JS1k: The JavaScript code golfing competition

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

w = a.width; // canvas width
h = a.height; // canvas height
R = X = Z = S = 0; // playerRotation, playerX, playerZ, seed
K = []; // keypress array
r = e => Math.cos(S) * 10000 - Math.floor(Math.cos(S++) * 10000); // seeded RNG

c.lineWidth = 6;

document.onkeydown = e => K[e.which] = !0;
document.onkeyup = e => K[e.which] = !1;

setInterval(() => { // tick

	c.clearRect(0, 0, w, h);

	R += !!K[68] - !!K[65]; // rotate player
	R = ((R%360)+360)%360;
	
	Z += (!!K[87] - ! !K[83]) * 9 * Math.cos(R / 180 * 3.14); // move player
	X += (!!K[87] - !!K[83]) * 9 * Math.sin(R / 180 * 3.14);
	
	for(D=0;D<=25200;D++) {

		if(Math.abs(Math.sin(R / 180 * 3.14)) < .7) {
			I = Math.floor((Z-2885)/30)*30 + Math.floor(D/180)*30;
			J = Math.floor((X-3385)/30)*30 + D%180*30;
		}
		else {
			I = Math.floor((Z-2885)/30)*30 + D%140*30;
			J = Math.floor((X-3385)/30)*30 + Math.floor(D/140)*30;
		}
		
		if((Math.atan2(I-Z+700, J-X) * 180 / 3.14 + 222 + R)%360 < 263) continue;
		
		S = (I+J)*(I+J+1)/2+J; // set seed for current coordinate

		if(Math.abs(I - Math.sin(J*3.14/4000)*3000) < 99) { // path
			z = Math.sin(R / 180 * 3.14) * (J - X) + Math.cos(R / 180 * 3.14) * (I-Z+700) - 700; // Z axis of object
			c.save();
			c.globalCompositeOperation='destination-over';
			c.translate(w/2, h/2);
			c.scale(700 / (700 + z), 700 / (700 + z));
			c.translate(Math.cos(R / 180 * 3.14) * (J - X) - Math.sin(R / 180 * 3.14) * (I-Z+700), 40);
			c.fillStyle=c.strokeStyle=`hsl(${X / 200},74%,46%)`;
			c.fillRect(-25, -7, 50, 15); // draw squares that form the path
			c.restore()
		}
		else if(r()<Math.abs(Math.cos(I*3.14/20000)) / 20 && Math.abs(I - Math.sin(J*3.14/4000)*3000) > 200) { // trees	
			z = Math.sin(R / 180 * 3.14) * (J - X) + Math.cos(R / 180 * 3.14) * (I-Z+700) - 700; // Z axis of object
			
			c.save();

			if((Math.abs(Math.sin(R / 180 * 3.14)) < .7) && (I > Z-700) || !(Math.abs(Math.sin(R / 180 * 3.14)) < .7) && (J > X)) c.globalCompositeOperation='destination-over';
			else c.globalCompositeOperation='source-over';
			
			c.translate(w/2, h/2);
			c.scale(700 / (700 + z), 700 / (700 + z));
			c.translate(Math.cos(R / 180 * 3.14) * (J - X) - Math.sin(R / 180 * 3.14) * (I-Z+700), 45);

			x = y = 0;
			c.fillStyle=c.strokeStyle=`hsl(${X / 200},74%,${Math.min(50, Math.round((z+700) / 60) + 13)}%)`;

			c.beginPath();
			c.moveTo(x, y)
			c.lineTo(x+r()*6-3, y-=51+r()*9);
			c.lineTo(x+=r()*6-3, y-=51+r()*9);
			c.stroke();
			c.beginPath();
			C = r() * 3;
			for(i=6;i--;)
				c.lineTo(x + (35 + 5 * r()) * Math.sin(i * 3.14 / 3 + r() / 5 + C), y + (35 + 5 * r()) * Math.cos(i * 3.14 / 3 + r() / 5 + C));
			c.fill();
			c.restore()
		}
	}

	c.globalCompositeOperation='destination-over';

	c.fillStyle=c.strokeStyle=`hsl(${X / 200},74%,52%)`;
	c.fillRect(0, 0, w, h/2+12);

	c.fillStyle=c.strokeStyle=`hsl(${X / 200},74%,42%)`;
	c.fillRect(0, 0, w, h)

}, 16)