I have HTML canvases on top of each other, I draw them just once, I witness that the load has been completed and everything is fine for few minutes, then randomly, without the canvas ever being redraw then lower half of the top canvas begings flickering, no JavaScript function being done in the background. I …
Tag: html5-canvas
How to display binary image in react using canvas and useRefs
I have a mock RGBA image in the form [255, 0, 0, 255] and I want to display it on my webpage using react. I’m expecting a red pixel when I load this component in the main component, however, I can’t seem to load anything. Elements don’t even show up in the elements tab. Could someone guide m…
How to Create a Separate Clock and control it with Custom control in Cesium Js
I’m working in a simulation project where I need to apply animations on different entities. Project demanding is to create custom control to Play/Pause animations. Entities are using Interpolated Paths to move on them. As shown in this example. I want to apply a separate Clock rather then using default …
Canvas drawImage() with image doesn’t draw anything
I want to change all images src of document to dataURL. I am trying to draw all image in canvas through for of loop but it doesn’t work. Help me! Answer Your code isn’t waiting for the images to load. Add your canvas drawing code to the onload function of each image to execute it only once the ima…
What’s wrong with the addEventListeners
the vector should be able to be pulled and repositioned. ugh!. I have it up on fiddle at jsFiddle Answer There is nothing messy with JavaScript, you just need a lot more practice… Few things on your code, as they point out in the comments you have a typo cleintY, also you have to substract the canvas.of…
drawStar() with mouse inside canvas mouse up mouse down
What am I missing? The drawCircle and DrawPolygon (it is located in codepen https://codepen.io/mancod/pen/oNYdrVL work fine. I am still very new to all this still, and beat myself up as nothing in life should be this messy. A star is a circle as is a polygon. I get that the star has an inner and outer radius,…
Assign a linearGradient to a canvas background color
I have created a gradient, and wish to make it the background color of the canvas, but the canvas doesn’t work with it. the rectangle which I drew to ensure the validity of the gradient works just fine however. What is wrong here, can you simply not make a background color a gradient? Do I have to resor…
Canvas linear gradient taking the value of another input type color field
So I have this simple image editor where I’m using a canvas to draw in a user-selected image and some texts. That is the user can upload an image and then if they want they can add texts or just change the gradient of the image. Right now the app works perfectly fine except there is one issue. How to
JavaScript – Get brightness of single character
I am making an image/video to ASCII converter. For this, I need to get the average darkness for each character I will use. I modified the answer to this question, which gets the average brightness of an image. But it keeps saying that the brightness is 0. What did I do wrong? Answer For starters, please don&#…
I want to change the color of an image inside a image in html5-canvas
I’m using canvas to make a badge. To draw the image I used the code : The preview is like this. canvas-image Now, to color the images, I’ve tried using different blend modes. It works fine when I work it around for the background that is image. I tried to do it for the iconImage the same way, but …