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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Online Sprite Maker</title>
<script src="./node_modules/rxjs/bundles/Rx.min.js"></script>
<script src="./node_modules/highlightjs/highlight.pack.min.js"></script>
<link rel="stylesheet" href="./node_modules/highlightjs/styles/vs.css">
<style>
* {
margin: 0;
padding: 0;
}
body {
margin: 1em;
color: #666;
}
h1+p {
margin-top: 1em;
}
.button {
color: white;
padding: .8em 1.5em;
border-radius: .4em;
cursor: pointer;
box-shadow: 1px 1px 4px black;
transition: background 200ms, box-shadow 200ms;
}
.button:hover {
box-shadow: 2px 2px 8px black;
}
.button:active {
box-shadow: unset;
}
.button-bar {
overflow: hidden;
padding: 1em 0 0;
}
.button-bar>* {
margin: 0 2em 1em 0;
}
#fileSelectorLabel {
background: seagreen;
float: left;
}
#fileSelectorLabel:hover {
background: lightseagreen;
}
#fileSelector {
display: none;
}
#exportBtn,
#copyBtn {
visibility: hidden;
text-decoration: none;
background: coral;
float: left;
}
#exportBtn:hover,
#copyBtn:hover {
background: lightcoral;
}
#resultArea {
display: flex;
align-items: flex-start;
padding: 1em;
background: #e0e0e0;
border-radius: .5em;
}
#resultCss {
font-family: monospace;
vertical-align: top;
margin-left: 2em;
background: unset;
}
#hiddenArea {
position: absolute;
width: 1px;
height: 1px;
top: 0;
left: 0;
opacity: 0;
border: none;
outline: none;
}
</style>
</head>
<body>
<h1>Online Sprite Maker</h1>
<p>The image file name will be the output css class name.</p>
<div class="button-bar">
<label id="fileSelectorLabel" class="button">
Choose Images (Multiple)
<input id="fileSelector" type="file" accept=".gif,.jpg,.jpeg,.png,.bmp,.svg" onchange="generateSprite()" multiple>
</label>
<a id="exportBtn" class="button" download="compressed.png">Export Sprite Image</a>
<a id="copyBtn" class="button" onclick="copyResult()">Copy CSS</a>
</div>
<div id="resultArea">
<canvas id="canvas"></canvas>
<pre><code class="css" id="resultCss"></code></pre>
</div>
<textarea id="hiddenArea"></textarea>
<script>
let fileSelector = document.getElementById('fileSelector'),
fileReader = new FileReader(),
canvas = document.getElementById('canvas'),
context = canvas.getContext('2d'),
exportBtn = document.getElementById('exportBtn'),
copyCssBtn = document.getElementById('copyBtn'),
resultCss = document.getElementById('resultCss'),
hiddenArea = document.getElementById('hiddenArea');
function generateSprite() {
let files = Array.prototype.slice.call(fileSelector.files);
files.sort((a, b) => {
return a.name.toLowerCase() > b.name.toLowerCase() ? 1 : -1;
});
Rx.Observable.from(files)
.concatMap(file => Rx.Observable.create(observer => {
let img = document.createElement('img');
img.fileName = file.name.substring(0, file.name.lastIndexOf('.'));
fileReader.onload = e => {
img.src = e.target.result;
img.onload = () => {
observer.next(img);
observer.complete();
};
};
fileReader.readAsDataURL(file);
}))
.reduce((acc, img) => {
img.pos = {
x: 0,
y: 0
};
if (acc.images.length > 0) {
let lastImg = acc.images[acc.images.length - 1];
img.pos.y = lastImg.pos.y + lastImg.height;
}
acc.maxWidth = Math.max(img.width, acc.maxWidth);
acc.height += img.height;
acc.images.push(img);
return acc;
}, {
maxWidth: 0,
height: 0,
images: []
})
.subscribe(obj => renderCanvas(obj));
}
function renderCanvas(obj) {
canvas.width = obj.maxWidth;
canvas.height = obj.height;
context.clearRect(0, 0, canvas.width, canvas.height);
let htmls = [];
obj.images.forEach(img => {
htmls.push(`.${img.fileName} {
width: ${img.width}px;
height: ${img.height}px;
background-image: url(images/compressed.png);
background-position: ${-img.pos.x}px ${-img.pos.y}px;
}
`);
context.drawImage(img, img.pos.x, img.pos.y);
});
resultCss.innerHTML = htmls.join('');
hljs.highlightBlock(resultCss);
exportBtn.style.visibility = 'visible';
exportBtn.href = canvas.toDataURL('png');
copyCssBtn.style.visibility = 'visible';
}
function copyResult() {
hiddenArea.value = resultCss.innerText;
hiddenArea.focus();
hiddenArea.select();
document.execCommand('copy');
}
</script>
</body>
</html>