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ID Category Severity Reproducibility Date Submitted Last Update
0000853 [Squeak] Morphic minor always 01-30-05 21:50 08-21-07 09:13
Reporter wiz View Status public  
Assigned To
Priority normal Resolution open  
Status new   Product Version 3.9
Summary 0000853: (Halo) When rotating the center of rotation handle wobbles drunkenly.
Description Get a round rectangle. Use its halo to rotate it while the rotation center is displayed. The rectangle rotation proceeds normally but the halos center handle does not stay in the same place. You might have to make the rectangle transparent (3.9 won't always show the right z-order for the center.)
Additional Information The center handle should stay over the center of rotation reference point.

It doesn't because it is a submorph of halo. Halos bounds and therefore position changes when its targets bounds change. Rotating the morph changes the bounds of the rendering morph.

The centers position is figured as an offset from halos position ( bounds topLeft) so it is adjusted by privateFullMoveBy: delta. And then adjusted back by something else later. On the screen it wobbles drunkenly.

Proposed solutions.
1) the rendering morph instead of recalculating bounds for each rotation could just initially allocate a form large enough for the most excentric rotation and use that for all rotations. Then it wouldn't change size and the
halo morph would not change size and the halo morph referernce center would stay put. It might even run faster for not having to always reallocte the rotated forms.

2) define a reference point morph class that handles positon updates by not moving and put the reference center handle on top of that morph.
Only when the center is deliberatly moved (shift drag) would the positon of the reference point morph change.

I personalbly believe implementing both solutions would be worthwhile.
Polygons wouldn't work with solution (1). Their bound are always changing.




see also 0000803
Attached Files

- Relationships
child of 0006564new  [RFE] Halos need to be refactored to be more along the lines of Menus 

There are no notes attached to this issue.

- Issue History
Date Modified Username Field Change
01-30-05 21:50 wiz New Issue
08-21-07 09:13 wiz Relationship added child of 0006564


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