Incremental changes

Yesterday was spent mostly as anticipated – picking up my shiny new/used monitor (quite happy with that purchase) trying out the new Enumeration class (minor success, needs a couple small changes before further testing), tying up some loose ends in Drawing, etc.

From a user’s perspective, the main change to Drawing is that isometric views are now constrained so they’ll only move in 45 degree angles from the Front view, much like the normal orthographic views move only vertically or horizontally from the Front view. I’m not 100% happy with the implementation here, so may do a bit more work on that later – the movement can get a bit jittery when isometric views are moved too near the centre of the Front view, although there’s not much good reason to do that anyway.

But! I also tracked down the source of a bug that’s closely related to the one discussed previously in Bounding Bounding Boxes. Isometric views were sometimes being positioned a little strangely, which became more of an issue after their positions were constrained. The problem is that the centroid of an object’s bounding box is dependant on the orientation of the bounding box. The isometric views end up wanting a bounding box for the object that’s not aligned with the originally calculated one, so they sometimes are not centred on the origin. A fix for that is first up on my list for today, though I’m a bit slow with this Open CASCADE 3D geometry stuff.

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