def step1(self):
self.text = """\
<h3><center>Command Lists</center></h3>
<p>Demos the use of command lists to perform complicated oribtal manouvers.</p>
<p>Available commands are (one per line):</p>
<ul>
<li>wait(t) - waits for <em>t<em> seconds</li>
<li>at(t) - waits until time <em>t<em></li>
<li>prograde() - returns <em>prograde<em> unit vector</li>
<li>retrograde() - returns <em>retrograde<em> unit vector</li>
<li>normal() - returns <em>orbit-normal<em> unit vector</li>
<li>antinormal() - returns <em>orbit-antinormal<em> unit vector</li>
<li>dv(dv) - applies <em>dv<em> change of velocity</li>
</ul>
<p>An example command list:</p>
<pre>
wait(10) # wait 10 seconds
dv(prograde() * 100) # prograde burn, 100 m/s
at(100) # wait until time=100 seconds
dv(prograde() * 200) # prograde burn, 200 m/s
</pre>
"""
self.sim.__init__(0)
self.sim.bodies = [Body.generate_circular_equatorial_orbit(1.0E7),
Body.generate_circular_equatorial_orbit(1.0E6, (0.0, 1.0, 1.0, 1.0))]
self.sim.bodies[0].pos_viz_mode = Body.POSITION_VISUALISATIONS['rv']
self.sim.bodies[1].pos_viz_mode = Body.POSITION_VISUALISATIONS['rv']
self.reset_sim()
self.viz_window.switch_view_north(12.0)
def step1(self):
self.text = """\
<h3><center>Hohman Transfers</center></h3>
<p>Hohman transfer orbits are used to transfer between two circular orbits in the same plane.</p>
<p>Let's start with a circular orbit at altitude of 1,000 km above Earth, and a target orbit that is also circular
at an altitude of 10,000 km. Both orbits are equatorial.</p>
"""
self.sim.__init__(0)
self.sim.bodies = [Body.generate_circular_equatorial_orbit(1.0E6, (0.0, 1.0, 1.0, 1.0)),
Body.generate_circular_equatorial_orbit(1.0E7)]
self.reset_sim()
self.viz_window.switch_view_north(12.0)
def __init__(self, num_random_objs):
self.bodies = []
self.selected_body = None
if num_random_objs > 0:
self.selected_body = 0
self.bodies.append(Body.generate_circular_equatorial_orbit(6.0E5, (0.0, 1.0, 1.0, 1.0)))
self.bodies.append(Body.generate_circular_equatorial_orbit(1.2E6))
for x in xrange(num_random_objs - 2):
self.bodies.append(Body.generate_random_orbit())
self.pos_viz_mode = Body.POSITION_VISUALISATIONS['symbol']
self.orbit_viz_mode = Body.ORBIT_VISUALISATIONS['all']
self.set_defaults()
