Chrome/FF 中的 SVG 图案填充错位答案

【问题标题】：SVG pattern fill misalignment in Chrome/FFChrome/FF 中的 SVG 图案填充错位
【发布时间】：2015-10-01 06:54:28
【问题描述】：

我正在做一个地图项目，并使用 SVG 元素作为瓷砖，它们之间总是显示出接缝。如果我使用带有 css 属性“shape-rendering: crispEdges”的元素，我可以避免接缝。但是，当我尝试使用包含平铺图像的图案填充这些元素时，Chrome 和 FF 中的图案对齐存在一些不一致（我现在使用的是 Chrome 45 和 FF 41）。

我已在此 jsfiddle 中隔离了该问题。所有的变换、svg 大小、矩形大小等都直接来自我正在处理的项目，并且应该假设它们无法更改。我只能更改模式（或者如果元素有类似“shape-rendering: crispEdges”的属性/属性，我可以更改它）。

如何让图案平铺图像完全覆盖并正确对齐？

HTML

<!-- change background from white to black to see what's going on -->

<!-- The SVG is large. The <rect> can be located a bit to the right of the center of the SVG -->
<!-- When BG is black, you can see a white edge on the left and bottom -->
<!-- When BG is white, you can see a dark edge on the top and right -->
<body style="background: white;">
    <div style="position: fixed; x: 0; y: 0;">
        <button onclick="whiteBG()">White BG</button>
        <button onclick="blackBG()">Black BG</button>
    </div>
    <svg height="1965" version="1.1" width="5760" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
        <defs>
            <pattern x="0" y="0" width="100%" height="100%" patternContentUnits="objectBoundingBox" id="patternSieyywid32k">
                <!-- image is base64 encoded 415 x 512 image -->
                <image  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
                       x="0" y="0" width="1" height="1" preserveAspectRatio="none"></image>
            </pattern>
        </defs>
        <g transform="matrix(0.0049,0,0,0.0049,101.5334,3349.9742)" style="display: inline;">
            <rect x="641958.5514" y="-516667.078" width="28275.123699999996" height="32099.475199999986" fill="url('#patternSieyywid32k')" style="shape-rendering: crispEdges;"></rect>
        </g>
    </svg>
</body>

var whiteBG = function() {
    document.querySelector('body').style.background = '#FFF';
}

var blackBG = function() {
    document.querySelector('body').style.background = '#000';
}

【问题讨论】：

图像渲染：-moz-crisp-edges 对您有任何好处（当然在 Firefox 上）图像渲染：像素化可能适用于 Chrome。
您在这里所做的事情。您正在获取一个 451x512 位图并将其缩放到 138.548x157.287 像素，然后将其定位在 (3247.130,818.3055) 并希望它的像素完美。您可能需要考虑不同的方法。
我明白你在说什么，但我的印象是 css 属性“shape-rendering:crispEdges”导致 rect 元素基本上“对齐像素”，从而使其像素完美。看来这就是它在我的项目中所做的，因为接缝消失了。我假设如果矩形元素是完美的像素，则图案图像应该能够正确对齐。不过，我想它不会那样工作。感谢您的意见！

标签： svg

【解决方案1】：

对于这个问题，我能想到的最佳解决方案是重新使用图像元素，但我没有让浏览器处理转换，而是从组元素中删除了转换并使用一些 JS 代码来应用转换手动更新每个图像元素的 x、y、宽度和高度属性。这样做，我可以控制如何对结果进行四舍五入以实现像素完美的图块。

【讨论】：