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javascript - Use canvas to implement electronic signature, position the coordinates of the mouse in the canvas

When trying to use canvas to implement an electronic signature, the coordinates of the mouse in the canvas cannot be accurately obtained. {Code...} Use ev.clientY to obtain the coordinates of the mouse, but canvas.offsetTop obtains the height from the parent element. And canvas is in a form with scr...

巴扎黑 2017-05-16 13:36:00 0  1  735

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中文網(wǎng) 2017-06-13 09:24:08 0  1  1415

javascript - Problems with obtaining mouse coordinates in canvas

I want to create a line drawing effect with the mouse, which is similar to the line drawing function of the drawing board that comes with the window. This requires obtaining the coordinates of the mouse, but I always feel that the coordinates are not obtained accurately. Every time I draw a line on ...

過去多啦不再A夢 2017-05-19 10:29:32 0  1  685

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  854

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...

僅有的幸福 2017-06-07 09:24:40 0  1  1017

Why is my drawing canvas offset within the page?

It's hard to explain. But I'll try, the whole canvas is offset. I'm not sure how this happened or how to fix it. Like when your mouse is in the top left corner of the page and you start from the center, it matches the top left corner of the canvas element itself. Use code snippets to understand what...

P粉475126941 2024-03-28 22:16:10 0  2  473

javascript - canvas crop empty area

I used canvas to make an electronic signature, but there was too much space left after the user signed. Is there any way to capture the blank space? Original picture of the example: During the signing process, I obtained the area that the mouse passed through, and thus obtained the coordinates of th...

黃舟 2017-05-16 13:26:16 0  5  1228

javascript - JS event bubbling problem

Case closed: Use CSS to achieve this effect. Thanks for your help, I switched to using CSS to realize this effect. 1. In the following code, I listened to the mouseover and mouseout events of the a tag to trigger the canvas animation, and prevented the event from bubbling in the callbacks of mouseov...

學(xué)習(xí)ing 2017-06-12 09:32:56 0  3  906

The start and end points of the image

I'm trying to set the start and end points of an image. So I have my canvas and an image and when I put the image into the canvas I want it to light up a little red circle when I hover over the start/end points which means I can create with other images connect. For example: 1) Drag the image. 2) Pl...

P粉511757848 2023-08-31 12:24:51 0  1  703

Front-end - git for windows (2.6.1) cannot select content

][3] As shown in the picture above, left-click the mouse to select content. Release it after selection, and ^C will appear and then a new line will appear. This means that the selection function cannot be used. Generally, in our cmd window, we can mark-select content-select copy in editing. But this...

某草草 2017-05-02 09:25:57 0  2  693

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  1261

NumberInput mouse wheel handling ignores capture phase event filtering

Very short version: I'm a bit stuck and don't quite understand why this code does indeed intercept and prevent mouse wheel events from being interpreted by the number editor to change numbers. I want to understand why intercept capture and filter events are not working: HTML code: <pid="p-nu...

P粉318928159 2024-04-05 12:21:04 0  1  1906

CSS continuous animation

I have the following CSS code; the problem is that the animation works the way I want it, but resets after the 10 seconds is up, which looks ugly. Ideally I'd like to have an infinite animation that, instead of restarting, wraps the image and when the left side of the image goes out of the canvas, c...

P粉928591383 2024-03-20 12:30:42 0  1  638

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  591

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  1389

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  2943

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  1172

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  1187

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  1141

How to install php7

我無限黑暗里的小太陽▼ 2017-10-11 09:11:44 0  1  1145