function S(f,n,e,i,t){for(V=8;V--;)for(U=8;U--;)"MKJELCHAHALCBDAHLCHALCJEIIDBBDBD@@@@LCNGNGOOOOAHLIHHNONOH@LA@@@@".charCodeAt(16*f+2*V+(U>>2))-64&1<<(3&U)&&C.F(4*n-U*i,2*e+V*t,i,t)}w=a.width=640,h=a.height=480,M=Math,R=M.random,x=y=j=u=s=k=f=m=z=v=p=0,n=w,B=400,L="fillStyle",A=new window.AudioContext,O=A.createOscillator(),G=A.createGain(),O.type="square",O.connect(G),G.connect(A.destination),O.start(),onkeydown=function(f){k=f.keyCode},onkeyup=function(f){k=0},setInterval(function(){with(O.frequency.value=f,C=a.getContext("2d"))C.F=fillRect,n++,n>200&&(l=4,n=0,s=0,m=32|127*R(),z=32|127*R(),v=(3*R()&3)-1),C[L]="#4169E1",F(0,0,w,h),C[L]="Green",F(0,B,w,h),C[L]="White",u=u+v&255,S(2,u,5,64,4),C[L]="Yellow",S(3,n,m,8,4),F(4*z-44,B,64,8),(s<5||f>2e5)&&(f=0),f*=2,p=0,37==k&&(p=-1),39==k&&(p=1),32==k&&(k=0,1==s&&(s=2,f=226),0==s&&(x=n,y=m+16,s=1,f=h)),s>0&&(2==s&&(y++,x+=p+v,j=0,S(2,x,y-16,4,4),y>=184&&(s=4,f=113,x>z-5&&x<z+5&&(f=h,s=5))),1==s&&(y+=4,x++,j=1-j&1,y>=184&&(l=1,s=3,y=198,f=50)),S(j,x,y,4,l))},40);
/*
* a = <canvas>
* b = <body>
* c = canvas context 2D
* d = document
* e
* f = frequency of sound
* g = web gl??????
* h = height of canvas = 480
* i
* j = jump man
* k = key code
* l = jump man pixel height
* m = plane X location
* n = plane Y location
* o
* p = parachute control
* q
* r
* s = game state
* t
* u = cloud X location
* v = cloud velocity
* w = width of canvas = 680
* x = jumper X location
* y = jumper Y location
* z = platform X location
*/
/*
* A = audio context for web audio
* B = 400
* C = 'context'
* D
* E
* F = reserved
* G = audio gainModule
* H = Frequency
* I
* J
* K
* L = 'fillStyle'
* M = Math
* N
* O = oscillator
* P = sprite width multiplier
* Q = sprite height multiplier
* R = Random
* S = sprite function
* T = sprite index
* U = X loop iterator
* V = Y loop iterator
* W = X nibble loop iterator
* X = sprite X location
* Y = sprite Y location
* Z
*/
// Resize the canvas, storing width and height for later use.
w = a.width = 640;
h = a.height = 480;
// Some short-hands for Math and Math.random.
M=Math;
R=M.random;
// Renders sprite type T at X, Y with width Z
function S(T, X, Y, P, Q)
{
// Loop over the pixels in the image.
for (V = 8; V--;)
for (U = 8; U--;)
// Add pixel width to function
// This is a string containing 6 8x8 sprite graphics. One
// character encodes a single 4-pixel row. This allows all
// to be represented by visable ascii characters: @ABCDEFGHIJKLMNO
(
'MKJELCHAHALCBDAHLCHALCJEIIDBBDBD@@@@LCNGNGOOOOAHLIHHNONOH@LA@@@@'
// Extract the bit we need for the current pixel.
.charCodeAt(T * 16 + V * 2 + (U>>2)) - 64) & 1<<(U&3)
// Non zero bits are drawn as visiable pixels
// few units of the coords in order to center the image on the
// given x,y. (context.F is context.fillRect)
&& C.F(X * 4 - U * P, Y * 2 + V * Q, P, Q)
}
// global variables
x = y = j = u = s = k = f = m = z = v = p = 0;
n = w
B = 400
L = 'fillStyle'
// web audio API to generate sound
A = new window.AudioContext;
O = A.createOscillator();
G = A.createGain();
O.type = 'square';
O.connect(G);
G.connect(A.destination);
//G.gain.value = 0.2;
// sound off
//O.frequency.value = 0;
O.start();
// sounds
// SOUND_JUMP = 226
// SOUND_CHUTE = 459
// SOUND_SPLAT = 50
// SOUND_LAND = 113
// SOUND_PLATFORM = 490
// SOUND_SCORE1 = 980
// SOUND_SCORE2 = 1960
// sprites
// SPRITE_LAND = 0
// SRITE_STAND = 1
// SPRITE_CHUTE = 2
// SPRITE_PLANE = 3
// states
// READY = 0;
// FALLING = 1;
// CHUTE = 2;
// SPLAT = 3;
// LANDING = 4;
// SCORE = 5;
onkeydown = function(event)
{
k = event.keyCode;
}
onkeyup = function(event)
{
k = 0;
}
// The interval code was a string, but is made into a function here to
// allow newlines to be used inside of it.
setInterval(function()
{
O.frequency.value = f;
with(C = a.getContext('2d'))
{
// Create a shortcut for fillRect
C.F = fillRect;
n++;
// END_TIME = 200;
if (n > 200)
{
// jump man height = 4
l = 4;
n = 0;
// READY = 0;
s = 0;
// random numbers with floor function
// 25 to 125
m = 32|R()*127;
// 80 to 140
z = 32|R()*127;
// -1, 0, 1
// v = 1-(0|R()*2.9);
v = (R()*3&3)-1;
}
// RoyalBlue sky background
C[L] = '#4169E1';
// Clear the screen (F is fillRect)
F(0, 0, w, h);
// green grass background
C[L] = 'Green';
F(0, B, w, h);
// wite clouds
C[L] = 'White';
// screen cloud roll over at ends of screen
u = (u + v)& 255;
// SPRITE_CLOUD uses SPRITE_CHUTE = 2
S(2, u, 5, 64, 4);
C[L] = 'Yellow';
// SPRITE_PLANE = 3
S(3, n, m, 8, 4);
// platform to land on
F(z * 4 - 44, B, 64, 8);
// SCORE = 5;
// All sounds except score are blips or bleeps so they only last
//one cycle
if ((s < 5) || (f>2e5))
{
f = 0;
}
// a score is landing on the platform, the sound goes up in frequency
// this just lets it keep on going since it is in audable > 20kHz
f *= 2;
// parachute control
p = 0;
//test for ARROW_LEFT = 37;
if (k == 37)
{
p = -1;
}
//test for ARROW_RIGHT = 39;
if (k == 39)
{
p = 1;
}
//test for SPACE_BAR = 32;
if (k == 32)
{
k = 0;
// FALLING = 1;
if (s == 1)
{
// CHUTE = 2;
s = 2;
// SOUND_JUMP = 226
// O.frequency.value = 226;
f = 226;
}
// READY = 0;
if (s == 0)
{
x = n;
y = m + 16;
// FALLING = 1;
s = 1;
// SOUND_CHUTE = 459
// O.frequency.value = 459;
f = h;
}
}
// READY = 0;
if (s > 0)
{
// CHUTE = 2;
if (s == 2)
{
y++;
x += p +v;
// SPRITE_LAND = 0
j = 0;
// SPRITE_CHUTE = 2
S(2, x, y - 16, 4, 4);
// GROUND_Y = 184;
if (y >= 184)
{
// LANDING = 4;
s = 4;
// SOUND_LAND = 113
//O.frequency.value = 113;
f = 113;
// test for landin on platform
// PLATFORM_WIDTH = 4;
if ((x > z - 5) && (x < z + 5))
{
// SOUND_PLATFORM = 490
// O.frequency.value = 490;
f = h;
// SCORE = 5;
s = 5;
}
}
}
// FALLING = 1;
if (s == 1)
{
y += 4;
x++;
j = (1 - j) & 1;
// GROUND_Y = 184;
if (y >= 184)
{
// jump man height = 1
l = 1;
// SPLAT = 3;
s = 3;
// move sprite to ground
y = 198;
// SOUND_SPLAT = 50
// O.frequency.value = 50;
f = 50;
}
}
S(j, x, y, 4, l);
}
// S(1, 20 - 5, B/2 - 16, 4, 4);
// F(20 * 4 - 44, B, 64, 8);
// fillText('plane y: ' + m, 40, 420);
// fillText('platform x: ' + z, 40, 440);
// fillText('wind speed: ' + v, 40, 460);
}
}, 40); // 25 frames per second
