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comilab/CanvasFont.html

Last active January 7, 2017 13:53
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canvas要素を使って文字を綺麗に描画してみる
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CanvasFont.html
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<style type="text/css">
body {
font-size: 22px;
}
</style>
</head>
<body>
<div>新しい朝が来た希望の朝だ</div>
<div class="beautify">新しい朝が来た希望の朝だ</div>
<script type="text/javascript">
$(function() {
var drawText = function(canvas, x, y, text, fontSize, fontFamily) {
var ratio = 2,
fontSize = fontSize * ratio,
$tmpElement = $('<canvas></canvas>').attr('height', fontSize),
tmpElement = $tmpElement.get(0),
tmpCanvas = tmpElement.getContext('2d'),
font = fontSize + 'px ' + fontFamily,
textWidth;
tmpCanvas.font = font;
textWidth = tmpCanvas.measureText(text).width;
$tmpElement.attr('width', textWidth);
tmpCanvas.font = font;
tmpCanvas.textBaseline = 'top';
tmpCanvas.fillStyle = '#000';
tmpCanvas.fillText(text, 0, 0);
canvas.drawImage(tmpElement, 0, 0, textWidth, fontSize, x, y, textWidth/ratio, fontSize/ratio);
$tmpElement.remove();
};
$('.beautify').each(function() {
var $this = $(this),
$canvas = $('<canvas></canvas>').attr('width', $this.width()).attr('height', $this.height()),
context = $canvas.get(0).getContext('2d'),
fontSize = $this.css('font-size').replace('px', '');
drawText(context, 0, 0, $this.text(), fontSize, $this.css('font-family'));
$this.html($canvas);
});
});
</script>
</body>
</html>
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