0000853: (Halo) When rotating the center of rotation handle wobbles drunkenly.

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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

0006564

new

[RFE] Halos need to be refactored to be more along the lines of Menus

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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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