p5.js简介

前一段时间偶然了解到一个觉得很好玩儿的东西p5.js,于是就去了解了一下，发现可以自己设计一些有趣的动画效果，设计出来的动画可以放置到页面当中，而且也是简单易学的。

下面是一段官方的介绍：

p5.js是一个以 Processing语言（java的图形化语言）为基础的JavaScript 库，经常用于互联网数据可视化和互动艺术创作。它继承了Processing语言的初衷，通过简单的编程即可表达数字创意

home | p5.js (p5js.org)，这个是p5.js的教程网站，配套的有远程的p5编辑器链接。但是，由于p5的编译器需要翻外网才能使用，因此，为了服务于大多数群众，本篇博客将使用vscode来实现p5.js的动画效果。

使用vscode来在本地跑p5.js的项目

前期准备

1.去vscode扩展里面搜索p5.js，下载下面这几个拓展应用并且下载

2.新建个文件夹，使用快捷键，shift+ctrl+p，快速创建一个 p5 project

3.给自己创建的p5 project 起个项目名字，（这里，我的名字是windMill，因为我们即将要做一个风车动画）

4.此时，我们可以看到默认创建的index.html和sketch.js两个文件

5.点击侧边栏的雪花按钮，可以看到自己在该文件夹下创建的p5 项目，点击运行按钮，可以在vscode自带的浏览器看到运行的情况

当然也可以直接将html使用浏览器打开查看效果，由于在sketch.js里面，有创建画布

function setup() {createCanvas(400, 400);
}
//在js代码中，setup()函数主要用于设置程序初始状态的代码（比如画布大小，刷新频率，色彩模式等等）
//draw()函数主要用户图形绘制的功能代码（色彩填充，绘制图像）

通过F12键进行检查，直接就可以看到有一个400*400的画布

核心代码

sketch.js


function triangleWave(x, t, a, p = 0) {const temp = (x + p) / t * 2const integer = Math.trunc(temp)const fraction = temp - integerif (integer % 2 === 0) {return a * (fraction - 0.5)} else {return a * (0.5 - fraction)}
}const speed = 0.01
const period = 1.5
let t = 0let windmillTower
let windmillFanfunction preload() {windmillTower = loadImage('asset1/windmill_tower.svg')windmillFan = loadImage('asset1/windmill_fan.svg')
}function setup() {createCanvas(500, 500, WEBGL)
}function draw() {background(249, 145, 190)scale(1, 1 - triangleWave(t += speed, period, 0.3))shearX(PI / 12 * triangleWave(t += speed, 2 * period, 1))// rect(-50, -100, 100, 100)image(windmillTower, -50, -100, 100, 100)push()translate(0, -90)rotate(10 * t)image(windmillFan, -50, -50, 100, 100)pop()
}

风车风叶的svg格式代码

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风车塔身svg格式图片代码

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