当使用带有transform：scale的CSS3阴影滤镜时，SVG像素化

Question

我正在显示带有内联SVG的世界地图，并希望在国家边界周围有一个漂亮，微妙的投影。我用CSS3 filter属性实现了这个：

#map.shadow g#world {
    -webkit-filter: drop-shadow(2px 2px 2px rgba(0,0,0,0.25));
    filter: drop-shadow(2px 2px 2px rgba(0,0,0,0.25));
}

这完全奏效......直到我需要能够缩放地图。我使用transform: scale()进行缩放（应用于容器，因为地图顶部有标记元素和垃圾），但这似乎是“bitmapize＆＃39;干净，清爽的SVG。如果我删除filter阴影，它会再次变得清脆。

我尝试过几种不同的方式应用阴影，包括SVG过滤器（根据this answer）＆amp;关于元素的translateZ(0)，但结果总是一样的 - 丑陋的，像素化的国家。供参考：

我假设这是因为filter: drop-shadow()值在px，因为我缩放了缩放的div（比如1.5 ，或150％），这也是缩放过滤器px ...但我不知道如何解决它（使用像em这样的关系单位或vh似乎没有什么区别。）

我用一个例子组成了jsFiddle（为了简洁起见，地图只包含格陵兰岛）。

知道如何在SVG上保留我的阴影和漂亮的边框？

编辑：根据要求，这里是一个片段：

＆＃13;

＆＃13;

var zoomLevel = 1;

$('#controls').on('click', '.zoombutton', function(e) {
    var zoomDelta = parseFloat($(this).attr('data-delta'));
    zoomLevel += zoomDelta;

    $('#map').css({'transform': 'scale(' + zoomLevel + ')'});
});

$('#controls').on('click', '.shadow', function(e) {
    $('#map').toggleClass('shadow');
});

＆＃13;

#controls {
    position: relative;
    z-index: 1;
}

#map.shadow g#world {
	-webkit-filter:	drop-shadow(2px 2px 2px rgba(0,0,0,0.25));
	filter:	drop-shadow(2px 2px 2px rgba(0,0,0,0.25));
}

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.2/jquery.min.js"></script>
<div id="controls">
    <button type="button" class="zoombutton" data-delta="0.25">+</button>
    <button type="button" class="zoombutton" data-delta="-0.25">-</button>
    <button type="button" class="shadow">Toggle shadow</button>
</div>

<div id="map" class="shadow">
	<svg xmlns="http://www.w3.org/2000/svg" width="1009" height="665" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0  1009 665" preserveAspectRatio="xMinYMin meet">
		<g id="world" class="shadow">
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		</g>
	</svg>
</div>

＆＃13;

＆＃13;

＆＃13;

Answer 1

一个选项包括不使用CSS来扩展div，而是使用SVGElement的transform属性：

var zoomLevel = 1;

$('#controls').on('click', '.zoombutton', function(e) {
    var zoomDelta = parseFloat($(this).attr('data-delta'));
    zoomLevel += zoomDelta;
    $('#map>svg').attr('transform', 'translate('+zoomLevel*-200+',0) scale('+zoomLevel+')');
});

$('#controls').on('click', '.shadow', function(e) {
    $('#map').toggleClass('shadow');
});

#controls {
    position: relative;
    z-index: 1;
}

#map.shadow g#world {
	-webkit-filter:	drop-shadow(2px 2px 2px rgba(0,0,0,0.25));
	filter:	drop-shadow(2px 2px 2px rgba(0,0,0,0.25));
}

<!--<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.2/jquery.min.js"></script>-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.0.2/jquery.min.js"></script>
<div id="controls">
    <button type="button" class="zoombutton" data-delta="0.25">+</button>
    <button type="button" class="zoombutton" data-delta="-0.25">-</button>
    <button type="button" class="shadow">Toggle shadow</button>
</div>

<div id="map" class="shadow">
	<svg xmlns="http://www.w3.org/2000/svg" width="1009" height="665" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0  1009 665" preserveAspectRatio="xMinYMin meet" currentScale="1">
		<g id="world" class="shadow">
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