Strange size changes in Manipulate with GeometricTransformation

*To*: mathgroup at smc.vnet.net*Subject*: [mg92156] Strange size changes in Manipulate with GeometricTransformation*From*: Nazdrovje <nazdrovje at gmail.com>*Date*: Mon, 22 Sep 2008 05:24:39 -0400 (EDT)

Hi group, I was playing with Manipulate and GeometricTransformation and found a strange difference in behaviour when manipulating the orientation of a circle containing a line depending on how it was drawn. Below, I provide two ways of drawing this configuration. The first one behaves as expected, but moving the slider in the second example results in unexpected size changes. I suppose it must have something to do with bounding boxes of the building blocks, but I don't quite get it. I also feel the behaviour of the second one is actually wrong. What do you folks think? Cheers -- Nazdrovje This one rotates as expected: Manipulate[ Graphics[ GeometricTransformation[ { Circle[], Line[{{-1, 0}, {1, 0}}] }, RotationTransform[x =B0] ] ], {x, -180, 180} ] This one behaves erratical: Manipulate[ Graphics[ GeometricTransformation[ { EdgeForm[Black], FaceForm[], Disk[{0, 0}, 1, {\[Pi], 2 \[Pi]}], Disk[{0, 0}, 1, {0, \[Pi]}] }, RotationTransform[x =B0] ] ], {x, -180, 180} ]