Trying to make a Hypotrochoid

I did a similar search and found someone's definition, but it is way too complex for want I want to do and it doesn't teach me anything. I just want to do something simple.

Here is what I want to do

http://mathworld.wolfram.com/Hypotrochoid.html

Sounds easy right? Instead of the starfish shape I get this triangle thing. And the triangle is not even symetrical!

Can someone take a look at my definition and let me know what I'm doing wrong? All I did was plug the equations in and then put a curve through it.

Attachments:

hypotrochoid.gh, 5 KB
hiuhihuih.PNG, 47 KB

Replies to This Discussion

Permalink Reply by Hyungsoo Kim on January 14, 2017 at 1:16am

Hi. Check attached.

Attachments:

Hypotrochoid_reV1.gh, 9 KB

Permalink Reply by peter fotiadis on January 14, 2017 at 2:12am

And given the opportunity ... er ... hmm... check this just for fun as well (only for freaks IF the enableFreakyZ is true).

Note: If any predefined combo is picked, values are fixed (but scaleX/Y works).

Note: Set autoZoom always true.

Attachments:

Curves_Hypo_V1.gh, 126 KB

Permalink Reply by mark zirinsky on January 14, 2017 at 11:26am

Nice one Peter. By the way, how did you implement the "auto zoom all" as the scale of the result gets larger. That would be useful to do in grasshopper.

Permalink Reply by peter fotiadis on January 15, 2017 at 1:09am

Use the 2nd C# in order to zoom at Geometry Base types.

BTW: After finding the "right" bounding box the zoom is using the Method as shown in the last line.

Attachments: