due to business needs, 1 needs to scale the images of different sizes to a uniform size, 2 and then put them on canvas, 3 write the required text, 4 synthesize the specified QR code, and provide users to save or forward. you need the following fun...
Today, I wrote an H5 that generates a poster on WeChat, in which a poster needs to get the user s avatar and draw it on canvas. The avatar was obtained, and the attribute crossOrigin = anonymous was added to the picture when loading. There was a pr...
now you need to pass a image object to the drawImage (img,dx,dy) method of canvas for drawing. but the picture it draws by default has a transparent area around it and is filled with white by default. is the image source as follows: : in t...
DWcanvas there is an attempt to adjust the location of canvas and z-index to make him on the picture, but in this way, the hot area of the picture cannot be clicked. want to create a canvas node after clicking in the hot area, but it seems that oth...
1. The designer designed the following graph, which is very similar to the force map, so that it can be implemented on the page, and each circle in the graph can click on the trigger event. 2, my current two ideas: (1) simple and rude html+css. In...
and then realize the painting function on the canvas of the background map, such as drawing a circle and so on. I want to make a rubber Sassafras function, which can remove part of the circle without affecting the background image. How can this be realiz...
canvas draws multiple ball collisions on the canvas. How can I add a click event to the ball? as far as I know, adding an event to the canvas actually gets an area on the canvas to fix an event? Is it true that the ball can not be added if it keeps ch...
the only thing I can think of now is to save the current canvas to an array every time I finish drawing, and then take it out of the array when I undo it ...
to complete the following effect diagram, the move: method cannot achieve the desired automatic movement at the speed shift 2, . ...
write a line chart with native JS, right-angled ones can be written, but now you need to change into a smooth curve, similar to: the inflection point is still at a right angle, is there any god who can provide the next solution ...
< H2 > now there is a strange situation, that is, when I use the Loadmore component, the pull-up load is not performed, only the drop-down refresh is performed. It only executes every time I change the location of the component, but after I refresh it, i...
the project can be started normally using webpack s devServer. After configuring ssr, css @ import reported an error express configuration import @babel polyfill import React from react ; import {renderToString} from react-dom server ; imp...
in styles.scss , variables.scss , variables.scss the variable $jj is defined, and then $jj will report an error variables.scss in testsass.component.scss. $jj : -sharp05c2fc; .jj { background: $jj; } styles.scss @import variables ...
like A where a child component needs to access the parent element, I need to use prop after reading the tutorial, but why not use app.A directly in the child component? ...
ask for devextreme documents ...