WaveformComponent Class Reference

Visual component for displaying audio waveforms with zoom and scroll. More...

#include <gin_waveformcomponent.h>

Inherits juce::Component.

Public Types
enum	ColourIds { lineColourId = 0x1231e10 , backgroundColourId = 0x1231e11 , traceColourId = 0x1231e12 , envelopeColourId = 0x1231f13 }

Public Member Functions
	WaveformComponent ()
	~WaveformComponent () override
	Destructor.
void	setHorizontalZoom (float zoom)
void	setHorizontalOffset (float offset)
void	setBuffer (juce::AudioSampleBuffer &buffer)
void	paint (juce::Graphics &g) override
void	resized () override

Detailed Description

Visual component for displaying audio waveforms with zoom and scroll.

WaveformComponent renders multi-channel audio waveforms with support for horizontal zooming and panning. It efficiently displays large audio buffers by downsampling to min/max envelopes at the current zoom level, providing smooth visualization even for long audio files.

Key Features:

• Multi-channel waveform display
• Horizontal zoom and scroll
• Efficient downsampling for display
• Min/max envelope rendering
• Customizable colors via ColourIds
• Automatic updates on resize
• Optimized for real-time display

Color Customization:

• lineColourId: Color for zero-crossing line
• backgroundColourId: Background color
• traceColourId: Waveform trace color
• envelopeColourId: Waveform envelope fill color

The component automatically processes the audio buffer into min/max pairs for efficient rendering at any zoom level, avoiding the need to draw individual samples when zoomed out.

Usage:

WaveformComponent waveform;
waveform.setBounds(0, 0, 800, 200);
 
// Set audio to display
AudioBuffer<float> audioData(2, 44100); // 2 channels, 1 second
// ... fill with audio data ...
waveform.setBuffer(audioData);
 
// Customize colors
waveform.setColour(WaveformComponent::traceColourId, Colours::blue);
waveform.setColour(WaveformComponent::envelopeColourId,
                  Colours::lightblue.withAlpha(0.3f));
 
// Zoom and scroll
waveform.setHorizontalZoom(2.0f);  // 2x zoom
waveform.setHorizontalOffset(0.25f); // Start at 25% through buffer

See also

juce::AudioSampleBuffer, juce::Component

Member Enumeration Documentation

ColourIds

enum WaveformComponent::ColourIds

Enumerator
lineColourId
backgroundColourId
traceColourId
envelopeColourId

Constructor & Destructor Documentation

WaveformComponent()

WaveformComponent::WaveformComponent

(

)

~WaveformComponent()

WaveformComponent::~WaveformComponent ( )

override

Destructor.

Member Function Documentation

setHorizontalZoom()

void WaveformComponent::setHorizontalZoom

(

float

zoom

)

setHorizontalOffset()

void WaveformComponent::setHorizontalOffset

(

float

offset

)

setBuffer()

void WaveformComponent::setBuffer

(

juce::AudioSampleBuffer &

buffer

)

paint()

void WaveformComponent::paint ( juce::Graphics & g )

override

resized()

void WaveformComponent::resized ( )

override

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The documentation for this class was generated from the following file:

• gin_waveformcomponent.h