我是 Processing 和 p5.js 的新手，正在嘗試將此代碼從 Processing 轉換為 p5，但沒有成功。我遇到的主要問題是第 21 和 26 行的 ArrayList，以及 ParticleSystem 類中的函數。注意：我知道這可能是一個非常菜鳥的問題，但是我已經嘗試了很多方法，但似乎沒有任何效果，因此我向你們尋求幫助。這是工作處理代碼：ParticleSystem ps;void setup() { size(1200, 800); ps = new ParticleSystem(new PVector(width/2, 50)); for (int i=0; i<1200; i++) { ps.addParticle(); }}void draw() { background(255); ps.move_away_from(mouseX, mouseY); ps.run();}class ParticleSystem { ArrayList<Particle> particles; PVector origin; ParticleSystem(PVector position) { origin = position.copy(); particles = new ArrayList<Particle>(); } void addParticle() { particles.add(new Particle(origin)); } void run() { for (int i = particles.size()-1; i >= 0; i--) { Particle p = particles.get(i); p.run(); // if (p.isDead()) { // particles.remove(i); // } } } void move_away_from( float x, float y){ for(Particle p : particles){ float d = dist(x,y,p.position.x, p.position.y); if( d < 200 ){ p.velocity.x += map(d,0,200,0.5,0.1)*(p.position.x - x); p.velocity.y += map(d,0,200,0.5,0.1)*(p.position.y - y); } } }}class Particle { PVector position; PVector velocity; PVector acceleration; PVector home; Particle(PVector l) { acceleration = new PVector(0, 0); velocity = new PVector(0,0);//random(-0.0001, 0.00001), random(-0.001, 0.0001)); l=new PVector(random(0, 1200), random(0, 800)); position = l.copy(); home = position.copy(); } void run() { update(); display(); }因此，如果有人有解決方案或可以告訴我我需要采取的步驟，請告訴我！
1 回答
aluckdog
TA貢獻1847條經驗 獲得超7個贊
在 JavaScript 中，您根本不需要像 an 之類的東西ArrayList。JavaScript 數組是動態的。此外，沒有必要聲明屬性。當分配了某些東西時，屬性會自動“創建”。
PVector您可以使用 uss代替對象p5.Vector。Ap5.Vector由createVector. 此外，請閱讀JavaScript 中的類。
看例子：
class Particle {
constructor(l) {
this.acceleration = createVector(0, 0);
this.velocity = createVector(0,0);//random(-0.0001, 0.00001), random(-0.001, 0.0001));
this.position = l ? l.copy() : createVector(Math.random()*1200, Math.random()*1200,);
this.home = this.position.copy();
}
run() {
this.update();
this.display();
}
// Method to update position
update() {
this.acceleration.x = -0.01*(this.position.x - this.home.x);
this.acceleration.y = -0.01*(this.position.y - this.home.y);
this.velocity.add(this.acceleration);
this.velocity.mult(0.9);
this.position.add(this.velocity);
// lifespan -= 1.0;
}
// Method to display
display() {
noStroke();//stroke(255, lifespan);
//fill(255, lifespan);
fill(0);
ellipse(this.position.x, this.position.y, 25, 25);
}
}
class ParticleSystem {
constructor(position) {
this.origin = position.copy();
this.particles = [];
}
addParticle() {
//this.particles.push(new Particle(this.origin));
this.particles.push(new Particle());
}
run() {
for (let i = this.particles.length-1; i >= 0; i--) {
this.particles[i].run();
// if (p.isDead()) {
// particles.remove(i);
// }
}
}
move_away_from(x, y){
for (let i = 0; i < this.particles.length; i++) {
let p = this.particles[i];
let d = dist(x,y, p.position.x, p.position.y);
if( d < 200 ){
p.velocity.x += map(d,0,200,0.5,0.1)*(p.position.x - x);
p.velocity.y += map(d,0,200,0.5,0.1)*(p.position.y - y);
}
}
}
}
var ps;
function setup() {
createCanvas(1200, 800);
ps = new ParticleSystem(createVector(width/2, 50));
for (var i=0; i<1200; i++) {
ps.addParticle();
}
}
function draw() {
background(255);
ps.move_away_from(mouseX, mouseY);
ps.run();
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.9.0/p5.js"></script>