructor.name !== "CSSStyleRule") {
continue;
}
// Rules:
// - Animation not supported
// - width, height and box-shadow properties must exist.
if(rule.style["animation"]) {
errList.push("Animated sprites are not yet supported.");
}
if(!rule.style["width"]) {
errList.push("Missing width property");
}
if(!rule.style["height"]) {
errList.push("Missing height property");
}
if(!rule.style["box-shadow"]) {
errList.push("Missing box-shadow property");
}
if(errList.length == 0) {
// If no errors, send data to the sprite generator
try {
sprites.push(this.generateSprite(rule));
} catch(e) {
errList.push(e);
errors[rule.selectorText] = errList;
}
} else {
errors[rule.selectorText] = errList;
}
}
// Remove the temporary <style> tag
style.remove();
// Return the generated sprites
return sprites;
}
/* Generate CSS for a sprite */
getCSSFromSprite(sprite, size) {
let data = sprite.data;
let len = data.length;
let css = "";
let selector = ".s" + String(sprite.id);
css += selector + " {\n";
css += "width:" + String(size) + "px;\n";
css += "height:" + String(size) + "px;\n";
css += "box-shadow: ";
for(let i = 0; i < len; ) {
if(i > 0) css += ", ";
let k = i/4;
let r = data[i]; i++;
let g = data[i]; i++;
let b = data[i]; i++;
let a = data[i] / 255; i++;
let x = size * (1 + k % sprite.width);
let y = size * (1 + Math.floor(k / sprite.width));
css += `rgba(${r}, ${g}, ${b}, ${a.toFixed(2)}) ${x}px ${y}px`;
}
css += ";\n";
css += "}\n";
css += selector + "::before {\n";
css += "width:" + String(sprite.width * size) + "px;\n";
css += "height:" + String(sprite.height * size) + "px;\n";
css += "}";
return css;
}
/* Create a sprite from a valid CSS rule object */
generateSprite(rule) {
// Compile data
let w = parseInt(rule.style["width"]);
let h = parseInt(rule.style["height"]);
let cssData = rule.style["box-shadow"];
let unit = rule.style["width"].replace(/\d/g, "");
let parser = new ShadowParser(cssData, unit);
let pixel = null;
let cw = 0, ch = 0;
// Because no width or height of the drawing area is provided in the CSS, we
// have to run through the data and calculate it.
// Once we know the width and height, we can know what size to give the
// pixel data array.
// One run to get the sprite dimensions
while( pixel = parser.getNext()) {
let x = pixel.x / w;
let y = pixel.y / h;
if(x >= cw) cw = x;
if(y > ch) ch = y;
}
// One run to store the pixels in the sprite
let sprite = new Sprite(cw, ch);
parser.reset();
while( pixel = parser.getNext()) {
let x = -1 + pixel.x / w;
let y = -1 + pixel.y / h;
let color = pixel.color;
let pos = 4 * (y * cw + x);
sprite.data[pos ] = color[0];
sprite.data[pos+1] = color[1];
sprite.data[pos+2] = color[2];
sprite.data[pos+3] = color[3];
}
// Return the sprite
return sprite;
}
}
/**
* Special parser for box-shadow syntax.
*/
class ShadowParser {
static WHITESPACE = 1;
static NUMBER = 2;
static COLOR = 3;
static COMMA = 4;
static END = 5;
/* Initialize the parser */
constructor(text, unit) {
this.text = text;
this.pointer = 0;
this.unit = unit;
this.c = "";
if(text.length > 0) {
this.c = text[0];
}
}
/* Reset the parser so it can start parsing from the beginning */
reset() {
this.pointer = 0;
this.c = "";
if(this.text.length > 0) {
this.c = this.text[0];
}
}
/* Get data about the next pixel in the box-shadow rule */
getNext() {
let color = null, numbers = [];
let token, data = { value : -1 };
// Get first token
token = this.getToken(data);
// Skip whitespace
if(data.type == ShadowParser.WHITESPACE) {
token = this.getToken(data);
}
// If end of file, return null.
if(data.type == ShadowParser.END) {
return null;
}
// if starting with a color
if(data.type == ShadowParser.COLOR) {
color = token;
token = this.getToken(data);
if(data.type == ShadowParser.WHITESPACE) {
token = this.getToken(data);
}
}
// List of up to four numbers
while(data.type == ShadowParser.NUMBER) {
if(numbers.length >= 4) {
if(color) {
throw "(" + String(this.pointer) + ") Unexpected number, expecting comma or end-of-string.";
} else {
throw "(" + String(this.pointer) + ") Unexpected number, expecting color.";
}
}
let value = parseInt(token);
if(data.unit != this.unit) {
throw "(" + String(this.pointer) + ") Unexpected unit \"" + data.unit + "\", expected \"" + this.unit + "\". The box-shadow units must match the width property units.";
}
numbers.push(value);
// Next token
token = this.getToken(data);
// Skip whitespace
if(data.type == ShadowParser.WHITESPACE) {
token = this.getToken(data);
}
}
if(numbers.length < 2) {
throw "(" + String(this.pointer) + ") Expecting at least 2 numeric values, found \"" + String(numbers.length) + "\".";
}
// If ending with a color
if(!color) {
if(data.type == ShadowParser.COLOR) {
color = token;
if(data.type == ShadowParser.WHITESPACE) {
token = this.getToken(data);
}
}
}
// Expecting a comma or end of document
if(data.type != ShadowParser.COMMA && data.type != ShadowParser.END) {
throw "(" + String(this.pointer) + ") Unexpected \"" + this.c + "\", expecting comma or end-of-string";
}
return {
color : color,
x : parseInt(numbers[0]),
y : parseInt(numbers[1])
};
}
/* Find the next token */
getToken(data) {
data.unit = "";
if(this.c == ",") {
data.type = ShadowParser.COMMA
this.next()
return this.c;
} else if(this.c == "r") {
data.type = ShadowParser.COLOR;
return this.parseColor();
} else if(/[\s\t\r\n]/.test(this.c)) {
data.type = ShadowParser.WHITESPACE;
return this.parseWhitespace();
} else if(/\d/.test(this.c)) {
let info = {};
data.type = ShadowParser.NUMBER;
let value = this.parseNumber(info);
data.unit = info.unit;
return value;
} else if(this.c == "") {
data.type = ShadowParser.END;
} else {
throw "(" + String(this.pointer) + ") Unexpected character \"" + this.c + "\"";
}
}
/* Run through all whitespace until we hit a different character */
parseWhitespace() {
let out = "";
while(/[\s\n\r\t]/.test(this.c)) {
out += this.c;
this.next();
}
return out;
}
/* Retrieve a number */
parseNumber(data) {
if(!data) data = {};
let out = "";
data.unit = "";
while(/\d/.test(this.c)) {
out += this.c;
this.next();
}
while(/[a-zA-Z%]/.test(this.c)) {
data.unit += this.c;
out += this.c;
this.next();
}
if(out.length == 0) {
throw "(" + String(this.pointer) + ") Unexpected \"" + this.c + "\", expecting number.";
}
return out;
}
/* Retrieve a color in rgb() or rgba() format */
parseColor() {
let type = this.c;
this.next();
type += this.c;
if(this.c == "g") {
this.next();
type += this.c;
} else {
throw "(" + String(this.pointer) + ") Unexpected color format: \"" + type + "\"";
}
if(this.c == "b") {
this.next();
} else {
throw "(" + String(this.pointer) + ") Unexpected color format: \"" + type + "\"";
}
if(this.c != "(") {
type += this.c;
}