With RaphaelJS, this command inserts an image:-
var myImg = paper.image('image.svg', 100, 100, 150,150);
and the SVG output is:-
<image x="100" y="100" width="150" height="150" preserveAspectRatio="none" href="image.svg"/>
Question: How do I directly access preserveAspectRatio attribute and change it to xMidYMid meet - if you examine myImg.attr(), it doesnt show this attribute.
The roundabout way is navigate the SVG DOM tree, and execute svgImg.setAttributeNS(null,"preserveAspectRatio" , "xMidYMid meet" );
Note: Only some images require none while the rest needs the xMidYMid meet tag. Hence I can't set this attribute on parent <svg>
Note2: Chrome doesn't support preserveAspectRatio with SVG images. Use FF or IE to test.
At the source code level, preserveAspectRatio is hardcoded to none
Answer The quickest way to change this:-;
myImg[0].preserveAspectRatio.baseVal.align = 6 (1 = off, 6 = xMidYMid)
myImg[0].preserveAspectRatio.baseVal.meetOrSlice = 1 (1 = meet, 2 = slice)
Update:- jQuery style:-
jQuery(myImg.node).prop('preserveAspectRatio').baseVal.align = 6 ;
jQuery(myImg.node).prop('preserveAspectRatio').baseVal.meetOrSlice = 1 ;
Raphael's docs for Element.node "Gives you a reference to the DOM object, so you can assign event handlers or just mess around. Note: Don’t mess with it."
You can call these parameters on the Raphael canvas as a whole.
First create SVG:
var paper = Raphael('content',xSize,ySize);
Place image in it:
paper.image('image.svg', 100, 100, 150,150);
Then change attributes of svg:
paper.canvas.setAttribute('preserveAspectRatio', 'xMidYMid meet');
Related
My question: Can svg <marker> elements inherit color from the <line> they are referenced on?
The background: I have a D3 graph that has different styled lines, and I want my lines to have arrows at the end.
So at the top of my <svg> I have const defs = svg.append('defs'); and then further along I generate my defs using a generator function:
function makeDefs(defs: Selection<SVGDefsElement, unknown, null, undefined>, color: string, status: string) {
const markerSize = 3
const start = defs.append
.append('marker')
.attr('id', `arrow-start-${color}-${status}`)
.attr('viewBox', '-5 -10 20 20')
.attr('markerWidth', markerSize)
.attr('markerHeight', markerSize)
.attr('orient', 'auto-start-reverse');
start
.append('path')
.attr(
'd',
status === 'PUBLISHED' ? customPaths.arrowLarge : customPaths.arrowSmall
)
.attr('stroke', color)
.attr('fill', color);
}
And use it like so:
makeDefs(defs, 'red', 'DRAFT');
And then I add the markers to my lines with:
// d3 code to draw the lines etc
line.attr(
'marker-start',
(d) =>
`url(
#arrow-start-${d.color}-${d.status}
)`
);
This all works great, my arrows have lines. But my current setup feels burdensome and clunky. I have about 20 colors and 3 statuses. With my current setup that would be 60 different:
makeDefs(defs, 'one-of-20-colors', 'one-of-3-statues');
My understanding of markers is that they can inherit color using the currentcolor attribute. Currently my <defs> sit up top underneath my main <svg> so any color inherited is inherited directly from that top level svg which is not what I want. The issue in my case is my <line> elements are the elements who's color I want to inherit, but according to the MDN docs <line>s cannot have <defs> as children, thus leaving me with the only option, of defining all my <defs> up front all at once.
Is there a trick or some attribute I'm missing here?
Any way to pass color to my marker when doing:
line.attr(
'marker-start',
(d) =>
`url(
#arrow-start-${d.color}-${d.status}
)`
);
?
For what is is worth, I'm currently wrapping all my <line>s in <g>. I suppose I could wrap them in <svg>s instead, and apply the fill and stroke there, and then define my <defs> per svg container? I tried this briefly and swapping the <g> for an <svg> broke a lot, but I'm not even sure if it would work, or be better for that matter.
I'm trying to create an SVG element with a width defined by a percentage of the parent and a fixed value, say 50% + 20px. For normal html elements, in the CSS you can use calc(50% + 20px). Is there an equivalent way to do this for embedded SVGs? Specifically, I'm using snap.svg, though I'm not sure if this capability exists with SVGs in general.
EDIT:
Tried setting <svg> width with percentages and px, which I couldn't get to work. I tried both:
<svg width='calc(50% + 20px)'>...</svg>
<svg width='50% + 20px'>...</svg>
I also tried setting it in CSS:
svg {
width: calc(50% + 20px);
}
It should be possible with the upcoming SVG2 as width etc. become geometry properties and then you can style them with calc
I want to put a rectangle around a text in SVG.
The height of the text is known to me (the font-size attribute of the text element). But the width is dependent on the actual content. Using getBBox() or getComputedTextLength() should work. But this only works after rendering.
Is there a way to specify that in an other way? For example defining the x and width attributes relative to other values? I didn't find anything like that in the SVG Spec.
Figuring where text ends presumably requires roughly the same underlying code path as the rendering itself implements - going through the width of each character based on the font and style, etc... As I am not aware the SVG standards define a method for directly getting this information without doing the actual full rendering, till such methods emerge or are reported here by others, the approach should be to render invisibly before doing the actual rendering.
You can do that in a hidden layer (z-index, opacity and stuff) or outside the visible viewport, whichever works best in experimentation. You just need to get the browser do the rendering to find out, so you render invisibly for that sake, then use getComputedTextLength()
I know this is old, but a few ideas:
If you can choose a mono-spaced font, you know your width by a simple constant multiplication with glyph count
If you are bound to proportional fonts, you can find an average glyph size, do the math as with mono-space, and leave enough padding. Alternatively you can fill the padding with text element textLength attribute. If the constant is chosen carefully, the results are not very displeasing.
EDIT: As matanster found it to be hacky
Predetermine glyph widths with getComputedTextLength() and build a lookup table. Downside is that it does not account for kerning, but if your cache size is not a problem, you can append glyph-pair widths to this lookup.
Going beyond that is to find some way to do server side rendering: Is there a way to perform server side rendering of SVG graphics using React?
It is possible using canvas with measureText():
// Get text width before rendering
const getTextWidth = (text, font) => {
const element = document.createElement('canvas');
const context = element.getContext('2d');
context.font = font;
return context.measureText(text).width;
}
// Demo
const font = '16px serif';
const text = 'My svg text';
const textWidth = getTextWidth(text, font);
document.body.innerHTML = `
<svg>
<text x="0" y="20" font="${font}">${text}</text>
<rect x="0" y="30" width="${textWidth}" height="4" fill="red" />
</svg>
`;
Adapted from https://stackoverflow.com/a/31305410/1657101
I have a huge svg 3200*1800. I only want to show a part of that image something like 400*1000, ensuring that the width is the dominant attribute and having a scroll bar for the height but when I set viewbox it increase the width to display the added height.
viewBox="900 550 400 1000"
Is their a way to stop this happening?
I worked it out you need to increase the height relative to the viewbox for example I ended up with something like this:
width="1400"
height="4000"
viewBox="966 555 350 1000"
Compared to what I used to have:
width="350"
height="1000"
viewBox="966 555 350 1000"
You just set 'preserveAspectRatio' to "none" along with your 'viewBox' attribute, then your problem is solved.
This answer builds on Shane's answer (which does not cater to variable window sizes)...
To have width-dominant overflows:
Let the 'viewbox' define the portion of the graphic to display (any known aspect ratio)
Let the svg element have default width and height (100%)
With javascript, dynamically set the height of the svg element every time the window resizes
The code below works for my learning project and is NOT production code.
In the head element:
<script type="application/javascript">
var svgRatio = ${viewboxRatio}; // ratio must be known
// From http://stackoverflow.com/a/13651455
if(window.attachEvent) {
window.attachEvent('onresize', resizeSvg);
}
else if(window.addEventListener) {
window.addEventListener('resize', resizeSvg, true);
}
else {
//The browser does not support Javascript event binding
}
function resizeSvg() {
var height = window.innerWidth * svgRatio;
var svg = document.getElementsByTagName('svg')[0];
svg.setAttribute("height", height.toString());
}
</script>
At the end of the body:
<script type="application/javascript">
resizeSvg();
</script>
I get an XML or JSON with paths only, and I need to recreate the SVG image.
I create an empty
<svg xmlns='http://www.w3.org/2000/svg' version='1.1'></svg>,
I add a <g transform="scale(1 -1)" fill='#aaa' stroke='black' stroke-width='5' ></g> in it, and then in this element I add all of the paths in it (e.g. <path d= ... />).
In the end I get a SVG image, but because I haven't set the viewBox attribute in the SVG element the image isn't properly displayed - when I open it in browser, a part of it is displayed full size.
Can the viewBox be calculated from the values from the paths?
Thank you!
Similar to Martin Spa's answer, but a better way to do get the max viewport area is using the getBBox function:
var clientrect = path.getBBox();
var viewBox = clientrect.x+' '+clientrect.y+' '+clientrect.width+' '+clientrect.height;
You can then set the viewbox to these co-ordinates.
n.b. i think you can change the viewbox of an svg after it's rendered so you may have to re-render the svg.
OK so I solved it the following way:
removed all letters from the paths string and made an array out of it with
var values = pathValue.split('L').join(' ').split('M').join(' ').split('z').join('').split(' ');
found max and min from those values:
var max = Math.max.apply( Math, values );
var min = Math.min.apply( Math, values );
set the viewBox:
viewBox = max min max max
This worked in my case excellent. Hope that it will be helpful to someone else too.