I am also looking for an answer to this question, (to clarify, I want to be able to draw an image with user defined opacity such as how you can draw shapes with opacity) if you draw with primitive shapes you can set fill and stroke color with alpha to define the transparency. As far … Read more
The canvas DOM element has .height and .width properties that correspond to the height=”…” and width=”…” attributes. Set them to numeric values in JavaScript code to resize your canvas. For example: var canvas = document.getElementsByTagName(‘canvas’)[0]; canvas.width = 800; canvas.height = 600; Note that this clears the canvas, though you should follow with ctx.clearRect( 0, 0, … 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
If you like simplicity but still want cross-browser functionality I found this solution worked best for me. This is a simplification of @Aldekein´s solution but without jQuery. function getCursorPosition(canvas, event) { const rect = canvas.getBoundingClientRect() const x = event.clientX – rect.left const y = event.clientY – rect.top console.log(“x: ” + x + ” y: ” … Read more
So what do you do if all the browsers (actually, Chrome 5 gave me quite good one) won’t give you good enough resampling quality? You implement them yourself then! Oh come on, we’re entering the new age of Web 3.0, HTML5 compliant browsers, super optimized JIT javascript compilers, multi-core(†) machines, with tons of memory, what … Read more
Original answer was specific to a similar question. This has been revised: const canvas = document.getElementById(‘mycanvas’) const img = canvas.toDataURL(‘image/png’) with the value in IMG you can write it out as a new Image like so: document.getElementById(‘existing-image-id’).src = img or document.write(‘<img src=”‘+img+'”/>’);
JavaScript can read the DOM and render a fairly accurate representation of that using canvas. I have been working on a script which converts HTML into a canvas image. Decided today to make an implementation of it into sending feedbacks like you described. The script allows you to create feedback forms which include a screenshot, … 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);