Now, we will construct the locus of the red circle with respect to P. First, select the point P and then the circle c (in that order). Click on the Locus menu. The "Construct" menu item will be active. Select "Construct". A set of images of the red circle will be displayed corresponding to uniformly distributed positions of the attached point P around circle c.
If we now moved circle c or other points in the Canvas the locus would update automatically. Also, to select the locus we just click on one of the copies of the red circle. A locus is visually identified as selected when all copies of the locus object appear selected, as shown below.
Once the locus is selected the "edit" menu item under the Locus menu will be active. If we select "Edit" a dialog box will pop-up permitting us to change the number of sample points that are used to position P around the circle. The default number of points is 25. Let's change this to 50. After doing so, we get the following image.