Sine Cosine
Linear movement with sin() and cos(). Numbers between 0 and 2π (2π which angles roughly 6.28) are put into these functions and numbers between -1 and 1 are returned. These values are then scaled to produce larger movements.
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let angle1 = 0;
let angle2 = 0;
let scalar = 70;
function setup() {
createCanvas(710, 400);
noStroke();
rectMode(CENTER);
}
function draw() {
background(0);
let ang1 = radians(angle1);
let ang2 = radians(angle2);
let x1 = width / 2 + scalar * cos(ang1);
let x2 = width / 2 + scalar * cos(ang2);
let y1 = height / 2 + scalar * sin(ang1);
let y2 = height / 2 + scalar * sin(ang2);
fill(255);
rect(width * 0.5, height * 0.5, 140, 140);
fill(0, 102, 153);
ellipse(x1, height * 0.5 - 120, scalar, scalar);
ellipse(x2, height * 0.5 + 120, scalar, scalar);
fill(255, 204, 0);
ellipse(width * 0.5 - 120, y1, scalar, scalar);
ellipse(width * 0.5 + 120, y2, scalar, scalar);
angle1 += 2;
angle2 += 3;
}
