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Joe 2009-11-23 21:31:10 PST

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If type is ::SDL_HAPTIC_CARTESIAN, direction is encoded by three positions
367     *  (X axis, Y axis and Z axis (with 3 axes)).  ::SDL_HAPTIC_CARTESIAN
uses
368     *  the first three \c dir parameters.  The cardinal directions would
be:
369     *   - North:  0,-1, 0
370     *   - East:  -1, 0, 0
371     *   - South:  0, 1, 0
372     *   - West:   1, 0, 0

typedef struct SDL_HapticDirection
{
    Uint8 type;         /**< The type of encoding. */
    Uint16 dir[3];      /**< The encoded direction. */
} SDL_HapticDirection;

An unsigned int can't store negative values and I don't see an alternate way to
encode them in the docs or source. The best I have been able to come up with is
using a negative magnitude for the effect but this will only get me 2 of the 4
quadrants in the plane for 2d effects. I looked at the win32 and linux
implementations and I believe is is safe to use signed ints in the direction
struct. I am unfamiliar with the darwin haptics API so I don't know if it is
safe.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%404237
This commit is contained in:
Sam Lantinga 2009-11-27 19:29:27 +00:00
parent 015d99c5d9
commit 215689096f
1 changed files with 1 additions and 1 deletions
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2
include/SDL_haptic.h
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@ -411,7 +411,7 @@ typedef struct _SDL_Haptic SDL_Haptic;
typedef struct SDL_HapticDirection
{
Uint8 type; /**< The type of encoding. */
Uint16 dir[3]; /**< The encoded direction. */
Sint32 dir[3]; /**< The encoded direction. */
} SDL_HapticDirection;