for()

general description, what is it and what is it for

1. Arranging shapes around a circle

There's a simple line of code, that allows us to arrange items around a circle. The variable for the amount of items can be used to divide the circumference into a specified number of equal parts.

// This is a sketch template for the p5diary

color black = #222222;
color white = #eeeeee;
color red = #E14C45;

void setup() {
  rectMode(CENTER);
  size(300, 300); 
  fill(red);
  background(white);
  stroke(black);
  float segmentCount = 14;
  translate(width/2, height/2);
  for (float i = 0; i < segmentCount; i++) {
    rotate(radians(360/segmentCount));
    rect(100, 0, 15, 15);
  }
}

void draw() {
}

Nested for-loops

a grid of triangles

// This is a sketch template for the p5diary

color black = #222222;
color white = #eeeeee;
color red = #E14C45;

void setup(){
 size(300,300); 
 fill(red);
noStroke();
 for (int i = 0; i < width; i = i+5) {
    for (int j = 0; j < height; j = j+5) {
      pushMatrix();
      translate(i,j);
      triangle(0,0,0,5,5,5);
      popMatrix();  
    }
  }
}

void draw(){
gif(1,1);
}