I currently have a code that when the user clicks on addBall(), a new ball is created on a canvas and they bounce around. However, when the user clicks this button more and more, the number of balls added is…
I´m trying to add an EventListener to my canvas when I lose focus in this canvas. I have two canvases: In the first canvas (at left), I draw a signature, and when change focus to the right canvas, I want…
I am trying to draw a vertical arrow using canvas and javascript. i am able to draw one with arrow head upwards but finding difficulty in placing arrow head at the bottom. The code i am trying <!DOCTYPE html> <html>…
I'm trying to have text fit a circle while typing, something like this: I've tried following Mike Bostock's Fit Text to Circle tutorial, but failed so far, here's my pitiful attempt: import React, { useEffect, useRef, useState } from "react";…
My requestAnimationFrame animation appears to lose frames while drawing time code to a javascript canvas. The time code shows a sequence of 31 graphic states each lasting 24 seconds and I am trying to run it at 24 times real-time…
The problem line is in the handleLineEnd function. I ripped off all the lines not necessary to show the problem. Without the line: I can draw multiple rectangles on the ctx. With the line: Each rectangle is overwritten by the…
The canvas takes up all the available space on the screen, I use it to render the background of the site. canvas { position: absolute; width:100%; height:100%; image-rendering: pixelated; } And I'm drawing images through ctx.drawImage(img, 0,0), I need it…
Indeed, this is very specific to a package, more specifically, @vasturiano's React Force Graph. But, since it makes heavy use of the HTML Canvas and D3.js, I thought maybe someone here could shed a light on how to solve it.…
I have a canvas on which I applied a few transformations (mostly translation to place the origin in the middle and a scale to zoom). I now want to find out if the cursor hovers an element drawn on the…
I have a chart in canvas form and I want to draw a horizontal line when the user enters a number in my form. Each time the user enters a new number a new line is drawn and the old…