https://bugs.kde.org/show_bug.cgi?id=446020
--- Comment #5 from Robert Hairgrove <c...@roberthairgrove.com> --- (In reply to Oliver Kellogg from comment #4) > (...) - In function resizeSceneToItems, as an experimental change comment out > call to setSceneRect(itemsBoundingRect()). > It appears that the function resizeSceneToItems may be removed > altogether (subject to further tests). Thanks for looking into this, Oliver. In the meantime, I saw that QGraphicsScene will use itemsBoundingRect() anyway if no scene rect was previously set (in Qt docs). However, the strange drawing behavior of the diagrams when only a few objects/widgets are shown, and by extension of the bird's view, seems to stem from the fact that the scene has no minimum rect with sensible defaults for width and height. If I add two dummy widgets, one in the upper left corner and the other in the lower right corner, and keep moving them farther apart by scaling the view size down, then I can draw and resize other objects normally which lie inside of the bounding rect determined by the two dummy widgets. Also, the bird's eye view then works as one would expect. Dragging one object in one direction and having others move in the opposite direction is an optical illusion created by the fact that QGraphicssScene will try to keep all objects contained by it centered. Looking at the Qt example code in the "diagramscene" example, the scene's area is set in the constructor of MainWindow to (0,0,5000,5000) and it never changes. I don't know if this would work for Umbrello (when calling saveTo/loadFromXMI(), for example), but we could try starting out with a default size of 800 x 1100 pixels (which would correspond roughly to a single A4 page in portrait orientation with 96 DPI) and call resizeSceneToItems() only if the scene needs to grow its size or if the user selects "Fit" from the scale control. Perhaps this could be user-configurable? I recall reading somewhere that it is considered best practice only to include as much detail in a single UML diagram as will fit on a single A4 or US Letter size page... but cannot remember where I saw this. -- You are receiving this mail because: You are watching all bug changes.