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Mobile canvas image editing, hand drawing, writing, similar to the picture editing operation after qq screenshot, is there any idea or js plug-in
Mobile canvas image editing, hand drawing, writing, similar to the picture editing operation after qq screenshot, are there any ideas or js plug-ins ...
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On the problem of drawing Line with Konva
Why doesn t re-setting the points property and then calling the draw method not empty the previous painting?
when clicked, it becomes two lines
$(function() {
const stage = new Konva.Stage({
container: -sharpcontainer ,
...
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Use the html2canvas plug-in to take screenshots from the upper left corner of the screen?
1. Use html2canvas plug-in to take screenshots. When using custom canvas, the desired intercept area is located in the center of the view, but each time the result starts from the upper left corner of the screen .
2. The code is as follows:
var create...
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Write a canvas class with ES6. No canvas image is generated on the page.
let canvasNode = document.getElementById( canvas ),
ctxs = canvasNode.getContext("2d");
console.log(canvasNode)
class CircleProgress {
constructor(ctxs, width, height, arc) {
this.ctx = ctxs
...
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Draw canvas ring loading diagram according to the progress of asynchronously loading JS files
var fileArr = [ js1 , js2 .]
iterate through the fileArr array and insert the script tag into the body tag. At the same time, each JS file is uploaded successfully, an onload interface is exposed, and the upload progress is transferred to canvas t...
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How to make the mouse scrolling sequence frame animation implemented by canvas smooth and flexible?
for example, you can see that some websites use canvas to animate sequence frames of pictures, and some are bound with mouse wheel events, such as http: www.clearmotion.com te..
I tried it myself and found that the scrolling was not smooth. The mouse...
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Problems related to transform operation and hand-drawn trajectory operation after canvas inserts a picture
After canvas inserts a picture, operations such as rotation and magnification need to be carried out, and the track will be recorded by hand on the basis of the operation. The problem is that the rotation and magnification operation will change the ori...
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The web mobile compresses the uploaded avatar image. When the image is too large, the compression is not successful, but there is no error.
I have been doing the function of uploading avatars on mobile in the past two days. I want to compress and upload images larger than 400kb. Images larger than 400kb have not been successfully compressed and no errors have been reported. Later, I re-read...
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How does js canvas compress pictures?
the requirement is to implement compressed upload. Most of them are realized by canvas method on the Internet, so I wrote one after it. But it doesn t seem to work. After uploading, the downloaded picture is still very large. the code is as follows
...
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Create a news or on-screen comment with canvas, including pictures and text
recently, there is a demand that the on-screen comment cycle shows the winning situation of the user, each piece of data including pictures and text, which boss has done it, urgent request, thank you very much ...
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Mini Program uses the canvas artboard to realize the user's online electronic signature. As long as you draw in the artboard, the page cannot be scrolled.
...
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How to draw Antenna pattern (radiation pattern) with js
background and requirements
recently encountered a demand to draw antenna pattern (also known as lobe pattern, radiation pattern or beam pattern) on the web side. see ...
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How is the animation effect of Tencent Cloud's banner diagram realized?
I have no idea after studying it for a long time. No, no, no.
...
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To find a way to realize the animation effect of scrolling at the front end.
you need to achieve an animation effect similar to the iPhone X home page of Apple s official website, that is, the scroll bar gradually enlarges a picture and continues to scroll to show the text. The canvas, used on Apple s official website does not ...
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IE browser failed to clear canvas canvas
use canvas to draw the image first
locate several div, on the image to trigger events
when an event is triggered, the box and connection of the message description are displayed
div, is not affected by the frame of information description
conne...
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In canvas, using isPointInPath to change the shape of the cursor only works on part of the path. Solve
found a section of code for drawing k-diagram from the Internet and changed it, and found that the effect is a little different from what you expected. Please take a look at
.
according to reason, as long as the mouse is moved into the drawing path,...
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When canvas is converted to png, sometimes you get an all-black picture.
when I use toDataUrl () to convert canvas to png, sometimes I get an all-black picture, but the amazing thing is that sometimes the picture is normal, does anyone know what s going on?
"stage" canvas
const canvas = document.querySelec...
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When canvas sets up online pictures, it prompts that the canvas is contaminated, and setting crossOrigin is cross-domain.
Local pictures are fine. Online pictures will prompt the canvas to be contaminated. If you see what they say, setting crossOrigin will prompt the picture to cross-domain. is there any advice that has been solved?
canvas = this.mycanvas;
ctx = canvas....
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How to set the FontSmoothing? of CSS by canvas
Chrome fonts are bold under Mac, and css can be solved by setting -webkit-font-smoothing: antialiased . but how to set up canvas?
...
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Why is the picture referenced by the pixi.js wizard blurry and unclear?
the original picture is very clear
the code is as follows:
...