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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  1038

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 0  1  686

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 0  1  978

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  852

html5 - How to use Canvas technology to create a music score that jumps up and down

I would like to ask how to use canvas technology to create a music score that jumps up and down. It is similar to this picture, with a simple effect of jumping up and down!

PHPz 2017-05-16 13:21:58 0  1  853

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  1159

Laravel Modal does not return data

I don't know why I'm not getting the value from the modal in my Laravel controller. Please check it for me. However, I use the same code for other modes and controllers. It's working and returning the value from the property without any issues. I'm using Laravel8 and php8.1; below is my code. app\Ht...

P粉174151913 2024-03-29 10:31:31 0  1  586

Can I use the automatic generation module of thinkphp5 in Windows 7 system? How to configure and use

明民 2017-10-10 17:04:14 0  2  1379

After installing the PHP toolbox, all the mysql tables in phpstudy that I installed before are gone. What should I do?

After installing the PHP toolbox, all the mysql tables in phpstudy that I installed before are gone. What should I do?

劉袁銘 2017-10-10 19:25:59 0  4  2935

mcrypt_get_key_size()

To use mcrypt_get_key_size() in php study, how to enable mcrypt_

劉袁銘 2017-10-10 19:47:34 0  1  1167

Detecting login status and preventing repeated login status in TP5 - My page is wrong

冥冥之中天注定 2017-10-10 22:49:15 0  0  1180

Issues with resending WeChat public account template messages?

For example: I am using PHP to develop WeChat public accounts. If I send a template message, the WeChat client may receive 1-3 messages. I checked Baidu and said that the WeChat server will resend in 5 seconds. How to solve this problem?

飛揚 2017-10-11 08:00:11 0  0  1137

How to install php7

我無限黑暗里的小太陽▼ 2017-10-11 09:11:44 0  1  1143

Solve (no language limit)

A census taker asked a woman, "How many children do you have and how old are they?" The woman replied, "I have three children. Their ages multiplied is 36. The sum of their ages is equal to the house number of the segregated room." Census The enumerator immediately went to the ne...

路過 2017-10-11 10:20:08 0  1  1359

There is no WWW file in the phpStudy directory. Enter localhost in the website and the hello world solution will come out directly! I created the WWW folder in the root directory and then created an abc.php. localhost/abc.php still didn't come out and an error was reported. not found

<?phpphpinfo();?>

M..moli瞎 2017-10-11 11:45:27 0  7  5206

Find an authoritative and practical development tutorial or article on WeChat scan code authorization to log in to the website

Find an authoritative and practical development tutorial or article on WeChat scan code authorization to log in to the website

極世 2017-10-11 12:33:15 0  1  1681

How to uninstall phpstudy.

whlyx 2017-10-11 15:53:03 0  2  1764

An error warning appears when phpstudy enters the database

Hirtdye 2017-10-11 17:12:35 0  2  1621

Problem with bool value output

<?php//In fact, it can be lowercase, but it is difficult to distinguish, so we stipulate that it is usually uppercase define('xiaoxie',true);echo xiaoxie;$hello=flase;echo $hello;?>Why is the output result of the previous code 1? The subsequent output result is false, shouldn't it be 0?

益?zhèn)?2017-10-11 20:37:54 0  1  1717

PHP source code encryption problem

I just finished writing a website, and the concept of source code encryption has always been vague, and there is very little online information. I would like to know the following questions: 1: There are encryption tools on the Internet. This is easy to understand, but some of them are just function...

按鍵盤手指磨破皮 2017-10-12 01:29:15 0  2  1696