protected void drawBackground(QPainter painter, QRectF exposed) { // Draws all tiles that intersect the exposed area. for (int y = 0; y < numTilesV; ++y) { for (int x = 0; x < numTilesH; ++x) { QRectF rect = rectForTile(x, y); if (exposed.intersects(rect)) painter.drawPixmap(rect.topLeft(), tiles[y][x]); } } }