I have an interface where I can draw a picture. I have a machine learning model that can recognize this image. What I want? After clicking on the button “Recognize” I want to send the output from a machine learning model to an external interface i.e. a text field WITHOUT REFRESHING THE PAGE. Before pressing the button “Recognize” After pressing
Tag: canvas
Memory Leak when Drawing Video to Canvas using requestAnimationFrame
I am trying to do a dual monitor screen recording by combining screen1 and screen2 in Canvas. I am using vue and electron to do this. But I always got a memory leak, after I troubleshoot my code and narrow the problem. I found that this simple code causes a memory leak, but until now I could not find out
JS remove event listener with no condition?
I have the following code As you can see the resize event listener recursively calls setSize(). I did this so that I could handle initial size setup and window resizing in the same function. The problem is that every recurse will add an additional eventListener, rather than replacing the last. So I need to remove the resize event listener on
Load SVG into canvas to get base64 dataurl
I have this SVG in my html : the symbol pointed by the “use” tag is : This display correctly when the page load (ie. it is using the symbol that I refer to using use tag). I want to take this SVG and get the base64 dataurl (convert it to an image). I tried to use this code without
Detecting element inside a and styling
I got some trouble with a canvas. I’ve created a bunch of words moving inside the element and I want to change the style of a single word on click. Th click function works great but: if I try to stop and scale the word the script works fine; if I try to change the color of the text it
Calculating the correct gap between custom cursor
I’m having an issue where I’m trying to create a custom cursor/crosshair within my canvas. The issue I have is the specified Length, Width, and Gap given to the four rectangles to form the cursor is producing the incorrect amount of pixels for the center gap. Live CodeSandbox: https://codesandbox.io/s/nifty-resonance-bcl0m In the above example, measuring the cursors Length and Width is
Canvas API implementation
I recently started to learn a bit about how javascript work under the hood, and came to know that (in the context of chrome) v8 engine and web APIs are different. Here’s some questions I have regarding the canvas API specifically: Why do we need to use getImageData() every time we want to access the pixels of a given canvas?
Why is canvas messing with my image’s colors?
I’m developing an app that has a painting feature. The user can paint on an image that is initially made of only pure black and pure white pixels. Later, after the user has finished painting, I need to do some processing on that image based on the colors of each pixel. However, I realized that by the time I processed
Create a curve with degree between two lines intersection
I want to make a maple leaf like in the canadian’s flag,but I have a problem to create a curve when the lines intersect so that the curve is only in the intersection and create certain degree between the lines. what I mean is shown in arc A,B,C,etc in the picture I bring down here: canada flag curve This is
Node.js Canvas image overlapping issue / canvas is creating image on top of previous image
I’m having an issue with Canvas when trying to create a generated collection of .png images. I can create the .png files fine but the first image or the image before is not being cleared. index.js config.js The code is working fine and I’m able to create 10 .png files. From the images above you can see the blue hat