You can pass a "radius" or "size" parameter to the point command, which will make them smaller or larger. Also, you can look at the line3d command (pass it a list of points to get a curved line).
On Nov 11, 2008, at 8:11 PM, acardh wrote: > I am drawing the line in this way: > > res=100 > theta1=38.7598 > phi1=-121.294 > theta2=40.3503 > phi2=-74.6594 > myline=[] > for i in range(1,100): > myline[i] = ((i/res)*theta1 + ((res-i)/res)*theta2, (i/res) > *phi1 + ((res-i)/res)*phi2) > mydots = [(cos(t*theta)*cos(t*phi), sin(t*theta)*cos(t*phi), sin > (t*phi)) for theta, phi in myline] > #plotting > world + sum([point3d(v, color='red') for v in city_coords]) + sum > ([point3d(v, color='green') for v in mydots]) > > Is there a way to draw the dots in 2D and not in 3D? I tried with just > "point" instead of "point3d" but it didn't work. I would prefer to > draw the line in 2D and keep the points for the cities in 3D. > > Thanks > > > On Nov 10, 3:44 pm, Robert Bradshaw <[EMAIL PROTECTED]> > wrote: >> On Nov 10, 2008, at 12:57 PM, acardh wrote: >> >>> One more question about this. How can I draw a line between any two >>> given points? >> >>> I am doing this >>> world = sphere((0,0,0), size=1, color='blue') >>> cities = [(38.7598, -121.294),(40.3503, -74.6594),(27.959, >>> -82.4821)] >>> t = RDF(pi/180) >>> city_coords = [(cos(t*theta)*cos(t*phi), sin(t*theta)*cos(t*phi), >>> sin(t*phi)) for theta, phi in cities] >>> world + sum([point3d(v, color='red') for v in city_coords]) >> >>> How can I draw a line between these cities? I am not sure if >>> there is >>> a direct function to do this. One way to do this might be drawing a >>> series of dots between any two cities using geocoordinates too. >>> Thanks >> >> There is a line command, but it draws a straight line (as if you were >> drilling a tunnel through the earth. The easiest would be your idea >> of making a set of dots. >> >> >> >>> On Nov 9, 8:53 pm, acardh <[EMAIL PROTECTED]> wrote: >>>> Thanks Robert, it's exactly what I needed. It was so easy for >>>> you, I >>>> guess. >> >>>> :o) >> >>>> On Nov 9, 12:28 am, Robert Bradshaw <[EMAIL PROTECTED]> >>>> wrote: >> >>>>> On Nov 8, 2008, at 7:52 PM, acardh wrote: >> >>>>>> Hi, >>>>>> Plotting an sphere is straightforward but I need help in how to >>>>>> draw >>>>>> points on the sphere. The sphere will represent the Earth and the >>>>>> points will be some geo-coordinates . >> >>>>>> Thanks!!! >> >>>>> This depends on how your points are given. I'm going to assume you >>>>> have latitude/longitude (in degrees), called phi and theta >>>>> respectively. Then one would draw the sphere via >> >>>>> sage: world = sphere((0,0,0), radius=1, color='blue') >> >>>>> Here I'm making 100 random cities. >>>>> sage: cities = [(ZZ.random_element(-180,180), ZZ.random_element >>>>> (-90,90)) for _ in range(100)] >> >>>>> Now I'll convert polar coordinates to regular xyz coordinates. >>>>> sage: t = RDF(pi/180) >>>>> sage: city_coords = [(cos(t*theta)*cos(t*phi), sin(t*theta)*cos >>>>> (t*phi), sin(t*phi)) for theta, phi in cities] >> >>>>> Now I'll plot them >>>>> sage: world + sum([point3d(v, color='red') for v in city_coords]) >> >>>>> I could have, of course, done something more interesting than >>>>> "points" >>>>> sage: world + sum([tetrahedron(size=.1, >>>>> color='yellow').translate(v) >>>>> for v in city_coords]) >> >>>>> - Robert > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
