Methods > Graphic items management > GraphicItemHorizontalLineAdd method

Remarks

Adds a new horizontal line that will be displayed over the waveform's graphics.

On the screenshot below you can see a set of horizontal lines displayed over the waveform, each with its own set of properties, positions and buddy text:

This line can be manually moved on the screen in one of the following ways:

•	horizontally through code using the GraphicItemHorzPositionSet method

•	vertically through code using the GraphicItemVertPositionSet method or through the GraphicItemHorizontalLineParamsSet method.

•	horizontally and vertically through the mouse, causing a sequence of WaveAnalyzerHorzLineMoveBegin, WaveAnalyzerHorzLineMoving and WaveAnalyzerHorzLineMoveEnd events to be generated.

During playback of the loaded sound, the WaveAnalyzerHorzLineReached event is generated when playback position reaches the start position of the horizontal line and the WaveAnalyzerHorzLineLeaved event is generated when playback position leaves the end position of the horizontal line.

This method fails if no sound is currently loaded into the editor.

The horizontal line is automatically destroyed, as all of the other existing graphic items, when the loaded sound is discarded from memory through the FreeMemory method.

A horizontal line can be removed through the GraphicItemRemove method and hidden or shown through the GraphicItemShow method.

For details about graphic items management on the waveform analyzer refer to the How to add graphic items to the Waveform analyzer section.

Syntax

[Visual Basic]

control.GraphicItemHorizontalLineAdd (

strFriendlyName as String,

strDescription as String,

nStartPosInMs as Long,

nEndPosInMs as Long,

settings as Long

) as Integer

[C++]

short control.GraphicItemHorizontalLineAdd (

LPCTSTR strFriendlyName,

LPCTSTR strDescription,

long nStartPosInMs,

long nEndPosInMs,

void *settings

);

Parameter	Description

strFriendlyName	Friendly name of the line. This friendly name can be modified or retrieved at a later time through the GraphicItemNameGet and GraphicItemNameSet methods.
strDescription	Description of the line. This description can be modified or retrieved at a later time through the GraphicItemDescriptionGet and GraphicItemDescriptionSet methods.
nStartPosInMs	Start position expressed in milliseconds. This position can be modified or retrieved at a later time through the GraphicItemHorzPositionGet and GraphicItemHorzPositionSet methods.
nEndPosInMs	End position expressed in milliseconds. This position can be modified or retrieved at a later time through the GraphicItemHorzPositionGet and GraphicItemHorzPositionSet methods.
settings	Address of a structure of type WANALYZER_HORIZONTAL_LINE that contains the settings for the new line. These settings can be modified or retrieved at a later time through the GraphicItemHorizontalLineParamsSet and GraphicItemHorizontalLineParamsGet methods. By setting this value to 0 the graphic item will be rendered with default setting.

Return value

Value	Meaning

0	An error occurred (see the LastError property for further error details)
Value > 0	Unique identification number assigned to this new line.