I determined using the core api that the method "svgCanvas.importImage(url) can import base64 encoded images.
But the embedded API does not expose this method which is private. It also seems i can not use any of the methods that method uses (svgFromgJson, etc).
Does anyone have advice on how I can load a base 64 string representing an image when the embedded svg-edit starts up? I am thinking to just wrap that string inside an < image> tag in a mock svg file and import that way..
Does SVG support embedding of bitmap images?
Modifying the existing code, based on the answer in my original question I modified their sample import, and it works just wonderfully.
Include the embedapi.js in your page
Define an Iframe to show svg-edit
Call the following code function in the iframe's onload event
// call onLoad for the iframe
var frame = document.getElementById('svgedit');
svgCanvas = new embedded_svg_edit(frame);
// Hide main button, as we will be controlling new/load/save etc from the host document
var doc;
doc = frame.contentDocument;
if (!doc)
{
doc = frame.contentWindow.document;
}
var mainButton = doc.getElementById('main_button');
mainButton.style.display = 'none';
var embeddedImage='<image xlink:href="data:image/png;base64,..OMITTED FOR BREVITY.." id="svg_2" height="128" width="128" y="0" x="0"/>';
var svgDef = '<svg width="128" height="128" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g><title>Layer 1</title>' + embeddedImage + '</g></svg>';
svgCanvas.setSvgString(svgDef);
}
Related
I have an SVG loading like this:
<object id="svg-object" type="image/svg+xml" width="1400px" height="900px" data="media/1.svg?"></object>
I then have a function that works calling out one element in this svg and apply a style to it just fine. Here is the onload event that is working for getting me the element properly:
window.onload=function() {
var svgObject = document.getElementById('svg-object').contentDocument;
var element = svgObject.getElementById('sprite1');
};
But how do I set a .hover even in for this same element? I've tried:
$('#${element}').hover(function(e) { }
But no luck.
Also, how can I apply the svgObject variable to a whole class like path or polygon? I use this on a local inline SVG and it works fine:
$("polygon, path").hover(function(e) { }
I would like this to work on the object embedded in the svg also.
Sorry, I am not able to put an external svg in snippet (or at least I don't know how) as external URL will not load in an object. And it needs to load as an object for you to see the issue.
Any help?
Also, here is code that works defining element color from script but mouseover not working either. (tried instead of hover)
window.onload=function() {
var svgObject = document.getElementById('svgEmb').contentDocument;
var element = svgObject.getElementById('left');
element.style.fill = "blue";
element.style.stroke ="blue";
};
element.addEventListener("mouseover", function() {
element.style.fill = "red";
element.style.stroke ="red";
});
I am writing an web app that saves html to onenote. In order to save math formulas, I plan to convert math formulas to svg by MathJax.js and then convert svg to png, because the html/css supported in onenote api is limited.
But it seems the svg generated by MathJax.js in browser is not a valid svg. I tested it with a simple math formula: $$a^2 + b^2 = c^2$$ (demo code) and copy the svg to jsfiddle and it displays nothing.
Then I tried to write a MathJax-node demo and copy the svg to jsfiddle again, it looks good. Here is my demo code, it's almost the same as the GitHub repo demo:
// a simple TeX-input example
const fs = require('fs')
var mjAPI = require("mathjax-node");
mjAPI.config({
MathJax: {
// traditional MathJax configuration
}
});
mjAPI.start();
var yourMath = String.raw`a^2 + b^2 = c^2`
mjAPI.typeset({
math: yourMath,
format: "TeX", // or "inline-TeX", "MathML"
svg: true, // or svg:true, or html:true
}, function (data) {
if (!data.errors) {console.log(data.svg)}
// will produce:
// <math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
// <mi>E</mi>
// <mo>=</mo>
// <mi>m</mi>
// <msup>
// <mi>c</mi>
// <mn>2</mn>
// </msup>
// </math>
fs.writeFile('math.txt', data.svg, (error) => {
console.log(error)
})
});
I also tested two svg with cloudconvert, it's the same result. Why are the two svg different? Do I miss something?
The difference is due to a specific setting: useGlobalCache
By default, MathJax (docs) sets this to true while mathjax-node (docs) sets this to false.
On the server MathJax-node does not have any document context and produces self-contained SVGs. On the client, MathJax has a full document context and thus can re-use the SVG paths across equations.
I Googled this issue for about 30 minutes and was surprised nobody has asked so maybe it's not possible.
I'm using this line to embed the SVG file that I made in AI (note that when I saved the SVG, I had no fill OR stroke on the paths):
<object type="image/svg+xml" data="example.svg" height=600px width=600px>Your browser does not support SVG</object>
This obviously comes up with no image because the SVG file has no fill or stroke.
I tried adding in
...fill=yellow>
or
...style="fill:yellow;">
but I'm not having any luck. Thanks!
Have a nice trick: Embed it as <img> and use javascript to convert it into inline <svg> with this code (that came from SO I think). Now you can manipulate this SVG object
CODE::
/*
* Replace all SVG images with inline SVG
*/
jQuery('img.svg').each(function(){
var $img = jQuery(this);
var imgID = $img.attr('id');
var imgClass = $img.attr('class');
var imgURL = $img.attr('src');
jQuery.get(imgURL, function(data) {
// Get the SVG tag, ignore the rest
var $svg = jQuery(data).find('svg');
// Add replaced image's ID to the new SVG
if(typeof imgID !== 'undefined') {
$svg = $svg.attr('id', imgID);
}
// Add replaced image's classes to the new SVG
if(typeof imgClass !== 'undefined') {
$svg = $svg.attr('class', imgClass+' replaced-svg');
}
// Remove any invalid XML tags as per http://validator.w3.org
$svg = $svg.removeAttr('xmlns:a');
// Replace image with new SVG
$img.replaceWith($svg);
});
});
Are you trying to add the fill or style on the object element? If so, that's not going to work. Those properties are not supported on the object element. You're going to have to add it into the SVG in the SVG file.
Good day.
I use script Imagecropper
Script:
<img src="http://test.com/img/1362244329.jpg" id="yui_img" height="768" width="1024">
<script>
(function() {
var Dom = YAHOO.util.Dom,
Event = YAHOO.util.Event;
var crop = new YAHOO.widget.ImageCropper('yui_img');
})();
</script>
result:
But if i do not specify the image size, then i get next(see image):
<img src="http://test.com/img/1362244329.jpg" id="yui_img">
result:
And if i specify the wrong picture size, the window will increase the portion of the image:
<img src="http://test.com/img/1362244329.jpg" id="yui_img" height="333" width="500">
result:
How to make in tag image does not necessarily will been to specify its size?
First of all I'd like to point you to YUI 3 since YUI 2 is no longer supported. You shouldn't write new code using YUI 2. There's an ImageCropper component I wrote for YUI 3 that works just like the YUI 2 version in the YUI Gallery: http://yuilibrary.com/gallery/show/imagecropper. Since it copies what the YUI 2 ImageCropper did, it shares these issues with the older version.
What to do when the size of the image isn't specified
The reason why you're getting a small ImageCropper is that you're creating the widget before the image has been fetched and so the browser doesn't know its size yet. What you can do is wait for the image's onload event. You can listen to that event and create the ImageCropper after it fires:
(function() {
var Dom = YAHOO.util.Dom,
Event = YAHOO.util.Event;
var yui_img = Dom.get('yui_img');
Event.addListener(yui_img, 'load', function () {
var crop = new YAHOO.widget.ImageCropper(yui_img);
});
})();
Why the ImageCropper doesn't work with images with the wrong size
Neither the YUI 2 ImageCropper nor my YUI 3 version work with images when they don't have the right size. The reason is that both use the background: url() CSS style for showing the image inside the crop area (the non-darkened part of the widget). CSS backgrounds don't let you use a resized/zoomed image.
I plan on using another strategy at some point for the YUI 3 version that will fix the issue. However, you need to keep in mind that the ImageCropper component is designed so that you send the crop coordinates to the server for it to actually crop the image. That means that if you have the wrong size set to the image, the coordinates that the image cropper returns with its getCropCoords method wouldn't be the coordinates that match with the full sized image. Instead you'd also have to send the server the size of the image you've been using and do extra math to crop the image correctly.
In conclusion, you shouldn't use the image with the wrong size. You can fix the size of the image in two ways:
Use the HTML5 naturalWidth and naturalHeight attributes of the image. Those return the real size of the image even if it's resized. Unfortunately these attributes are not yet supported by all browsers.
Create a new image with JS, set it the same src as the image you're using, listen to its load event and get that image's size.
Something like this:
(function () {
var Dom = YAHOO.util.Dom;
var yui_img = Dom.get('yui_img'),
new_img = new Image();
new_img.onload = function () {
yui_img.width = new_img.width;
yui_img.height = new_img.height;
// create the ImageCropper
};
new_img.src = yui_img.src;
}());
A YUI3 version
You can easily do all this with YUI3:
YUI().use('gallery-imagecropper', function (Y) {
var img = Y.one('#yui_img');
img.on('load', function () {
var cropper = new Y.ImageCroper({
srcNode: img,
width: img.get('width'),
height: img.get('height')
});
cropper.render();
});
});
Typo in code. Should be
var cropper = new Y.ImageCropper({
You missed a letter "p".
I'm using fabric.js to add and manipulate images on canvas element. I'd like to export the final result to an image file (JPEG/PNG), and have tried several approaches, without much luck.
The first was using the HTML5 canvas.toDataURL callback - didn't work (apparently this cannot be done with cross-origin images).
I then tried to export the canvas to SVG and use convert utility:
$ convert file.svg file.png
The SVG looks a bit like this:
<svg>
...
<image xlink:href="http://example.com/images/image.png"
style="stroke: none; stroke-width: 1; stroke-dasharray: ; fill: rgb(0,0,0); opacity: 1;"
transform="translate(-160 -247.5)" width="320" height="495">
</image>
...
</svg>
That also didn't work, presumably because of the image links. I then tried to download the linked image and store it locally, replacing the http://...image.png link with /path/to/image.png. No luck.
Is there a way to make this happen? thanks.
UPDATE
I've since solved this by using fabric's node module (npm install fabric) and simply using fabric's JSON representation of the canvas (canvas.toJSON() in fabric) to generate an image (also uses canvas module - npm install canvas).
Here's a simple example on how to do this:
// import the fabric module
var fabric = require('fabric').fabric,
fs = require('fs');
// read the fabric json data as string
// (from file, db, etc)
var jsonString = readJSON(filepath);
// create canvas with specified dimensions
// (change to match your needs)
canvas = fabric.createCanvasForNode(100, 100);
// create output file to hold the png image
output = fs.createWriteStream("/tmp/image.png")
// load the json to the canvas and
// pipe the output to the png file
canvas.loadFromJSON(jsonString, function() {
var stream = canvas.createPNGStream();
stream.pipe(output)
});