Animate a rotation of a Shape

Questions
1

I got help creating a rotation of a polygon about the origin, but was hoping someone could help me animate it so that the rotation happens on its own after students plot the correct image points on the graph. I am not sure exactly how to animate it (still more on a beginner level) or make the animation go when the target points are hit. Any help would be appreciated.

2

Here you go: [Copy of] Animation of Shape Rotation • Activity Builder by Desmos Classroom

I added in an animation function and a ticker that will make the t_0 variable increase when C = 1. The correctness check in the graph you had didn’t seem like it was functioning correctly so I just used the correctness from the table to sink correctness into the graph.

For checking the points, you were directly checking latex, which is ok, but it would break if a student varied their answer at all, like putting a space after the comma. I replaced the checks with examples of parseOrderedPair, which will make the checking a bit more robust.

2 Likes
3

Thank you! I will be sure to use parseOrderedPair from now on to check student points, now that I have a great example to follow. Thank you for the animation as well. It is working out great!

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4

I tried to follow the same animation set up that you showed me for rotations on my dilations, but something went wrong… I was hoping maybe you could take a look at slide 3. My issue is with my final polygon. Slide 2 has the original dilation without an animation graciously borrowed from Jay Chow. The CL is still a lot for me to wrap my mind around…

5

Ah, never mind. I just realized I forgot to add my P=[P1,P2,P3]. Though I am wondering if there is a way to get the dilation to size up from the original location of the figure. My dilation animation seems to be dilating from a different location.

6

I looked at your graph, and I think the issue is not that it’s from a different location, but that your animation is causing the scale factor to grow from 0. So if you change sd = sf * dilate to sd = 1 + (sf - 1) * dilate, that should make it animate like you want.

7

Yes, that did it! Thank you so much!