GalaxSee Test Drive
GalaxSee is designed to perform several standard viewing,
opening, closing, and saving functions as well as interact in a variety
of ways with other applications running on a PC. These behaviors include
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Creating, iterating, viewing, saving, and opening galaxies,
This document contains a task list that will explore the main functionalities
of the program.
The tasks described below are summarized in this list:
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Installing GalaxSee
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Setting initial conditions of a galaxy
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Creating a new galaxy from within GalaxSee
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Iterating a galaxy
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Rotating a galaxy
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Saving a galaxy
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Closing a galaxy; opening a saved galaxy
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Viewing the list of stars; changing the color of an individual star
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Changing the location of an individual star
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Viewing GalaxSee's help files
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Changing the integration method
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Creating a galaxy with a text editor and opening it from GalaxSee.
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Copy the GalaxSee folder to the hard drive of a PC. Double-click on the
GalaxSee icon to start the program
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Choose Galaxy Setup... from the Galaxy menu. Set the parameters
to something like the following:
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Create a galaxy by selecting New Galaxy from the Galaxy menu.
You should see a window open with a bunch of dots in a distribution corresponding
to that selected in the Galaxy Setup... dialog box, something like
this:
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Iterate the galaxy by selecting Run from the Galaxy menu.
If rotation factor was set to 1 in the galaxy setup box when you
created the galaxy, you will see motion immediately. If the rotation
factor was zero, it may take a few steps before the motion of the stars
is apparent.
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Stop the galaxy from running by selecting Stop from the Galaxy
menu. Click on the galaxy and drag the mouse around. You should see the
galaxy rotating in response to your movements. If the mouse is still moving
when you let the button up, the galaxy should keep spinning until the next
mouse click.
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Save the current galaxy by selecting Save Galaxy from the Galaxy
menu. You can save the galaxy in the same folder as the GalaxSee
application or browse and save it in another location.
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Close the current galaxy by clicking the close box, then open the copy
of it (which you just saved) by selecting Open Galaxy from the Galaxy
menu. The galaxy should be the exact, same galaxy as the one you just saved.
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Select Show List from the List Options submenu of the Galaxy
menu. A window should appear with a list of data about all of the stars
in the galaxy. Double-click on one row of the list to bring up a dialog
box with information about that particular star in it. Change the color
of the star to something other than the current color using the color
popup menu. Click OK to confirm this choice. One of the stars in
the galaxy window should change color in accordance with your choice (you
may have to rotate the galaxy around to find it).
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Bring the Star List window to the front, and double click on the
same row that you clicked above. This time, alter the x, y, and z coordinates
of the star to, say, 2.5, 2.5, and 2.5. Click OK to confirm this.
When the galaxy is redrawn, the star you selected should appear on one
corner of the box.
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Set the scale to "Earth-Sun" with the Scale option under the Galaxy
menu. Open the galaxy earth_sun.gxy. Go
the the Model Settings dialog box (select Model Settings...
from the Galaxy menu) and set the integration method to "Euler".
Click
OK and run the "galaxy". After a few rotations, it should
be obvious that the earth is moving away from the sun. Now set the integration
method to "Improved Euler". Re-open the Earth-Sun system and run it again.
Run the system, and the earth should stay in a circular orbit indefinitely.
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Finally, use a simple text editor or spreadsheet program to create and
save a galaxy and open that galaxy by selecting Open Galaxy from
the GalaxSee menu.
A simple example of this would be to create a SimpleText document that
consists of the following lines:
//Galaxsee Version 2.0
Scale: Galactic
2
100 1 1 1 0 0 0 3
200 2 -1 1 0 0 0 6
Save the document as "test.gal" and then open it from GalaxSee.
You should see a galaxy with two stars in it, one blue and one cyan. (For
more details on this functionality, see Creating
a Galaxy Text File).
Go to the Help Index.
Developed by
The
Shodor Education Foundation, Inc.
© Copyright 1996