I am trying to create a wide horizontal curly-bracket starting with the keyboard character and transforming it.
I started with :
<text x="40" y="120" transform="rotate(90, 40, 120)">}</text>
Now I would like to stretch the text to make it wider.
Forget about using the CSS font-size element, size the font-weight will also change accordingly, producing a fat symbol.
I would like to stretch the character by keeping it thin.
I then started using the symbol and usecombination, to try to take advantage of the viewbox capability
Here is what I tried last :
<symbol id="curly-bracket">
<text>}</text>
</symbol>
<use x="40" y="120" transform="rotate(90, 40, 120)" xlink:href="#curly-bracket" />
The character now appears cut and I found no way to make it be displayed properly.
I am having a hard time understanding what I am doing, reading the W3 SVG doc.
<text x="40" y="120" transform="rotate(90, 40, 120) scale(1,2)">}</text>
That will double all the y coordinates, and since you've turned it 90 degrees, will stretch it horizontally.
Attempting to learn SVG from the W3 spec is going to leave you frustrated and confused. It's not written as a tutorial on how to use it. Here's a great resource on SVG transforms. I'd recommend reading that entire e-book if you're really interested in SVG. I think it's the best resource out there.
Related
Filling and stroking a circle with the same color and a stroke-width exceeding a certain size, produces a strange transparent region “between” the two paint regions. What is going on?
This is happening in both Chrome and Firefox, so it may be to spec, but I couldn’t find any language in the spec about this behavior.
Fiddle
<svg viewBox="0 0 300 300">
<circle cx="100" cy="100" r="8"
stroke="#000" stroke-width="40"
fill="#000"/>
</svg>
Produces this rendering:
As Robert Longson noted, the issue shows up when a stroke overlaps itself in such a way that it creates a donut-hole when you convert the stroke outline to a separate path (depending on the winding-order / fill-rule calculations).
The gap between the fill and stroke in your particular example is caused by the "inside" edge of the stroke extending across the entire fill region and out the other side.
It gets really weird when you have dashed strokes, as shown in the examples from Tavmjong Bah's discussion article.
This is, unfortunately, neither according to the SVG spec nor against the spec. Instead, the spec at this point of time has left the matter undefined.
SVG working group discussion is here.
At this point, WebKit, Blink, and Firefox on Mac/Android draw strokes with cut-outs, using the Skia graphics library or Apple's CoreGraphics.
IE/Edge and Firefox on Windows/Linux just draw the total stroke, without cut-outs, as do Inkscape and Illustrator and most PDF-rendering software (the PDF spec itself is non-committal).
Everyone I've discussed this with agrees that the cut-outs are a sub-optimal result. But with so many browsers using rendering engines that do it this way, the SVG working group wasn't willing to make the more-intuitive stroke behavior a strict requirement. So instead, the SVG 2 spec has a warning-to-authors with a sample figure:
At this point, the best prospect for making a change would be to file issues (or contribute code) on the Skia library. If it was changed, that puts pressure on Apple to update to match, and the SVG spec would be able to make it official.
I found that adding stroke-linecap="round" style="stroke-dasharray: 1000" fixes the issue by introducing virtual dashes
<svg viewBox="0 0 300 300">
<circle cx="100" cy="100" r="8"
stroke="#000" stroke-width="40"
fill="#0F0" stroke-linecap="round" style="stroke-dasharray: 1000" />
</svg>
It's an artifact because the stroke width is so big it crosses the centre of the circle. It shouldn't happen but it's easily avoided by increasing r and decreasing the stroke-width.
I am developing a web page trying to focus on accessibility, and created different graphics in SVG to go in it. After reading different sites online (1, 2, and 3), I included the <title> and <desc> tags, and added the attributes role and aria-labelledby to make the SVGs more accessible.
Some of those sources, seem to claim (directly or indirectly) that using SVG inline is better for accessibility; so I ran a few tests with NVDA to see the differences, but I fail to see any at first sight.
For example, using a simple SVG:
<svg width="100" height="100" viewBox="0 0 100 100" role="img" aria-labelledby="title desc">
<title id="title">Abstract Forms</title>
<desc id="desc">Red square containing a white circle containing a blue triangle pointing up.</desc>
<g stroke="none" stroke-width="0">
<rect x="0" y="0" width="100" height="100" fill="red" />
<circle cx="50" cy="50" r="40" fill="white" />
<path d="M 50,20 80,70 20,70 Z" fill="blue" />
</g>
</svg>
If I add it to the page like that, NVDA reads "Graphic. Abstract Forms. Red square containing a white circle containing a blue triangle pointing up."
And if I save it into a myImg.svg file, and add it to the page like this:
<img src="myImg.svg" alt="Red square containing a white circle containing a blue triangle pointing up" title="Abstract Forms" />
NVDA then reads "Graphic. Red square containing a white circle containing a blue triangle pointing up." (same thing as before, just not reading the title).
This may be an NVDA thing, and other screen readers may do it differently, but there doesn't seem to be any considerable difference between the two. At least not to claim that inlining the SVG is better for accessibility.
Then I thought it could be related to reading additional information; for example, if there was some text within the graphic. So I added a <text x="50" y="50" fill="black">Hello World</text> at the end of the SVG... but NVDA read the same thing as before; not even selecting the text it will read it (again I don't know if this is an NVDA thing and if other screen readers do it differently).
So my questions are: what are the differences between having SVG inline or as an image? And what are the benefits (for accessibility) of having the SVG inline?
You probably already self-answered your question.
Inline-svg is interpreted as part of the html webpage. So your svg title and description are interpreted as well and read by the screen reader.
When using an ‘img‘ tag to include the svg, the file is handled like an external file (like a jpg) and so only the ‘alt‘ attribute of the img tag (= the image description) is interpreted/read by the screen reader.
I have currently no source and can't test it a the moment, but I think there are also differences for links within the svg code: Links within inline svg are read by the screenreader, links within external svg files not.
TL;DR: I need to mask out a portion of one rectangle in SVG, based on the size and position of another existing rectangle, which will be changing dynamically. A Chrome bug is blocking the mask + use approach I tried. How can I do a mask or inverted clip path based on an existing shape?
Full Overview:
I'm using D3.js, and I am using the brush control to add a brush to a rectangle in an embedded SVG. By default, this adds some extra elements to the SVG, including a rect with class extent that shows the size of the brushed area.
Rather than have the brush extent be rendered as a semi-transparent overlay on top of the rectangle, as in most D3 examples, I am trying to "cut out" the extent from a semi-transparent overlay, so that the brush area shows the true color below. Per this question, I am trying to do this with a mask element, with a child use element referencing the extent. With some D3 magic, I now have a structure like this:
<svg width="100" height="100">
<g class="brush-layer inverted">
<defs>
<mask id="mask835">
<rect fill="#fff" width="100%" height="100%"></rect>
<use fill="#000" xlink:href="#extent848"></use>
</mask>
</defs>
<g class="brush" style="pointer-events: none;">
<rect class="overlay" mask="url(#mask835)" width="100%" height="17"></rect>
<rect class="extent" x="30" width="52" height="17" id="extent848"></rect>
</g>
</g>
</svg>
This works great... sort of. It turns out that there appears to be a tricky Chrome bug, which I've filed here, which prevents the mask from being applied if there's a #media query in the CSS. You can see the working version here and the failing version here (fails in Chrome, works in FF).
I need this to work in Chrome, and can't drop the #media query. I also need to make the use element work, because D3 will automatically resize the extent rectangle, and that's the shape I need to mask out.
So, how can I mask out a portion of one rect, based on another rect, without using the mask + use strategy above?
One possible workaround might be to use a custom clip-path, but it's probably not going to be as elegant. Some examples of how to do do this with clip-path can be found in this question.
This question already has answers here:
SVG shadow cut off
(3 answers)
Closed 1 year ago.
I'm trying to add a filter to an SVG created circle, but as soon as I add any sort of filter the top and left sides of the circle are cropped. I've tried playing around with all the settings, including the x, y and width but that has fairly weird and unexpected results. Looking at examples online, it seems to be the same for them too! For instance see the W3 example here http://www.w3schools.com/svg/tryit.asp?filename=trysvg_fegaussianblur. It looks like it has worked fine, but that's because it's a square and you can't tell it's being cropped! Change it to a circle, change:
rect width="90" height="90" stroke="green" stroke-width="3" fill="yellow" filter="url(#f1)"
to
path filter="url(#f1)" fill="none" stroke="#385370" d="M87,15A72,72,0,1,1,86.99,15" stroke-width="30"
And suddenly bits are being cropped. I don't think there's anything wrong with my circle? What's causing this and how come I can't find any other reports of it even though all examples do it?! See http://www.c-sharpcorner.com/UploadFile/99bb20/html5-inline-svg/ as well, their examples do it too! I'm looking on both Chrome and Firefox.
I think you mus define the x, y, width and height. look here:
<filter
id="filter3755"
inkscape:label="testfilter"
x="-0.20000000000000001"
y="-0.20000000000000001"
height="1.3999999999999999"
width="1.3999999999999999">
<feGaussianBlur
stdDeviation="3"
id="feGaussianBlur3757" />
</filter>
the values define the area on which the filter is applied relative to the elements' position and dimension. In the example above the filter has its origin at -0.2% of the element and is 1.4% width and high.
good luck
edit::
like mentioned in the other answer, the svg itself must also be large enough...
Just give the outer <svg> element a height so it's big enough for the content. e.g. height="300". The default is 300px x 150px which is not enough for your example path.
The same thing would happen with the rect if you made it bigger e.g. height="200"
I've got an SVG element that I've created with Inkscape. I then take that SVG and put in as part of an XSL-FO stylesheet that is used to transform XML data and then passed through the IBEX renderer to create a pdf (which is usually then printed). As an example, I have elements in the svg/stylesheet that look like this (extra noise due to the Inkscape export):
<text x="114" x="278.36218" id="id1" xml:space="preserve" style="big-long-style-string-from-inkscape">
<tspan x="114" y="278.36218" id="id2" style="style-string">
<xsl:value-of select="Alias1"/>
</tspan>
</text>
My problem lies in the fact that I don't know how big this text area is going to be. For this particular one, I've got an image to the right of the text in the SVG. However, if this string is the maximum allowed number of W's, it's way too long and goes over the image. What I'd like (in a perfect world) is a way to tell it how many pixels wide I want the text block to be and then have it automatically make the text smaller until it fits in that area. If I can't do that, truncating the text would also work. As a last ditch resort, I'm going to use a fixed width font and do the string truncation myself in the XML generation, although that creates something both less usable and less pretty.
I've poked around the SVG documentation and looked into flowRegions a bit as well as paths, but neither seem to be be quite what I want (maybe they are though). If it helps, here's that style string that Inkscape generates:
"font-size:20px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Sans;-inkscape-font-specification:Sans"
Thanks in advance for the help.
You have text of arbitrary line length (in terms of characters) and you want to scale it to fit inside a fixed amount of space? The only way I can think of to rescale text to a fixed size is to place it inside an svg element and then scale the SVG to that size:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg width="100%" height="100%" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>Resizing Text</title>
<defs>
<svg id="text-1" viewBox="0 0 350 20">
<text id="text-2" x="0" y="0" fill="#000" alignment-baseline="before-edge">It's the end of the world as we know it, and I feel fine!</text>
</svg>
</defs>
<rect x="500" y="100" width="200" height="40" fill="#eee" />
<use x="510" y="110" width="180" height="20" xlink:href="#text-1" />
</svg>
However, as seen above, the viewBox on the encapsulating svg element needs to be set to the width of the text, which you presumably don't know.
If you're referencing this SVG inside a user agent with scripting available (e.g. a web browser) then you could easily write a script to capture the width of the text or tspan element and set the viewBox accordingly.