cs61b Project0:NBody Simulation

1.Planet.java代码

public class Planet{
    public double xxPos;
    public double yyPos;
    public double xxVel;
    public double yyVel;
    public double mass;
    public String imgFileName;
    private static final double G = 6.67e-11;
    public Planet(double xP,double yP,double xV,double yV,double m,String img){
        xxPos = xP;
        yyPos = yP;
        xxVel = xV;
        yyVel = yV;
        mass = m;
        imgFileName = img; 
    }
    public Planet(Planet p){
        this(p.xxPos,p.yyPos,p.xxVel,p.yyVel,p.mass,p.imgFileName);
    }

    public double calcDistance(Planet p){
        return Math.pow((Math.pow((this.xxPos-p.xxPos),2)+Math.pow((this.yyPos-p.yyPos),2)),1.0/2);
    }

    public double calcForceExertedBy(Planet p){
        return (this.mass*p.mass*G)/Math.pow(this.calcDistance(p),2);

    }

    public double calcForceExertedByX(Planet p){
        return this.calcForceExertedBy(p)*(p.xxPos-this.xxPos)/this.calcDistance(p);
    }

    public double calcForceExertedByY(Planet p){
        return this.calcForceExertedBy(p)*(p.yyPos-this.yyPos)/this.calcDistance(p);
    }

    public double calcNetForceExertedByX(Planet[] p){
        double NetExertedByX=0;
        for(int i=0;i

2.NBody.java代码

public class NBody{

    public static double readRadius(String path){
        In in =new In(path);
        int firstinteger=in.readInt();
        double ReadRadius=in.readDouble();
        return ReadRadius;
    }

    public static Planet[] readPlanets(String path){
        In in=new In(path);
        int numbersum=in.readInt();        
        Planet[] p =new Planet[numbersum];
        double ReadRadius=in.readDouble();
        
        for(int i=0;i