scale_index_(4), // 20 per div
scale_index_drag_offset_(0),
div_height_(3 * QFontMetrics(QApplication::font()).height()),
vdivs_(1),
resolution_(0)
{
scale_index_(4), // 20 per div
scale_index_drag_offset_(0),
div_height_(3 * QFontMetrics(QApplication::font()).height()),
vdivs_(1),
resolution_(0)
{