data sampler

DataSampler

#example #data #drawing #control #graphics

Data recording and playback with visualization.

Module Name	data sampler test
Type	mtControl
Color	clInterfaceDesignModuleColor
Source	examples/DataSampler/

Description

Records incoming data values and plays them back in a loop with a visual waveform display. Demonstrates double-buffering, self-notification, and recording/playback toggle.

Parameters

#	Name	Type	I/O	Range	Callback
0	data	ptDataField	Input	0–1	None
1	toggle Rec	ptSwitch	Input	—	ctImmediate
2	clear Rec	ptButton	Input	—	ctImmediate
3	color	ptColor	Input	—	ctImmediate
4	out	ptDataField	Output (ReadOnly, DontSave)	—	None

How It Works

1. Recording: When toggled on, pushes incoming data to the current buffer each onProcess tick
2. Double-buffering: When a buffer nears capacity, swaps to a second buffer and triggers aggregation via sdkNotifyUsine(NOTIFY_TARGET_USER_MODULE, ...)
3. Playback: When recording stops, plays back the recorded data in a continuous loop
4. Visualization: Draws the recorded waveform as a path on the canvas

Key Concepts Demonstrated

• Double-buffering pattern for safe recording without blocking
• Self-notification: sdkNotifyUsine(NOTIFY_TARGET_USER_MODULE, ...) to send messages back to the module
• Recording/playback toggle with state management
• Path drawing for waveform visualization
• Settings panel with color picker

SDK Callbacks Used

onGetModuleInfo · onInitModule · onGetParamInfo · onCallBack · onProcess · onCreateSettings · onSettingsHasChanged · onPaint

Related Examples

• DataOscilloscope — Real-time scrolling waveform
• SimplePad — Another interactive control module

SDK Reference

• UserModuleBase Class
• UserModuleBase Drawing Methods