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javascript - How to adjust the position of the canvas tag in h5 to be different after hiding and displaying it again?

I used the canvas tag dynamically added by js to draw some lines, and used absolute positioning at a specific location. It is displayed by default, but the product requires that it can be hidden, so I made a button that can be hidden or displayed after clicking it. Use hide () and show(), why show()...

巴扎黑 2017-05-24 11:37:35

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

Can PDF files run HTML5 and Javascript?

I have a stupid idea to try and make a program that won't be blocked on any computer since it will be embedded in a PDF (I heard Javascript can run in PDFs). It will run HTML5 and Javascript (and a little bit of CSS) in PDF files, mainly using the canvas element in HTML5 and WebGL in Javascript. Is ...

P粉113938880 2024-04-05 12:57:00

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

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

A method to dynamically render circular sectors without using HTML5 canvas

I'm making a fortune wheel and I need to create a wheel or circle based on the number of sectors and fill it with prize names. I've completed the code for a circle with a fixed number of sectors. Here is an example of a circle containing 6 sectors. .wheel_container{position:relative;--wheel-size:360...

P粉731861241 2023-09-02 10:43:07

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