I am trying to create some ornate page dividers using SVGs with a fill pattern using the same image as the containing element's background image but I am having difficulty getting the SVG pattern to match the repeated background image of the containing element. I found a few similar questions on StackOverflow which mentioned using preserveAspectRatio but none of the solutions I've found are creating the desired effect.
Here's what my SVG code looks like:
<svg id="Layer_1" class="divider" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1400 150" >
<defs>
<pattern id="imgpattern" patternUnits="userSpaceOnUse" width="576" height="576" preserveAspectRatio="xMinYMin slice">
<image width="576" height="576" xlink:href="http://s12.postimg.org/730a258rx/pattern2.jpg"/>
</pattern>
<filter id="dropshadow" height="130%">
<feGaussianBlur in="SourceAlpha" stdDeviation="3"/>
<feOffset dx="0" dy="2" result="offsetblur"/>
<feMerge>
<feMergeNode/>
<feMergeNode in="SourceGraphic"/>
</feMerge>
</filter>
</defs>
<path d="M-394.09,367.9V295.34l1400,0v70s-3.39.9-4.92,1.38c-56.68,17.79-114.85,25.72-174.22,26.17-36.9.27-73.6-2.7-110.25-6.28q-67.4-6.59-134.7-14.08c-49.65-5.51-99.28-8.74-149-1.64-35.12,5-68.54,15.05-99.24,33.08-6,3.53-12.09,7-18.13,10.48-8.94,5.18-17.93,5.51-27,.36-3.47-2-7.14-3.6-10.51-5.71-48.22-30.22-101-43.79-157.83-41.84-29.13,1-58.27,2.45-87.3,4.94-40.49,3.48-80.88,8.18-121.32,12.27-24.37,2.46-48.71,5.26-73.14,7a714.52,714.52,0,0,1-96.42.34,605.73,605.73,0,0,1-96.81-13.9C-368.07,374.88-394.09,367.9-394.09,367.9Z" transform="translate(394.09 -295.32)" stroke="none" fill="url(#imgpattern)" filter="url(#dropshadow)" />
</svg>
And here's a JSFiddle which recreates my issue. Notice how the background pattern of the SVG appears more stretched and because of that does not completely match the repeated background image of the container.
One option is just to move the pattern fill into the filter like so - although there is a small problem that your texture has a one pixel black border, so the tiling isn't perfect.
<filter id="dropshadowandfill" height="130%" >
<feImage x="0" y="0" width="575" height="575" xlink:href="http://s12.postimg.org/730a258rx/pattern2.jpg"></feImage>
<feTile/>
<feComposite operator="in" in2="SourceGraphic" result="filledOriginal"/>
<feGaussianBlur in="SourceAlpha" stdDeviation="3"/>
<feOffset dx="0" dy="2" result="offsetblur"/>
<feMerge>
<feMergeNode/>
<feMergeNode in="filledOriginal"/>
</feMerge>
</filter>
</defs>
<path d="M-394.09,367.9V295.34l1400,0v70s-3.39.9-4.92,1.38c-56.68,17.79-114.85,25.72-174.22,26.17-36.9.27-73.6-2.7-110.25-6.28q-67.4-6.59-134.7-14.08c-49.65-5.51-99.28-8.74-149-1.64-35.12,5-68.54,15.05-99.24,33.08-6,3.53-12.09,7-18.13,10.48-8.94,5.18-17.93,5.51-27,.36-3.47-2-7.14-3.6-10.51-5.71-48.22-30.22-101-43.79-157.83-41.84-29.13,1-58.27,2.45-87.3,4.94-40.49,3.48-80.88,8.18-121.32,12.27-24.37,2.46-48.71,5.26-73.14,7a714.52,714.52,0,0,1-96.42.34,605.73,605.73,0,0,1-96.81-13.9C-368.07,374.88-394.09,367.9-394.09,367.9Z" transform="translate(394.09 -295.32)" stroke="none" filter="url(#dropshadowandfill)" />
Related
I am trying to apply a Vignette effect on images with SVG filters. I am trying to implement this with the <fePointLight> primitive, but I find this a bit limited in that it is always has a circular shape. Is it possible to change the width such that the lighting effect takes on a wide elliptical shape? This is currently the filter I am using:
<filter id="vignette">
<feFlood id="flood-5" result="blackfield-6" x="0%" y="0%" width="100%" height="100%" flood-color="#000000" flood-opacity="1"/>
<feSpecularLighting id="specular-5" result="Spotlight-6" lighting-color="#FFFFFF" surfaceScale="1" specularConstant="1" specularExponent="100">
<fePointLight id="pointlight-5" x="720" y="450" z="1200"/>
</feSpecularLighting>
<feBlend id="svg-7" result="A-6" in="blackfield-6" in2="Spotlight-6" mode="lighten"/>
<feBlend id="blend-5" result="B-6" in="A-6" in2="SourceGraphic" mode="multiply"/>
</filter>
I am aware that it is possible to do this with a radial gradient effect on a separate shape, but I have a requirement that it must be done purely using SVG filters.
The values of the x=350 and y=240 attributes of the fePointLight filter are chosen so that the point is in the center of the image.
Different values for the z attribute of the fePointLight filter render the light source at different depths in relation to the drawing. The nearest position corresponds to the largest size.
Please watch in full screen
Hover over image
#img {
width:700px;
height:481px;
}
#img:hover {
filter:url(#spotlight);
}
<img id="img" src="https://i.stack.imgur.com/mBuDo.jpg" >
<svg width="700" height="481" viewBox="0 0 700 481" xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink">
<defs>
<filter id="spotlight">
<feSpecularLighting result="spotlight" specularConstant="3.5"
specularExponent="70" lighting-color="grey">
<fePointLight x="350" y="240" z="520"/>
</feSpecularLighting>
<feComposite in="SourceGraphic" in2="spotlight" operator="in"/>
</filter>
</defs>
</svg>
Other image
#img {
width:700px;
height:481px;
}
#img:hover {
filter:url(#spotlight);
}
<img id="img" src="https://i.stack.imgur.com/GlhkD.jpg" >
<svg width="700" height="481" viewBox="0 0 700 481" xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink">
<defs>
<filter id="spotlight">
<feSpecularLighting result="spotlight" specularConstant="3.5"
specularExponent="70" lighting-color="grey">
<fePointLight x="350" y="240" z="520"/>
</feSpecularLighting>
<feComposite in="SourceGraphic" in2="spotlight" operator="in"/>
</filter>
</defs>
If you want that sort of effect (elliptical light), you probably want to be using a spotlight rather than a point light.
If you offset the light position to one side and shine the cone down at a shallow-ish angle, you will get an elliptical spot.
<svg width="600" height="529">
<defs>
<filter id="spotlight">
<feSpecularLighting result="spotlight" specularConstant="1.5"
specularExponent="4" lighting-color="#FFF">
<feSpotLight x="-200" y="265" z="400" limitingConeAngle="10" pointsAtX="300" pointsAtY="265" />
</feSpecularLighting>
<feComposite in="SourceGraphic" in2="spotlight" operator="out" k1="0" k2="1" k3="1" k4="0"/>
</filter>
</defs>
<rect x="0" y="0" width="600" height="529" style="fill: skyblue; filter:url(#spotlight);"/>
</svg>
Note that the lighting filter components can be unreliable to use. Each browser has differences in interpretation of the standard. Not to mention some bugs.
A point in case is the above example, which looks different in Firefox and Chrome.
But good luck with your project.
Is it possible to render a border of a SVG rect to emulate an outset?
with CSS?
with filters?
NB: It has to be a single scalable simple rect object, so I don't want to build it with paths / composite objects.
It's possible to do this with a filter. You do it by drawing a masking shape in the SVG and doing the stroking in the filter.
<svg width="600px" height="800px" color-interpolation-filters="sRGB">
<filter id="rect-and-stroke" x="0%" y="0%" width="100%" height="100%">
<feFlood flood-color="red" result="red-stroke"/>
<feFlood flood-color="orange" result="orange-stroke"/>
<feFlood x="10" y="10" width="180" height="80" flood-color="yellow" result="yellow-field"/>
<feComposite operator="in" in2="SourceGraphic" in="red-stroke" result="red-partial"/>
<feComposite operator="out" in2="SourceGraphic" in="orange-stroke" result="orange-partial"/>
<feMerge>
<feMergeNode in="red-partial" />
<feMergeNode in="orange-partial" />
<feMergeNode in="yellow-field" />
</feMerge>
</filter>
<path filter="url(#rect-and-stroke)" fill="black" d="M 0 0 L 10 10 180 80 200 100 0 100Z"/>
</svg>
I've created an SVG filter and applied it to some text. When I scale the text smaller by resizing the browser window, some of the edges of the text have a colored line down one side.
<svg
class="tstx" viewBox="0 0 160 160"
height="160" width="160"
style="width: 100%; height: 100%">
<defs>
<filter id="innershadow" x0="-50%" y0="-50%" width="200%" height="200%">
<feGaussianBlur in="SourceAlpha" stdDeviation="2" result="blur"/>
<feOffset dy="3" dx="3"/>
<feComposite in2="SourceAlpha" operator="arithmetic"
k2="-1" k3="1" result="shadowDiff"/>
<feFlood flood-color="grey" flood-opacity="1"/>
<feComposite in2="shadowDiff" operator="in"/>
<feComposite in2="SourceGraphic" operator="over"/>
</filter>
</defs>
<g
font-family="Verdana" font-size="80" font-weight="bold"
stroke="none" fill="#fff" filter="url(#innershadow)">
<text x="10" y="70">A</text>
<text x="80" y="70">B</text>
</g>
</svg>
How can I fix this?
Codepen Example
Move the middle margin right to scale text.
EDIT: It looks like I may have fixed the problem - I just don't know why it worked or if it will cause problems later on. I removed the following:
<feComposite in2="SourceGraphic" operator="over"/>
And the lines disappeared. Is anyone able to explain why?
I want to create rectangle with smoothed border. Important part that size of it's solid part should be certain. To clarify I'll give an example:
I can achieve desired effect with Gaussian filter:
<svg id="svg-root" width="800" height="600"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="test-body-content">
<defs>
<filter id="blur" filterUnits="userSpaceOnUse">
<feGaussianBlur in="SourceGraphic" stdDeviation="10" result="blur" />
<feMerge>
<feMergeNode in="blur" />
</feMerge>
</filter>
</defs>
<rect x="50" y="50" width="200" height="100" fill="black" filter="url(#blur)"/>
</g>
</svg>
Result:
But it doesn't meet requirements because it is not fully solid within given dimensions (width="200" height="100"):
Also I thought about applying gradient perpendicular to stroke, but SVG doesn't support such thing.
As #ABFORCE wrote you can provide the width and height you want via the filter element.
For example:
<filter id="blur" filterUnits="objectBoundingBox"
x="0" y="0" width="100%" height="100%">
...
</filter>
Note that this means that above filter will be clipped to the boundingbox of the filtered element.
If you want the original shape in the filter output you could add another feMergeNode like this:
<svg id="svg-root" width="800" height="600"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="test-body-content">
<defs>
<filter id="blur" filterUnits="userSpaceOnUse">
<feGaussianBlur in="SourceGraphic" stdDeviation="10" result="blur" />
<feMerge>
<feMergeNode in="blur" />
<feMergeNode in="SourceGraphic"/>
</feMerge>
</filter>
</defs>
<rect x="50" y="50" width="200" height="100" fill="black" filter="url(#blur)"/>
</g>
</svg>
Live example.
I'm using the "offset everything by half a pixel" trick discussed in the second answer to this question to get a crisp 1px stroke on a shape.
(There are rounded edges involved, so the shape-rendering: crispEdges solution isn't viable here -- it makes the curved parts of strokes look terrible.)
How come adding a filter (I'm using a gaussian blur + offset filter to implement a drop shadow) breaks the half-pixel offset hack?
You can play with the jsfiddle.
<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<defs>
<filter id="f1" x="-20%" y="-20%" width="160%" height="160%">
<feOffset result="offOut" in="SourceAlpha" dx="10" dy="10" />
<feGaussianBlur result="blurOut" in="offOut" stdDeviation="2" />
<feBlend in="SourceGraphic" in2="blurOut" mode="normal" />
</filter>
</defs>
<g transform="translate(5.5,5.5)">
<!-- This one has a blurry stroke -->
<rect width="50" height="50" rx="5" ry="5" stroke="black" stroke-width="1" fill="steelblue" filter="url(#f1)" />
<!-- This one has a crisp stroke -->
<rect x="150" width="50" height="50" rx="5" ry="5" stroke="black" stroke-width="1" fill="steelblue" />
</g>
</svg>
Apparently I can't post inline images as a new user, but you can this is an image of how the svg looks for me.
If you don't like the blurry edges, you can always experiment with adding an feComponentTransfer with feFuncA to manually manipulate the edge blur. Aka:
<filter id="fee" x="-20%" y="-20%" width="160%" height="160%">
<feComponentTransfer>
<feFuncA type="table" tableValues="0 0 1" />
</feComponentTransfer>
</filter>