JS1k: The JavaScript code golfing competition

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

// Elemental master (Mar/13/2016) by Oscar Toledo G. http://nanochess.org/
        // Catch the yellow atoms, don't touch the red ones.
        // Use keyboard or touch your screen.
        // Size
        W = a.width / 2,
        H = a.height / 2,
        Z = W > H ? H : W,
        // Coming elements, lifes / difficulty
        O = [{t:2,d:L=R=1}],
        // Time for next one
        Q = new Date().valueOf() + 1e3,
        // Score
        S = 0,
        // Start angle
        G = 4,
        // Keys
        K = [];
        // Compression of <canvas> function names
        for(M in c)c[M[0]+(M[6]||M[2])]=c[M];
        
        onkeydown = function(w){K[w.which-37] = 1};
        a.addEventListener("touchstart", function(w){K[w.touches[0].clientX<width?0:2]=1}, 0);
        
        setInterval(function(w){
                    with (Math) {
                    P = PI / 18;
                    with(c){
                    sv(),
                    // Clear canvas
                    fc(0, 0, W*2, H*2),
                    // Show score
                    strokeStyle = shadowColor = "#0f0",
                    shadowBlur = 5,
                    lineCap = "round",
                    sT("Score: " + S, 16, 16),
                    // Prepare rotated canvas
                    ta(W, H),
                    rt(G * P - P * 4.5),
                    sa(Z, Z * .8),
                    // Draw border
                    U = new Date().valueOf(),
                    strokeStyle = "#" + (999 - U / 250 % 900 | 0),
                    i = .3 + U / 2e3 % .1;
                    while (i < 1)
                    lineWidth = 4 * i / Z,
                    ba(),
                    ac(0, 0, i, 0, P * 36),
                    sr(),
                    i += i / 4;
                    // Draw perspective lines
                    ba(),
                    lineWidth = 2 / Z,
                    i = P * 27;
                    while (i < P * 46)
                    mv(0, 0),
                    ln(sin(i), cos(i)),
                    i += P * 2;
                    sr(),
                    // Move player
                    K[0] && G && --G,
                    K[2] && G < 9 && ++G,
                    K[0] = K[2] = 0,
                    // Draw atoms
                    O[0].x = G,
                    j = O.length;
                    while (j-- > (L > 3))
                    fillStyle = "#f00#ff0#08f".substr(O[j].t * 4, 4),
                    i = O[j].x * P * 2 + P * 27,
                    ba(),
                    ac(sin(i) / O[j].d, cos(i) / O[j].d, 25 / Z / (j ? O[j].d : L), 0, P * 36),
                    fl(),
                    j && (O[j].d -= (U - T) / 60) < 1 && (
                    O[j].x == G & L < 3.5 ? O[j].t ? S++ : (L += .5) : 0, O.splice(j, 1));
                    
                    re(),
                    T = U,
                    // Add new atoms
                    Q < T &&
                    (Q = T + random() * (L < 3.5 ? 1e3 / R : 100),
                    O[O.length] = {x: random() * 10 | 0, d: 25, t: random() > .7 | 0},
                     R += 1e-4);
                    }}
                    }, 15);