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# tetrixboard.js Example File
script/qstetrix/tetrixboard.js

     function TetrixBoard(ui)
     {
         this.ui = ui;

         this.isStarted = false;
         this.isPaused = false;
         this.inKeyPress = false;

         this._board = new Array(TetrixBoard.BoardWidth * TetrixBoard.BoardHeight);
         this.clearBoard();

         this.curPiece = new TetrixPiece();
         this.nextPiece = new TetrixPiece();
         this.nextPiece.setRandomShape();

         ui.timer.singleShot = true;
         ui.timer.timeout.connect(this, this.onTimer);
         ui.keyPressed.connect(this, this.onKeyPress);
         ui.paintRequested.connect(this, this.onPaint);
         ui.paintNextPieceRequested.connect(this, this.onPaintNextPiece);
     }

     TetrixBoard.BoardWidth = 10;
     TetrixBoard.BoardHeight = 22;

     TetrixBoard.prototype.start = function() {
         if (this.isPaused)
             return;

         this.isStarted = true;
         this.isWaitingAfterLine = false;
         this.numLinesRemoved = 0;
         this.numPiecesDropped = 0;
         this.score = 0;
         this.level = 1;
         this.clearBoard();

         this.ui.linesRemovedChanged(this.numLinesRemoved);
         this.ui.scoreChanged(this.score);
         this.ui.levelChanged(this.level);

         this.newPiece();
         this.ui.timer.start(this.timeoutTime());
     }

     TetrixBoard.prototype.pause = function() {
         if (!this.isStarted)
             return;

         this.isPaused = !this.isPaused;
         if (this.isPaused) {
             this.ui.timer.stop();
         } else {
             this.ui.timer.start(this.timeoutTime());
         }
         this.ui.update();
     }

     TetrixBoard.prototype.getShapeAt = function(x, y) {
         return this._board[(y * TetrixBoard.BoardWidth) + x];
     }

     TetrixBoard.prototype.setShapeAt = function(x, y, newShape) {
         this._board[(y * TetrixBoard.BoardWidth) + x] = newShape;
     }

     TetrixBoard.prototype.clearBoard = function() {
         for (var i = 0; i < TetrixBoard.BoardHeight * TetrixBoard.BoardWidth; ++i)
             this._board[i] = TetrixShape.NoShape;
     }

     TetrixBoard.prototype.dropDown = function() {
         var dropHeight = 0;
         var newY = this.curY;
         while (newY > 0) {
             if (!this.tryMove(this.curPiece, this.curX, newY - 1))
                 break;
             --newY;
             ++dropHeight;
         }
         this.pieceDropped(dropHeight);
     }

     TetrixBoard.prototype.oneLineDown = function() {
         if (!this.tryMove(this.curPiece, this.curX, this.curY - 1))
             this.pieceDropped(0);
     }

     TetrixBoard.prototype.pieceDropped = function(dropHeight) {
         for (var i = 0; i < 4; ++i) {
             var x = this.curX + this.curPiece.getX(i);
             var y = this.curY - this.curPiece.getY(i);
             this.setShapeAt(x, y, this.curPiece.shape);
         }

         ++this.numPiecesDropped;
         if ((this.numPiecesDropped % 25) == 0) {
             ++this.level;
             this.ui.timer.start(this.timeoutTime());
             this.ui.levelChanged(this.level);
         }

         this.score += dropHeight + 7;
         this.ui.scoreChanged(this.score);
         this.removeFullLines();

         if (!this.isWaitingAfterLine)
             this.newPiece();

         if (this.isStarted && !this.ui.timer.active)
             this.ui.timer.start(this.timeoutTime());
     }

     TetrixBoard.prototype.removeFullLines = function() {
         var numFullLines = 0;

         for (var i = TetrixBoard.BoardHeight - 1; i >= 0; --i) {
             var lineIsFull = true;

             for (var j = 0; j < TetrixBoard.BoardWidth; ++j) {
                 if (this.getShapeAt(j, i) == TetrixShape.NoShape) {
                     lineIsFull = false;
                     break;
                 }
             }

             if (lineIsFull) {
                 ++numFullLines;
                 for (var k = i; k < TetrixBoard.BoardHeight - 1; ++k) {
                     for (var j = 0; j < TetrixBoard.BoardWidth; ++j)
                         this.setShapeAt(j, k, this.getShapeAt(j, k + 1));
                 }
                 for (var j = 0; j < TetrixBoard.BoardWidth; ++j)
                     this.setShapeAt(j, TetrixBoard.BoardHeight - 1, TetrixShape.NoShape);
             }
         }

         if (numFullLines > 0) {
             this.numLinesRemoved += numFullLines;
             this.score += 10 * numFullLines;
             this.ui.linesRemovedChanged(this.numLinesRemoved);
             this.ui.scoreChanged(this.score);

             this.ui.timer.start(500);
             this.isWaitingAfterLine = true;
             this.curPiece.shape = TetrixShape.NoShape;
             this.ui.update();
         }
     }

     TetrixBoard.prototype.newPiece = function() {
         this.curPiece = this.nextPiece;
         this.nextPiece = new TetrixPiece();
         this.nextPiece.setRandomShape();
         this.ui.showNextPiece(this.nextPiece.maxX - this.nextPiece.minX + 1,
                               this.nextPiece.maxY - this.nextPiece.minY + 1);
         this.curX = TetrixBoard.BoardWidth / 2 + 1;
         this.curY = TetrixBoard.BoardHeight - 1 + this.curPiece.minY;

         if (!this.tryMove(this.curPiece, this.curX, this.curY)) {
             this.curPiece.shape = TetrixShape.NoShape;
             this.ui.timer.stop();
             this.isStarted = false;
         }
     }

     TetrixBoard.prototype.tryMove = function(newPiece, newX, newY) {
         for (var i = 0; i < 4; ++i) {
             var x = newX + newPiece.getX(i);
             var y = newY - newPiece.getY(i);
             if ((x < 0) || (x >= TetrixBoard.BoardWidth) || (y < 0) || (y >= TetrixBoard.BoardHeight))
                 return false;
             if (this.getShapeAt(x, y) != TetrixShape.NoShape)
                 return false;
         }

         this.curPiece = newPiece;
         this.curX = newX;
         this.curY = newY;
         this.ui.update();
         return true;
     }

     TetrixBoard.prototype.onPaint = function(painter) {
         if (this.isPaused) {
             this.ui.drawPauseScreen(painter);
             return;
         }

         for (var i = 0; i < TetrixBoard.BoardHeight; ++i) {
             for (var j = 0; j < TetrixBoard.BoardWidth; ++j) {
                 var shape = this.getShapeAt(j, TetrixBoard.BoardHeight - i - 1);
                 if (shape != TetrixShape.NoShape)
                     this.ui.drawSquare(painter, j, i, shape);
             }
         }

         if (this.curPiece.shape != TetrixShape.NoShape) {
             for (var i = 0; i < 4; ++i) {
                 var x = this.curX + this.curPiece.getX(i);
                 var y = this.curY - this.curPiece.getY(i);
                 this.ui.drawSquare(painter, x, TetrixBoard.BoardHeight - y - 1,
                                    this.curPiece.shape);
             }
         }
     }

     TetrixBoard.prototype.onPaintNextPiece = function(painter) {
         for (var i = 0; i < 4; ++i) {
             var x = this.nextPiece.getX(i) - this.nextPiece.minX;
             var y = this.nextPiece.getY(i) - this.nextPiece.minY;
             this.ui.drawSquare(painter, x, y, this.nextPiece.shape);
         }
     }

     TetrixBoard.prototype.onKeyPress = function(key) {
         if (!this.isStarted || this.isPaused || (this.curPiece.shape == TetrixShape.NoShape))
             return;
         this.inKeyPress = true;
         switch (key) {
             case Qt.Key_Left:
                 this.tryMove(this.curPiece, this.curX - 1, this.curY);
                 break;
             case Qt.Key_Right:
                 this.tryMove(this.curPiece, this.curX + 1, this.curY);
                 break;
             case Qt.Key_Down:
                 this.tryMove(this.curPiece.rotatedRight(), this.curX, this.curY);
                 break;
             case Qt.Key_Up:
                 this.tryMove(this.curPiece.rotatedLeft(), this.curX, this.curY);
                 break;
             case Qt.Key_Space:
                 this.dropDown();
                 break;
             case Qt.Key_D:
                 this.oneLineDown();
                 break;
         }
         this.inKeyPress = false;
         if (this.isStarted && !this.ui.timer.active)
             this.ui.timer.start(this.timeoutTime());
     }

     TetrixBoard.prototype.onTimer = function() {
         if (this.isWaitingAfterLine) {
             this.isWaitingAfterLine = false;
             this.newPiece();
             this.ui.timer.start(this.timeoutTime());
         } else {
             if (!this.inKeyPress) {
                 this.oneLineDown();
                 if (this.isStarted && !this.ui.timer.active)
                     this.ui.timer.start(this.timeoutTime());
             }
         }
     }

     TetrixBoard.prototype.timeoutTime = function() {
         return 1000 / (1 + this.level);
     }