Processing 1.0 and almost the law of the world

class GravGrid
{
int w = 0; /* .*/
int h = 0; /* .*/
int step = 0; /* .
. */
float G =0; /* .


*/
/* */
public ArrayList points = new ArrayList();
ArrayList vectors; /*
*/
/* . w, h, step G */
GravGrid( int w, int h, int step, float G)
{
this .w = w;
this .h = h;
this .step = step;
this .G = G;
}
public void CreateGrid() /* */
{
vectors = new ArrayList(); /* CreateGrid()

*/
GravVector v; /* */
GravPoint p; /* */
float xSum; /* X */
float ySum; /* Y */
float a = 0; /*
*/
for ( int x = 0; x < w; x += step) /*
*/
for ( int y = 0; y < h; y += step)
{
xSum = 0;
ySum = 0;
v = new GravVector(x, y); /*
GravVector*/
/* */
for ( int i = 0; i < points.size(); i++)
{
/* i - */
p = (GravPoint)points.get(i);
a = atan2((px - x), (py - y)); /* */
/* X .
dist(x1, y1, x2, y2) -
*/
xSum += p.Grav(dist(x, y, px, py), G) * sin(a);
/* Y .*/
ySum += p.Grav(dist(x, y, px, py), G) * cos(a);
}
v.Set(xSum, ySum); /*
*/
vectors.add(v); /* */
}
}

public void DrawGrid() /* */
{
float arrowsize = 4; /* */
float len = 0; /* */
GravVector v;
/* */
for ( int i = 0; i < vectors.size(); i++)
{
/* i - */
v = (GravVector)vectors.get(i);
/* ,
File -> Examples ->
Topics -> Simulate -> SimpleParticleSystem
pushMatrix() -
.
, .*/
pushMatrix();
translate(v.x0, v.y0); /*

v.x0, v.y0 -
*/
stroke(255, 0, 0); /* */
/*
v.Get() - PVector */
rotate(atan2(v.Get().y, v.Get().x));
len = v.Get().mag(); /* */
/* */
line(0,0,len,0);
line(len,0,len-arrowsize,+arrowsize/2);
line(len,0,len-arrowsize,-arrowsize/2);
popMatrix();
}
}

/* */
public PVector GetVector( float x, float y)
{
GravVector v;
for ( int i = 0; i < vectors.size(); i++)
{
v = (GravVector)vectors.get(i);
if ((v.x0 <= x)
&& (x < (v.x0 + step))
&& (v.y0 <= y)
&& (y < (v.y0 + step)))
return v.Get();
}
return new PVector(0, 0);
}
}

class GravPoint /* */
{
public int x = 0; /* X */
public int y = 0; /* Y */
float mass = 0; /* .

*/
GravPoint( int x, int y, float mass) /* */
{
this .x = x;
this .y = y;
this .mass = mass;
}
/* .
d() */
public float Grav( float d, float G) { return mass * G / d; }
}

class GravVector /* */
{
public int x0 = 0; /* X */
public int y0 = 0; /* Y */
public float x = 0; /* X +
X */
public float y = 0; /* Y */
GravVector( int x0, int y0) /* */
{
this .x0 = x0;
this .y0 = y0;
}
/* */
public void Set( float x, float y)
{
this .x = x0 + x;
this .y = y0 + y;
}
/* PVector GravVector*/
public PVector Get() { return new PVector(x - x0, y - y0); }
}

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int w;
int h;
GravGrid gg;
Particle[] s;
void setup()
{
size(800, 600, JAVA2D); /* P2D,
JAVA2D,
- */
background(255);
w = width;
h = height;
s = new Particle[50]; /* */
gg = new GravGrid(w, h, 20, 40); /* */
for ( int i = 0; i < s.length; i++)
s[i] = new Particle();
gg.points = new ArrayList();
/* */
for ( int i = 0; i < 7; i++)
gg.points.add( new GravPoint(
( int )random(0, w), /* X */
( int )random(0, h), /* Y */
/*

! :) */
( int )random(-120, 120)));
gg.CreateGrid(); /* */
}

GravPoint p;
void draw()
{
/* 20
:)
alpha, */
fill(255, 20);
noStroke();
rect(0, 0, w, h);
for ( int i = 0; i < s.length; i++)
{
s[i].DrawParticle(gg); /* i - */
/* , */
if (s[i].x > w
|| s[i].x < 0
|| s[i].y > h
|| s[i].y < 0)
{
s[i] = new Particle();
}
else
{
for ( int t = 0; t < gg.points.size(); t++)
{
/* */
p = (GravPoint)gg.points.get(t);
fill(255);
stroke(0);
/* */
ellipse(px, py, abs(p.mass), abs(p.mass));
/* , */
if ((((px - (p.mass / 4)) <= s[i].x)
&& (s[i].x < (px + (p.mass / 4)))
&& ((py - (p.mass / 4)) <= s[i].y)
&& (s[i].y < (py + (p.mass / 4)))))
{
s[i] = new Particle();
}
}
}
}
if (keyPressed) if (key == '1' ) setup();
if (keyPressed) if (key == '2' ) gg.DrawGrid();
}

class Particle
{
float t = 0;
float m = random(3, 6);
float y = random(m, h);
float x = random(m, w);
float v0x = 0;
float v0y = 0;
public void DrawParticle(GravGrid gg)
{
t += 0.005;
x += v0x * t + (gg.GetVector(x, y).x / m) * pow(t, 2) / 2;
y += v0y * t + (gg.GetVector(x, y).y / m) * pow(t, 2) / 2;
fill(0, 0, 0, t * 300);
noStroke();
ellipse(x, y, m, m);
}

}

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