I'm using a <circle> element with stroke-dasharray and stroke-dashoffset to draw an indicator for the focused element of a donut chart, and in Safari it is not coming out right.
The outer pies are <path>s which work fine in all browsers, but as I need the indicator to transition between sectors they need to be <circle>s.
I thought it was because Safari was calculating the circle's circumference based on the svg viewbox or something like that but no dice. Any help would be appreciated.
https://codepen.io/pouretrebelle/pen/d56df310e385a0c2fdedb5bbddc2308d
Rendered in Chrome:
Rendered in Safari:
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I am trying to animate the SVG2 Geometry Property r, the radius property of a Circle Element.
I read that the property can be used as CSS property in browsers supporting SVG2 (see Resizing SVG Circle Radius Using CSS Animation).
Now I notice that animating r does only seem to work in Firefox if I express values as percentages. If I use absolute values, the circle is not being animated, see minimum reproduction CodeSandbox.
Does Firefox lack SVG2 support here?
As pointed out, stating lengths in pixel does the job.
The spec indeed says that absolute lenths must be given in physical units.
Omiting them will Chrome use px as fallback unit, while Firefox won't.
As I understand it, the SVG attribute vector-effect="non-scaling-stroke" should prevent strokes from being distorted (made thicker or thinner) if/when the SVG object is scaled or stretched.
For example - in this fiddle (http://jsfiddle.net/1cj0ovae/5/), I have two SVG objects; both are 5x wider than they are tall. Because the view box of both calls for a square, the SVGs are stretched and distorted.
In the upper SVG - the green path is distorted - it's much thicker than it's supposed to be (stroke-width="2").
In the lower SVG, however, the red path is displayed "correctly" - a 2px thick stroke - because it has the vector-effect="non-scaling-stroke" attribute set.
This seems to work in Chrome, Safari, and Firefox, but not in even recent versions of IE (e.g., IE10).
Is this an IE bug? Is there a workaround?
vector-effects is part of SVG 1.2 tiny and the upcoming and as-yet-unfinished SVG 2 specifications.
IE has only targeted SVG 1.1 which does not have vector-effects. Other UAs have cherry picked parts of SVG 1.2 tiny such as vector-effects but no current UA implements it all (Opera 12 did I think).
To work around it figure out how wide the stroke should be using javascript. I.e. work out the difference between the transform that's applied to the shape and apply the inverse of that to the stroke-width. It's not straightforward as I found when I implemented this in Firefox.
Here are the facts:
I have a div with rounded corners containing an SVG element with rounded corners that creates a circle.
Inside the circle (SVG) I am drawing four polygons that make out different circle quadrants.
The polygons respond to hover by changing color - so that when a user mouse is over a specific quadrant in the circle - it lights up.
The SVG and the div containing the SVG both have overflow:hidden CSS directive.
When I mouse over an area outside the circle (but inside the clipped rectangle of the polygon) - the corresponding quadrant lights up...
Why is the element responding to mouse over even though I am hovering over a clipped area?
How can I make sure this will not happen? (without creating occluding transparent elements - I want to be able to touch something in the layer below...).
EDIT:
added fiddle as requested:
http://jsfiddle.net/JVQD8/
In the fiddle - note that the surrounding div is bordered with a red line.
the polygons (in blue) are clipped by the red border (div), and when you hover over a polygon it becomes a lighter shade of blue.
The polygon highlights outside the area of the red circle border if on the polygon.
Edit:
As commented by Robert Longson, there is no problem at all in Firefox.
However, in chrome the problem is as described, and in IE the SVG polygon is not even responding to hover.
So the question about chrome remains as is - only in chrome. How do i know if this is a bug that i should report, or if this is a designed behavioral difference?
Try experimenting with the pointer-events attribute.
https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/pointer-events
I have an SVG I am building with Javascript. I load in a large SVG file, break it apart into pieces all drawn with paths, and place each element in my page. I'm only using these SVGs as masks for other images I am loading. Basically my structure is like the following.
<svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewBox="26.750152587890625 10.117172241210938 197.24969482421875 348.1596221923828" width="197.25" height="348.16015625">
<mask id="designMask" maskContentUnits="objectBoundingBox">
<g id="CutContour1bg">
<path d="[my path coords]" style="fill:#FFFFFF;">
</g>
</mask>
<image href="http://myImage.jpg" style="mask: url(#designMask);" width="800px" height="800px" x="26.75" y="10.1171875">
</svg>
This renders the image being masked by my SVG perfect, in FF, IE9, Chrome, Safari 5.1 (desktop). In mobile safari however, the image does not render properly. I trace out coords of the mask, they are all correct. In FF I can see the SVG load (all black) then disappear as it becomes the mask. (I am waiting until the design is loaded, then wrap my <g> with <mask> since FF has an issue looking for the mask before the content is loaded.
This tells me the mask's position is exactly where it needs to be, but the maskContentUnits are not. They remain in the top left corner instead of the object's bounding box, like I'm telling it. I can barely see part of the image in the mask, so the mask units are correct, but I cannot get the maskContentUnits to work or be read in mobile safari.
Has anyone ever seen this issue, or any idea how to correct it? I hate having this work everywhere except mobile safari, as it is meant to mostly work on mobile... which defeats its not purpose haha.
Thanks!
I haven't found a way to make maskContentUnits work properly in mobile safari yet, I'm pretty sure it's just not recognized yet like other browsers. But I figured out a 'hack' to make the example work.
The issue is, the mask area resides in the top left corner of the browser, rather than of the svg object being used as the mask. So if you have an svg in the middle of your page, the image being masked will not follow the same positioning.
The way I found for it to work, is, I wrapped the svg inside a div with the same width as the svg, and modify the position of the div instead of the svg. This way the mask is technically still in the 'top left' corner, but of the div rather than the offset position of the svg.
If anyone finds a better way, to make maskContentUnits render proper in mobile safari, I'd like to hear it!
I've a question about svg's viewbox, in my opinion it's like a window on an infinite svg plan, and its boundaries are set in the viewBox attribute of the svg element. It represents the rectangle between the 2 coordinates in the svg plan. So a viewBox of "0 0 1000 500" shows the window between (0,0) and (1000,500) of the svg plan.
And when I make viewBox (2000, 0, 3000 500) i see the window of (2000,0) and (3000,500). x and y scaling is unmodified: in both cases i'm displaying 1000 * 500 units of the svg plan.
But apparantly i go wrong some where. I'm experimenting with animating the viewbox to emulate some kind of ticker display, leaving the y coordinates untouched but changing the x coordinates (without changing the actual number of units displayed) but that goes wrong. Somehow my y-scaling changes.
In a modern browser you can verify yourself (pull the slider to change the viewBox).
What did I miss in the SVG specification?
You missed the preserveAspectRatio attribute in the SVG specification. It forces the aspect ratio of what you see in the viewbox to be preserved by default. Sounds like what you're after is preserveAspectRatio="none"