How text works in canvas Unfortunately no, you can’t produce text with background with the text methods – only fill or outline the text itself. This is because the glyphs from the typeface (font) are converted to individual shapes or paths if you want, where the background of it would be the inner part of … Read more
Sounds like you want to rotate the rect around its centerpoint. Red rectangle is original, Yellow rectangle is rotated around the centerpoint. To do that you need to first context.translate to the rect’s centerpoint before rotating. // move the rotation point to the center of the rect ctx.translate( x+width/2, y+height/2 ); // rotate the rect … Read more
What you have looks correct, so you might double-check for a typo somewhere. [additional thought: Is your image really 1836×3264 and not 3264×1836.] Here is working code and a Fiddle: http://jsfiddle.net/m1erickson/MLGr4/ <!doctype html> <html> <head> <link rel=”stylesheet” type=”text/css” media=”all” href=”https://stackoverflow.com/questions/15192343/css/reset.css” /> <!– reset css –> <script type=”text/javascript” src=”http://code.jquery.com/jquery.min.js”></script> <style> body{ background-color: ivory; } canvas{border:1px solid … Read more
As of Feb 2016, these browsers support toBlob() Firefox 19 Chrome 50 IE10 as the prefixed msToBlob() Note this answer was originally written in 2011. Original answer/edits below. toBlob() is really new and I would not recommend using it in a consumer app unless you can explicitly ask them to use a particular browser (or … Read more
html2canvas(mydiv, { onclone: function (clonedDoc) { clonedDoc.getElementById(‘mydiv’).style.display = ‘block’; } }).then((canvas)=>{ //your onrendered function code here })
[Edit ~5 years later: some of this is beginning to change, and there are new web platform features that actually allow rendering to a canvas from a Worker! See this blog for more info: https://hacks.mozilla.org/2016/01/webgl-off-the-main-thread/ – the rest of the answer is provided for 2011-era information ;)] Web workers can only calculate, not modify the … Read more
EDIT: this answer doesn’t work on new chrome versions see: chrome canvas inspector 2015 In Chrome Canary: in your browser, enter this url chrome://flags/ enable Enable Developer Tools experiments relaunch Chrome in the developer tools, click the gear to bring up developer preferences select experiments from the menu select Canvas Inspections close devtools, refresh the … Read more
We finally managed to work with AngularJS and HTML5 Canvas together. Here below, I will share, briefly, our requirements and the approach we followed to achieve it. The requirement was a bit tricky as we wanted to: Handle event handles on individual elements inside the canvas, and be able to add these elements dynamically based … Read more
Draw the black shape in the OP– that is, draw a rectangle with a circle cut out of the middle. First call beginPath(); then draw the circle clockwise; then draw the rectangle counter-clockwise (or vice versa); and finally fill(). var ctx = $(‘#cv’).get(0).getContext(‘2d’); ctx.fillStyle = “grey”; ctx.beginPath(); ctx.arc(200, 200, 100, 0, 2 * Math.PI); ctx.rect(400, … Read more
Use .arc to create a circular stroke and then use .clip() to make that the current clipping region. Then you can use .clearRect() to erase the whole canvas, but only the clipped area will change.