101 lines
2.3 KiB
JavaScript
101 lines
2.3 KiB
JavaScript
/**
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* 引力模拟
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*/
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const planets = [];
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const plantsNumber = 10;
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let sun;
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function setup() {
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createCanvas(1728, 972);
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noStroke();
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colorMode(HSB);
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sun = createVector(width / 2, height / 2);
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for (let i = 0; i < plantsNumber; i++) {
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const planet = new Planet(random(width), random(height));
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planet.vel = p5.Vector.random2D();
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planets.push(planet);
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}
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}
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function draw() {
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background(0);
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for (let i = 0; i < plantsNumber; i++) {
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planets[i].update();
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planets[i].drawPath();
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}
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for (let i = 0; i < plantsNumber; i++) {
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planets[i].show();
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}
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fill("#FFFF77");
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circle(sun.x, sun.y, 8);
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}
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class Planet {
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constructor(x, y) {
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this.pos = createVector(x, y);
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this.vel = createVector(0, 0);
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this.acc = createVector(0, 0);
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this.color = color(random(0, 255), 255, 255);
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this.path = [];
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}
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update() {
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this.acc = p5.Vector.sub(sun, this.pos);
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const dist = this.acc.mag() / 10;
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this.acc.normalize().div(dist * dist);
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this.vel.add(this.acc);
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this.pos.add(this.vel);
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this.path.push(this.pos.copy());
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if (this.path.length > 1024) this.path.shift();
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}
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drawPath() {
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push();
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noFill();
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let h = hue(this.color);
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stroke(color(h, 255, 32));
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strokeWeight(1);
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beginShape();
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this.path.forEach((v, i) => {
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vertex(v.x, v.y);
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});
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endShape();
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pop();
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}
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show() {
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push();
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translate(this.pos.x, this.pos.y);
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push();
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rotate(this.vel.heading());
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const vel = this.vel.copy().mult(10);
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vel.limit(50);
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stroke("#007700");
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line(0, 0, vel.mag(), 0);
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line(vel.mag(), 0, vel.mag() - 2, 2);
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line(vel.mag(), 0, vel.mag() - 2, -2);
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pop();
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push();
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rotate(this.acc.heading());
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const dir = this.acc.copy().mult(1000);
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dir.limit(50);
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stroke("#770000");
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line(0, 0, dir.mag(), 0);
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line(dir.mag(), 0, dir.mag() - 2, 2);
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line(dir.mag(), 0, dir.mag() - 2, -2);
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pop();
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noStroke();
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fill(this.color);
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circle(0, 0, 4);
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pop();
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}
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}
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function mouseClicked() {}
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function switchFullscreen() {
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let fs = fullscreen();
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fullscreen(!fs);
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}
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