private void OnStartScale(ToolCoord pivotCoord, ToolCoord pickedCoord, Vector2 mousePos, bool rippleTime)
{
Bounds bounds = selectionBounds;
m_IsDragging = true;
m_Pivot = ToolCoordToPosition(pivotCoord, bounds);
m_Previous = ToolCoordToPosition(pickedCoord, bounds);
m_MouseOffset = mousePos - m_Previous;
m_RippleTime = rippleTime;
m_RippleTimeStart = bounds.min.x;
m_RippleTimeEnd = bounds.max.x;
m_State.StartLiveEdit();
}