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Mirroring of Design...
 

Mirroring of Design - Does the Table's software automatically do that?  

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(@crsolomon)
Contributor
Joined: 1 year ago
Posts: 13
May 15, 2019 7:26 pm  

I am working on a small program to allow users to type in lines of text and produce a .thr file of their message - for Birthdays, Greetings and the like.  I've digitized a cursive alphabet and started printing messages on the table.

My Question is this - why does the table mirror output on the X axis (doing a Cartesian translation of the polar .thr file)? The letters are reversed.  I've only noticed this since most of my previous submissions were symmetric objects and the mirroring was not apparent.  I just mirror the Cartesian file on the X axis and it looks "normal".  But is this just how the table software works?


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(@dithermaster)
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Joined: 1 year ago
Posts: 42
May 16, 2019 8:12 am  

It's probably just interpreting theta reverse to what you thought, which I think would also mirror the X axis. 


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(@crsolomon)
Contributor
Joined: 1 year ago
Posts: 13
May 16, 2019 11:01 am  

That may be the answer - the more that I work on programming the table the more "quirks" I recognize in the software.  Most people develop geometric based files where mirroring doesn't matter - but trying to create images are quite a different matter.  I have written software that takes an x,y based image and converts it into the dialect of polar that the table speaks and just realized there was a reversal.

just my notes of the tables polar preferences vs the Cartesian equivalent

1) quadrants are different - for the normal 1,2,3,4 in Cartesian , the table "sees" 2,3,4,1 for the image  - just a Pi/2 rotation fixes that.

2) The table is exquisitely sensitive to the value of Pi when you cross the 0 angle line clockwise or counterclockwise , otherwise it "jumps" in movement

3) The 0,0 area is problematic area for drawing - best to avoid or use tiny tiny increments when near it.

4) there is an x axis reversal of a Cartesian image by the table (when you translate the .thr file back to Cartesian you see an x axis  reversed image actually drawn on the table) 

5) When working from a Cartesian point base, the equivalent rho point must always be checked so it never exceeds 1

Anyway - I made an image and ran 4 cases - no flip, x axis flip, y axis flip and both axis flip.       X gets mirrored and Y is the same as the Cartesian equivalent.  One more thing to add to the software to compensate. 

 

 


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