iznax · March 4, 2012 00:29 · JavaScript-Packer · Jul 31, 2015
diff --git a/Readme.md b/Readme.md
diff --git a/annotated.js b/annotated.js
 // Assign to a variable to measure function body.
 var Update=
 function(k,h)
 {
    // Check for bullets hitting enemies
    k=1<<b-x;           // positional bit pattern of bullet
    t-=h=e==y  ?t&k:0;  // remove any enemy hits from top line
    w-=k=e==y+1?w&k:0;  // remove any enemy hits from bottom line

    // Move bullet up (or hide off-screen)
    e -= h|k ? H:1;
  
    // Reset enemy wave when all destroyed?
    t|w ? 0 :(x=4,y=0,t=w=Z);
  
    // Check if enemy lines are blocked on left/right sides?
    (t|w) & 1<<(d>0)*R-x ?
      (y++,d=-d) : // move down and change directions
      x+=d         // move left/right
 }
diff --git a/index.js b/index.js
 function(k,h){k=1<<b-x;t-=h=e==y?t&k:0;w-=k=e==y+1?w&k:0;e-=h|k?H:1;t|w?0:(x=4,y=0,t=w=Z);(t|w)&1<<(d>0)*R-x?(y++,d=-d):x+=d}
diff --git a/License.txt b/License.txt
 The "WTH" Public License

 Copyright (C) 2012 Paul Isaac

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

 #. You can do whatever-the-heck you like with this code.
diff --git a/package.json b/package.json
 {
  "name": "MiniInvaders",

  "description": "Mini version of Space Invaders in less than 140 bytes",

  "keywords": [
    "game",
    "javascript",
    "space",
    "invaders"
  ]
 }
diff --git a/test.html b/test.html
 <html>
 <style>body{ font-family: monospace; font-size: 20px}</style>
 <div id="out"></div>
 </html>

 <script>

 var W=16,R=W-1;  // Screen Width
 var H=10,B=H-1;  // Screen Height
 var p=W/2;       // Player position X
 var x=4,y=0;     // Enemy top/left position
 var d=1;         // Enemy direction -1,+1
 var t=w=Z=85     // Enemy top/bot bit pattern
 var b=0,e=-1;    // Bullet position X,Y

 var Update=function(k,h)
 {
    // Check for bullets hitting enemies
    k=1<<b-x;
    t-=h=e==y  ?t&k:0;
    w-=k=e==y+1?w&k:0;

    // Move bullet up or hide
    e-=h|k?H:1;
  
    // Reset when all enemies destroyed?
    t|w?0:(x=4,y=0,t=w=Z);
  
    // Check if enemy lines are blocked on left/right sides?
    (t|w) & 1<<(d>0)*R-x ?
      (y++,d=-d) : // move down and change directions
      x+=d         // move left/right
 }

 function Draw()
 {
    var view = "";
    for (var j=0; j<H; j++)
    {
        for(var i=0;i<W;i++)
        {
            var c = (i==p & j==B)?3:0;       // Player?
            if (j==y) c=t&(1<<(i-x))?1:c;    // Enemy?
            if (j==y+1) c=w&(1<<(i-x))?1:c;  // Enemy?
            c = (i==b & j==e)?(c==1)?4:2:c;  // Bullet?
            // Has bottom of wave touched ground?
            c = y-!w+1<B?c:5;                // Game Over?
            view += ".#i^@*"[c];
        }
        view += "<br>";
    }
    document.getElementById('out').innerHTML = view+"----------------";
 }

 // IE requires implicit 'event' parameter?
 document.onkeydown = function()
 {
    var k=event.keyCode;
    p -= k==37 & p>0;            // Move left?
    p += k==39 & p<R;            // Move right?
    if (k==38 & e<0) b=p, e=H-2; // Fire bullet?
    Draw();
 }

 function Main()
 {
  Update(0,0);
  Draw();
  setTimeout(Main, 300);
 }

 Main();

 </script>
	// Assign to a variable to measure function body.
	var Update=
	function(k,h)
	{
	// Check for bullets hitting enemies
	k=1<<b-x; // positional bit pattern of bullet
	t-=h=e==y ?t&k:0; // remove any enemy hits from top line
	w-=k=e==y+1?w&k:0; // remove any enemy hits from bottom line

	// Move bullet up (or hide off-screen)
	e -= h\|k ? H:1;

	// Reset enemy wave when all destroyed?
	t\|w ? 0 :(x=4,y=0,t=w=Z);

	// Check if enemy lines are blocked on left/right sides?
	(t\|w) & 1<<(d>0)*R-x ?
	(y++,d=-d) : // move down and change directions
	x+=d // move left/right
	}
	The "WTH" Public License

	Copyright (C) 2012 Paul Isaac

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	#. You can do whatever-the-heck you like with this code.
	{
	"name": "MiniInvaders",

	"description": "Mini version of Space Invaders in less than 140 bytes",

	"keywords": [
	"game",
	"javascript",
	"space",
	"invaders"
	]
	}
	<html>
	<style>body{ font-family: monospace; font-size: 20px}</style>
	<div id="out"></div>
	</html>

	<script>

	var W=16,R=W-1; // Screen Width
	var H=10,B=H-1; // Screen Height
	var p=W/2; // Player position X
	var x=4,y=0; // Enemy top/left position
	var d=1; // Enemy direction -1,+1
	var t=w=Z=85 // Enemy top/bot bit pattern
	var b=0,e=-1; // Bullet position X,Y

	var Update=function(k,h)
	{
	// Check for bullets hitting enemies
	k=1<<b-x;
	t-=h=e==y ?t&k:0;
	w-=k=e==y+1?w&k:0;

	// Move bullet up or hide
	e-=h\|k?H:1;

	// Reset when all enemies destroyed?
	t\|w?0:(x=4,y=0,t=w=Z);

	// Check if enemy lines are blocked on left/right sides?
	(t\|w) & 1<<(d>0)*R-x ?
	(y++,d=-d) : // move down and change directions
	x+=d // move left/right
	}

	function Draw()
	{
	var view = "";
	for (var j=0; j<H; j++)
	{
	for(var i=0;i<W;i++)
	{
	var c = (i==p & j==B)?3:0; // Player?
	if (j==y) c=t&(1<<(i-x))?1:c; // Enemy?
	if (j==y+1) c=w&(1<<(i-x))?1:c; // Enemy?
	c = (i==b & j==e)?(c==1)?4:2:c; // Bullet?
	// Has bottom of wave touched ground?
	c = y-!w+1<B?c:5; // Game Over?
	view += ".#i^@*"[c];
	}
	view += "<br>";
	}
	document.getElementById('out').innerHTML = view+"----------------";
	}

	// IE requires implicit 'event' parameter?
	document.onkeydown = function()
	{
	var k=event.keyCode;
	p -= k==37 & p>0; // Move left?
	p += k==39 & p<R; // Move right?
	if (k==38 & e<0) b=p, e=H-2; // Fire bullet?
	Draw();
	}

	function Main()
	{
	Update(0,0);
	Draw();
	setTimeout(Main, 300);
	}

	Main();

	</script>