返回到:Canvas API:CanvasRenderingContext2D
CanvasRenderingContext2D.direction 是 Canvas 2D API 用来在绘制文本时,描述当前文本方向的属性。
语法
ctx.direction = "ltr" || "rtl" || "inherit";选项
有效值:
ltr
文本方向从左向右。
rtl
文本方向从右向左。
inherit
根据情况继承 <canvas> 元素或者 Document 。
默认值是 inherit。
示例
使用direction 属性
这是一段简单的代码片段,对文本设置不同的 direction 数值。
HTML
<canvas id="canvas"></canvas>JavaScript
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.font = '48px serif';
ctx.fillText('Hi!', 150, 50);
ctx.direction = 'rtl';
ctx.fillText('Hi!', 150, 130);
看下DEMO:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CanvasRenderingContext2D.direction | Web176教程www.web176.com</title>
<meta name="robots" content="noindex, nofollow">
<style>
body {
padding: 0;
margin: 0;
}
svg:not(:root) {
display: block;
}
.playable-code {
background-color: #f4f7f8;
border: none;
border-left: 6px solid #558abb;
border-width: medium medium medium 6px;
color: #4d4e53;
height: 100px;
width: 90%;
padding: 10px 10px 0;
}
.playable-canvas {
border: 1px solid #4d4e53;
border-radius: 2px;
}
.playable-buttons {
text-align: right;
width: 90%;
padding: 5px 10px 5px 26px;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<canvas id="canvas" width="550" height="500"></canvas>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.font = '48px serif';
ctx.fillText('Hi!', 150, 50);
ctx.direction = 'rtl';
ctx.fillText('Hi!', 150, 130);
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.font = '48px serif';
ctx.fillText('Hi!', 150, 50);
ctx.direction = 'rtl';
ctx.fillText('Hi!', 150, 130);
</script>
</body>
</html>返回到:Canvas API:CanvasRenderingContext2D
作者:terry,如若转载,请注明出处:https://www.web176.com/canvas_api/7962.html
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