Hello  im having a problem, ive made a program that creates a matrix of dots, it has 2  functions that are controled with keys: animation and gravity.  when i press the animation  key the dots become animated, the thing is that i need that when i press another key the dots return to its original position. For making this task im using gravity,  each dot has as center of gravity the original position. when i begin the program the gravity is turned off, then i turn on the animation key and the dots begin to move, when i want that my dots return to its original place i press the gravity key. The program is working but is not perfect:  when the gravity is turned on and each dot is at the same position of the its original position the gravity stops. The problem is the animation algorithm  uses a lot of floating point values, so i need to make an int() to the x and y values to compare with the original position of the same dot , in the process of converting the floating point to int there is a little change so the gravity doesnt stop when the dot is in the same position of its initial position but there is a diference of one pixel,  Do anybody have an idea of how can i fix this?


many thanks


pun

here is an example : try "q" key to begin animation and then "w" key to gravity.

Code:

lineas[][] rayas = new lineas[30][30];
float boton_uno = 0;
float boton_dos = 0;
float distancia_entero;


void setup(  ) {
  
  size(600, 600);
  
  for (int i=0 ; i < 30 ; i ++) {
    for (int j=0 ; j < 30 ; j ++) {
    rayas[i][j] = new lineas( 42 * i , 22 * j, j);
    
  }
 } 
}


void draw( )   {
  background(255,255,255);
  ellipse( 240, 240 , 12, 12);
    for (int i=0 ; i < 30 ; i ++) {
    for (int j=0 ; j < 30 ; j ++) {

	  rayas[i][j].dibuja();
   
    if ( i == 1 && j == 1 ){
	distancia_entero = int(rayas[i][j].ex) + int(rayas[i][j].x);

    } 
  
}  
  }
  
  if (boton_uno == 1){
    
   mueve ();
  }
  
   if (boton_dos == 1){
    
   gravedad ();
  }
 
    if (boton_dos == 0){
    
   resetea_gravedad ();
  }
 
  }
  




void mueve() {
  
	 for (int i=0 ; i < 30 ; i ++) {
    for (int j=0 ; j < 30 ; j ++) {

if (boton_dos == 1) {
if (int(rayas[i][j].ex) + int(rayas[i][j].x) == (rayas[i][j].valor_inicial_x ) && int(rayas[i][j].yz + rayas[i][j].y )== int(rayas[i][j].valor_inicial_y)){

  rayas[i][j].switcher = 1;

}
else {
   rayas[i][j].switcher = 0;
  
  
}}

	rayas[i][j].mover();  

}  
  }
}


void gravedad() {
  
	 for (int i=0 ; i < 30 ; i ++) {
    for (int j=0 ; j < 30 ; j ++) {

	rayas[i][j].calcular_distancia_gravedad();  

}  
  }
}

void resetea_gravedad() {
  
	 for (int i=0 ; i < 30 ; i ++) {
    for (int j=0 ; j < 30 ; j ++) {

	rayas[i][j].delta_x = 0; 
	rayas[i][j].delta_y = 0;   

  
}  
  }
}


void keyPressed() {
  
   if (key == 'q' || key == 'Q') {
     boton_uno =  1;

}
   if (key == 'a' || key == 'A') {
     boton_uno =  0;

}

   if (key == 'w' || key == 'W') {
     boton_dos =  1;

}
   if (key == 's' || key == 'S') {
     boton_dos =  0;

}

  }

  
  


class lineas {
  float x;
  float y;
  float jot;
  float ex = 0;
  float yz = 0;
  
  float dx;
float dy;
  
  float direccion = random(TWO_PI);
float velocidad = 0.6;
float d ;  
float k = 1.3;
float delta_x;
float delta_y;
  
float valor_inicial_x;
float valor_inicial_y;
  
float absoluto_x;
float absoluto_y;
float switcher = 0;
  
  
 lineas (float equis, float ygriega , float jota ) {
  
 valor_inicial_x = equis;
 valor_inicial_y = ygriega; 
 x    = equis;
 y = ygriega;
 jot = jota  ; 

 }
 
 void calcular_distancia_gravedad() {
 //  d = dist( 240, 240, x - ex, y - yz );
    d = dist( valor_inicial_x, valor_inicial_y, x - ex, y - yz );
   delta_x = k * ( valor_inicial_x -  x - ex)/ d * d ;
   delta_y = k * ( valor_inicial_y - y - yz )/ d * d ;
    delta_x = delta_x;
     delta_y = delta_y;
	
 }
 
 
  void mover(){
    cambiaangulo(20);
   dx =  velocidad  * cos(direccion);
 //  print(" " + dx);
   dy = velocidad  * sin(direccion );

   if (switcher == 0 ){
  ex = ex + dx + delta_x;
  yz = yz + dy + delta_y; 
   }
   else
   {
 ex = ex;
 yz = yz ;
     
   }
  }
 
 void cambiavariable(float moco){
    ex = ex + moco;
 yz = yz + moco;
   
 }

void dibuja() {
  //translate(ex, yz);  
  pushMatrix ();

  
 translate(x, y );
 pushMatrix();
  translate(ex, yz); 

  line(3, 3 , 58, 3);
popMatrix();
popMatrix();
}
 
 void cambia(){
  ex = ex +  1;
 yz = yz + 22; 
   
 }
 
 void cambiaangulo(float amplitud) {
  
 float radianes = radians(amplitud);
 direccion = direccion + random ( - radianes , radianes);
  
}
 }