I want to use an array to produce multiple objects with different values-CodePudding

so I am really new to programming in general. Right now I am using processing/Java to do stuff.

Ive got an assignment to program a small video game and I am stuck for a few hours now, kinda frustrated so I decided to try to get help here.

So right now I have made a class called Gesichter where I defined properties and functions. Now I can draw the Object I created by defining the function in my main program, then running it.

problem is... I want to have this object drawn multiple times but with slightly different heights(yPos). I can do it by hand and just rename and readjust the object, then putting it under the draw function. But I have to do it in a more efficient way for the assignment. My teacher said it can be done by using an array but I am at this moment just confused what to do and I am not sure at all how to do it. preferably I would like to have about 20 "Gesichter" with different heights.

Also how do I get to use the whEllipse variable from my class Gesichter in the main program?

Here is the code so far:

Gesichter rot;


void settings(){
  size(700,700);
  
}


void setup(){
  
 rot = new Gesichter(random(-whEllipse,height),random(-whEllipse,height));
  
  
}
 
void draw(){
  background(0);
  rot.paint();
  rot.move();
  
}

so this is my main.

this is the "Gesichter" class so far.

public class Gesichter {


  //Eigenschaften
  float whEllipse= 200;
  float yPos = random(-whEllipse,height);
  float  xPos = random(-whEllipse,height);
  float xSpeed = 4;
  float P = 4;

  Gesichter(float yPos,float  xPos) {
    
    this.yPos = yPos;
    this.xPos = xPos;
    
    yPos = random(-whEllipse,height);
    xPos = random(-whEllipse/2,width);
    
  }

  //Methoden/Funktionen
  void move() {

    xPos  = xSpeed;
    yPos  = (P*sin(radians(xPos)) 1); // 1 macht dass sich das Gesicht langsam runter bewegt.
    if (xPos>= width whEllipse/2) {

      // P = P 1; Maybe falls ich größere Amplitude will

      xPos = -whEllipse/2;
    }
    if (yPos >= height whEllipse/2) {
      yPos = random(-whEllipse, height/2);
      xPos = random(-200, whEllipse/2);
    }
  }
  
  void paint() {

    fill(255, 0, 0);
    circle(xPos, yPos, whEllipse);
  }
}

I hope someone can help me out :// would be so greatful.

CodePudding user response：

This should get you started. You'll have to do something similar in your draw() method.

Gesichter[] rots = new Gesichter[20];

void setup() {
  for (int i = 0; i < rots.length; i  ) {
    rots[i] = new Gesichter(random(-whEllipse, height), random(-whEllipse, height));
  }
}

Regarding your Gesichter constructor: those last two lines are actually useless. You're reassigning the constructor parameters to those new values, essentially throwing them away. It should look like this.

  Gesichter(float yPos, float xPos) {
    
    this.yPos = yPos;
    this.xPos = xPos;
    
  }

Now, I don't know much about German, but... isn't that class a single face? Would Gesicht be more appropriate?

Regarding your whEllipse problem: you need to either pass it in from the outside:

  public Gesichter(float yPos, float xPos, float whEllipse) {
    ...
  }

void setup() {
  for (int i = 0; i < rots.length; i  ) {
    rots[i] = new Gesichter(random(-200, height), random(-200, height), 200);
  }
}

Or make it static and reference it by the class name:

public class Gesichter {
  public static final float WH_ELLIPSE = 200;
  ...
}

void setup() {
  for (int i = 0; i < rots.length; i  ) {
    rots[i] = new Gesichter(random(-Gesichter.WH_ELLIPSE, height), random(-Gesichter.WH_ELLIPSE, height));
  }
}