QwtColorMapPreset Class Reference

Registry of named color map presets for scientific visualization. More...

#include <qwt_colormap_preset.h>

Public Types
enum	Preset {   Viridis , Plasma , Inferno , Magma ,   Cividis , Jet , Hot , Cool ,   Spring , Summer , Autumn , Winter ,   Gray , Bone , Copper , Rainbow ,   Hsv , Turbo , CoolWarm , RdYlBu ,   RdYlGn , Spectral }
	Built-in colormap presets. More...

Static Public Member Functions
static std::unique_ptr< QwtLinearColorMap >	create (Preset preset)
	Create a QwtLinearColorMap from a preset enum.
static std::unique_ptr< QwtLinearColorMap >	create (const QString &name)
	Create a QwtLinearColorMap from a preset name (case-insensitive)
static QStringList	availablePresets ()
	Get a list of all available preset names.
static QVector< QPair< double, QColor > >	colorStops (Preset preset)
	Get the color stops for a preset (position, color pairs)
static QString	presetName (Preset preset)
	Convert a preset enum to its string name.
static Preset	presetFromName (const QString &name)
	Convert a string name to a preset enum (returns -1 if not found)

Detailed Description

Registry of named color map presets for scientific visualization.

QwtColorMapPreset provides factory methods to create QwtLinearColorMap instances from well-known colormap names used in scientific computing and data visualization (matplotlib, MATLAB, etc.).

Each preset is defined by a set of color stops at specific positions in the [0.0, 1.0] range, enabling smooth multi-stop gradient interpolation.

Example

QwtLinearColorMap cmap = QwtColorMapPreset::create("viridis");
// Use cmap->rgb(0.0, 100.0, 50.0) to get the color at the midpoint

See also

QwtColorMap, QwtLinearColorMap

Member Enumeration Documentation

Preset

enum QwtColorMapPreset::Preset

Built-in colormap presets.

Enumerator
Viridis	Perceptually uniform purple-green-yellow (matplotlib default)
Plasma	Perceptually uniform purple-orange-yellow.
Inferno	Perceptually uniform black-red-orange-yellow.
Magma	Perceptually uniform black-purple-orange-yellow.
Cividis	Perceptually uniform blue-gray-yellow (colorblind-friendly)
Jet	Blue-cyan-green-yellow-red (MATLAB default)
Hot	Black-red-yellow-white.
Cool	Cyan-white.
Spring	Magenta-yellow.
Summer	Green-white.
Autumn	Red-yellow-white.
Winter	Blue-white.
Gray	Black-white grayscale.
Bone	Black-gray-white with blue tint.
Copper	Black-copper.
Rainbow	Red-yellow-green-cyan-blue-magenta-red.
Hsv	Full HSV cycle.
Turbo	Improved rainbow (Google's turbo)
CoolWarm	Blue-white-red diverging.
RdYlBu	Red-yellow-blue diverging.
RdYlGn	Red-yellow-green diverging.
Spectral	Multi-hue diverging.

Member Function Documentation

availablePresets()

QStringList QwtColorMapPreset::availablePresets ( )

static

Get a list of all available preset names.

Returns

List of preset name strings

colorStops()

QVector< QPair< double, QColor > > QwtColorMapPreset::colorStops ( Preset  preset )

static

Get the color stops for a preset (position, color pairs)

Get the color stops for a preset.

Parameters

preset

Preset selector

Returns

Vector of (position, color) pairs

create() [1/2]

std::unique_ptr< QwtLinearColorMap > QwtColorMapPreset::create ( const QString &  name )

static

Create a QwtLinearColorMap from a preset name (case-insensitive)

Parameters

name	Preset name string

Returns

A QwtLinearColorMap with the preset's color stops applied

create() [2/2]

std::unique_ptr< QwtLinearColorMap > QwtColorMapPreset::create ( Preset  preset )

static

Create a QwtLinearColorMap from a preset enum.

Create a QwtLinearColorMap from a preset.

Parameters

preset

Preset selector

Returns

A QwtLinearColorMap with the preset's color stops applied

presetFromName()

QwtColorMapPreset::Preset QwtColorMapPreset::presetFromName ( const QString &  name )

static

Convert a string name to a preset enum (returns -1 if not found)

Convert a string name to a preset enum.

Parameters

name	Case-insensitive preset name

Returns

Preset enum value, or Viridis if not found

presetName()

QString QwtColorMapPreset::presetName ( Preset  preset )

static

Convert a preset enum to its string name.

Parameters

preset

Preset selector

Returns

Lowercase name string

---

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

• /home/runner/work/QWT/QWT/src/core/qwt_colormap_preset.h
• /home/runner/work/QWT/QWT/src/core/qwt_colormap_preset.cpp