Mobile canvas image editing, hand drawing, writing, similar to the picture editing operation after qq screenshot, are there any ideas or js plug-ins ...

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 , ...

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...

let canvasNode = document.getElementById( canvas ), ctxs = canvasNode.getContext("2d"); console.log(canvasNode) class CircleProgress { constructor(ctxs, width, height, arc) { this.ctx = ctxs ...

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...

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...

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...

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...

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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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 ...

I have no idea after studying it for a long time. No, no, no. ...

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 ...

first take a look at the reference example: press F12 to view the example after opening a mobile phone or computer browser does it seem to zoom out or enlarge the canvas, and then pan? but I can t do that when I actually write it. wants to know w...

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...

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,...

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...

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....

Chrome fonts are bold under Mac, and css can be solved by setting -webkit-font-smoothing: antialiased . but how to set up canvas? ...

the original picture is very clear the code is as follows: ...