How to draw a dragon with Div
This article shows you how to use Div to draw a dragon, the content is concise and easy to understand, it can definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.
Disassembly demand
Front-end engineers are miserable when they encounter unreliable product managers and designers. We have a giant cauldron for final delivery, and all deadline feels like it's just for squeezing front-end engineers.
Ah, draw a dragon
What kind of painting, canvas?
Canvas can obtain the pixel lattice of the specified area.
Shit, we have a plan.
Code time
First use image search to find a silhouette of a dragon.
Draw the picture into canvas var canvas = document.getElementById ("canvas"); var ctx = canvas.getContext ("2d"); var image = new Image (); image.src = "dragon.jpg"; image.onload = function () {canvas.width = image.width; canvas.height = image.height; ctx.drawImage (image,0,0);} get and crop the lattice information of the canvas var imageData = ctx.getImageData. Data Ctx.fillStyle = "# ffffff"; ctx.fillRect; var gap = 6; for (var h = 0; h < image.height; h+=gap) {for (var w = 0; w < image.width; w+=gap) {var position = (image.width * h + w) * 4; var r = imageData [position], g = imageData [position + 1], b = imageData [position + 2] If (r+g+b==0) {ctx.fillStyle = "# 000"; ctx.fillRect (wrecoverhpd4);}
Now we have the lattice information of such a dragon.
Generate bubbles from lattice information domvar dragonContainer = document.getElementById ("container"); var dragonScale = 2; for (var h = 0; h < image.height; h+=gap) {for (var w = 0; w < image.width; w+=gap) {var position = (image.width * h + w) * 4; var r = imageData [position], g = imageData [position + 1], b = imageData [position + 2] If (r+g+b==0) {var bubble = document.createElement ("img"); bubble.src = "bubble.png"; bubble.setAttribute ("class", "bubble"); var bubbleSize = Math.random () * 10mm 20; bubble.style.left = (w*dragonScale-bubbleSize/2) + "px" Bubble.style.top = (h*dragonScale-bubbleSize/2) + "px"; bubble.style.width = bubble.style.height = bubbleSize+ "px"; bubble.style.animationDuration = Math.random () * 634 + "s"; dragonContainer.appendChild (bubble);}
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