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