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								! Copyright (C) 2006, 2007, 2008 Alex Chapman
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								! See http://factorcode.org/license.txt for BSD license.
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								USING: kernel arrays namespaces sequences math math.order
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								math.vectors colors colors.constants random ;
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								IN: tetris.tetromino
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								TUPLE: tetromino states colour ;
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								C: <tetromino> tetromino
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								SYMBOL: tetrominoes
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								{
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								  [
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								    { {
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								        { 0 0 } { 1 0 } { 2 0 } { 3 0 }
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								      } 
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								      { { 0 0 }
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								        { 0 1 }
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								        { 0 2 }
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								        { 0 3 }
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								      }
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								    } COLOR: cyan
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								  ] [
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								    {
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								      {         { 1 0 }
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								        { 0 1 } { 1 1 } { 2 1 }
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								      } {
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								        { 0 0 }
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								        { 0 1 } { 1 1 }
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								        { 0 2 }
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								      } {
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								        { 0 0 } { 1 0 } { 2 0 }
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								                { 1 1 }
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								      } {
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								                { 1 0 }
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								        { 0 1 } { 1 1 }
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								                { 1 2 }
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								      }
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								    } COLOR: purple
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								  ] [
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								    { { { 0 0 } { 1 0 }
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								        { 0 1 } { 1 1 } }
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								    } COLOR: yellow
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								  ] [
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								    {
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								      { { 0 0 } { 1 0 } { 2 0 }
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								        { 0 1 }
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								      } {
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								        { 0 0 } { 1 0 }
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								                { 1 1 }
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								                { 1 2 }
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								      } {
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								                        { 2 0 }
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								        { 0 1 } { 1 1 } { 2 1 }
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								      } {
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								        { 0 0 }
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								        { 0 1 }
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								        { 0 2 } { 1 2 }
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								      }
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								    } COLOR: orange
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								  ] [
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								    { 
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								      { { 0 0 } { 1 0 } { 2 0 }
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								                        { 2 1 }
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								      } {
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								                { 1 0 }
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								                { 1 1 }
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								        { 0 2 } { 1 2 }
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								      } {
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								        { 0 0 }
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								        { 0 1 } { 1 1 } { 2 1 }
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								      } {
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								        { 0 0 } { 1 0 }
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								        { 0 1 }
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								        { 0 2 }
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								      }
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								    } COLOR: blue
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								  ] [
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								    {
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								      {          { 1 0 } { 2 0 }
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								        { 0 1 } { 1 1 }
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								      } {
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								        { 0 0 }
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								        { 0 1 } { 1 1 }
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								                { 1 2 }
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								      }
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								    } COLOR: green
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								  ] [
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								    {
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								      {
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								        { 0 0 } { 1 0 }
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								                { 1 1 } { 2 1 }
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								      } {
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								                { 1 0 }
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								        { 0 1 } { 1 1 }
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								        { 0 2 }
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								      }
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								    } COLOR: red
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								  ]
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								} [ first2 <tetromino> ] map tetrominoes set-global
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								: random-tetromino ( -- tetromino )
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								    tetrominoes get random ;
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								: blocks-max ( blocks quot -- max )
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								    map [ 1 + ] [ max ] map-reduce ; inline
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								: blocks-width ( blocks -- width )
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								    [ first ] blocks-max ;
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								: blocks-height ( blocks -- height )
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								    [ second ] blocks-max ;
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