[Pharo-project] Help with Rotating a Box

Nicolas Cellier nicolas.cellier.aka.nice at gmail.com
Fri Sep 25 19:27:05 EDT 2009


http://bugs.squeak.org/view.php?id=6511

2009/9/25 Andrew P. Black <black at cs.pdx.edu>:
> I've been playing with a Morphic implementation of "Joe the box" for an
> intro programming course.  It shouldn't be hard, right?
>
> The problem is rotation.  It's easy to rotate a polygon morph, but I can't
> get a TextMorph (for the name) to rotate and stay centered.  My next attempt
> (attached), was to use a transformation morph.  This almost works, except
> that when rotating from a non-manhattan orientation, smurfs get left on the
> display.
>
> The code is attached.
>
>
>
>
>
>
> I try doing this in a workspace:
>
> joe := NamedBoxMorph2 new.
> joe name: 'Fred'.
> joe openInWorld.
> joe color: Color lightBlue.
> joe turn: -45.
> joe turn: 45.
>
> Do the
>
>        joe turn: +/- 45
>
> a few times.  Bits of the rectangle are left on the display.  Is this a bug
> in morphic, or a bug in my code (more likely)?  Is tehre an easy fix/
>
> The critical method from the filein is this one, I think:
>
> BoxMorph2 >> initialize
>        "initialize this BoxMorph so that it looks like a Box in BoxWorld"
>        | rectangle b |
>        super initialize.
>        smoothing := 3.
>        b := Rectangle origin: 85 @ 200 extent: 80 @ 80.
>        rectangle := RectangleMorph new.
>        rectangle bounds: b.
>        rectangle color: Color transparent.
>        rectangle borderWidth: 1.
>        self addMorphCentered: rectangle.
>        self bounds: b.
>
> I tired making the bounds of the boxMorph a pixel or two bigger (in the last
> line): this didn't help.
>
> Any ideas?
>
>        Andrew
>
>
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