JS1k: The JavaScript code golfing competition

for(H='&&~~(Zl.YYdX=YW)/VinU*r =(=0);c.y-x-);3399),(p) 0,Math.absX?(o=(Ya)*sU*cos=m+n,=m-n,1,m=-Xa.height	random()strokePI/2Style="#sqrt(x/rVbegUPath(filla.width
x=
;g=P=T=t=w=v=y=0;r=
/;onmousedown=a.onclick)=>{T=t};s=[{x:y:i:v:a:0}];(HF,u)=>{requestAnimationFrame(Hf=F-(t||FI=v*f;Rw+=f /1)*f;S=
/4;b=	/2;t=FRect(
,	for(l=s[0];Yx<=S+
;s.unshift(l))qWx+2 ,kWy+2 ,j=x>
?9*v/r+4*(Yv-yV
:-.1,0>):<(g?(.2-)*g:X)*~0<=-/2-g,g:(m=g++,o=mU(max(X?0:Ya+(-.5V3,-j/3*(1-j))pYa+oV2-,l={x:q,y:k,i:q+cos,v:k+(0<m?0:sUa:o,d:m}f"for(j=0;!u||u.x>S;u=l)l=s[j++],c.lUeTo(YS,YbOWa-,Q=(O-atan2(R,I)u~Q>~Q<3*ZM=tan,G=R/I,hWv-M*Yi,v?qG*hV(M-G):q=x,q<u.i~q>WiZk=M*q+h,e=q,N=k,e*e+N*N<I*I+R*RZm=v+w,n=.*(v-wvwo=x+I-q,p=y+R-k,m=o+p,n=-1,x=q,y=k,IRP=F,XZx=
,y)))(x+=I;y+=R;T~2>(T-P)Zw=-r/,P=Tc.arc(S,b,r,7)f"()Text("$"+(9-(y/r|0)S-r,b-2 )0"})(0';G=/[^!-T[-}]/.exec(H);)with(H.split(G))H=join(shift());eval(H)

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

// saves about 24 bytes
var COIN_SYMBOL = null;
var DRAW_SCORE = true;
// saves 19 bytes
var CENTER_SCORE = false;
var ALLOW_JUMPING = true;
var FLATTEN_AT_ZERO = false;
var ZERO = 999;
var FIX_VIEWPORT_WIDTH = 0; // 799
var FIX_VIEWPORT_HEIGHT = 0;
var FIX_COIN_SCALE = 0; // 9
var LINE_SCALE = 0; //0.2
var FONT_SCALE = 0; // 1.5
var DEADLY_SPIKES = true;
var FLATTEN_SPIKES = true;
var DEBUG_COLLISIONS = false;
var SLIGHTLY_SAFER_COLLISIONS = false;
var SLIGHTLY_SAFER_DEATHS = false;
var REGENERATE_ON_DEATH = false;
// #99* saves a byte due to compression
var GROUND_COLOR = '#99f'; //99f
// #*99 saves a byte due to compression
var COIN_COLOR = '#f99';
// #*33 saves a byte due to compression
var BACKGROUND_COLOR = '#330';
// saves 5 bytes
var MAX_MILLISECONDS_PER_FRAME = 0; //99 compresses well
var GOOD_TOUCH = false;
// true saves 5 bytes on GOOD_TOUCH, both false saves 17
var OK_TOUCH = true;
var RESTITUTION = .33;
var DISABLE_GRADIENT_EQUALITY_CHECK = true;
var LEVEL_GENERATION_SCALE_FACTOR = 2;
// TODO draw a spinning $ in the coin
// TODO glowing ground
// TODO collectible coins
// TODO buy/sell mode
//M = Math.abs;
//S = Math.sin;
//C = Math.cos;
//P = Math.PI;
if (FIX_VIEWPORT_HEIGHT && FIX_VIEWPORT_WIDTH) {
    a.width = FIX_VIEWPORT_WIDTH;
    a.height = FIX_VIEWPORT_HEIGHT;
}
else if (FIX_VIEWPORT_WIDTH) {
    a.height = FIX_VIEWPORT_WIDTH * a.height / a.width;
    a.width = FIX_VIEWPORT_WIDTH;
}
//let scale = canvasWidth / 50;
x = a.width;
y = 0;
v = 0;
w = 0;
t = 0;
T = 0;
L = 0;
g = 0;
if (FIX_COIN_SCALE) {
    r = FIX_COIN_SCALE;
}
else {
    r = a.width / 99;
}
if (ALLOW_JUMPING) {
    // have to add to canvas, otherwise it doesn't work on mobile
    if (GOOD_TOUCH) {
        onmousedown = a.ontouchstart = function () {
            T = t;
        };
    }
    else if (OK_TOUCH) {
        onmousedown = a.onclick = function () {
            T = t;
        };
    }
    else {
        a.onclick = function () {
            T = t;
        };
    }
}
s = [
    {
        x: 0,
        y: 0,
        u: 0,
        v: 0,
        a: 0
    }
];
if (LINE_SCALE) {
    c.lineWidth = Math.max(1, LINE_SCALE * r);
}
if (FONT_SCALE) {
    c.font = '' + Math.max(12, r * FONT_SCALE) + 'px serif';
}
(_ = function (now, nextPoint) {
    requestAnimationFrame(_);
    if (MAX_MILLISECONDS_PER_FRAME) {
        f = Math.min(now - (t || now), MAX_MILLISECONDS_PER_FRAME);
    }
    else {
        f = now - (t || now);
    }
    // gravity
    /*
    if( FIX_COIN_SCALE ) {
        w += f / 999;
    } else {
        w += (f * r) / 9999;
    }
    */
    // distance traveled
    D = v * f;
    U = (FIX_COIN_SCALE ? w += f / 6999 : w += (f * r) / 13399) * f;
    // camera bounds
    X = x - a.width / 4;
    Y = y - a.height / 2;
    t = now;
    // clear screen
    c.fillRect(0, 0, a.width, a.height);
    // fill in the surfaces
    for (l = s[0]; l.x <= X + a.width; s.unshift(l)) {
        q = l.x + Math.cos(l.a) * (LEVEL_GENERATION_SCALE_FACTOR ? r * LEVEL_GENERATION_SCALE_FACTOR : r);
        // add in more lines
        k = l.y + Math.sin(l.a) * (LEVEL_GENERATION_SCALE_FACTOR ? r * LEVEL_GENERATION_SCALE_FACTOR : r);
        if (!FIX_COIN_SCALE) {
            j = x > a.width ? v * 9 / r + (l.v - y) * 4 / a.width : -.1;
        }
        else {
            // TODO not sure this forumla is right
            j = x > a.width ? v + (l.v - y - 20) / 33 : 0;
        }
        if (DEADLY_SPIKES && l.d < 0) {
            o = 1; // PI/3
            m = -l.d;
        }
        else if (DEADLY_SPIKES && Math.random() < (g ? (.2 - Math.abs(l.a)) * g : l.d) * Math.sqrt(x / r) / 3399 && l.d >= 0) {
            o = -1; //-PI/3
            m = -l.d / 2 - g;
            g = 0;
        }
        else {
            if (DEADLY_SPIKES) {
                m = 0;
                g++;
            }
            if (FLATTEN_AT_ZERO && k > ZERO / r) {
                o = 0;
            }
            else {
                o = Math.min(Math.max(l.d ? 0 : l.a + (Math.random() - .5) / 3, -j / 3), (Math.sqrt(x / r) / 33) * (1 - j));
            }
        }
        p = (l.a + o) / 2 - Math.PI / 2;
        if (DEADLY_SPIKES) {
            l = {
                x: q,
                y: k,
                u: q + Math.cos(p) * r,
                v: k + (m > 0 && FLATTEN_SPIKES ? 0 : Math.sin(p) * r),
                a: o,
                d: m
            };
        }
        else {
            l = {
                x: q,
                y: k,
                u: q + Math.cos(p) * r,
                v: k + Math.sin(p) * r,
                a: o
            };
        }
    }
    // draw in the surface and collide as neccessary 
    //F = Math.atan2(U, D);
    c.strokeStyle = GROUND_COLOR;
    c.beginPath();
    for (j = 0; !nextPoint || nextPoint.x > X; nextPoint = l) {
        l = s[j++];
        c.lineTo(l.x - X, l.y - Y);
        O = l.a - Math.PI / 2;
        Q = Math.abs(O - Math.atan2(U, D));
        if (nextPoint && Q > Math.PI / 2 && Q < Math.PI * 3 / 2) {
            // check for collision
            K = Math.tan(l.a);
            G = U / D;
            if (DISABLE_GRADIENT_EQUALITY_CHECK || K != G) {
                Z = l.v - K * l.u;
                if (v) {
                    q = ((y - G * x) - Z) / (K - G);
                }
                else {
                    q = x;
                }
                // is it in bounds of the line?
                if (
                // x always goes from right to left
                q < nextPoint.u && q >= l.u) {
                    k = K * q + Z;
                    e = x - q;
                    z = y - k;
                    if ((e * e) + (z * z) < (D * D) + (U * U)) {
                        // bounce off
                        //h = Math.sin(l.a);
                        //g = Math.cos(l.a);
                        m = v * Math.cos(l.a) + w * Math.sin(l.a);
                        if (RESTITUTION) {
                            n = (v * Math.sin(l.a) - w * Math.cos(l.a)) * RESTITUTION;
                        }
                        else {
                            n = 0;
                        }
                        v = m * Math.cos(l.a) - n * Math.sin(l.a);
                        w = m * Math.sin(l.a) + n * Math.cos(l.a);
                        o = x + D - q;
                        p = y + U - k;
                        m = o * Math.cos(l.a) + p * Math.sin(l.a);
                        // elevate slightly to avoid falling through ground
                        if (SLIGHTLY_SAFER_COLLISIONS) {
                            n = -Math.sqrt(Math.abs(m)) - .1;
                        }
                        else {
                            n = -1;
                        }
                        x = q;
                        y = k;
                        D = m * Math.cos(l.a) - n * Math.sin(l.a);
                        U = m * Math.sin(l.a) + n * Math.cos(l.a);
                        L = now;
                        if (DEADLY_SPIKES && l.d) {
                            x = a.width;
                            y = 0;
                            if (SLIGHTLY_SAFER_DEATHS) {
                                if (REGENERATE_ON_DEATH) {
                                    w = 0;
                                    v = 0;
                                    s.splice(0, s.length - 1);
                                }
                                break;
                            }
                        }
                    }
                }
            }
        }
    }
    c.stroke();
    x += D;
    y += U;
    if (ALLOW_JUMPING && T && Math.abs(T - L) < 233) {
        if (FIX_COIN_SCALE) {
            w = -FIX_COIN_SCALE / 99;
        }
        else {
            w = -r / 33;
            //w -= 0.5;
        }
        T = 0;
        L = 0;
    }
    // debug collision bounds
    if (DEBUG_COLLISIONS) {
        c.strokeStyle = '#F00';
        c.beginPath();
        j = 0;
        do {
            l = s[j];
            j++;
            c.lineTo(l.u - X, l.v - Y);
            nextPoint = l;
        } while (nextPoint.x > X);
        c.stroke();
    }
    // draw player
    c.beginPath();
    c.arc(x - X, y - Y, r, 0, 7);
    if (COIN_COLOR) {
        c.fillStyle = COIN_COLOR;
        c.fill();
        if (DRAW_SCORE) {
            if (CENTER_SCORE) {
                c.textAlign = 'center';
                c.fillText('$' + (ZERO - (y / r | 0)), x - X, y - Y - r * 2);
            }
            else {
                c.fillText('$' + (ZERO - (y / r | 0)), x - X - r, y - Y - r * 2);
            }
        }
        c.fillStyle = BACKGROUND_COLOR;
        if (COIN_SYMBOL) {
            c.fillText(COIN_SYMBOL, x - X - r / 2, y - Y + r / 2);
        }
    }
    else {
        if (BACKGROUND_COLOR) {
            c.fillStyle = BACKGROUND_COLOR;
        }
        c.stroke();
    }
})(0);