v1
9/14/2022 by chenglou -00
Setup JavaScript
function pointsOnEllipse1(cx, cy, rx, ry, n) {
const points = Array(n);
const step = Math.PI / (n / 2);
let sin = 0;
let cos = 1;
const a = Math.cos(step);
const b = Math.sin(step);
for (let i = 0; i < n; i++) {
points[i] = { x: cx + rx * cos, y: cy + ry * sin };
const ts = b * cos + a * sin;
const tc = a * cos - b * sin;
sin = ts;
cos = tc;
}
return points;
}
function pointsOnEllipse2(cx, cy, rx, ry, n) {
const xs = Array(n);
const ys = Array(n);
const step = Math.PI / (n / 2);
let sin = 0;
let cos = 1;
const a = Math.cos(step);
const b = Math.sin(step);
for (let i = 0; i < n; i++) {
xs[i] = cx + rx * cos
ys[i] = cy + ry * sin
const ts = b * cos + a * sin;
const tc = a * cos - b * sin;
sin = ts;
cos = tc;
}
return {xs, ys};
}
ready
let results1 = [];
for (let i = 0; i < 999; i++) {
results1.push(
pointsOnEllipse1(Math.floor(Math.random() * 100), Math.floor(Math.random() * 100), Math.floor(Math.random() * 100), Math.floor(Math.random() * 100), 200)
)
}
let result = 0
for (let i = 0; i < results1.length; i++) {
let r = results1[i]
for (let j = 0; j < r.length; j++) {
result += r[j].x + r[j].y
}
}
console.log(result)
ready
let results2 = [];
for (let i = 0; i < 999; i++) {
results2.push(
pointsOnEllipse2(Math.floor(Math.random() * 100), Math.floor(Math.random() * 100), Math.floor(Math.random() * 100), Math.floor(Math.random() * 100), 200)
)
}
let result = 0
for (let i = 0; i < results2.length; i++) {
let r = results2[i]
for (let j = 0; j < r.xs.length; j++) {
result += r.xs[j] + r.ys[j]
}
}
console.log(result)