A structure containing a template for a Ramp effect.
Defined in SDL_haptic.h
typedef struct SDL_HapticRamp
{
/* Header */
Uint16 type; /**< SDL_HAPTIC_RAMP */
SDL_HapticDirection direction; /**< Direction of the effect. */
/* Replay */
Uint32 length; /**< Duration of the effect. */
Uint16 delay; /**< Delay before starting the effect. */
/* Trigger */
Uint16 button; /**< Button that triggers the effect. */
Uint16 interval; /**< How soon it can be triggered again after button. */
/* Ramp */
Sint16 start; /**< Beginning strength level. */
Sint16 end; /**< Ending strength level. */
/* Envelope */
Uint16 attack_length; /**< Duration of the attack. */
Uint16 attack_level; /**< Level at the start of the attack. */
Uint16 fade_length; /**< Duration of the fade. */
Uint16 fade_level; /**< Level at the end of the fade. */
} SDL_HapticRamp;This struct is exclusively for the SDL_HAPTIC_RAMP effect.
The ramp effect starts at start strength and ends at end strength. It augments in linear fashion. If you use attack and fade with a ramp the effects get added to the ramp effect making the effect become quadratic instead of linear.