Remarks
Renders the bitmap view of the given waveform range inside a graphical Device Context (HDC).
Before calling this method it's mandatory performing a previous sound's analysis through a call to the Waveform.AnalyzeFullSound method.
For further details about generating a waveform bitmap of the loaded sound, before starting its playback, refer to the How to obtain the sound's waveform tutorial.
Syntax
[Visual Basic]
Public Function BitmapViewDrawToHdc (
hDC as IntPtr,
nPosLeft as Int32,
nPosTop as Int32,
nWidth as Int32,
nHeight as Int32,
nWaveformStereoMode as enumWaveformStereoModes,
bUseHalfColorsForPeaks as Boolean,
bShowVerticalLines as Boolean,
nStartPos as Int32,
nEndPos as Int32
) as enumErrorCodes
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[C#]
public enumErrorCodes BitmapViewDrawToHdc (
IntPtr hDC,
Int32 nPosLeft,
Int32 nPosTop,
Int32 nWidth,
Int32 nHeight,
enumWaveformStereoModes nWaveformStereoMode,
bool bUseHalfColorsForPeaks,
bool bShowVerticalLines,
Int32 nStartPos,
Int32 nEndPos
);
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[C++]
public: enumErrorCodes BitmapViewDrawToHdc (
IntPtr hDC,
Int32 nPosLeft,
Int32 nPosTop,
Int32 nWidth,
Int32 nHeight,
enumWaveformStereoModes nWaveformStereoMode,
bool bUseHalfColorsForPeaks,
bool bShowVerticalLines,
Int32 nStartPos,
Int32 nEndPos
);
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Parameter
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Description
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hDC
|
Handle to the output graphical Device Context
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nPosLeft
|
Horizontal left position, expressed in pixels, of the destination rectangle where the bitmap will be rendered on the Device Context
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nPosTop
|
Vertical top position, expressed in pixels, of the destination rectangle where the bitmap will be rendered on the Device Context
|
nWidth
|
Width, expressed in pixels, of the destination rectangle on the Device Context
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nHeight
|
Height, expressed in pixels, of the destination rectangle on the Device Context
|
nWaveformStereoMode
|
Visualization mode used for displaying stereo sounds
Supported values are the following:
Mnemonic constant
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Value
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Meaning
|
STEREO_MODE_CHANNELS_BOTH
|
0
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Right and left channels are displayed separately on two different panes as seen on the pictures A and B above.
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STEREO_MODE_CHANNELS_LEFT
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1
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Only the left channel content is displayed on a single pane
|
STEREO_MODE_CHANNELS_RIGHT
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2
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Only the right channel content is displayed on a single pane
|
STEREO_MODE_CHANNELS_MIXED
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3
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Right and left channels contents are mixed together and displayed on a single pane
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bUseHalfColorsForPeaks
|
Boolean value that determines if waveform peaks will have a half intensity color.
Supported values are the following:
Mnemonic constant
|
Meaning
|
false
|
Doesn't use half color for peaks
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true (default)
|
Uses half color for peaks
|
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bShowVerticalLines
|
Boolean value that determines if eventual vertical lines, added through previous calls to the Waveform.BitmapViewVerticalLineAdd method, should be rendered as well.
Supported values are the following:
Mnemonic constant
|
Meaning
|
false
|
Doesn't render vertical lines
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true (default)
|
Renders vertical lines
|
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nStartPos
|
Number representing the sound's position, expressed in milliseconds, where the waveform visualization begins.
The value 0 represents the sound's beginning.
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nEndPos
|
Number representing the sound's position, expressed in milliseconds, where the waveform visualization ends.
The value -1 represents the sound's end.
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Return value
Value
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Meaning
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Negative value
|
An error occurred (see the LastError property for further error details)
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enumErrorCodes.NOERROR (0)
|
The method call was successful
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