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This article is to share with you about how html5 uses canvas to achieve mobile painting. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Disclaimer

I'm not going to teach canvas, but I just thought it was fun to take a look at it.

It means to make it a little rough, don't spray me.

Effect.

The number of frames is slightly lower, but it is, of course, much smoother.

Implement HTML:

* {margin: 0 padding: 0;} body {background-color: lightblue;} # canvas {background-color: black;width: 100vw;} / * see below * /

JS:

_ window.onload = function () {let / / canvas ctx = document.getElementById ('canvas'). GetContext (' 2d'), / / canvas size canvas_width = document.getElementById ('canvas'). Width, canvas_height = document.getElementById (' canvas'). Height, / / text color, font, background color of the DVD icon text_color = ['green',' blue', 'purple',' yellow', 'white' 'yellow',' white'], text_font = 'italic bold 50px yahei', background_color = [' red', 'orange',' yellow', 'green',' blue', 'indigo',' violet'], / / the size of the background rectangle background_width = 110, background_height = 50, / / when adding text to the rectangle Height deviation fix_height = 7, / / speed, per redraw movement px speed_x = 0.5, speed_y = 0.5, / / direction of movement, initial 'rmurb' lower right direction = 'rmurb', / / icon x and y coordinates, initial 0 position_x = 0, position_y = 0, / / number of collisions Used to calculate the background and text color count = 0 dvd () function dvd () {/ / moving direction switch (direction) {/ / lower right case'r speed_x position_: position_x + = speed_x position_y + = speed_y break / / upper right case'r color: position_x + = speed_x position_ Y-= speed_y break / / bottom left case'lmurbages: position_x-= speed_x position_y + = speed_y break / / upper left case'lmurtones: position_x-= speed_x position_y-= speed_y break} / / empty canvas ctx.clearRect (0 0, canvas_width, canvas_height) / / redraw ctx.fillRect (position_x, position_y, background_width, background_height) / / collision detection / / bottom if (position_y + background_height > = canvas_height) {direction = direction.replace ('b') Count + = 1} / / right if (position_x + background_width > = canvas_width) {direction = direction.replace ('ringing,' l') count + = 1} / / left if (position_x < 0) {direction = direction.replace ('l') On'r') count + = 1} / / if (position_y < 0) {direction = direction.replace ('tweets,' b') count + = 1} / / text ctx.font = text_font ctx.fillStyle = text_ colorcount [7] ctx.fillText ("DVD", position_x Position_y + background_height-fix_height) / / background color ctx.fillStyle = background_ color [count% 7] / / start animation window.requestAnimationFrame (dvd)}} Thank you for reading! This is the end of this article on "how html5 uses canvas to achieve standby animation". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!

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