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isStarted = true;
isFallingFinished = false;
numLinesRemoved = 0;
clearBoard();

newPiece();
timer.start();
}

private void pause()
{
if (!isStarted)
return;

isPaused = !isPaused;
if (isPaused) {
timer.stop();
statusbar.setText("paused");
} else {
timer.start();
statusbar.setText(String.valueOf("score "+numLinesRemoved));
}
repaint();
}

public void paint(Graphics g)
{
super.paint(g);

Dimension size = getSize();
int boardTop = (int) size.getHeight() - BoardHeight * squareHeight();

for (int i = 0; i < BoardHeight; ++i) {
for (int j = 0; j < BoardWidth; ++j) {
Tetrominoes shape = shapeAt(j, BoardHeight - i - 1);
if (shape != Tetrominoes.NoShape)
drawSquare(g, 0 + j * squareWidth(),
boardTop + i * squareHeight(), shape);
}
}

if (curPiece.getShape() != Tetrominoes.NoShape) {
for (int i = 0; i < 4; ++i) {
int x = curX + curPiece.x(i);
int y = curY - curPiece.y(i);

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