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{
curPiece.setRandomShape();
curX = BoardWidth / 2 + 1;
curY = BoardHeight - 1 + curPiece.minY();

if (!tryMove(curPiece, curX, curY)) {
curPiece.setShape(Tetrominoes.NoShape);
timer.stop();
isStarted = false;
statusbar.setText("game over");
}
}

private boolean tryMove(Shape newPiece, int newX, int newY)
{
for (int i = 0; i < 4; ++i) {
int x = newX + newPiece.x(i);
int y = newY - newPiece.y(i);
if (x < 0 || x >= BoardWidth || y < 0 || y >= BoardHeight)
return false;
if (shapeAt(x, y) != Tetrominoes.NoShape)
return false;
}

curPiece = newPiece;
curX = newX;
curY = newY;
repaint();
return true;
}

public void removeFullLines()
{
int numFullLines = 0;

for (int i = BoardHeight - 1; i >= 0; --i) {
boolean lineIsFull = true;

for (int j = 0; j < BoardWidth; ++j) {
if (shapeAt(j, i) == Tetrominoes.NoShape) {
lineIsFull = false;
break;
}
}
if (lineIsFull) {

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