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<div style="text-align:center;background-color:#1e576b;width:100%;height:400px;">
<div>
<input type="text" id="dim_face" placeholder="dim"/>
<input type="button" id="submit_face" value="submit"/>
</div>
<div style="margin:1em"><canvas id="faceCanvas"></canvas></div>
</div>
<script src="https://code.jquery.com/jquery-1.8.3.js"></script>
<script type="text/javascript">
function drawFace(w, h) {
var w = w || 8;
var h = h || 8;
var border = 12;
var val = [];
for (var i = 0; i < h; i += 1) {
var str = [];
for (var j = 0; j < w / 2; j += 1) {
var rand = parseInt(Math.random() * 2);
str[j] = rand;
str[w - j] = rand;
}
val.push(str.join(""));
console.log(str.join(""));
}
var canvas=document.getElementById('faceCanvas');
var fillWidth = border * w;
var fillHeight = border * h;
$(canvas).attr("height", fillHeight + "px");
$(canvas).attr("width", fillWidth + "px");
var ctx=canvas.getContext('2d');
ctx.clearRect(0, 0, fillWidth, fillHeight);
for (var y = 0; y < h; y += 1) {
for (var x = 0; x < w; x += 1) {
ctx.fillStyle= val[y][x] == "1" ? '#000' : '#FFF';
console.log("x y v, %d %d %s", x, y, val[y][x]);
ctx.fillRect(x * border, y * border, border, border);
}
}
}
$(document).ready(function() {
drawFace();
$("#submit_face").click(function(){
var d = $("#dim_face").val();
drawFace(d, d);
});
});
</script>
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