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sprite.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
.colorselect {
display: inline-block;
width: 50px;
height: 50px;
cursor: pointer;
border: 1px solid black;
}
.colorselect.active {
border-color: red;
}
canvas, #output {
border: 1px solid black;
}
</style>
<script>
var color, colors = ['white', 'lightgrey', 'darkgrey', 'black'];
var tile = 64;
function decode(data) {
var result = [];
for(var y = 0; y < data.length / 2; y++) {
var row = [];
var one = data[y*2];
var two = data[y*2+1];
for(var i=7;i >= 0;i--) {
row[i] = (one&1) | ((two&1) << 1);
one = one >> 1;
two = two >> 1;
}
result.push(row);
}
return result;
}
function format(n) {
n = n.toString(16);
return n.length<2 ? '0x0'+n : '0x'+n;
}
function encode(data) {
var result = [];
for(var y in data) {
var one = 0;
var two = 0;
for(var x in data[y]) {
one = one << 1;
two = two << 1;
if(data[y][x]&1) one++;
if(data[y][x]&2) two++;
}
result.push(format(one));
result.push(format(two));
}
return result;
}
function draw(ctx, data) {
for(var y in data)
for(var x in data[y]) {
ctx.fillStyle = colors[data[y][x]];
ctx.fillRect(x*tile, y*tile, tile, tile);
}
}
function selectColor(c) {
color = c;
var elements = document.getElementsByClassName('colorselect');
for(var i = 0; i < elements.length; i++)
elements[i].className = i==c ? 'colorselect active' : 'colorselect';
}
</script>
</head>
<body>
<div id="colorpicker">
<div class="colorselect" style="background: white" onclick="selectColor(0)"></div>
<div class="colorselect" style="background: lightgrey" onclick="selectColor(1)"></div>
<div class="colorselect" style="background: darkgrey" onclick="selectColor(2)"></div>
<div class="colorselect" style="background: black" onclick="selectColor(3)"></div>
</div>
<canvas id="sprite" style="position: relative"></canvas>
<pre id="output"></pre>
<script>
var out = document.getElementById('output');
var canvas = document.getElementById('sprite');
var ctx = canvas.getContext("2d");
canvas.width = canvas.height = 8*tile;
var data = decode([
0x38,0x38,0x44,0x7C,0x83,0xFF,0x7C,0x00,
0x7C,0x08,0x7E,0x20,0x7C,0x1C,0x38,0x00
]);
selectColor(0);
draw(ctx, data);
canvas.onclick = function(evt) {
var x = (evt.layerX / tile) | 0;
var y = (evt.layerY / tile) | 0;
data[y][x] = color;
draw(ctx, data);
var raw = encode(data);
console.log(raw);
out.innerHTML = "unsigned char TileLabel[] = {\n\t";
for(var i =0; i < raw.length; i++) {
out.innerHTML += raw[i];
if(i<raw.length-1)
out.innerHTML += (i+1)%8 ? ", " : ",\n\t";
}
out.innerHTML += "\n};";
}
</script>
</body>
</html>