RN02 Eye Chart (NEBULA)

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Outline

Nebula Visualization is a widgets library for data visualization in science, engineering and SCADA areas. An eye diagram is an oscilloscope display in which a digital signal is repeatedly sampled by a receiver and applied to the vertical input while the data rate is used to trigger the horizontal sweep.

Platforms:	32/64bit 32/64bit 32/64bit
Requirements:	None
Known limitations:	None
Status:	Stable
Extensibility:	JavaScript
Supported signal types:	Numerical signal (Float, Integer,..) Manual fill
Chart Parameters:	Title: No Title, Description, Plot Name, Plot Description. Options: Annotated, Show Legend, Show Title, Show Grid. Max Points: Limits the maximum number of points to be displayed. Nebula Script: Extend the chart with Java Script. Apply Script: Enables/Disables the Nebula scripting. Manual Fill: Disables the provider's default signal processing; instead, the script must provide the display data.
Plot Parameters:	Rate : Define the rate at which the eye chart is triggered (e.g. ' 10ms'). Offset : Define an offset at which the eye chart starts (e.g. '1ms'). Cycles : Cycles", "Define the (max) number of cycles.

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Compatible signal data

The Eye chart provider supports simple numerical signals.

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Chart Configuration

You can modify the chart behavior under Preferences->impulse->Charts.

• You may add own charts or chart variants
• Modify existing charts (Chart Parameters)

• Title: No Title, Description, Plot Name, Plot Description.
• Options: Annotated, Show Legend, Show Title, Show Grid.
• Max Points: Limits the maximum number of points to be displayed.
• Nebula Script: Extend the chart with Java Script.
• Apply Script: Enables/Disables the Nebula scripting.
• Manual Fill: Disables the provider's default signal processing; instead, the script must provide the display data.

You can extend the Eye chart using scripts. To achieve this you have access to the nebula graph object.

  
	// graph: XYGraph figure ( https://eclipse.org/nebula/widgets/visualization/visualization.php)
	// x,y,width,height: geometry
	// color, background: Colors
	// readable: input of IReadableSamples
	
	// simple modifications
	graph.primaryXAxis.setAutoScale(false);
	graph.primaryXAxis.setTitle("my x");
	graph.primaryYAxis.setAutoScale(false);
	graph.primaryYAxis.setTitle("my y");
	graph.primaryYAxis.setDashGridLine(true);
	graph.primaryYAxis.setShowMajorGrid(true);

If you check both "Apply script" and "Manual Fill", the script shall load the sample data into the chart (the standard data handling is disabled):

Beside the chart parameters, you can set the default plot parameters. You can override them in the actual plot.

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Plot Configuration

To display a chart in a given plot:

• Configure production/source to gain a compatible signal
• Set the plot type to "Chart",
• Configure the charts plot parameter ("Chart Style").

You can override the following plot parameters:

• Rate : Define the rate at which the eye chart is triggered (e.g. ' 10ms').
• Offset : Define an offset at which the eye chart starts (e.g. '1ms').
• Cycles : Cycles", "Define the (max) number of cycles.

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