JS1k 2010 - 792 - Details - A ground breaking JavaScript golfing competition

Author:

Gabor Nagy

Twitter:

GitHub:

Facebook:

Google+:

Reddit:

/r/

Pouet:

Website:

Compo:

classic

Demo link:

https://js1k.com/2010-first/demo/792

Shortlink:

https://js1k.com/792

Blog post:

please update here!

Bytes:

1021

Chars:

1021

Submission

u=document;c=u.getElementById("c");M=Math;W=H=c.width=c.height=420;A=35;B=25;I=[];F=[];v=1;t=U=Z=l=k=o=0;
window.setInterval(function(){with(s=c.getContext("2d")){s.E=fillRect;s.T=fillText;fillStyle="#000";E(0,0,W,H);fillStyle="#fff";T("L:"+l,0,8);if(k)T("GAME OVER",W/2-A,H/2);else if(I.length){J=0;K=W;E(t,H-8,A,8);E(t+15,H-12,5,5);for(j=F.length;j--;)with(F[j])y>0?E(x,y-=5,3,7):F.splice(j,1);fillStyle="#15f";Z<H&&U>0?E(U-=10*M.cos(U),Z+=3,5,5):U=Z=0;for(i=I.length;i--;)with(I[i]){w=y+o;for(z=0;z++<A;)"00111111111010110100011001010011111".charAt(z)|0&&E(x+5*(z%7),w+5*(z%5),5,5);x+=v*(M.log(l+1)+1/I.length);
if(w+B>H-13||Z==H&&U>t&&U<t+A)k=1;for(j=F.length;j--;)if(F[j].x>x&&F[j].x<x+A&&F[j].y>w&&F[j].y<w+B){F.splice(j,1);I.splice(i,1);if(U==0)U=t+9}if(x>J)J=x;if(x<K)K=x}if(J>W-A||K<0){v=-v;o+=4}}else{for(j=56;j--;)I.push({x:60*(j%7),y:A*(j%8)+9});o=0;l++}}},1);u.onkeydown=function(a){switch(a.keyCode){case 37:t-=A;break;case 39:t+=A;break;case 32:F.length<4&&F.push({x:t+17,y:H});break;case 38:l++;break}};

Description

Space Invaders Game v0.3 The aliens are trying to invade the Earth. Don't let them reach You. Shoot them all and go to the next level where the invasion is faster. LEFT/RIGHT ARROW: Move left/right SPACE: Fire UP ARROW: Next level (more SPEED) Features - Groovy drop bomb - Invaders speed up - Multiple shots - 'Game Over' screen

Base64 encoded

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Original source

// 1k Space Invaders 
// A JS1k entry by Gabor Nagy
// email: nagy.gabor.i@gmail.com

// Some random init stuff
u = document;
c = u.getElementById('c');
M = Math;
W = H = c.width = c.height = 420;
A = 35;
B = 25;
I = [];	
F = [];		
v = 1;		
t = U = Z = l = k = o = 0;

window.setInterval(function() { 
	with(s = c.getContext('2d')) {
		s.E = fillRect;
		s.T = fillText;
		// clearscreen	
		fillStyle = '#000';
		E(0,0,W,H);	
		fillStyle = '#fff';
		// draw level indicator
		T('L:'+l,0,8);
		// if we are not dead
		if (!k){
			// and have some invaders
			if (I.length) {
				// reset max and min x;
				J = 0;
				K = W;
				// draw turet
				E(t,H-8,A,8);
				E(t+15,H-12,5,5);
				// draw fire
				j = F.length;
				while (j--)
					with (F[j])
						(y>0) ? E(x,y-=5,3,7) : F.splice(j,1);									
				// draw bomb
				fillStyle = '#15f';
				(Z<H && U>0) ?  E(U -= 5*M.cos(U),Z+=3,5,5) :  U=Z=0 ;
				// move invaders
				i = I.length;				
				while (i--) 	 
					with (I[i]) {	
						// draw
						w = y+o;  
							//   invaders
							//   01110001001011000101001011111111100 v1
							//   01010101100111011111001110111111111 v2
							//   00110111111010110100011001010011111 v3	
						z=0;
						while(z++<A) {						
							if ('00111111111010110100011001010011111'.charAt(z)|0) E(x+5*(z%7),w+5*(z%5),5,5);
						}			
						// update position
						x += v*(M.log(l+1)+1/I.length);												
						// player dies when invaders reach earth or turet gots hit by bomb
						if ((w+B>H-13) || (Z==H && U>t && U<t+A)) k = 1;
						// colission with fire						
						j = F.length;						
						while (j--)
							if ((F[j].x>x && F[j].x<x+A) && (F[j].y>w && F[j].y<w+B)) {								
								F.splice(j,1);
								I.splice(i,1);
								if (U==0) U = t+9;
							}
						if (x>J) J=x;
						if (x<K) K=x;
					}				
				// pingpong invaders
				if (J>W-A || K<0) {
					v = -v;
					o += 4;						
				}							
			}
			// if there are no invaders 
			else {
				// create invaders
				j = 56;
				while(j--)
					I.push({x:60*(j%7),y:A*(j%8)+9});
				// start from the top
				o = 0;
				// on a faster level
				l++;
			}
		}
		// if we are dead
		else {
			// game over :)
			T('GAME OVER',W/2-A,H/2);
		}
	}
},1); 

// Controlls
u.onkeydown = function(event) {
	switch (event.keyCode) {
		// arrow left   -> move turet left
		case 37:				
			t -= A;
			break;
		// arrow right  -> move turet right
		case 39:						
			t += A;
			break;
		// space -> fire
		case 32:				
			(F.length<4) && F.push({x:t+17,y:H});
			break;
		// arrow up -> more speed						
		case 38:				
			l++;
			break;		
	}
}

// 	a wicked tune for playing a fast game: http://www.youtube.com/watch?v=GSR_g3thb24

JS1k: The JavaScript code golfing competition

2010 - The Original