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<H3> 5.2.5 Locomotion (Moving Around) </H3>
<!--docid::SEC176::-->
<P>
Staring at that solid wall gets a bit boring after some time. The problem is
that we can't move the camera to change our view point. Let's add some code
to do exactly this. Edit `<TT>simple.cpp</TT>' again and change
`<TT>SetupFrame()</TT>' as follows:
</P><P>
<TABLE><tr><td> </td><td class=example><pre>void Simple::SetupFrame ()
{
// First get elapsed time from the virtual clock.
csTicks elapsed_time = vc->GetElapsedTicks ();
// Now rotate the camera according to keyboard state
float speed = (elapsed_time / 1000.0) * (0.03 * 20);
iCamera* c = view->GetCamera();
if (kbd->GetKeyState (CSKEY_RIGHT))
c->GetTransform ().RotateThis (CS_VEC_ROT_RIGHT, speed);
if (kbd->GetKeyState (CSKEY_LEFT))
c->GetTransform ().RotateThis (CS_VEC_ROT_LEFT, speed);
if (kbd->GetKeyState (CSKEY_PGUP))
c->GetTransform ().RotateThis (CS_VEC_TILT_UP, speed);
if (kbd->GetKeyState (CSKEY_PGDN))
c->GetTransform ().RotateThis (CS_VEC_TILT_DOWN, speed);
if (kbd->GetKeyState (CSKEY_UP))
c->Move (CS_VEC_FORWARD * 4 * speed);
if (kbd->GetKeyState (CSKEY_DOWN))
c->Move (CS_VEC_BACKWARD * 4 * speed);
<small>...</small>
}
</pre></td></tr></table></P><P>
That's all! With this simple change you can rotate the camera with the left
and right arrow keys and move forward and backward with the up and down arrow
keys. Try it out to see the effect. To rotate the camera we use
<CODE>RotateThis()</CODE> which expects a vector to rotate along and an angle given in
radians (the speed parameter). There are a number of predefined vectors which
you can use. A couple of them are used in this example.
</P><P>
That's it for now. In this tutorial you learned how to setup the Crystal
Space system for use, how to create a simple room with some lights, event
handling, and how to handle some basic camera operations.
</P><P>
You can now go on to the next tutorial (see section <A HREF="cs_79.html#SEC177">5.3 Simple Tutorial 2: Sprites</A>)) to learn
how to add a 3D sprite to this application.
</P><P>
<A NAME="Tutorial Simple 2"></A>
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