Created
June 2, 2018 19:48
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <meta name="viewport" content="width=device-width" /> | |
| <title>Improved</title> | |
| </head> | |
| <body> | |
| <div id="leader" style="height: 40px; width: 40px; background: red; position: absolute; border-radius: 50%"></div> | |
| <script type="module"> | |
| import observeRect from "https://cdn.rawgit.com/BenoitZugmeyer/observe-rect/improve-performances/src/index.js" | |
| function createFollower() { | |
| const follower = document.createElement("div") | |
| follower.style.position = "absolute" | |
| follower.style.width = follower.style.height = "20px" | |
| follower.style.backgroundColor = "blue" | |
| follower.style.borderRadius = "20px" | |
| document.body.appendChild(follower) | |
| const angle = Math.random() * Math.PI * 2 | |
| let observer = observeRect(leader, (rect) => { | |
| follower.style.top = rect.top + rect.height / 2 - 10 + Math.sin(angle) * 50 + 'px' | |
| follower.style.left = rect.left + rect.width / 2 - 10 + Math.cos(angle) * 50 + 'px' | |
| }) | |
| observer.observe() | |
| } | |
| for (let i = 0; i < 100; i += 1) createFollower() | |
| addEventListener('mousemove', (event) => { | |
| leader.style.top = event.clientY - 20 + 'px' | |
| leader.style.left = event.clientX - 20 + 'px' | |
| }) | |
| </script> | |
| </body> | |
| </html> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <meta name="viewport" content="width=device-width" /> | |
| <title>Original</title> | |
| </head> | |
| <body> | |
| <div id="leader" style="height: 40px; width: 40px; background: red; position: absolute; border-radius: 50%"></div> | |
| <script type="module"> | |
| import observeRect from "https://cdn.rawgit.com/reach/observe-rect/a666e4e1/src/index.js" | |
| function createFollower() { | |
| const follower = document.createElement("div") | |
| follower.style.position = "absolute" | |
| follower.style.width = follower.style.height = "20px" | |
| follower.style.backgroundColor = "blue" | |
| follower.style.borderRadius = "20px" | |
| document.body.appendChild(follower) | |
| const angle = Math.random() * Math.PI * 2 | |
| let observer = observeRect(leader, (rect) => { | |
| follower.style.top = rect.top + rect.height / 2 - 10 + Math.sin(angle) * 50 + 'px' | |
| follower.style.left = rect.left + rect.width / 2 - 10 + Math.cos(angle) * 50 + 'px' | |
| }) | |
| observer.observe() | |
| } | |
| for (let i = 0; i < 100; i += 1) createFollower() | |
| addEventListener('mousemove', (event) => { | |
| leader.style.top = event.clientY - 20 + 'px' | |
| leader.style.left = event.clientX - 20 + 'px' | |
| }) | |
| </script> | |
| </body> | |
| </html> |
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