How to reference a variable inside a class?

PhiLho

Re: How to reference a variable inside a class?

11 months ago

class C
{
int score;
}

void setup()
{
C c = new C();
c.score++;
println(c.score);
}

cameocream

Re: How to reference a variable inside a class?

11 months ago

I'm not sure if this would work for my code....

    class Missile {
      float endX;     // End X position
      float endY;     // End Y position
      float endvarX; // Line gradient X
      float endvarY; // Line gradient Y
      float startX;   // Start of missile line
      float startY;   // start of missile line
      float score;
      float speed;

      color c;
      Missile(float init_endvarX, float init_endvarY, float init_startX, float init_startY,
      color init_c, float init_score, float init_speed)
      {
        endX = init_startX;
        endY = init_startY;
        endvarX = init_endvarX;
        endvarY = init_endvarY;
        startX = init_startX;
        startY = init_startY;
        c = init_c;
        score = init_score + init_speed;
        speed = init_endvarY;
      }

      void render() {
        {
        smooth();
        stroke(c);
        strokeWeight(2.5);
        line(startX, startY, endX, endY);
        }
      }


      void update() {


        endY = endY + endvarY;
        endX = endX + endvarX;
        speed = endvarY + 100;
        score = score + speed;

        if (dist(endX, endY, posX, posY) <= 10){
          endX = 1000;
          endY = 1000;
          startX = 1000;
          startY = 1000;
          posX = 1000;
          posY = 1000;

          // ^ Causes the object to 'Disappear' to 'explode'
        // missilelist.remove(randomMissile());
      }
      // Hit dectection for the first shields of city bases.
      if (dist(endX, endY, circle1, circle2) <= 55){
        Green = color(255, 0, 0);
        endX = 1000;
        endY = 1000;
        circle1 = 1000;
        circle2 = 1000;
      }

      if (dist(endX, endY, circle3, circle4) <= 55){
        Green1 = color(255, 0, 0);
        endX = 1000;
        endY = 1000;
        circle3 = 1000;
        circle4 = 1000;
      }

      if (dist(endX, endY, circle5, circle6) <= 55){
        Green2 = color(255, 0, 0);
        endX = 1000;
        endY = 1000;
        circle5 = 1000;
        circle6 = 1000;
      }

      if (dist(endX, endY, circle7, circle8) <= 55){
        Green3 = color(255, 0, 0);
        endX = 1000;
        endY = 1000;
        circle7 = 1000;
        circle8 = 1000;
      }

    // hit detection for second shield of city bases
       if (dist(endX, endY, circle9, circle10) <= 40){
        endX = 1000;
        endY = 1000;
        circle9 = 1000;
        circle10 = 1000;
      }

       if (dist(endX, endY, circle11, circle12) <= 40){
        endX = 1000;
        endY = 1000;
        circle11 = 1000;
        circle12 = 1000;
      }

       if (dist(endX, endY, circle13, circle14) <= 40){
        endX = 1000;
        endY = 1000;
        circle13 = 1000;
        circle14 = 1000;
      }

       if (dist(endX, endY, circle15, circle16) <= 40){
        endX = 1000;
        endY = 1000;
        circle15 = 1000;
        circle16 = 1000;
       }
    }
   }// class Missile
int framestore; // frame last missile was created on
int Mdelay;      //delay between next fire time
int Mdelay2;     // Difficulty increase
int posX;        //mouse X position of player
int posY;        //mouse Y position of player
float fireX;     //starting X co-ordinate of player missile
int fireY;       //starting Y co-ordinate of player missile

float endvarY = random(0.5, 3.3);
float speed = endvarY;
float score;

// Circle/base variables for first sheild of cities:
int circle1 = 255;
int circle2 = 500;
int circle3 = 110;
int circle4 = 500;
int circle5 = 445;
int circle6 = 500;
int circle7 = 590;
int circle8 = 500;

// Circle/base variables for second shield of cities:
int circle9 = 255;
int circle10 = 500;
int circle11 = 110;
int circle12 = 500;
int circle13 = 445;
int circle14 = 500;
int circle15 = 590;
int circle16 = 500;

// Blue colour variables:
int Blue = color(25, 200, 255);
int Blue1 = color(25, 200, 255);
int Blue2 = color(25, 200, 255);
int Blue3 = color(25, 200, 255);

// Green colour variables:
int Green = color(0, 255, 100);
int Green1 = color(0, 255, 100);
int Green2 = color(0, 255, 100);
int Green3 = color(0, 255, 100);

//***************************************************************************

    Missile randomMissile() { // Gives values to the Class Missile.
      return new Missile(random(-2.0, 2.0), random(0.5, 3.3), // Gives the values to endvarX and endvarY, this sets the speed of the Missile
      random (200, 600), 0, // Starting position of each Missile. X value is random. Y value is always 0
      color(random(0, 256), //Gives each missile a random and unique colour
      random(0, 256),
      random(0, 256)), (score+speed), (endvarY)
        );
    }



    ArrayList <Missile> missilelist; // list in null initially

    void setup() {
      size(700, 500);
      framestore = 0;
      Mdelay = (int)random(60, 120); // Missiles will fire between every 60-120 frames
      Mdelay2 =(int)random(60, 150); // Missiles will fire between every 60-150 frames
      missilelist = new ArrayList<Missile>(); // creates and initially empty ArrayList of missile objects
      frameRate(30); //setting the refresh rate of the game
      score = score + speed;

    }

    void reset() {

    }

    void draw() {
      background(255);


      textSize(15);
      text("Score = "+score, 15, 22);

      {

      fill(255, 50, 50);
      triangle(350, 480, 335, 500, 365, 500);
      }


      if (Mdelay < (frameCount - framestore) ) {
        for (int i = 0; i < (int)random(5); i = i+1) { // gives the initial value of 0
        // then randomized between 3 maximum values. This means there can only be between 1 and
        // 3 missiles active
        // then adds +1 to the value of i, but cannot be more than 7.
        // code courtesy of Jacques
          missilelist.add(randomMissile());
        }
        framestore = frameCount;
      }

         if (Mdelay2 < (frameCount - framestore) ) {
        for (int i = 0; i < (int)random(10); i = i+1) { // gives the initial value of 0
        // then randomized between 3 maximum values. This means there can only be between 1 and
        // 3 missiles active
        // then adds +1 to the value of i, but cannot be more than 10.
          missilelist.add(randomMissile());
        }
        framestore = frameCount;
      }



      // render all the missiles.
      for (Missile b : missilelist) {
        b.update();
        b.render();
      }

      {
      ellipseMode(CENTER);
      fill(255, 255, 255);
      strokeWeight(2.0);
      stroke(Blue);
      ellipse(circle1, circle2, 110, 110);

      ellipseMode(CENTER);
      fill(255, 255, 255);
      strokeWeight(1.5);
      stroke(Green);
      ellipse(circle9, circle10, 80, 80);
      }

      {
      ellipseMode(CENTER);
      fill(255, 255, 255);
      strokeWeight(2.0);
      stroke(Blue1);
      ellipse(circle3, circle4, 110, 110);

      ellipseMode(CENTER);
      fill(255, 255, 255);
      strokeWeight(1.5);
      stroke(Green1);
      ellipse(circle11, circle12, 80, 80);
      }

      {
      ellipseMode(CENTER);
      fill(255, 255, 255);
      strokeWeight(1.5);
      stroke(Blue2);
      ellipse(circle5, circle6, 110, 110);

      ellipseMode(CENTER);
      fill(255, 255, 255);
      strokeWeight(1.5);
      stroke(Green2);
      ellipse(circle13, circle14, 80, 80);
      }

      {
      ellipseMode(CENTER);
      fill(255, 255, 255);
      strokeWeight(1.5);
      stroke(Blue3);
      ellipse(circle7, circle8, 110, 110);

      ellipseMode(CENTER);
      fill(255, 255, 255);
      strokeWeight(1.5);
      stroke(Green3);
      ellipse(circle15, circle16, 80, 80);
      }


    }

    void mousePressed() {
    fireX = 350;
    fireY = 480;
    posX = mouseX;
    posY = mouseY;

    smooth();
    strokeWeight(2.5);
    stroke(255,0,0);
    line(fireX, fireY, posX, posY);

    }

PhiLho

Re: How to reference a variable inside a class?

11 months ago

There is no reason it wouldn't work with your code, but then again, I don't know what you have tried and how it failed.

cameocream

Re: How to reference a variable inside a class?

11 months ago

I can't get what you described to work. This is what I put in my code-

    void setup() {
      size(700, 500);
      missilelist = new ArrayList<Missile>(); // creates and initially empty ArrayList of missile objects
      frameRate(30); //setting the refresh rate of the game
      missilelist.score++;
      println(missilelist.score);

    }

Jesse Sco..

Re: How to reference a variable inside a class?

11 months ago

Well... think about this for a minute.

You are in setup() - this runs only once, there is no frame advancement. Everything you write in here will only happen once...

cameocream

Re: How to reference a variable inside a class?

11 months ago

I had everything in a draw function before. But nothing was translating over.

GoToLoop

Re: How to reference a variable inside a class?

11 months ago

Never used ArrayList before! Nevertheless, I did a search and found out that I need to use a built-in method called get() to access its contents, rather than the much easier index [] from normal arrays!

Check it out:

private static final ArrayList
               
                <Missile> missileList = 
                new 
                ArrayList
                
               
               
                
                 <Missile>(); 
                 final void 
                 setup() {     
                 size(700, 500);     
                 frameRate(30);     missileList.
                 add( 
                 new Missile() );     missileList.
                 add( 
                 new Missile() );          missileList.
                 get(0).score++;     missileList.
                 get(0).score++;     missileList.
                 get(1).score++;     
                 println(
                 "score@Missile[0] = " + missileList.
                 get(0).score);     
                 println(
                 "score@Missile[1] = " + missileList.
                 get(1).score); } 
                 private final class Missile {     
                 int score; }

rapatski

Re: How to reference a variable inside a class?

11 months ago

Like GoToLoop says, you were using an arraylist of Missiles, so you have to access the Missile in this list first using your_arraylist.get()

Only thing I have to add is a conventient way of accessing your missiles is to assign them to a temporary object like this:

ArrayList<Missile>
                 
                   missile_list;


                  void 
                  setup()
{
  missile_list = 
                  new 
                  ArrayList
                  
                 
                 
                  
                   <Missile>();   
                   for (
                   int i = 0; i < 100; i++)   {     Missile m = 
                   new Missile();     missile_list.
                   add(m);   } } 
                   void 
                   draw() {   
                   for (
                   int i = 0; i < 100; i++)   {     Missile m = missile_list.
                   get(i);     m.vel.
                   add(m.acc); 
                   // instead of: missile_list.get(i).vel.add(missile_list.get(i).acc)     m.pos.
                   add(m.vel); 
                   // instead of: missile_list.get(i).pos.add(missile_list.get(i).vel)   } } 
                   class Missile {   
                   PVector pos, vel, acc;   
                   float damage;   Missile()   {     pos = 
                   new 
                   PVector();     vel = 
                   new 
                   PVector();     acc = 
                   new 
                   PVector();     
                   float damage = 0;   } }

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