R: [Plib-users] navigation using mouse

[Paolo L. <p.l...@ci...>]

Andreia R. Assuncao Schneider wrote:
>
> I'm trying to do a program that uses the mouse for navigation. I'm using
> GlUT to build the frame.
> Has anyone done it already?

Andreia,

please find attached the file with the excerpt of the code I use for the
mouse navigation model in my Plib-based viewer.
The three mouse buttons are mapped to camera motion in the following way:

- Left: walk navigation on the x-y plane - click set the init, moving the
mouse while keeping left-button pressed give proportional delta for
direction and speed;

- Middle: look around - click set the init, moving the mouse while keeping
middle-button pressed give proportional delta for yaw and pitch angles -
they remains for further walk navigation;

- Right: move on the vertical plane perpendicular to the walk direction -
click set the init, moving the mouse while keeping right-button pressed give
proportional delta for vertical and lateral movements.

These seems to me quite natural as camera manipulations in a walk approach -
not suitable for examining an object though. Some simplification from the
original code could need to adapt the constant used as mapping factor
between pixels and world space.

The code should even compile (not tried), yet please feel free to ask
anything about it.

Greetings -

Paolo


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Paolo Leoncini						phone:  +39 (0823) 623134
Visualization & Virtual Reality			fax:    +39 (0823) 623126
CIRA - Italian Center for Aerospace Researches	mailto:p.l...@ci...
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