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‎001_StarField/P5/Star.js

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// Daniel Shiffman
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// http://codingtra.in
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// http://patreon.com/codingtrain
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// Code for: https://youtu.be/17WoOqgXsRM
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function Star() {
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this.x = random(-width, width);
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this.y = random(-height, height);
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this.z = random(width);
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this.pz = this.z;
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this.update = function() {
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this.z = this.z - speed;
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if (this.z < 1) {
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this.z = width;
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this.x = random(-width, width);
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this.y = random(-height, height);
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this.pz = this.z;
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}
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};
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this.show = function() {
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fill(255);
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noStroke();
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var sx = map(this.x / this.z, 0, 1, 0, width);
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var sy = map(this.y / this.z, 0, 1, 0, height);
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var r = map(this.z, 0, width, 16, 0);
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ellipse(sx, sy, r, r);
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var px = map(this.x / this.pz, 0, 1, 0, width);
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var py = map(this.y / this.pz, 0, 1, 0, height);
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this.pz = this.z;
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stroke(255);
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line(px, py, sx, sy);
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};
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}

‎001_StarField/P5/index.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>StarField_p5.js</title>
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<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/lib/p5.min.js"></script>
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<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/lib/addons/p5.sound.min.js"></script>
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<script type="text/javascript" src="sketch.js"></script>
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<script type="text/javascript" src="Star.js"></script>
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<style> body {padding: 0; margin: 0;} canvas {vertical-align: top;} </style>
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</head>
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<body>
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</body>
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</html>

‎001_StarField/P5/sketch.js

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// Daniel Shiffman
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// http://codingtra.in
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// http://patreon.com/codingtrain
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// Code for: https://youtu.be/17WoOqgXsRM
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let stars = [];
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let speed;
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function setup() {
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createCanvas(600, 600);
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for (let i = 0; i < 800; i++) {
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stars[i] = new Star();
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}
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}
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function draw() {
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speed = map(mouseX, 0, width, 0, 50);
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background(0);
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translate(width / 2, height / 2);
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for (let i = 0; i < stars.length; i++) {
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stars[i].update();
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stars[i].show();
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}
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}

‎001_StarField/Processing/CC_001_StarField/CC_001_StarField.pde

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// Daniel Shiffman
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// http://codingtra.in
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// http://patreon.com/codingtrain
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// Code for: https://youtu.be/17WoOqgXsRM
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// I create an array named "stars",
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// it will be filled with 800 elements made with the Star() class.
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Star[] stars = new Star[800];
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// I create a variable "speed", it'll be useful to control the speed of stars.
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float speed;
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void setup() {
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size(600, 600);
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// I fill the array with a for loop;
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// running 800 times, it creates a new star using the Star() class.
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for (int i = 0; i < stars.length; i++) {
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stars[i] = new Star();
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}
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}
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void draw() {
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// i link the value of the speed variable to the mouse position.
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speed = map(mouseX, 0, width, 0, 50);
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background(0);
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// I shift the entire composition,
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// moving its center from the top left corner to the center of the canvas.
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translate(width/2, height/2);
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// I draw each star, running the "update" method to update its position and
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// the "show" method to show it on the canvas.
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for (int i = 0; i < stars.length; i++) {
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stars[i].update();
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stars[i].show();
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}
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}

‎001_StarField/Processing/CC_001_StarField/Star.pde

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// Daniel Shiffman
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// http://codingtra.in
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// http://patreon.com/codingtrain
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// Code for: https://youtu.be/17WoOqgXsRM
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// I create a "Star" Class.
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class Star {
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// I create variables to specify the x and y of each star.
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float x;
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float y;
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// I create "z", a variable I'll use in a formula to modify the stars position.
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float z;
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// I create an other variable to store the previous value of the z variable.
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// (the value of the z variable at the previous frame).
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float pz;
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Star() {
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// I place values in the variables
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x = random(-width/2, width/2);
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// note: height and width are the same: the canvas is a square.
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y = random(-height/2, height/2);
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// note: the z value can't exceed the width/2 (and height/2) value,
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// beacuse I'll use "z" as divisor of the "x" and "y",
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// whose values are also between "0" and "width/2".
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z = random(width/2);
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// I set the previous position of "z" in the same position of "z",
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// which it's like to say that the stars are not moving during the first frame.
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pz = z;
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}
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void update() {
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// In the formula to set the new stars coordinates
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// I'll divide a value for the "z" value and the outcome will be
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// the new x-coordinate and y-coordinate of the star.
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// Which means if I decrease the value of "z" (which is a divisor),
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// the outcome will be bigger.
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// Wich means the more the speed value is bigger, the more the "z" decrease,
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// and the more the x and y coordinates increase.
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// Note: the "z" value is the first value I updated for the new frame.
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z = z - speed;
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// when the "z" value equals to 1, I'm sure the star have passed the
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// borders of the canvas( probably it's already far away from the borders),
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// so i can place it on more time in the canvas, with new x, y and z values.
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// Note: in this way I also avoid a potential division by 0.
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if (z < 1) {
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z = width/2;
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x = random(-width/2, width/2);
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y = random(-height/2, height/2);
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pz = z;
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}
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}
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void show() {
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fill(255);
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noStroke();
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// with theese "map", I get the new star positions
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// the division x / z get a number between 0 and a very high number,
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// we map this number (proportionally to a range of 0 - 1), inside a range of 0 - width/2.
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// In this way we are sure the new coordinates "sx" and "sy" move faster at each frame
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// and which they finish their travel outside of the canvas (they finish when "z" is less than a).
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float sx = map(x / z, 0, 1, 0, width/2);
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float sy = map(y / z, 0, 1, 0, height/2);;
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// I use the z value to increase the star size between a range from 0 to 16.
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float r = map(z, 0, width/2, 16, 0);
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ellipse(sx, sy, r, r);
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// Here i use the "pz" valute to get the previous position of the stars,
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// so I can draw a line from the previous position to the new (current) one.
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float px = map(x / pz, 0, 1, 0, width/2);
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float py = map(y / pz, 0, 1, 0, height/2);
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// Placing here this line of code, I'm sure the "pz" value are updated after the
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// coordinates are already calculated; in this way the "pz" value is always equals
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// to the "z" value of the previous frame.
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pz = z;
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stroke(255);
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line(px, py, sx, sy);
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}
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}

‎002_MengerSponge/P5/box.js

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// Daniel Shiffman
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// http://codingtra.in
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// http://patreon.com/codingtrain
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// Code for this video: https://youtu.be/LG8ZK-rRkXo
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function Box(x, y, z, r) {
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this.pos = createVector(x, y, z);
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this.r = r;
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this.generate = function() {
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let boxes = [];
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for (let x = -1; x < 2; x++) {
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for (let y = -1; y < 2; y++) {
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for (let z = -1; z < 2; z++) {
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let sum = abs(x) + abs(y) + abs(z);
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let newR = this.r / 3;
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if (sum > 1) {
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let b = new Box(
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this.pos.x + x * newR,
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this.pos.y + y * newR,
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this.pos.z + z * newR,
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newR
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);
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boxes.push(b);
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}
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}
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}
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}
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return boxes;
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};
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this.show = function() {
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push();
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translate(this.pos.x, this.pos.y, this.pos.z);
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box(this.r);
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pop();
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};
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}

‎002_MengerSponge/P5/index.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>MengerSponge_p5.js</title>
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<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/lib/p5.min.js"></script>
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<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/lib/addons/p5.sound.min.js"></script>
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<script type="text/javascript" src="sketch.js"></script>
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<script type="text/javascript" src="box.js"></script>
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<style> body {padding: 0; margin: 0;} canvas {vertical-align: top;} </style>
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</head>
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<body>
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</body>
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</html>

‎002_MengerSponge/P5/sketch.js

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// Daniel Shiffman
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// http://codingtra.in
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// http://patreon.com/codingtrain
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// Code for this video: https://youtu.be/LG8ZK-rRkXo
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var a = 0;
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var sponge = [];
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function setup() {
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createCanvas(400, 400, WEBGL);
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// as of p5.js 0.6.0, normal material is no longer the default and
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// has to be explicitly selected.
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normalMaterial();
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// An array of Box objects
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// Star with one
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var b = new Box(0, 0, 0, 200);
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sponge.push(b);
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}
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function mousePressed() {
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// Generate the next set of boxes
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var next = [];
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for (var i = 0; i < sponge.length; i++) {
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var b = sponge[i];
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var newBoxes = b.generate();
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next = next.concat(newBoxes);
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}
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sponge = next;
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}
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function draw() {
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background(51);
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rotateX(a);
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rotateY(a * 0.4);
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rotateZ(a * 0.1);
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// Show what you've got!
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for (var i = 0; i < sponge.length; i++) {
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sponge[i].show();
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}
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a += 0.01;
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}

‎002_MengerSponge/Processing/CC_002_MengerSponge/Box.pde

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// Daniel Shiffman
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// http://codingtra.in
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// http://patreon.com/codingtrain
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// Code for this video: https://youtu.be/LG8ZK-rRkXo
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class Box {
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PVector pos;
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float r;
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Box(float x, float y, float z, float r_) {
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pos = new PVector(x, y, z);
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r = r_;
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}
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ArrayList<Box> generate() {
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ArrayList<Box> boxes = new ArrayList<Box>();
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for (int x = -1; x < 2; x++) {
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for (int y = -1; y < 2; y++) {
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for (int z = -1; z < 2; z++) {
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int sum = abs(x) + abs(y) + abs(z);
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float newR = r/3;
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if (sum > 1) {
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Box b = new Box(pos.x+x*newR, pos.y+ y*newR, pos.z+z*newR, newR);
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boxes.add(b);
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}
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}
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}
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}
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return boxes;
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}
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void show() {
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pushMatrix();
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translate(pos.x, pos.y, pos.z);
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noStroke();
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fill(255);
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box(r);
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popMatrix();
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}
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}

‎002_MengerSponge/Processing/CC_002_MengerSponge/CC_002_MengerSponge.pde

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// Daniel Shiffman
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// http://codingtra.in
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// http://patreon.com/codingtrain
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// Code for this video: https://youtu.be/LG8ZK-rRkXo
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float a = 0;
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ArrayList<Box> sponge;
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void setup() {
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size(400, 400, P3D);
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// An array of Box objects
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sponge = new ArrayList<Box>();
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// Star with one
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Box b = new Box(0, 0, 0, 200);
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sponge.add(b);
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}
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void mousePressed() {
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// Generate the next set of boxes
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ArrayList<Box> next = new ArrayList<Box>();
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for (Box b : sponge) {
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ArrayList<Box> newBoxes = b.generate();
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next.addAll(newBoxes);
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}
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sponge = next;
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}
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void draw() {
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background(51);
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stroke(255);
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noFill();
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lights();
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translate(width/2, height/2);
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rotateX(a);
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rotateY(a*0.4);
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rotateZ(a*0.1);
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// Show what you've got!
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for (Box b : sponge) {
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b.show();
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}
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a += 0.01;
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}

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