Someone posted an answer, that showed a workaround for this. The idea is to set height and width to 0 before deleting the canvases. It is not really a proper solution, but it will work in my cache system. I add a small example that creates canvases until an exception is thrown, then empties the … Read more
Yes, it’s possible. You can use CanvasRenderer instead of WebGLRenderer. About WebGL detection: 1) Read this WebGL wiki article: http://www.khronos.org/webgl/wiki/FAQ if (!window.WebGLRenderingContext) { // the browser doesn’t even know what WebGL is window.location = “http://get.webgl.org”; } else { var canvas = document.getElementById(“myCanvas”); var context = canvas.getContext(“webgl”); if (!context) { // browser supports WebGL but initialization … Read more
Got it! Create a canvas Draw the fa icon on it Change it into a base-64 image url Apply the image on the cursor css style And I made a demo: http://jsfiddle.net/rqq8B/2/ // http://stackoverflow.com/questions/13761472/how-to-render-glyphs-from-fontawesome-on-a-canvas-element // http://stackoverflow.com/questions/13932291/css-cursor-using-data-uri $(function() { var canvas = document.createElement(“canvas”); canvas.width = 24; canvas.height = 24; //document.body.appendChild(canvas); var ctx = canvas.getContext(“2d”); ctx.fillStyle = … Read more
The question as it stands is a bit unclear IMO. To give a more general answer that you can apply to a scenario where you need clipping you can use (at least) two approaches: Method 1 – Using composite mode to clip Composite mode is the simplest way but also the least flexible as you … Read more
Quick answer – no and it is quite unlikely you will find a cross-browser solution. It is very unlikely that you will find a PDF-perfect solution. Better to think about having the users edit HTML and generate the PDF at the server. [Edit June 29th 2021- given this question is from 2017 you may think … Read more
You need to compress the images in the PDF’s that you are generating. Try using Deflate.js and adler32cs.js and use the compress parameter in both jsPDF and addImage functions that you are using. For eg : var doc = new jsPDF(‘p’, ‘pt’,’a4′,true); make sure you set the last parameter as ‘true’ refer to : https://github.com/MrRio/jsPDF/blob/ddbfc0f0250ca908f8061a72fa057116b7613e78/jspdf.js#L146 … Read more
Small update, as the question is now more than half a year old: In Chrome/Chromium 6 you can now send a canvas’ ImageData object to a web worker, let the web worker make changes to the object and then write it back to the canvas using putImageData(..). Google’s Chromabrush does it this way, the source-code … Read more
EDIT: Got it working with var canvas = document.createElement(‘canvas’); canvas.width = 16;canvas.height = 16; var ctx = canvas.getContext(‘2d’); var img = new Image(); img.src=”https://stackoverflow.com/favicon.ico”; img.onload = function() { ctx.drawImage(img, 0, 0); ctx.fillStyle = “#F00″; ctx.fillRect(10, 7, 6, 8); ctx.fillStyle=”#FFFFFF”; ctx.font=”bold 10px sans-serif”; ctx.fillText(‘2’, 10, 14); var link = document.createElement(‘link’); link.type=”image/x-icon”; link.rel=”shortcut icon”; link.href = canvas.toDataURL(“image/x-icon”); … Read more
For those looking for examples using create-react-app Install yarn add –dev jest-canvas-mock Create a new ${rootDir}/src/setupTests.js with import ‘jest-canvas-mock’;
For others who hit this page while searching for getContext returning null, it can happen if you have already requested a different type of context. For example: var canvas = …; var ctx2d = canvas.getContext(‘2d’); var ctx3d = canvas.getContext(‘webgl’); // will always be null The same is equally true if you reverse the order of … Read more