How to put my player in a class

TitusMachine_

Hey guys, I'm an amateur programmer and I totally don't get classes when it comes to arrays, or arrays in array classes in sub classes,.. It totally blows my mind.

I made a code and I have so much difficulties with placing it in a class. would someone of you guys help me learn the workflow by the hand of my code/? I even get stuck with raising or reducing my angle of the first array.

It's just a small code with some trigonometry for a plane character (based on MineStorm II 1983):

int fadeAmount=3;
int fadeCountAllow;
boolean move=false;
float oldX, oldY;
float angle;
float[] middlePlayerX=new float[fadeAmount]; float[] middlePlayerY=new float[fadeAmount];
float gunRadius=50;
float[] gunPointX=new float[fadeAmount]; float[] gunPointY=new float [fadeAmount];
float sideRadius=19.3;
float[] side1X=new float[fadeAmount]; float[] side1Y=new float[fadeAmount]; float[]side2X=new float[fadeAmount]; float[]side2Y=new float[fadeAmount];
float middleRadius=10.7;
float[] middle1X=new float[fadeAmount]; float[]middle1Y=new float[fadeAmount]; float[] middle2X=new float[fadeAmount]; float[] middle2Y=new float[fadeAmount];
float endRadius=35.7;
float[] end1X=new float[fadeAmount]; float[] end1Y=new float[fadeAmount]; float[] end2X=new float[fadeAmount]; float[] end2Y=new float[fadeAmount];

float speed=8;

void setup()
{
  size(900,900);
  strokeWeight(4);
  stroke(255);
  middlePlayerX[0]=width/2; middlePlayerY[0]=height/2;
}

void draw()
{
  background(50);

  gunPointX[0]=gunRadius*cos(angle);
  gunPointY[0]=gunRadius*sin(angle);
  middle1X[0]=middleRadius*cos(angle-HALF_PI);
  middle1Y[0]=middleRadius*sin(angle-HALF_PI);
  middle2X[0]=middleRadius*cos(angle+HALF_PI);
  middle2Y[0]=middleRadius*sin(angle+HALF_PI);
  end1X[0]=endRadius*cos(angle-HALF_PI-THIRD_PI);
  end1Y[0]=endRadius*sin(angle-HALF_PI-THIRD_PI);
  end2X[0]=endRadius*cos(angle+HALF_PI+THIRD_PI);
  end2Y[0]=endRadius*sin(angle+HALF_PI+THIRD_PI);
  side1X[0]=sideRadius*cos(angle-THIRD_PI-THIRD_PI);
  side1Y[0]=sideRadius*sin(angle-THIRD_PI-THIRD_PI);
  side2X[0]=sideRadius*cos(angle+THIRD_PI+THIRD_PI);
  side2Y[0]=sideRadius*sin(angle+THIRD_PI+THIRD_PI);

  if(move)
  {
  middlePlayerX[0]=middlePlayerX[0]+cos(angle)*speed;
  middlePlayerY[0]=middlePlayerY[0]+sin(angle)*speed;
  }

  for(int i=0; i<fadeAmount; i++)
  {
  stroke(255,255-i/float(fadeAmount)*255);

  if(i==0)
  {
  line(middlePlayerX[i]+middle1X[i],middlePlayerY[i]+middle1Y[i],middlePlayerX[i]+gunPointX[i],middlePlayerY[i]+gunPointY[i]);
  line(middlePlayerX[i]+middle2X[i],middlePlayerY[i]+middle2Y[i],middlePlayerX[i]+gunPointX[i],middlePlayerY[i]+gunPointY[i]);
  }

  line(middlePlayerX[i]+end1X[i],middlePlayerY[i]+end1Y[i],middlePlayerX[i]+middle2X[i],middlePlayerY[i]+middle2Y[i]);
  line(middlePlayerX[i]+end2X[i],middlePlayerY[i]+end2Y[i],middlePlayerX[i]+middle1X[i],middlePlayerY[i]+middle1Y[i]);

  line(middlePlayerX[i]+side1X[i],middlePlayerY[i]+side1Y[i],middlePlayerX[i]+end1X[i],middlePlayerY[i]+end1Y[i]);
  line(middlePlayerX[i]+side2X[i],middlePlayerY[i]+side2Y[i],middlePlayerX[i]+end2X[i],middlePlayerY[i]+end2Y[i]);
  }

  fadeCountAllow++;

  if(fadeCountAllow==4){
  for(int i=fadeAmount-1; i>0; i--)
  {
  middlePlayerX[i]=middlePlayerX[i-1];
  middlePlayerY[i]=middlePlayerY[i-1];
  gunPointX[i]=gunPointX[i-1];
  gunPointY[i]=gunPointY[i-1];
  middle1X[i]=middle1X[i-1];
  middle1Y[i]=middle1Y[i-1];
  middle2X[i]=middle2X[i-1];
  middle2Y[i]=middle2Y[i-1];
  end1X[i]=end1X[i-1];
  end1Y[i]=end1Y[i-1];
  end2X[i]=end2X[i-1];
  end2Y[i]=end2Y[i-1];
  side1X[i]=side1X[i-1];
  side1Y[i]=side1Y[i-1];
  side2X[i]=side2X[i-1];
  side2Y[i]=side2Y[i-1];
  }
  fadeCountAllow=0;
  }

}

void keyPressed()
{
  if(keyPressed)
  {
  if(keyCode==UP) { angle+=0.5; }
  if(keyCode==DOWN) { angle-=0.5; }

  if(key==' ' )
  {
  move=true;
  }
  }
}

void keyReleased()
{
  if(key==' ') { move=false; }
}

Lord_of_the_Galaxy

Take it slowly- learn about classes in Java, then read up the tutorials in the Processing website.

TitusMachine_

I would like to, but school is pushing me too hard, I'm yet one of the latest sheeps in programming. See, I have exams coming so all my time is being compressed by projects.

Chrisir

There is a tutorial on objects in the website

Remember to hit ctrl-t in procession to get auto-indent

To use objects, make the smallest entity: when you have a grid of cells make a class Cell (not class Grid)

When you have multiple players make a class Player

I am not sure what your code does of why middlePlayerX is an array. Do you have multiple players?

TitusMachine_

no it is to leave a trail behind my plane thanks anyway it seems to help a little bit

Chrisir

do this

https://www.processing.org/tutorials/objects/

Chrisir

SO

all those are arrays of length fadeAmount:

float[] middlePlayerX=new float[fadeAmount]; 
float[] middlePlayerY=new float[fadeAmount];



float[] gunPointX=new float[fadeAmount]; 
float[] gunPointY=new float [fadeAmount];


float[] side1X=new float[fadeAmount]; 
float[] side1Y=new float[fadeAmount]; 
float[]side2X=new float[fadeAmount]; 
float[]side2Y=new float[fadeAmount];


float[] middle1X=new float[fadeAmount]; 
float[]middle1Y=new float[fadeAmount]; 
float[] middle2X=new float[fadeAmount]; 
float[] middle2Y=new float[fadeAmount];


float[] end1X=new float[fadeAmount]; 
float[] end1Y=new float[fadeAmount]; 
float[] end2X=new float[fadeAmount]; 
float[] end2Y=new float[fadeAmount];

So instead of using parallel arrays (where the same line of every array describes one player (fading)): use a class Player and an array of that class:

Player[] playerFadings = new Player [fadeAmount]; 

Now the class Player looks like this:

class Player {


    float middlePlayerX;
    float middlePlayerY;



    float gunPointX;
    float gunPointY;


    float side1X;
    float side1Y;
    float side2X;
    float side2Y;


    float middle1X;
    float middle1Y;
    float middle2X;
    float middle2Y;


    float end1X;
    float end1Y;
    float end2X;
    float end2Y;

     void display() {

     }

}

see

https://forum.processing.org/two/discussion/8081/from-several-arrays-to-classes

TitusMachine_

Got it! Thanks it does the job.

TitusMachine_

In my code I have an arrayList of a class, I can .add objects to it but I don't succeed at appending an array of a class. I did something like:

  Enemy enemy=new Enemy(0,0,true,true);
  enemyArr=append(enemy);

It shows me that it's wrong but I don't find a lot on the internet for how it works to append an array of a class, can you tell me what suppose to change on this line?

GoToLoop

https://Processing.org/reference/append_.html

https://forum.Processing.org/two/discussion/8080/why-use-arraylist-instead-of-array-with-append

Chrisir

SomeClass[] items = (SomeClass[]) append(originalArray, element)

TitusMachine_

Thanks for answering guys it helps me alot for my exams! I have yet seen the reference page but I don't get what i suppose to fill in items? something random? But than it says that its not being used?

Enemy enemy=new Enemy(0,0,true,true);

Enemy[] ??? = (Enemy[])append(enemyArr,enemy);

GoToLoop

Given the function append() creates a clone of the passed original array, we need to assign it to some variable. Generally the very same variable pointing to the original array:

Enemy[] foes = new Enemy[0]; // empty
Enemy foe = new Enemy(0, 0, true, true); // create a new Enemy
foes = (Enemy[]) append(foes, foe); // array's length = 1 now

Again, arrays aren't meant to have its length changed all the time. It's an awkward procedure! :-&
For that lists, like the famous ArrayList, are more apt for the task: *-:)

1. https://Processing.org/reference/ArrayList.html
2. https://forum.Processing.org/two/discussion/8080/why-use-arraylist-instead-of-array-with-append

TitusMachine_

its okay I'm sorry guys, thanks for the help! enemyArr= (Enemy[])append(enemyArr,enemy);