p5.js uses the draw() function to make a golden spiral
This time I will show you how to use the draw() function to make a golden spiral in p5.js. What are the precautions for using the draw() function in p5.js to make a golden spiral? Here is a practical case, let’s take a look.
The effect is as follows:
Main method
- ##translate()
- rotate()
- arc()
The Fibonacci spiral is also called the "golden spiral". It is a spiral curve drawn based on the Fibonacci number sequence. Draw a 90-degree fan shape in a square with Fibonacci numbers as sides. The connected arcs are Fibonacci spiral.
Sketch
Process Decomposition
var Fibonacci = [];
By default, the draw() function will repeat drawing infinitely, and the frameRate() function can set the number of repeated drawings per second. , like the number of frames per second a movie plays.
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
}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
...
}
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
}
}
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);
}
}
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);
}
Recommended reading:
How to use Angular component interactionDetailed explanation of the mutual communication function of controllers in AngularjsThe above is the detailed content of p5.js uses the draw() function to make a golden spiral. For more information, please follow other related articles on the PHP Chinese website!
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