Foreword Some time ago, I found a fun website when SURFING the Internet, such as https://upuptoyou.com/. What is interesting is that WHEN I choose play,...
Prototype objects and prototype chains are not used explicitly in front-end work, but they are also used implicitly, such as jquery, Vue, etc. __proto__, prototype,...
Create an image object and use createObjectURL to display the image. 2. Display pictures in canvas Calculate the canvas width and height (data:cropperCanvasSize) according to...
In the previous words... One problem here is that img.onload method is needed for drawing, which is asynchronous and requires local service support. Some students...
Canvas's drawing function is coupled with DOM, while OffscreenCanvas decoups DOM and Canvas API. Canvas code can be executed in worker, and resources on main...
Uncaught DOMException: Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported. The request image returns a response header with access-con...
As you can see, this function js does very little computation, only doing some looping in the creation and deletion. The use of createDocumentFragment minimizes...
Some time ago, I encountered a mobile terminal for image clipping, compression, rotation needs. Considering that the fit of the existing wheels was not high,...
Location data is an important information resource connecting the line and the line. It is an important means of data analysis to effectively present the...
There are three difficulties in using Canvas to achieve screenshot function: 1. 2 screenshot animation effect (gray the unselected part, add border to the captured...
The arc (x, y, r, beginAngle endAngle, anticlockwise) : parameters, respectively Center coordinates of starting point, end point of view, whether counterclockwise. The default is...
Recently, I made a requirement to provide several cut diagrams. The front end splices the slice map and the text information returned by the background...
In the business, you often meet the needs of a variety of synthetic pictures, such as sticker synthesis, synthesis of text, adding watermarks, etc., because...
The three processes of View refer to measure, layout and draw. The setMeasuredDimension method sets the measured width of the View, so getDefaultSize returns the...
Online has been discussed the portraits automatic generation is how to implement, some of them are the registered ID the first letter of generated directly,...