137 lines
2.6 KiB
JavaScript
137 lines
2.6 KiB
JavaScript
let charges = [];
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let sphere_mode = 'circles';
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let sphere_radius = 200;
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let physics = false;
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function preload() {
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earth = loadImage("atlas1.jpg");
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}
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function setup() {
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createCanvas(600, 600, WEBGL);
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}
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function draw() {
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orbitControl();
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background(50);
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make_lights();
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if (physics) {
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move_charges(charges);
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}
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draw_charges(sphere_radius);
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draw_sphere(sphere_radius, 25);
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}
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function make_charges(n) {
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charges = [];
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for (let i = 0; i < n; i += 1) {
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let position;
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if (i === 0) {
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position = createVector(0, -1, 0);
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} else {
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const lat = random(-TAU / 4, TAU / 4);
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const lon = random(0, TAU);
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position = createVector(
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cos(lat) * cos(lon),
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sin(lat),
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cos(lat) * sin(lon),
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);
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}
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charges.push({
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position: position,
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velocity: createVector(),
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acceleration: createVector(),
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});
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}
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}
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function draw_charges(radius) {
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push();
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noStroke();
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ambientMaterial(0xbf, 0x00, 0x00);
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for (let charge of charges.values()) {
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let position = charge.position.copy();
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position.mult(radius);
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push();
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translate(position.x, position.y, position.z);
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sphere(15);
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pop();
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}
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pop();
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}
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function draw_sphere(radius, n_axis_circles) {
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stroke(0x3f);
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noFill();
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push();
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rotateX(TAU / 4);
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draw_circles(
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radius,
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sphere_mode === 'earth' ? 2 : n_axis_circles,
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color(0x00, 0x9f, 0xff),
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color(0xff, 0x9f, 0x00),
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);
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pop();
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push();
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rotateY(TAU / 4);
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draw_circles(
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radius,
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sphere_mode === 'earth' ? 2 : n_axis_circles,
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color(0xff, 0x00, 0xff),
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color(0x00, 0xff, 0x00),
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);
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pop();
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if (sphere_mode === 'earth') {
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noStroke();
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noFill();
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tint(0xff, 0x9f);
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texture(earth);
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push();
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rotateY(TAU / 4);
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sphere(radius);
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pop();
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}
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}
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function draw_circles(radius, n_circles, pole_1_color, pole_2_color) {
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push();
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stroke(pole_1_color);
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translate(0, 0, -radius);
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point(0, 0);
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pop();
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for (let i = 1; i < n_circles; i += 1) {
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const angle = map(i, 0, n_circles - 1, -TAU / 4, TAU / 4);
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const circle_radius = radius * cos(angle);
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push();
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translate(0, 0, radius * sin(angle));
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circle(0, 0, circle_radius * 2);
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pop();
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}
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push();
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stroke(pole_2_color);
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translate(0, 0, radius);
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point(0, 0);
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pop();
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}
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function make_lights() {
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let light = createVector(0, 1, -1);
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light.normalize();
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directionalLight(0x1f, 0x1f, 0x1f, light);
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ambientLight(0xbf);
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}
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function keyPressed() {
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if (key == 'd') {
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sphere_mode = sphere_mode === 'earth' ? 'circles' : 'earth';
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} else if (key == ' ') {
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physics = !physics;
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} else if (key >= '0' && key <= '9') {
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make_charges(int(key));
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}
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}
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