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54 lines
2.5 KiB
Markdown
54 lines
2.5 KiB
Markdown
---
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category: tool
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tool: p5
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contributors:
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- ['Amey Bhavsar', 'https://github.com/ameybhavsar24']
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- ['Claudio Busatto', 'https://github.com/cjcbusatto']
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filename: p5.js
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---
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p5.js is a JavaScript library that starts with the original goal of [Processing](http://processing.org"), to make coding accessible for artists, designers, educators, and beginners, and reinterprets this for today's web.
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Since p5 is a JavaScript library, you should learn [Javascript](https://learnxinyminutes.com/docs/javascript/) first.
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```js
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///////////////////////////////////
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// p5.js has two important functions to work with.
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function setup() {
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// the setup function gets executed just once when the window is loaded
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}
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function draw() {
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// the draw function gets called every single frame. This means that for a frameRate(30) it would get called 30 times per second.
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}
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// the following code explains all features
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function setup() {
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createCanvas(640, 480); // creates a new canvas element with 640px as width as 480px as height
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background(128); // changes the background color of the canvas, can accept rgb values like background(100,200,20) else grayscale values like background(0) = black or background(255) = white
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}
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function draw() {
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ellipse(10, 10, 50, 50); // creates a ellipse at the 10px from the left and 10px from the top with width adn height as 50 each, so its basically a circle.
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//remember in p5.js the origin is at the top-left corner of the canvas
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if (mouseIsPressed) {
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// mouseIsPressed is a boolean variable that changes to true if the mouse buttton is pressed down at that instant
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fill(0); // fill refers to the innner color or filling color of whatever shape you are going to draw next
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} else {
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fill(255); // you can give in rgb values like fill(72, 240, 80) to get colors, else a single values determines the grayscale where fill(255) stands for #FFF(white) and fill(0) stands for #000(black)
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}
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ellipse(mouseX, mouseY, 80, 80);
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// mouseX is the x-coordinate of the mouse's current position and mouseY is the y-coordinate of the mouse's current position
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// the above code creates a circle wherever mouse's current position and fills it either black or white based on the mouseIsPressed
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}
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```
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## Further Reading
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- [p5.js | get started](http://p5js.org/get-started/) The official documentation
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- [Code! Programming for Beginners with p5.js - YouTube](https://www.youtube.com/watch?v=yPWkPOfnGsw&vl=en) Introduction and Coding challenges using Processing and p5.js by Coding Train
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