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khrtz/render-canvas.html

Last active September 20, 2018 00:53
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文字列をCanvasで描画
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render-canvas.html
<!DOCTYPE html>
<html>
<head>
<title>canvas test</title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<style type="text/css">
body {
font-size: 100px;
}
.canvas {
height: 120px;
}
canvas {
/* image-rendering: pixelated; */
image-rendering: crisp-edges;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: antialiased;
background-color: #000;
}
</style>
</head>
<body>
<div class="canvas">あいうABC123][';/,@%$#</div>
<script type="text/javascript">
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', {
alpha: true,
depth: false,
antialias: true
}),
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 = '#fff';
tmpCanvas.fillText(text, 20, 20);
// tmpCanvas.lineJoin = 'miter';
// tmpCanvas.miterLimit = 1;
// tmpCanvas.stroke();
// tmpCanvas.restore();
console.log('tmpCanvas', tmpCanvas);
canvas.drawImage(tmpElement, 0, 0, textWidth, fontSize, x, y, textWidth/ratio, fontSize/ratio);
$tmpElement.remove();
};
$('.canvas').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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