JS1k 2012 - 1199 - Details - A lovely JavaScript golfing competition

Author:

Mark Biesheuvel

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Reddit:

/r/

Pouet:

Website:

blog.markbiesheuvel.name/entry/3/Cellular_automaton

Compo:

classic

Demo link:

https://js1k.com/2012-love/demo/1199

Shortlink:

https://js1k.com/1199

Blog post:

please update here!

Bytes:

562

Chars:

562

Submission

function B(a,b){x=8*(a%60)/e-2;y=2-8*(b%60)/e;return P(P(x,2)+P(y,2)-1,3)<P(x,2)*P(y,3)}function F(a,b){u=Array(e);for(i=0;i<e;i++){u[i]=Array(e);for(j=0;j<e;j++){a(u,b)}}return u}with(m=Math)P=pow;c.width=c.height=f=600;e=f/5;t=0;R=[[[[0,1],[1,0]],[[-1,0],[0,-1]]],[[[-1,0],[0,1]],[[0,-1],[1,0]]]];C=F(function(a){a[i][j]="#"+((B(i,j)?200:140)+m.floor(55*m.random())).toString(16)+"0000"});setInterval(function(){F(function(){a.fillStyle=C[i][j];a.fillRect(5*i,5*j,5,5)});t=++t%2;C=F(function(a,b){r=b[i%2][j%2];a[i][j]=C[(i+r[0]+e)%e][(j+r[1]+e)%e]},R[t])},66)

Description

A (multiple) heart(s) shaped cellelar automaton in which each cell keeps moving in the same direction. Full description on website. (http://blog.markbiesheuvel.name/entry/3/Cellular_automaton)

Base64 encoded

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

Original source

//Some initializations
with(m=Math) P=pow;
c.width = c.height = f = 600;
e=f/5;
t=0;

//Very complicated 4 dimensional array
//It's kinda the thing that make this all work
R = [[[[0,1],[1,0]],[[-1,0],[0,-1]]],[[[-1,0],[0,1]],[[0,-1],[1,0]]]];

//Setting initial colors using the double for loop function
C = F( function(u){
		u[i][j] = '#' + ((B(i,j)?200:140) + m.floor(55*m.random())).toString(16) + '0000';
	});
	
//Draw function using the double for loop function and ignoring return value
setInterval(
function(){
/*  C = */F( function(){
			//Canvas stuff
			a.fillStyle = C[i][j];
			a.fillRect(5*i, 5*j, 5, 5);
		});
	t = ++t%2;
	
	//Next iteration using the double for loop function
	C = F( function(u,z){
		//Selecting correct rule
		r = z[i%2][j%2];
		//Retrieve color from previous state by applying rule
		u[i][j] = C[(i+r[0]+e)%e][(j+r[1]+e)%e];
	}, R[t]);
}, 66);

//The famous double for loop function I talked about earlier on
//This lambda will generate a gird by applying the given function on each cell
// v is a function
// w a part from the 4d-array (which is omitted in case of init and draw)
function F(v,w){
	//Create square array of size e with double for loop
	u = Array(e);
	for(i=0;i<e;i++){
		u[i] = Array(e);
		for(j=0;j<e;j++){
			//Execute function from parameter inside double for loop
			v(u,w);
		}
	}
	return u;
}

//Inside or outside the heart; that's the question
function B(i,j){
	//Mapping of array coordinates to canvas coordinates
	x = 8*(i%60)/e-2;
	y = 2-8*(j%60)/e;
	//Using the famous equation of (x^2+y^2-1)^3 < x^2*y^3
 	return P(P(x,2)+P(y,2)-1,3) < (P(x,2)*P(y,3));
}

JS1k: The JavaScript code golfing competition

2012 - Love

Cellular Automaton