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HTML5画布文本包装教程

2014-01-01 19:43 525 查看

文字换行与HTML5画布,我们可以创建一个自定义函数,需要画布的背景下,一个文本字符串,一个位置,最大宽度和高度一致。功能应该使用measureText()方法画布的背景下一行应该包装时计算。

<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="578" height="200"></canvas>
<script>
function wrapText(context, text, x, y, maxWidth, lineHeight) {
var words = text.split(' ');
var line = '';

for(var n = 0; n < words.length; n++) {
var testLine = line + words
+ ' ';
var metrics = context.measureText(testLine);
var testWidth = metrics.width;
if (testWidth > maxWidth && n > 0) {
context.fillText(line, x, y);
line = words
+ ' ';
y += lineHeight;
}
else {
line = testLine;
}
}
context.fillText(line, x, y);
}

var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var maxWidth = 400;
var lineHeight = 25;
var x = (canvas.width - maxWidth) / 2;
var y = 60;
var text = 'All the world \'s a stage, and all the men and women merely players. They have their exits and their entrances; And one man in his time plays many parts.';

context.font = '16pt Calibri';
context.fillStyle = '#333';

wrapText(context, text, x, y, maxWidth, lineHeight);
</script>
</body>
</html>

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标签： HTML5画布文本包装教程

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