Hello for the ones that follow my posts a bit I'm making a tower defence and i'm doing very well i've almost finished all the algorithm

but I need to apply some texture to my rect and ellipses because right now it's pretty ugly

and I can't find what function I need to use to apply an img to a shape

do I need to use the fonction image and make it to appear at the same time as the ellipse so it will cover it and make like a texture but I find it a bit hard and bad so ^^

Thanks :)

Hello I'm doing a tower defence for a school project So far i've done a few good things and the basics are almost in place

but my problem is the following : I want the tower to  attack only one "solider" ( here an ellipse) but after several fails I just can't figure out how to do it. right now if 40 balls will be in range 40 projectile will be fired... Well you got the idea.

So here is my code fully commented :

1. //x and y of the balls
   int[] x = new int[251];
   int[] y = new int [251];
   // pos of the towers
   int[] x_t = new int[251];
   int[] y_t = new int[251];
   // pos of the projectiles of the tower
   int[] t_x = new int[2501];
   int[] t_y = new int[2501];
   int[] vie = new int[251]; // vie = life = life of the balls
   float d = 0;
   int[] v = new int[2501]; // speed of the projectiles
   
   int[] zone = new int [251];  // define if the ball is or not in the range of a tower
   
   int n = 0; // define the number of soliders
   int i =0; // for the while who make turn the arrays
   //PImage background_img; img of the background, no need
   int rayon = 15; // dim/2 of the balls
   // speed of the balls in x and y
   int[] spX =new int[251];
   int[] spY =new int[251];
   
   int[] q= new int[251];
   
   void setup() {
     rectMode(CENTER); // for a better placement
   //  background_img = loadImage("back.png"); no need
     for (int u = 0; u<=250; u++) { // fill the array
       x[u] = 1500;
       y[u] = 1500;
       spX[u] = 3;
       spY[u] = 3;
       vie[u] = 20;
       x_t[u] = -1500;
       x_t[u] = -1500;
       q[u]=0;
     }
   
     for (int u = 0; u<=2500; u++) { // fill the other array
       v[u] = 0;
       t_x[u] = -1500  ;
       t_y[u] = -1500  ;
     }
   
   // pos of the towers
     x_t[0] = 235;
     y_t[0] = 75; 
     x_t[1] = 379;
     y_t[1] = 417;
     x_t[2] = 490;
     y_t[2] = 75;
     size(800, 600);
   }
   
   void draw() {
   
     //background(background_img);
   
     size(800, 600);
   
     while ( i < 251) {
   
   // func to print the towers, all the tower have by default -1500;1-1500 as coordinate so it print all the towers of the array until it reach a tower with default pos
       if ( (x_t[i] != -1500)&&(y_t[i] != -1500)) {
         rect(x_t[i], y_t[i], 20, 20);
         noFill();
         stroke(255);
         ellipse(x_t[i], y_t[i], 200, 200);
         stroke(0);
         fill(255);
       }
   
       if ( (x[i] != 1500)&&(y[i] != 1500)) {// same thing with towers, balls have 1500;1500 as default
         mouvement(); // mouvement = move, permit to move following a specific path
         ellipse(x[i], y[i], 30, 30);
       }
      
       for (int k=0; k <= 2; k++) { // in order to calculate if the ball is in the range of the 3 towers we use the func 3 time for 3 towers( 50 if 50 towers for example)
         tour_zone(k); // func to calculate if the tower is in range and if yes it fire
   
     }
     
       i++;
     }
   
     i=0;
   } 
   
   void mousePressed() { // func to add a ball
   
     if (mouseButton != CENTER) {
   
       x[n] = rayon+5 ;
       y[n] = 50 ;
       n += 1;
     }
   }
   
   void mouvement() { // func to move the ball following a specific path, nothing very interesting
   
   
     if (  ( (x[i]>=0)&&(x[i] <180 ))&&(y[i]==50) ) {
       x[i] +=spX[i];
     }
   
   
     if (  ( (x[i] >= 180)&&(x[i]<200 ))&&( (y[i] >= 50)&&(y[i]<470 ))  ) {
       y[i] +=spY[i];
     }
   
   
     if (  ( (x[i] >= 180)&&(x[i]<550 ))&&( (y[i] >= 470)&&(y[i]<=470 ))  ) {
       x[i] +=spX[i];
     }
   
   
     if (  ( (x[i] >= 545)&&(x[i]<=551 ))&&( (y[i] > 50)&&(y[i]<=470 ))  ) {
       y[i] -=spY[i];
     }
   
     if (  ( (x[i] >= 545)&&(x[i]<800 ))&&( (y[i]<=50 ))  ) {
       x[i] +=spX[i];
     }
   }
   
   
   void tour_zone(int k) { // detect if ball is in range
   
     float d = sqrt(sq(x[i]-x_t[k])+ sq(y[i]-y_t[k]));  // math so check if the ball is in the area
   
     if (d-(rayon) < 100) { // if yes
       if (q[i]==0){ // to initialize the fireing process only one time, if not the projectile will stay too close to the turred because of
         t_x[i]  = x_t[k]; // this
         t_y[i] = y_t[k]; // and this
         q[i]=1;
       } if(q[i]==1){
         tour_tir(k);
       }
     } if (d-(rayon) <= 100+spY[i] && d-(rayon)>=100-spY[i]){ // if out of range don't fire
     q[i]=0;
     }
   }
   
   
   void tour_tir(int k) {//algorithm to direct the projectile torwards the ball and dissapear when it touche it
   
    v[i] = 10;
     if (t_x[i] < x[i] ) {
      t_x[i]  +=  v[i];
     }
     if (t_x[i]>x[i]) {
      t_x[i]  -= v[i];
     }
     if (t_y[i] < y[i] ) {
      t_y[i] += v[i];
     }
     if (t_y[i]>y[i]) {
       t_y[i] -= v[i];
     }
     if (t_x[i]  <= x[i]+v[i] &&t_x[i]  >= x[i] -v[i] && t_y[i] <= y[i]+v[i] && t_y[i]>= y[i]-v[i]) { // collision with the ball
      q[i]=0;
       vie[i] -= 1;
       println(vie[i]);
       if (vie[i] <= 0 ){
         x[i] = 8000;
         y[i] = 8000;
       }
     }
       ellipse(t_x[i], t_y[i], 10, 10);// the projectile
   }
   
   

If you can help me with it I would be very pleased.

If you want to run it with its original background that i've commented here it is :

Hello ! I've got 2 classes and one is using a variable of the other so I got a "The field component is not visible." I know very well why this is hapenning so i'm looking for a way to make a global variable.
here is the code is you want to read it.

1. 
   import java.util.List; // actually, it is already imported, but not "activated"!
   // Constant field variables of the top class, the sketch itself!  ;-)
   // an ArrayList which only stores instances of class Balle, and initial size = 128:
   final static List<Balle> balles = new ArrayList(0200);
   final static List<Tour> tours = new ArrayList(0200);
   
   void setup() {
     size(600, 400);
   }
   
   void draw() {
     background(0);
   size(600, 400);
     // this is called enhanced or for-each or even for-in loop
     // iterates all of the elements stored within variable balles
     // since balles only contains instances of class Balle
     // iterator b is declared as of type Balle to receive an element from it:
     for (Balle b: balles)    b.script();
     for (Tour t: tours) t.tour_script();
    
     }
   
   void mousePressed() {
     // if it's NOT a middle-cli ck, add a new instance of Balle:
     switch(mouseButton) {
     
       case CENTER :
       if   (balles.size() != 0)   balles.remove(0);
        break;
        case LEFT :
        balles.add( new Balle() );
        break;
        case RIGHT :
        tours.add( new Tour() );
   }
   }
   
   
   // classe balle ====================================================
   public final class Balle {
     // fields of inner class Balle (instantiatable):
    public int x, y;
     byte  spX, spY;
     int pdv;
     // static constant fields of inner class Balle (non-instantiatable):
     final static byte  taille = 20, rayon = taille/2; //
     Balle() { // constructor of inner class Balle
    x = (short) mouseX;
       y = (short) mouseY;
       pdv = 30;
       // ternary operator ?: which demands 3 operands
       // if (random(2) < 1) multiplies by -1, otherwise by 1:
       spX = 3;
       spY =  3;
     }
   
     void bump() {
       // multiplies spX/spY by -1 in case x/y is (off canvas - size/2 of Balle)
       // afterwards, adds current result of spX/spY into x/y:
      
       if ( x < rayon)  {
       spX *= -1;
     }
    
      if (x> width-rayon)  {
       spX *= -1;
     }
     if ( y <rayon)  {
        spY *= -1;
     }
    
      if (y > height-rayon){
       
        spY *= -1;
     }
   
   x += spX;
   y += spY;
        
       }
      
   
   
     void show() {
       ellipse(x, y,taille,taille);
     }
   
     void script() {
       bump();
       show();
     }
   }
   
   
   
   
   final class Tour{
   int a,b; // pos tour
   int aire; //cercle de zone
   int m,n; //pos tir
   int v;//vitesse du tir
   int zone; //variable dite "soldat est dans la zone"
     int dmg; // dommages de la tour
    
    
    Tour() {
      
     dmg = 5;
     a = mouseX;
     b= mouseY;
     v=0;
     m=a;
     n=b;
     zone = 0;
     aire = 100;
     }
    
    void tour_tir(){//v la vitesse de tir
     if (zone == 1){
       v = 10;
     } if (zone == 0){
       v = 0;
   
         m = m + v;
     } if (m > x){
         m = m - v;
     } if (n < y ){
         n = n + v;
     } if (n>y){
         n = n - v;
     } if ( m <= x+v && m >= x -v && n <= y+v && n>= y-v){
         m = a;
         n = b;
         pdv -= dmg;
     }
   }
   
   void soldat_mort(){
    if (pdv < 0){
   if (balles.size() != 0)   balles.remove(0);
    }
   }
    
   void tour_script() {
    soldat_mort();
     smooth();
     tour_zone();
     tour_tir();
     ellipse(a,b,aire,aire);
    
       ellipse(m,n,10,10);
    
   }
    
   }
   
   
   
   
   

Hello I'm starting with oriented object programming and i'm getting a nullpointerexeption when I try to compile the code.

It's supposed to create a ball at the position where I'm clicking and the balls are moving around and bump on the sides.

here is the code :

1. 
   class balle{
    
     float x;
     float y;
     float deplx;
     float deply;
   
   balle(){
     x= mouseX;
     y= mouseY;
     deplx = random(0,3);
     deply = random(0,3);
   
   }
   
   void show() {
    ellipse(x,y,20,20);
    
   }
   
   void rebond() {
     x += deplx;
     y += deply;
    
     if ( y > 395) {
      deply = -deply ;
     }
     if (y < 5) {
      deply = -deply ;
     }
     if ( x > 395) {
      deplx = -deplx ;
     }
     if (x < 5) {
      deplx = -deplx ;
     }
     
   }
   
   }
   ArrayList balles;
   balle ball;
   
   
   void setup() {
   
     size(400,400);
   ball = new balle();
   }
   
   void mouseClicked() {
   balles.add(new balle());
   }
    
   
   
   void nettoyer() {
    size(400,400);
   background(0) ;
   }
   
   void draw() {
    nettoyer();
     for (int i = 0; i < balles.size()-1; i++ ) {  // here is when it's highlighted
       balle balle = (balle) balles.get(i);
    ball.rebond();
    ball.show();
     }
   
   
   }