Sample code for implementing Fibonacci spiral in p5.js

This article mainly introduces the sample code for implementing Fibonacci spiral in p5.js. Now I share it with you and give it as a reference.

This article mainly introduces the sample code of p5.js to implement Fibonacci spiral, share it with everyone, and make a note for yourself

The effect is as follows:

Main method

1. ##translate()

##rotate()
arc()

Fibonacci Spiral

Fibonacci spiral is also called the "golden spiral", which is based on The spiral curve drawn by the Fibonacci numbers is a 90-degree fan-shape drawn in a square with Fibonacci numbers as sides. The connected arcs are the Fibonacci spirals.

Sketch

Process Decomposition

1. Define an empty Fibo Naqi array:

var Fibonacci = [];

2. Initialization

By default, the draw() function will be infinite To repeat drawing, the frameRate() function can set the number of times to repeat drawing per second, just like the number of frames per second in a movie.

function setup(){
 createCanvas(windowWidth, windowHeight);//创建一块画板，画板的宽高与浏览器宽高相同
 background(255);//设置背景颜色为白色
 frameRate(10);//设置每秒10帧
}

3. Set the style of Fibonacci spiral

function draw(){
 ...
 stroke(0);//线条颜色为黑色
 noFill();//无填充色
 strokeWeight(5);//线条宽度为5
 translate(windowWidth/2, windowHeight/2);//将坐标系移动到页面中央
 ...
}

4. Start drawing the Fibonacci spiral

function draw(){
 ...
 stroke(0);
 noFill();
 strokeWeight(5);
 translate(windowWidth/2, windowHeight/2);
 ...
 for( var i = 0; i < 20; i ++){//绘制20段90度弧线
  var a = i <= 1 ? 1 : Fibonacci[i-1] + Fibonacci[i-2];
//这是条件表达式，如果i等于0或1，那么a等于1；否则等于斐波那契数列前两项的和
  Fibonacci.push(a);//将新得到的a加入斐波那契数列中
  arc(0,0,a * 2,a * 2,0,PI / 2);//绘制圆心在(0,0)直径为2*a度数为90度的弧形

  /**********以下是为下一段弧线做准备************/
  rotate(PI / 2);//将坐标系按顺时针旋转90度
  translate(-Fibonacci[i-1],0); //将坐标系沿着X轴反向移动上一项的长度
 } 
}

5. Let the Fibonacci spiral move Get up

function draw(){
 background(255);//将背景设置成白色，“遮盖”之前的绘图
 stroke(0);
 noFill();
 strokeWeight(5);
 translate(windowWidth/2, windowHeight/2);
 rotate(-PI / 6 * frameCount);//每帧旋转30度，frameCount表示当前已播放帧数
 for( var i = 0; i < 20; i ++){
  var a = i <= 1 ? 1 : Fibonacci[i-1] + Fibonacci[i-2];
  Fibonacci.push(a);
  arc(0,0,a * 2,a * 2,0,PI / 2);
  rotate(PI / 2);
  translate(-Fibonacci[i-1],0); 
 } 
}

Full code

var Fibonacci = [];

function setup(){
 createCanvas(windowWidth, windowHeight);
 background(255);
 frameRate(10);
}

function draw(){
 background(255);
 stroke(0);
 noFill();
 strokeWeight(5);
 translate(windowWidth/2, windowHeight/2);
 rotate(-PI / 6 * frameCount);
 for( var i = 0; i < 20; i ++){
  var a = i <= 1 ? 1 : Fibonacci[i-1] + Fibonacci[i-2];
  Fibonacci.push(a);
  arc(0,0,a * 2,a * 2,0,PI / 2);
  rotate(PI / 2);
  translate(-Fibonacci[i-1],0); 
 } 
}

function windowResized(){
 resizeCanvas(windowWidth, windowHeight);
}

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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