The Interactive Geometry Software Cinderella

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Forums->Cinderella Support (E)->Cinderella manual: questions/comments

verbist
1 stars
Cinderella manual: questions/comments


Mr Kortenkamp, I ordered and obtained a few weeks ago the excellently written manual for Cinderella.2. I learned a lot about C.2, things I did not even think about before. I particularly experimented with “loci” , and the graphical representations you can obtain with it, I especially appreciate the graphical representations you can obtain if you use as “tracer” a curve e.g. a circle , or another 2nd degree curve.
I do however not find out how you can construct a cycloid (rolling a circle on/in another circle) as suggested on the figure of page 104 of the manual.
Also the chapter on transformations was very interesting. I just regret the absence of the general tranformation X = K² * x/(x² + y²) and Y = K² * y/(x² + y²) or R = K²/r. This tranformation is interesting as it transforms a circle into a cirkel (or into a straight line if the pole is on the original circle). You know of course that this transformation conserves the values of the angles between curves. Do you think that this transformation might be included in a next release or version of Cinderella? Or can you give any suggestions in how to program and include it myself?
I generally use the output in .pdf format for pictures, often to use it in photoshop for further image handling. I tried also the export in .jpg but I obtain rhen an greenish image with a brownish background, which is almost unreadable as such. Do I do anything wrong, or can you define other parameters for the outputcolors? What are the resolution figures in .pdf – is there any loss between the .cdy picture on the screen -, and in .jpg? Can the user change these resolutions?


 
on: Mon 11 of Jun, 2012 [14:26 UTC] reads: 91290

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author message
cameyo
3 stars
Re: Cinderella manual: questions/comments
on: Thu 14 of Jun, 2012 [15:58 UTC]
a cycloid in the attached file...
The cdy contain the script to review construction too.

Have a nice day.

cameyo

attachment cicloide_u.cdy (6.44 Kb)

author message
cameyo
3 stars
Re: Cinderella manual: questions/comments
on: Wed 13 of Jun, 2012 [07:30 UTC]
Hi verbist,
the transformation is "circle inversion" and you can do it with a macro (i have tried and it works) or with cindyscript.
For output i use to grab the screen (mac and win) because the cinderella output of jpg, png and pdf have some drawbacks.
For the cycloid...i'll try this afternoon smile

Have a nice day.

cameyo




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