The Interactive Geometry Software Cinderella
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verbist
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Cinderella manual: questions/comments
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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?
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