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

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        ** This file is part of the documentation of the Qt Toolkit.
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        #include <QtCore>

        #include <stdlib.h>

        #include "tetrixpiece.h"

        void TetrixPiece::setRandomShape()
        {
            setShape(TetrixShape(rand() % 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;
        }