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/*
One dimensional cellular automata, where each iteration
adds a new row.
Each cell has three neighbourns, top left, top and top right,
as illustrated below:
123
O
Patterns that lead to a white cell are given as parameter,
forming the rule of the automata.
Example: parameter "001-010-011-100"
Starting from a singe cell, this would lead to:
O
OOO
OO O
OO OOOO
OO O O
OO OOOO OOO
OO O O O
etc.
*/
#include <iostream>
#include <string>
#include <vector>
#include "plugin.h"
#include "pixels.h"
using namespace std;
vector<string> sv;
void iterate(const char *arg);
void draw(const _frame &f);
void perform_effect(_frame f, _args a)
{
arguments ar(a.s);
if(!ar.count()) {
printf("Usage: rowca <rule of automata, or command>\n");
printf("Example rule: 001-010-011-100\n");
printf("Commands: draw, clear\n");
return;
}
char *t = ar[0];
if(strstr(t, "0") || strstr(t, "1")) iterate(t); else
if(strcmp(t, "draw")==0) draw(f); else
if(strcmp(t, "clear")==0) sv.clear();
}
void iterate(const char *arg)
{
if(sv.empty())
{
sv.push_back("00100"); // start with a single cell
}
string s("00"), last=sv.back(), rule(arg);
int i;
for(i=0; i<=last.size()-3; i++)
{
if( rule.find(last.substr(i, 3)) != rule.npos )
s.append("1");
else
s.append("0");
}
s.append("00");
sv.push_back(s);
}
void draw(const _frame &f)
{
if(sv.empty()) return;
int x1=0, y1=0, x2=sv.back().size(), y2=sv.size();
int i;
pixels p(f);
int prevy=-1;
float sourcex, sourcey;
string s;
while(!p.eof())
{
if(p.y != prevy)
{
sourcey = p.y / (float)p.height();
s = sv[sourcey * y2];
// make s the size of x2
i = (x2-s.size()) / 2;
s.insert(1, i, '0');
s.append(i, '0');
prevy = p.y;
}
sourcex = p.x / (float)p.width();
if( !s.compare(sourcex * x2, 1, "1") )
p.putrgb(255, 255, 255);
else
p.putrgb(0, 0, 0);
p.next();
}
cout << "rows: " << y2 << " size of last row: " << x2 << endl;
}
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