javascript - How to draw multiple balls on canvas so that the background image of each ball is different? Is it possible?

Question: When drawing multiple balls on canvas, how can I make the background image of each ball different? Is it possible? What I want to do now is just make each ball a different color, and I want to fill it with pictures. Part of the code: {code...} Current effect:

大家讲道理 2017-06-14 10:54:28 0  4  1009

Problem with not getting accurate mouse coordinates: using HTML5 canvas when resizing the page

I want to create this pixel effect from a front-end expert. Although I can achieve the entire pixel effect on a full-screen canvas: constcanvas=getElementById('canvas');canvas.height=window.innerHeight;//Set the full-screen height to the canvas canvas.width=window.innerWidth;//Set the canvas to full...

P粉752290033 2023-09-12 12:20:33 0  1  733

html5 - canvas sometimes cannot get toDataURL data

Questions: 1. I don’t know why, canvas sometimes cannot get the drawing data, but only gets “data:;”. Please tell me where I wrote this wrong. 2. I write canvas like this. Is there anything that needs to be optimized? Related code: {code...} {code...}

高洛峰 2017-06-06 09:53:01 0  2  897

Why does every time I save my Vite React project, a new canvas element is added to the page body instead of replacing the existing canvas element?

I'm trying to start learning ThreeJs (I'm also new to Javascript web development). After watching some tutorials, I started with Vite and React, then started with a basic rotating cube. This part works. But from what I've read about vite, saving the file I'm working on should be enough to reload it ...

P粉186904731 2024-03-30 09:57:49 0  1  513

javascript - canvas design mouse drawing function draws multiple parallel colored lines in one stroke

1. The mouse drawing function of canvas design can draw multiple parallel colored lines in one stroke. 2. Tried adding drawing oCg.beginPath(); to the mouse event, but the event will be overwritten. 3. Add a duplicate canvas in the same way, but the canvas is covered.

PHP中文网 2017-06-13 09:24:08 0  1  1269

Canvas appears blank?

I'm trying to render keys onto a canvas that I can get from BlazePose, but I can't seem to get them to draw to the canvas. I know the x and y of each keypoint and are retrieved, but I can't get them to display on the canvas. I've tried changing the style but so far no success. thanks for your help. ...

P粉147045274 2024-03-31 17:20:31 0  1  553

javascript - When the mouse is clicked on the Canvas page, how to determine whether the position of the point is on the line drawn in it? Something triggers an event on a drawn line?

Below are three sections of underlined code. When I enter the editing mode; when I click the left mouse button, the corresponding position of the left button in vcanvas has been recorded. How can I tell if the point I clicked is on the line segment I drew? //This is the underlined key code {code...}

世界只因有你 2017-06-13 09:24:19 0  1  1172

javascript - Help canvas to draw translucent mosaic?

My requirement is to allow users to use the mouse to mosaic the uploaded documents. My idea is to bind mouse events to the canvas and draw a translucent png onto the document along the user's mouse pressing path. Now I don't want to use translucent Png overlay, I want to directly use canvas to gener...

仅有的幸福 2017-06-07 09:24:40 0  1  882

Image storage - php mysql stores base64 images

In the HTML5 canvas, I used a third-party control for making emoticon packages, and now I want to upload the completed emoticon package to the mysql database. Whether you upload it to a local server and then store the file address in the database, or use it in blob form, you can do it. Please tell m...

ringa_lee 2017-05-19 10:07:42 0  4  992

javascript - How to determine the drawn graphics under CANVAS

How do I judge what I am drawing on the canvas? For example, I use lines to draw a heart or a V. . How to determine whether it is heart or V? . And judge the similarity between two people's paintings. The condition can be one stroke, not multiple strokes

PHP中文网 2017-05-16 13:27:54 0  2  665

ctx alternate. Use strokeStyle when using requestAnimationFrame()

I'm trying to implementimplerand mmotion to draw as the background canvas of my homepage but I'm having trouble finding any query colors.

P粉605385621 2023-08-01 16:06:12 0  1  505

javascript-canvas drawing

I wrote a function that calls canvas's drawImage for the first time to draw part of a local picture (it can succeed), and then calls toDataURL to convert the picture drawn by canvas into the src attribute of the image object, and then this Why does the picture drawn on canvas call the same method fo...

PHP中文网 2017-07-05 10:46:27 0  1  759

html5 - How to write the petal scattering effect and how to generate many petals

{Code...} I am writing one by one. It is very frustrating and there cannot be many petals. How can many petals be generated infinitely when there are only a few? Can it be achieved without canvas? Or how can it be achieved with canvas?

我想大声告诉你 2017-06-22 11:53:27 0  3  2051

javascript - Problems with canvas processing images

I need to use canvas to process a picture uploaded by the user. The size uploaded by the user may be very large, for example, it will exceed the width and height of the current browser window, so I scale it proportionally to the visible area of ​​the browser, and then Draw it onto the canvas, but th...

扔个三星炸死你 2017-06-10 09:49:16 0  3  997

Click area of ​​slide arrow is wider than icon

On my WordPress development site, I have a slideshow feature for galleries. When you click on a picture, it starts a slideshow. My problem is my two white arrows, one on the left and one on the right. The clickable area of ​​the arrow is wider than the size of the icon. See pictures below. The click...

P粉195200437 2023-09-13 19:29:50 0  1  617

Chartjs response size

I want to adjust the font size when my character width is smaller. I'm using ChartJs and Line type. When the canvas width is 100% (1500px) I have this: But when I change the canvas size to 50% (750px) I get the following: The text is too small to read and I want the font size not to change . Can thi...

P粉321584263 2023-09-15 13:28:07 0  1  586

javascript - Questions about the jQuery File Upload plug-in

The user uses the input="file" tag to select a picture. After I draw the picture selected by the user to canvas for processing, I get the base64 picture data. Then the question comes, how do I put this result into jQuery File Upload, and then click the button What about uploading? {code......

淡淡烟草味 2017-06-10 09:49:07 0  1  645

javascript - How to achieve pencil line drawing effect on canvas

The line drawings I have done recently are all done with lineto, but the drawings are all solid lines. From the perspective of creative effect, I want to have the effect of drawing a [pencil]~ Dear masters, how to draw it. .

習慣沉默 2017-05-24 11:37:40 0  1  1047

Every 3 elements wrap a parent element

I just want to wrap a div with the slideshow class around every 3 divs with a class for search audio. One error I got was that it said elem.parentElement is undefined... so this part works fine... constaudioBlocks=document.querySelectorAll('.search-audio');constslider=document.querySelector(' .slide...

P粉211273535 2024-04-02 13:11:31 0  2  414

javascript - I made a canvas game. When the map camera zooms in on the map object, the fps is very stuck and the animation is not smooth. How can I solve this problem?

It should be that the css used to enlarge the camera, which is the canvas, will cause instability. What should I do?

女神的闺蜜爱上我 2017-07-05 11:03:02 0  2  950