# Tetris/Mathematica

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Tetris/Mathematica is part of Tetris. You may find other members of Tetris at Category:Tetris.

CREDITS: this is a joint work by Boris F. and Nikita S. The program is started by calling Tetris[] from a blank input line. The cursor arrow keys are used to move, rotate, drop.

### Code

```(* ::Package::*)
BeginPackage["Tetris`"];

Tetris::usage = "Tetris[] starts game";

Begin["`Private`"];

{w, h} = {14, 26};
bg = {0, 0, 0}; (*background color*)
br = {.3, .3, .3}; (*border color*)
speed0 = .6; (*initial speed*)
fallspeed = 0.001;
acc = 0.8; (*speed acceleration factor*)
sounds = False;
lpl = 2; (*lines per level*)
sndbrick = Play[Sin[1000 t] + Cos[1100 t], {t, 0, .1}];
gomsg = "GAME OVER";
bcaption = "  New game  ";

figs =
{ (*figure:{coords, color}*)
{{{0, -1}, {0, 0}, {0, 1}, {1, -1}}, {0.1, 0.1, 1.0}} (*J*),
{{{0, -1}, {0, 0}, {0, 1}, {1, 1}}, {1.0, 0.5, 0.0}} (*L*),
{{{1, 0}, {0, 0}, {1, -1}, {0, 1}}, {1.0, 0.0, 0.0}} (*Z*),
{{{1, 0}, {0, 0}, {0, -1}, {1, 1}}, {0.1, 1.0, 0.1}} (*S*),
{{{0, 1}, {0, 0}, {0, 2}, {0, -1}}, {0.1, 0.9, 1.0}} (*I*),
{{{0, 0}, {1, 0}, {1, 1}, {0, 1}}, {1.0, 1.0, 0.1}} (*O*),
{{{0, -1}, {0, 0}, {0, 1}, {1, 0}}, {0.9, 0.1, 1.0}} (*T*)
};

init[] :=
(oldspeed = 0
; speed = speed0
; lines = score = level = 0
; glass = Table[If[1 < j < w && i > 1, bg, br], {i, h}, {j, w}]
; nextglass = Table[bg, {4}, {6}]
; fig7 = RandomSample@figs
; nfig = First@fig7
; fig7 = Rest@fig7
; playing = False
; benabled = True
; msg = ""
);

newfig[] :=
(put[nextglass, nfig[[1]], {2, 3}, bg]
; {fig, fc} = nfig
; nfig = First@fig7
; fig7 = Rest@fig7
; If[fig7 === {}, fig7 = RandomSample@figs]
; put[nextglass, nfig[[1]], {2, 3}, nfig[[2]]]
; {y, x} = {h - 3, Floor[w/2]}
; If[check[fig, {y, x}]
, put[glass, fig, {y, x}, fc]
, stop[]
; playing = False
; benabled = True
; msg = gomsg
; Return[]
];
If[oldspeed != 0
, stop[]
; speed = oldspeed
; oldspeed = 0
; start[]
];
);

rotate[f_] :=
If[f[[1]] == {0, 0}
, f
, {{0, -1}, {1, 0}}.# &  /@ f
];

SetAttributes[do, HoldAll];
do[act_] := If[playing, act];

move[] :=
If[check[fig, {y - 1, x}]
, put[glass, fig, {y, x}, bg]
; put[glass, fig, {--y, x}, fc]
, es@sndbrick
; del[]
; newfig[]
];

turn[] :=
Block[{newf},
newf = rotate@fig
; If[check[newf, {y, x}]
, put[glass, fig, {y, x}, bg]
; fig = newf
; put[glass, fig, {y, x}, fc]
];
];

shift[dx_] :=
If[check[fig, {y, x + dx}]
, put[glass, fig, {y, x}, bg]
; x += dx
; put[glass, fig, {y, x}, fc]
];

SetAttributes[es, HoldFirst];
es[s_] := If[sounds, EmitSound@s];

price[n_] := Switch[n, 1, 40, 2, 100, 3, 300, 4, 1200];

del[] := Module[{sel, g, ln},
sel = Not[Or @@ #] & /@ mask
; sel[[1]] = False
; g = Pick[glass, Not /@ sel]
; If[(ln = h - Length@g) > 0
, glass = g~Join~Table[If[1 < i < w, bg, br], {ln}, {i, w}]
; es@Play[UnitStep@Sin[2000 t] Sin[5000 t t], {t, 0, .2 (ln)}]
; lines += ln
; score += price[ln]*(level + 1)
; cl = Quotient[lines, lpl]
; If[cl > level
, level = cl
; stop[]
; speed *= acc
; oldspeed *= acc
; start[]]
];
];

SetAttributes[#, HoldFirst] & /@ {set, put};

set[g_, p_, c_] := (g[[Sequence @@ p]] = c);

put[g_, f_, p_, c_] := set[g, #, c] & /@ (# + p &  /@ f);

check[f_, p_] := And @@ (get /@ (# + p &  /@ f));

drop[] := If[speed != fallspeed
, stop[]
; playing = False
; oldspeed = speed
; speed = fallspeed
; start[]
; playing = True
];

, init[]
; newfig[]
; playing = True
; start[]
; benabled = False
, Enabled -> Dynamic@benabled
];

Tetris[] := DynamicModule[{},
init[];
EventHandler[
Graphics[
{Raster@Dynamic@glass[[;; -4]],
Raster[Dynamic@nextglass, {{w, h - 7}, {w + 6, h - 3}}],
Text[Style["Score", 24, White, Bold], {w, 17}, {-1, 0}],
Text[Style[Dynamic@score, 24, White, Bold], {w + 6, 17}, {1, 0}],
Text[Style["Lines", 24, Green, Bold], {w, 14}, {-1, 0}],
Text[Style[Dynamic@lines, 24, Green, Bold], {w + 6, 14}, {1, 0}],
Text[Style["Level", 24, Cyan, Bold], {w, 11}, {-1, 0}],
Text[Style[Dynamic@level, 24, Cyan, Bold], {w + 6, 11}, {1, 0}],
Text[Style[Dynamic@msg, 24, White, Bold], {w + 3, 7}, {0, 0}],
}
, PlotRange -> {{0, w + 7}, {0, h - 2}}
, Background -> RGBColor@br
, ImageSize -> 600
],
{"RightArrowKeyDown" :> do@shift@1
, "LeftArrowKeyDown" :> do@shift@-1
, "UpArrowKeyDown" :> do@turn[]
, "DownArrowKeyDown" :> do@drop[]
}
]
];

End[];

EndPackage[];
```