When i change a frame size, like 3×3, 4×4, 5×5 etc. canvas draw n number of times constantly calculation in progression. I can’t figure out where the error might be. Can you help me fix this bug. I suspect that the problem is in the function call in the class, or in one of the functions. …
Tag: canvas
Circles in canvas not revolving properly in proper circle
I’m making a simple program using canvas where I have a sun, and there are three planets rotating around it. I managed to make the Sun and the planets. However, when I try to revolve the planets around the Sun, for some reason the planets do not revolve in a perfect circle. Here’s my code: You can…
how to create box in HTML5?
I am trying to create two inner box . I am able to do in using HTML css . working link (expected output) https://stackblitz.com/edit/js-lvzg4o?file=index.js When I trying to do the same thing using Canvas. I am not able create two box or container where I will put my text. is it possible to do same thing usin…
Making a analog clock by using html canvas
Below is my preliminary Javascript code for making a analog clock. My main problem is I don’t know how to clear the “previous second lines” on the clock surface: I have tried to use “ctx.globalCompositeOperation = “destination-over”;”, however not successful: Could yo…
SVG pixelate when using with canvas in full window height and width for all devices
I’m using Jspain library in this project. https://faisalsamroz.com/colorway15/ I drawed SVG image on canvas but it’s pixelating even it shows white dots when you fill up black color. Screenshot attached. Please help if someone else faced the same problem. Answer When an SVG is rendered to a bitmap…
change the alpha for the background color of the canvas
Hi guy i am trying to clone colol wheel picker from adobe color wheel, i am having a problem with changing the alpha for the color wheel, the code i used to generate the color wheel is referenced from here.Below is the code i use to change the alpha for the background of the canvas(default alpha is 255), but …
Javascript pseudo-zoom around mouse position in canvas
I would like to “zoom” (mouse wheel) a grid I have, around the mouse position in canvas (like Desmos does). By zooming, I mean redrawing the lines inside the canvas to look like a zoom effect, NOT performing an actual zoom. And I would like to only use vanilla javascript and no libraries (so that …
readPixels from WebGL2RenderContext returns only black pixels
So there is a game online that uses WebGL2 and WebAssembly. My goal is to interact with the game by script. It uses pointers internally which makes it hard to read data from the game data. That’s why I decided to go over the UI using the WebGL context. I’m very new to WebGL, graphics and rendering…
What is causing my Canvas element to overflow and what can I do to fix it?
I have a problem with sizing my canvas element properly. The result as seen below is a canvas element (green outline) that extends it’s height outside of it’s parent div. What is causing this problem and what can I do to fix it? HTML: Here is the HTML code, there isn’t much to it. SCSS: The …
Get coordinates of the points in an ellipse in HTML5 Canvas
In HTML5 Canvas, I know I can draw an ellipse with CanvasRenderingContext2D.ellipse(), but how can I draw some points on the ellipse path? I can draw points on a circular path using the following codes: p.s. ignore the colors and the dot at the center. But how to do this with an ellipse? I don’t want to…