HTML 5 canvas textAlign ÊôÐÔ

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ÔÚλÖà 150 ´´½¨Ò»ÌõºìÏß¡£Î»Öà 150 ÊÇÏÂÃæÀý×ÓÖж¨ÒåµÄËùÓÐÎı¾µÄêµã¡£ÇëÑо¿Ã¿ÖÖ textAlign ÊôÐÔÖµµÄЧ¹û£º

Your browser does not support the canvas tag.

JavaScript:

var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");

// ÔÚλÖà 150 ´´½¨À¶Ïß
ctx.strokeStyle="blue";
ctx.moveTo(150,20);
ctx.lineTo(150,170);
ctx.stroke();

ctx.font="15px Arial";

// ÏÔʾ²»Í¬µÄ textAlign Öµ
ctx.textAlign="start";
ctx.fillText("textAlign=start",150,60);
ctx.textAlign="end";
ctx.fillText("textAlign=end",150,80);
ctx.textAlign="left";
ctx.fillText("textAlign=left",150,100);
ctx.textAlign="center";
ctx.fillText("textAlign=center",150,120);
ctx.textAlign="right";
ctx.fillText("textAlign=right",150,140);

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Internet Explorer 9¡¢Firefox¡¢Opera¡¢Chrome ÒÔ¼° Safari Ö§³Ö textAlign ÊôÐÔ¡£

×¢ÊÍ£ºInternet Explorer 8 ÒÔ¼°¸üÔçµÄ°æ±¾²»Ö§³Ö <canvas> ÔªËØ¡£

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textAlign ÊôÐÔ¸ù¾Ýêµã£¬ÉèÖûò·µ»ØÎı¾ÄÚÈݵĵ±Ç°¶ÔÆë·½Ê½¡£

ͨ³££¬Îı¾»á´ÓÖ¸¶¨Î»ÖÿªÊ¼£¬²»¹ý£¬Èç¹ûÄúÉèÖÃΪ textAlign="right" ²¢½«Îı¾·ÅÖõ½Î»Öà 150£¬ÄÇô»áÔÚλÖà 150 ½áÊø¡£

Ìáʾ£ºÊ¹Óà fillText() »ò strokeText() ·½·¨ÔÚʵ¼ÊµØÔÚ»­²¼ÉÏ»æÖƲ¢¶¨Î»Îı¾¡£

ĬÈÏÖµ£º start
JavaScript Óï·¨£º context.textAlign="center|end|left|right|start";

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start ĬÈÏ¡£Îı¾ÔÚÖ¸¶¨µÄλÖÿªÊ¼¡£
end Îı¾ÔÚÖ¸¶¨µÄλÖýáÊø¡£
center Îı¾µÄÖÐÐı»·ÅÖÃÔÚÖ¸¶¨µÄλÖá£
left Îı¾×ó¶ÔÆë¡£
right Îı¾ÓÒ¶ÔÆë¡£
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