解决Chrome中的非缩放中风错误
最近的一个Chrome版本(不确定的确切版本)打破了我的一些SVG,这样就会vector-effect:non-scaling-stroke渲染出色域错误的折线.我无法弄清楚是什么触发了这个bug.
var viewBoxen = {
good:"-55.91646158020719 -61.478141667102406 111.83292317296 122.95628333555779",
bad:"-55.92 -61.48 111.83 122.96"
};
var svg = document.querySelector('svg'),
span = document.querySelector('span');
var buttons = document.querySelectorAll('button');
for (var i=buttons.length;i--;) (function(btn){
var viewBox = viewBoxen[btn.id];
btn.onclick = function(){
span.innerHTML = viewBox;
svg.setAttribute('viewBox',viewBox);
}
})(buttons[i]);
buttons[1].click();svg { display:inline-block; width:200px; height:200px; border:1px solid red; margin:10px }
polyline { fill:none; stroke:black; stroke-width:1px; vector-effect:non-scaling-stroke }<svg xmlns="http://www.w3.org/2000/svg" viewBox="-55.92 -61.48 111.83 122.96">
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<polyline points="-55.92,-61.48 55.92,61.48"/>
</svg>
<p>viewBox="<span></span>"</p>
<p>
<button id="good">High Precision viewBox</button>
<button id="bad">Low Precision viewBox</button>
</p>进一步的例子/比较可以看到:
正如您在Stack Overflow上看到的那样运行片段,使用viewBox的高精度(14个小数位)按预期渲染折线,但是当我放下精度(2个小数位)时,折线的渲染会有所不同,得到大和别名.
如果您查看JSFiddle或我的网站上的比较,您可以看到高精度viewBox并不总能解决问题.
My question: can you help me isolate what is triggering this bug in Chrome, and (especially) figure out how to avoid it/work around it consistently?
Those wondering about the source of these images may be interested in http://phrogz.net/SVG/TurtleTest.html and http://phrogz.net/tmp/StarryTurtles.html