在处理中填充对象数组-所有对象都相同

如何解决在处理中填充对象数组-所有对象都相同

我向您保证，我已经花了数小时试图在互联网上找到解决方案，但是我迫切需要一双新的眼睛。我目前正在使用ArrayLists，但是尝试使用普通的对象数组，并且发生了相同的问题。就上下文而言，我试图模拟一种流行病，并试图在社区边界内以随机位置填充“ Person”类型的数组。目前的Person类如下：

private PVector pos;
class Person{

 public Person(float x,float y){
    pos = new PVector(x,y);
  }
  
  void show(){
    ellipse(pos.x,pos.y,10,10);
  }
  
  float xPos(){
    return pos.x;
  }
  
}

我的社区课程如下：

private float size;
private PVector origin;
private ArrayList<Person> personArr;

class Community{
  
  public Community(float x,float y,float size_){
    origin = new PVector(x,y);
    size = size_;
    
    personArr = new ArrayList<Person>();
  }
  
  void show(){
    
    noFill();
    rect(origin.x,origin.y,size,size);
    
    showPersons();
      
  }
  
  void setupCommunity(){
    
    for(int i = 0; i < initialPopulation; i++){
      
      float x1 = random(origin.x,origin.x + size);
      float y1 = random(origin.y,origin.y + size);
      
      Person person = new Person(x1,y1);
      personArr.add(person);
      
    }
    
  }
  
  void showPersons(){
    for(int i = 0; i < personArr.size(); i++){
      personArr.get(i).show();
    }
  }
  
}

针对社区的show（）方法在我的主Simulation类中的draw（）方法中的每一帧都被调用一次，到目前为止，作为参考，它看起来像这样：

Grapher graphInfected,graphSuseptible,graphRemoved;
Community community;

float graphLength = 250;
float communitySize;
int initialPopulation = 25,population;
int populationInfected = 2,populationSusceptible = 23,populationRemoved = 0;

public void settings(){
  size(1700,1000);
   communitySize = height * 0.8;
}

void setup(){
  population = initialPopulation;
  
  community = new Community(150,100,communitySize);
  
  community.setupCommunity();
  
  graphInfected = new Grapher(width/2 + 240 + 200,height/2 - 230,"Infected",graphLength);
  graphSuseptible = new Grapher(width/2 + 240 + 200,height/2 + 90,"Suseptible",graphLength);
  graphRemoved = new Grapher(width/2 + 240 + 200,height/2 + 400,"Removed",graphLength);
  
}

void draw(){
  
  background(255);
  
  community.show();
  
  graphInfected.addToArray(populationInfected);
  graphSuseptible.addToArray(populationSusceptible);
  graphRemoved.addToArray(populationRemoved);
  
  graphInfected.show();
  graphSuseptible.show();
  graphRemoved.show();

}

这个想法是将所有人显示在社区矩形内的Persons数组中，这看起来像1个人，因为他们都被绘制在同一位置。我知道这一点是因为在调试时，我看到在社区设置中添加到personArr时，随机位置是不同的，但是每次我添加到数组列表时，整个列表中都填充了完全相同的Person。这样就形成了由创建的最后一个人组成的整个列表。如果有人知道原因，我将不胜感激！我只需要用个人Person对象填充列表！谢谢

如果您想尝试运行该项目，以下是绘图仪的代码：

class Grapher {
  private IntList population;
  private int countArr = 1,dataLength = 0;
  private PVector[] linePos;
  private PVector origin;
  private String graphType = "";
  private float length;
  private String yLable = "";
  
  Grapher(int x,int y,String graphType,float length){
    
    origin = new PVector(x,y);
    population = new IntList();
    this.graphType = graphType;
    this.length = length;
    
    population.set(0,initialPopulation);
    
  }

  //Called every every frame
  void show() {

    dataLength = population.size();
    linePos = new PVector[dataLength];
    
    //background(255,255,255);

    int largestPop = initialPopulation;

    for (int i = 0; i < dataLength; i++) {
      if (population.get(i) > largestPop) {
        largestPop = population.get(i);
      }
    }

    //UI code
    stroke(0,0);
    line(origin.x,origin.x + (int) length,origin.y);

    fill(0);
    textSize(15);
    text("" + largestPop,origin.x - 60,origin.y - length);
    text("" + dataLength,origin.x + length,origin.y + 25);

    fill(0);
    textSize(15);
    text("Time",(float) (origin.x  + length/2 - length/10),origin.y + 30);
    text(yLable,origin.x - 100,(float) (origin.y - length/2));

    //Calculating the graph points
    line(origin.x,origin.x,origin.y - (int) length);

    double yInterval = length/(largestPop);
    double interval = length/dataLength;

    for (int i = 0; i < dataLength; i++) {

      float xPos = origin.x + (float) interval * i;
      float yPos = origin.y  - ((float) yInterval * (population.get(i)));

      linePos[i] = new PVector(xPos,yPos);

      //ellipse(xPos,yPos,5,5);
    }

    //Picking the graph colour
    if(graphType.equalsIgnoreCase("Infected")){
      stroke(255,0);
      yLable = "Infected";
    }else if(graphType.equalsIgnoreCase("Susceptible")){
      stroke(0,255);
      yLable = "Susceptible";
    }else{
      stroke(0,0);
      yLable = "Removed";
    }

    //Drawing the graph and connecting the points
    for (int i = 0; i < dataLength - 1; i++) {
      line(linePos[i].x,linePos[i].y,linePos[i + 1].x,linePos[i + 1].y);
    }
  }
  
  void addToArray(int population){
    this.population.set(countArr,population);
    countArr++;
  }
}

解决方法

PVector pos放在Person类之外。因此，所有Person对象都使用相同的pos。

与“社区”类相同。如果您创建多个社区，可能会导致奇怪的错误。