The github project JavaScript-Load-Image provides a complete solution to the EXIF orientation problem, correctly rotating/mirroring images for all 8 exif orientations. See the online demo of javascript exif orientation The image is drawn onto an HTML5 canvas. Its correct rendering is implemented in js/load-image-orientation.js through canvas operations. Hope this saves somebody else some time, and … Read more
I want this word to be drawn with an animation, such that the page “writes” the word out the same way that we would Canvas version This will draw single chars more like one would write by hand. It uses a long dash-pattern where the on/off order is swapped over time per char. It also … Read more
You need to extract the base64 image data from that string, decode it and then you can save it to disk, you don’t need GD since it already is a png. $data=”data:image/png;base64,AAAFBfj42Pj4″; list($type, $data) = explode(‘;’, $data); list(, $data) = explode(‘,’, $data); $data = base64_decode($data); file_put_contents(‘/tmp/image.png’, $data); And as a one-liner: $data = base64_decode(preg_replace(‘#^data:image/\w+;base64,#i’, ”, … Read more
For security reasons, your local drive is declared to be “other-domain” and will taint the canvas. (That’s because your most sensitive info is likely on your local drive!). While testing try these workarounds: Put all page related files (.html, .jpg, .js, .css, etc) on your desktop (not in sub-folders). Post your images to a site … Read more
Here is an example of how to achieve what you need: Draw something (taken from canvas tutorial) <canvas id=”myCanvas” width=”578″ height=”200″></canvas> <script> var canvas = document.getElementById(‘myCanvas’); var context = canvas.getContext(‘2d’); // begin custom shape context.beginPath(); context.moveTo(170, 80); context.bezierCurveTo(130, 100, 130, 150, 230, 150); context.bezierCurveTo(250, 180, 320, 180, 340, 150); context.bezierCurveTo(420, 150, 420, 120, 390, 100); … Read more
I believe I have found an elegant solution to this: JavaScript /* important! for alignment, you should make things * relative to the canvas’ current width/height. */ function draw() { var ctx = (a canvas context); ctx.canvas.width = window.innerWidth; ctx.canvas.height = window.innerHeight; //…drawing code… } CSS html, body { width: 100%; height: 100%; margin: 0; … Read more
The short answer: SVG would be easier for you, since selection and moving it around is already built in. SVG objects are DOM objects, so they have “click” handlers, etc. DIVs are okay but clunky and have awful performance loading at large numbers. Canvas has the best performance hands-down, but you have to implement all … Read more
Given that canvas is a canvas element or an OffscreenCanvas object, const context = canvas.getContext(‘2d’); context.clearRect(0, 0, canvas.width, canvas.height);