type TTraceItem = class(TPersistent);
Stores the history of the associated Mark.
Stores the history of individual fields of associated TMarkRecord. The Mark to trace is specified with the MarkIndex property.
Properties
| Name | Type | Description |
|---|---|---|
| MarkIndex | Integer | Defines the index in the MarkList, to identify the mark whose history is to be stored. |
| SpectralDt | Double | Time in seconds between consecutive spectrums. |
| SpectralSamplingFrequency | Double | Sampling frequency with which the spectrums are being sampled. When setting this property Dt is automatically updated. |
| SpectralSamplingTime | Double | Total length in seconds between the first and the last spectrum. |
| SpectralTimeOffset | Double | Time in seconds at which the spectrogram starts. |