Programming Reference:VisualizationDemo Signal Processing - Revision history

Mellinger: /* See also */

2023-06-14T16:31:44Z

Mellinger: /* Process() method */

2019-02-08T15:32:57Z

Process() method

← Older revision		Revision as of 15:32, 8 February 2019
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	===<tt>Process()</tt> method===		===<tt>Process()</tt> method===
	When indicated by the decimation counter, the <tt>Process()</tt> function computes the squared correlation between the input signal's first two channels, and draws a pie shape according to the result. The image is rendered by calling <tt>GraphDisplay::Paint()</tt> on the offscreen buffer, and then its bitmap data are sent as a difference frame by calling <tt>~~GenericVisualization~~::SendDifferenceFrame()</tt> on the visualization object.		When indicated by the decimation counter, the <tt>Process()</tt> function computes the squared correlation between the input signal's first two channels, and draws a pie shape according to the result. The image is rendered by calling <tt>GraphDisplay::Paint()</tt> on the offscreen buffer, and then its bitmap data are sent as a difference frame by calling <tt>BitmapVisualization::SendDifferenceFrame()</tt> on the visualization object.
	Finally, the decimation counter is updated for the next call to <tt>Process()</tt>.		Finally, the decimation counter is updated for the next call to <tt>Process()</tt>.
	<syntaxhighlight lang="cpp">		<syntaxhighlight lang="cpp">

Mellinger: /* BCI2000 GraphDisplay vs. QPainter rendering */

2019-02-08T15:29:44Z

BCI2000 GraphDisplay vs. QPainter rendering

← Older revision		Revision as of 15:29, 8 February 2019
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	</syntaxhighlight>		</syntaxhighlight>

	==BCI2000 GraphDisplay vs. QPainter rendering==		===BCI2000 GraphDisplay vs. QPainter rendering===
	The code presented here is using the BCI2000 [[Programming Reference:GraphDisplay Class\|<tt>GraphDisplay</tt>]] class.		The code presented here is using the BCI2000 [[Programming Reference:GraphDisplay Class\|<tt>GraphDisplay</tt>]] class.

Mellinger: /* Implementation */

2019-02-08T15:27:49Z

Implementation

← Older revision		Revision as of 15:27, 8 February 2019
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	A ''BitmapVisualization'' object is used to send visualization window configuration, and bitmap data to the operator module. In the filter's <tt>Initialize()</tt> method, the bitmap visualization object's <tt>SendReferenceFrame()</tt> method is called to set an anchor for further visualization data. In the filter's <tt>Process()</tt> method, rendered visualization data is sent to the operator module using the bitmap visualization object's <tt>SendDifferenceFrame</tt> method as an update to existing image data.		A ''BitmapVisualization'' object is used to send visualization window configuration, and bitmap data to the operator module. In the filter's <tt>Initialize()</tt> method, the bitmap visualization object's <tt>SendReferenceFrame()</tt> method is called to set an anchor for further visualization data. In the filter's <tt>Process()</tt> method, rendered visualization data is sent to the operator module using the bitmap visualization object's <tt>SendDifferenceFrame</tt> method as an update to existing image data.

			===Declaration of internal variables===
	The code example uses a pointer to an internal private <tt>struct</tt> to hide implementation details from the outer header file of the filter class (PIMPL idiom).		The code example uses a pointer to an internal private <tt>struct</tt> to hide implementation details from the outer header file of the filter class (PIMPL idiom).

	~~===Declaration of internal variables===~~
	<syntaxhighlight lang="cpp">		<syntaxhighlight lang="cpp">
	struct VisualizationDemoFilter::Private		struct VisualizationDemoFilter::Private

Mellinger: /* Process() method */

2019-02-08T15:26:12Z

Process() method

← Older revision		Revision as of 15:26, 8 February 2019
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	===<tt>Process()</tt> method===		===<tt>Process()</tt> method===
	When indicated by the decimation counter, the <tt>Process()</tt> function computes the squared correlation between the input signal's first two channels, and draws a pie shape according to the result. The image is rendered by calling <tt>G</tt>		When indicated by the decimation counter, the <tt>Process()</tt> function computes the squared correlation between the input signal's first two channels, and draws a pie shape according to the result. The image is rendered by calling <tt>GraphDisplay::Paint()</tt> on the offscreen buffer, and then its bitmap data are sent as a difference frame by calling <tt>GenericVisualization::SendDifferenceFrame()</tt> on the visualization object.
			Finally, the decimation counter is updated for the next call to <tt>Process()</tt>.
	<syntaxhighlight lang="cpp">		<syntaxhighlight lang="cpp">
	void VisualizationDemoFilter::Process(		void VisualizationDemoFilter::Process(

Mellinger: /* Process() method */

2019-02-08T15:23:05Z

Process() method

← Older revision		Revision as of 15:23, 8 February 2019
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	===<tt>Process()</tt> method===		===<tt>Process()</tt> method===
			When indicated by the decimation counter, the <tt>Process()</tt> function computes the squared correlation between the input signal's first two channels, and draws a pie shape according to the result. The image is rendered by calling <tt>G</tt>
	<syntaxhighlight lang="cpp">		<syntaxhighlight lang="cpp">
	void VisualizationDemoFilter::Process(		void VisualizationDemoFilter::Process(

Mellinger: /* Process() method */

2019-02-08T15:19:17Z

Process() method

← Older revision		Revision as of 15:19, 8 February 2019
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	===<tt>Process()</tt> method===		===<tt>Process()</tt> method===
	<~~pre~~>		<syntaxhighlight lang="cpp">
	void VisualizationDemoFilter::Process(		void VisualizationDemoFilter::Process(
	const GenericSignal& Input,		const GenericSignal& Input,
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	++p->mDecimationCounter %= p->mDecimation;		++p->mDecimationCounter %= p->mDecimation;
	}		}
	</~~pre~~>		</syntaxhighlight>

	==BCI2000 GraphDisplay vs. QPainter rendering==		==BCI2000 GraphDisplay vs. QPainter rendering==

Mellinger: /* Initialize() method */

2019-02-08T15:18:47Z

Initialize() method

← Older revision		Revision as of 15:18, 8 February 2019
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	===<tt>Initialize()</tt> method===		===<tt>Initialize()</tt> method===
	<~~pre~~>		<syntaxhighlight lang="cpp">
	void VisualizationDemoFilter::Initialize(		void VisualizationDemoFilter::Initialize(
	const SignalProperties& Input,		const SignalProperties& Input,
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	p->mpValueField->SetVisible(true);		p->mpValueField->SetVisible(true);
	}		}
	</~~pre~~>		</syntaxhighlight>

	===<tt>Process()</tt> method===		===<tt>Process()</tt> method===

Mellinger: /* Declaration of internal variables */

2019-02-08T15:18:17Z

Declaration of internal variables

← Older revision		Revision as of 15:18, 8 February 2019
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	===Declaration of internal variables===		===Declaration of internal variables===
	<~~pre~~>		<syntaxhighlight lang="cpp">
	struct VisualizationDemoFilter::Private		struct VisualizationDemoFilter::Private
	{		{
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	TextField* mpValueField;		TextField* mpValueField;
	};		};
	</~~pre~~>		</syntaxhighlight>

	===<tt>Initialize()</tt> method===		===<tt>Initialize()</tt> method===
	<pre>		<pre>

Mellinger: /* Implementation */

2019-02-08T15:17:30Z

Implementation

← Older revision		Revision as of 15:17, 8 February 2019
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	==Implementation==		==Implementation==
	A ''BitmapVisualization'' object is used to send visualization window configuration, and bitmap data to the operator module. In the filter's <tt>Initialize()</tt> method, the bitmap visualization object's <tt>SendReferenceFrame()</tt> method is called to set an anchor for further visualization data. In the filter's <tt>Process()</tt> method, rendered visualization data is sent to the operator module using the bitmap visualization object's <tt>SendDifferenceFrame</tt> method as an update to existing image data.		A ''BitmapVisualization'' object is used to send visualization window configuration, and bitmap data to the operator module. In the filter's <tt>Initialize()</tt> method, the bitmap visualization object's <tt>SendReferenceFrame()</tt> method is called to set an anchor for further visualization data. In the filter's <tt>Process()</tt> method, rendered visualization data is sent to the operator module using the bitmap visualization object's <tt>SendDifferenceFrame</tt> method as an update to existing image data.

			The code example uses a pointer to an internal private <tt>struct</tt> to hide implementation details from the outer header file of the filter class (PIMPL idiom).

	===Declaration of internal variables===		===Declaration of internal variables===
	<pre>		<pre>

← Older revision		Revision as of 16:31, 14 June 2023
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	==See also==		==See also==
	[[Programming Reference:GraphDisplay Class]], [[Programming Reference:GenericVisualization Class]], [[Programming Reference:ComplexVisualizationDemo Signal Processing]]		[[Programming Reference:GraphDisplay Class]], [[Programming Reference:GenericVisualization Class]], [[Programming Reference:ComplexVisualizationDemo Signal Processing]], [[Programming Reference:VisualizationContainerDemo Signal Processing]]

	[[Category:Framework API]][[Category:Howto]][[Category:Development]]		[[Category:Framework API]][[Category:Howto]][[Category:Development]]