View difference between Paste ID: <a href="/xkuwHUKa">xkuwHUKa</a> and <a href="/CgxymNWf">CgxymNWf</a>

var canvas = document.getElementsByTagName('canvas')[0];
1		var canvas = document.getElementsByTagName('canvas')[0];
2		var context = canvas.getContext('2d');
3
4		document.body.bgColor = X = Y = H = I = J = E = Q = U = V = 0;
5		T = [l = 1];
6		C = (canvas.width = canvas.height = innerHeight) / 2;
7
8		setInterval(function() {
9		for (i = H; i < X + 1400; H = ++i) {
10		s = i % 800;
11		if (!s) {
12		/* Will run every once in a while to change direction and environment */
13		changeCounter = i / 800;
14		inclineAmount = changeCounter & 1 && -Q + (Q = Math.random() > 0.5); // Centered around 0.
15		turnAmount = !inclineAmount && changeCounter && (turnAmount + 2 + (Math.random() > 0.5)) % 3 - 1; //Centered around 0.
16		inStalCave = !inclineAmount && changeCounter > 9 && !inStalCave && Math.random() > 0.7; //Boolean.
17		W = 1.8 * Math.random() - 1;
18		}
19
20		F = (s < 160) - (s > 639);
21		E += F;
22
23		T[i % 1400] = [I += J, J += turnAmount, U += V, V = inclineAmount * E, !inclineAmount && Math.exp(-(L = i % 400 - 200) * L / 3000) / 1.5, i % 400, Math.random() > 0.95];
24		rectData = T[i % 1400];
25
26		if (!(i % 10)) {
27		Z = 9.8 + inStalCave * E / 15;
28		y = Z
29		z = W * inStalCave * E / 15;
30
31
32		/*
33		Rect info is stored in array rectData in the following order and repeated as many times as needed:
34		- X position (relative to centre)
35		- Init color (from white to black)
36		- Width from x
37		- Y position (relative to centre)
38		- Height from y
39		*/
40
41
42		/* Cave (literally just a circle) */
43		for (g = Math.random() / 6; g < 6.3; g += 2 / Z) {
44		if (inclineAmount \|\| inStalCave) {
45		if (Math.random() > 0.4) {
46		rectData.push(1.1 * Z * Math.cos(g + 11));
47		rectData.push(7 + inStalCave * 16, 4 - F);
48		rectData.push(Z * Math.cos(g) + 2 + z);
49		rectData.push(4 - F);
50		}
51		} else {
52		if (Math.random() > (Math.cos(g) > 0.5)) {
53		rectData.push(1.1 * Z * Math.cos(g + 11));
54		rectData.push(7 + inStalCave * 16);
55		rectData.push(4 - F, Z * Math.cos(g) + 2 + z);
56		rectData.push(4 - F);
57		}
58		}
59		}
60
61		t = 2 * Z * Math.random() - Z;
62		w = t * t * Math.random() / 6;
63
64		/* Stalactites and Stalagmites */
65		while (inStalCave * w > 0.2) {
66		rectData.push(t);
67		rectData.push(7 + inStalCave * 16);
68		rectData.push(w);
69		rectData.push(--y + z);
70		rectData.push(1.1);
71
72		rectData.push(t);
73		rectData.push(7 + inStalCave * 16);
74		rectData.push(w *= 0.8);
75		rectData.push(-y + z);
76		rectData.push(1.1);
77		}
78
79		/* I have no clue what this is */
80		if (!Q && (inStalCave * W > 0.6)) {
81		rectData.push(2 * Z * Math.random() - Z);
82		rectData.push(12);
83		rectData.push(0.2);
84		rectData.push(Z * Math.random() - Z / 2 + z);
85		rectData.push(1 + Math.random());
86		}
87
88		/* */
89		if (inStalCave && i % 20) {
90		rectData.push(-2);
91		rectData.push(22);
92		rectData.push(0.5);
93		rectData.push(-7);
94		rectData.push(Z - 8 - z);
95
96		rectData.push(2);
97		rectData.push(22);
98		rectData.push(0.5);
99		rectData.push(-7);
100		rectData.push(Z - 8 - z);
101		}
102
103		/* Horizontal bars on tracks */
104		if (!(i % 20)) {
105		rectData.push(0);
106		rectData.push(6);
107		rectData.push(6);
108		rectData.push(-6.8);
109		rectData.push(0.8);
110		}
111
112		/* Lamps */
113		if (!L) {
114		rectData.push(0);
115		rectData.push(7 + inStalCave * 16);
116		rectData.push(0.2);
117		rectData.push(Z + z);
118		rectData.push(Z + z - 5);
119
120		rectData.push(0);
121		rectData.push(7);
122		rectData.push(0.6);
123		rectData.push(5);
124		rectData.push(0.6);
125		}
126
127		/* Doorway thing */
128		if (!inclineAmount && !inStalCave) {
129		if (!(i % 40)) {
130		rectData.push(-6);
131		rectData.push(6);
132		rectData.push(1.5);
133		rectData.push(5);
134		rectData.push(14);
135
136		rectData.push(6);
137		rectData.push(6);
138		rectData.push(1.5);
139		rectData.push(5);
140		rectData.push(14);
141		}
142		if (!(i % 20)) {
143		rectData.push(0);
144		rectData.push(6);
145		rectData.push(17);
146		rectData.push(8);
147		rectData.push(3);
148		}
149		}
150		}
151
152		/* Train track (the metal part) */
153		if (!(i % 5)) {
154		/* Left */
155		rectData.push(-2);
156		rectData.push(6);
157		rectData.push(0.5);
158		rectData.push(-6.5);
159		rectData.push(0.6);
160
161		/* Right */
162		rectData.push(2);
163		rectData.push(6);
164		rectData.push(0.5);
165		rectData.push(-6.5);
166		rectData.push(0.6);
167		}
168		}
169		q = T[X % 1400];
170		while (true) {
171		d = --i - X;
172		if (!d)
173		break;
174		rectData = T[i % 1400];
175		f = C / (d / 10 + 3);
176		v = g = 0;
177		t = C + f * (rectData[g] - q[g++] - d * q[g++]) / 3000;
178		u = C + f * (rectData[g] - q[g++] - d * q[g++]) / 3000;
179
180		/* Light flicker. */
181		x = rectData[g++];
182		if (rectData[g++])
183		l = g++ && l;
184		else if (rectData[g++])
185		l = Math.random() > 0.3;
186		else
187		l = 1;
188		x *= l;
189
190		y = d / 1800;
191		while (true) {
192		z = f * rectData[g++];
193		w = rectData[g++];
194		if (!w)
195		break;
196
197		v != w && (v = w, context.fillStyle = 'hsl(0,0%,' + 16 * (w & 7) * (w & 8 \|\| y + x * (w < 16)) + '%)');
198
199		var rectX = t + z - (z = f * rectData[g++]) / 2;
200		var rectY = u - f * rectData[g++] + (w == 12 && f * 6 * Math.cos(g + X / 400));
201		var rectW = z;
202		var rectH = f * rectData[g++];
203
204		context.fillRect(rectX, rectY, rectW, rectH);
205		}
206		}
207		Y += 4 - 3 * Math.exp(-X / 400) + q[2] / 30000;
208		X = 0 \| Y;
209		}, 35);