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TDx_Input_Library v2.00 Component Reference
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[ TDx_Input_Library::TDIPeriodic ] [ next: TDIPropDWORD ] [ prev: TDIObjectDataFormat ] class TDIPeriodic : public TComponent
class PACKAGE TDIPeriodic : public TComponent
class type : Wrapper
TDIPERIODIC
[ component ]
The TDIPeriodic component wraps the DirectX DIPERIODIC structure which contains type specific information for force feedback effects that have the DIEFT_PERIODIC option set. This component is referenced by TDIEffect::TypeSpecificParams when it is being used to define a periodic effect. Periodic effects are waveforms that are usually used to achieve a shaking in the control device. You can apply an envelope to a periodic effect. To create a standard periodic effect pass one of the GUIDs below in the TDx_InputDevice::CreateEffect() Guid parameter. The standard waveform GUIDs are: GUID_Square - Feedback oscillates directly from maximum negative to maximum positive force. GUID_Sine - Feedback oscillates using a sine waveform pattern of smooth curves. GUID_Triangle - Feedback oscillates from positive to negative at a constant rate of force change. GUID_SawtoothUp - Feedback increases at a fixed rate then drops directly to the maximum negative magnitude and begins increasing again. GUID_SawtoothDown - Feedback decreases at a fixed rate then rises directly to the maximum positive magnitude and begins decreasing again. Magnitude is defined here, while the duration is defined by TDIEffect::Duration. A periodic force using an envelope will start its cycle at the attack level, relative to its phase, spend a specified duration moving towards the sustain level, stay at the sustain level for a specified period, then spend another period of time moving towards the fade level. If you would like to submit additions or improvements to this page, click: darren_john_dwyer@hotmail.com. |
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