Re: A question about location of points on a circle

*To*: mathgroup at smc.vnet.net*Subject*: [mg106934] Re: A question about location of points on a circle*From*: Szabolcs Horvát <szhorvat at gmail.com>*Date*: Fri, 29 Jan 2010 07:44:09 -0500 (EST)*References*: <hjrf7s$n06$1@smc.vnet.net>

On 2010.01.28. 8:43, Marwa Abd El-Wahaab wrote: > Dear Sir, > > I am a Mathematica 7 user. > > I have a question : > > How can I locate points on the circumference of a circle by using > "Graphics"? > > I use in drawing the circle: > > Graphics[Circle[{0,0},r]] > I'm not sure I understand what you are asking for. Is this it? DynamicModule[{pt = {1, 0}}, Graphics[{Circle[], Locator[Dynamic[pt, (pt = Normalize[#]) &]]}, PlotRange -> 2]] This is copied directly from http://reference.wolfram.com/mathematica/ref/Locator.html#ES_4 under "Applications".