Stardraw can appear to lock-up when you use the Snap to Intersection modifier in drawings containing a large number of objects. Is Snap to Intersection on, and does unchecking it resolve the problem?
Stardraw in fact is not locking up, but it's working hard and if you take your hands of the mouse and keyboard it will complete the operations it's working on. To explain: when you're moving, editing or drawing an object, the Snap to Intersection modifier, if active, calculates the possible intersection of every object in the drawing with every other object every time you move the mouse. The number of calculations is a factorial function so in a small drawing this causes no problems, but in a drawing with a lot of objects – for instance when you have multiple high-detail symbols – it can take your computer a long time to calculate the results, and every time you move the mouse Stardraw AV has to re-start the calculation.
Snap to Intersection should only be used if you really need to identify intersections between lines that cannot be snapped to using another modifier, e.g. Snap to Grid or Snap to Object. Thus only turn Snap to Intersection on if you need to snap to a) a point where 2 lines cross that b) isn't on the grid (or a grid sub-division determined by your grid settings) and c) isn't the endpoint or midpoint of a line. In most structured drawings the points that you draw to are on the grid or are endpoints of existing lines, so you rarely, if ever, need to use Snap to Intersection when working with drawings containing symbols.
Instead of using Snap to Intersection, use Snap to Grid or Snap to Object and all will be well.
Kind regards,
Rob Robinson
Stardraw.com