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# tetrixpiece.cpp Example File
widgets/tetrix/tetrixpiece.cpp

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     #include <QtCore>

     #include <stdlib.h>

     #include "tetrixpiece.h"

     void TetrixPiece::setRandomShape()
     {
         setShape(TetrixShape(qrand() % 7 + 1));
     }

     void TetrixPiece::setShape(TetrixShape shape)
     {
         static const int coordsTable[8][4][2] = {
             { { 0, 0 },   { 0, 0 },   { 0, 0 },   { 0, 0 } },
             { { 0, -1 },  { 0, 0 },   { -1, 0 },  { -1, 1 } },
             { { 0, -1 },  { 0, 0 },   { 1, 0 },   { 1, 1 } },
             { { 0, -1 },  { 0, 0 },   { 0, 1 },   { 0, 2 } },
             { { -1, 0 },  { 0, 0 },   { 1, 0 },   { 0, 1 } },
             { { 0, 0 },   { 1, 0 },   { 0, 1 },   { 1, 1 } },
             { { -1, -1 }, { 0, -1 },  { 0, 0 },   { 0, 1 } },
             { { 1, -1 },  { 0, -1 },  { 0, 0 },   { 0, 1 } }
         };

         for (int i = 0; i < 4 ; i++) {
             for (int j = 0; j < 2; ++j)
                 coords[i][j] = coordsTable[shape][i][j];
         }
         pieceShape = shape;
     }

     int TetrixPiece::minX() const
     {
         int min = coords[0][0];
         for (int i = 1; i < 4; ++i)
             min = qMin(min, coords[i][0]);
         return min;
     }

     int TetrixPiece::maxX() const
     {
         int max = coords[0][0];
         for (int i = 1; i < 4; ++i)
             max = qMax(max, coords[i][0]);
         return max;
     }

     int TetrixPiece::minY() const
     {
         int min = coords[0][1];
         for (int i = 1; i < 4; ++i)
             min = qMin(min, coords[i][1]);
         return min;
     }

     int TetrixPiece::maxY() const
     {
         int max = coords[0][1];
         for (int i = 1; i < 4; ++i)
             max = qMax(max, coords[i][1]);
         return max;
     }

     TetrixPiece TetrixPiece::rotatedLeft() const
     {
         if (pieceShape == SquareShape)
             return *this;

         TetrixPiece result;
         result.pieceShape = pieceShape;
         for (int i = 0; i < 4; ++i) {
             result.setX(i, y(i));
             result.setY(i, -x(i));
         }
         return result;
     }

     TetrixPiece TetrixPiece::rotatedRight() const
     {
         if (pieceShape == SquareShape)
             return *this;

         TetrixPiece result;
         result.pieceShape = pieceShape;
         for (int i = 0; i < 4; ++i) {
             result.setX(i, -y(i));
             result.setY(i, x(i));
         }
         return result;
     }