Qwt3DStandardColor Class Reference

Standard color model for Qwt3DPlot - implements the data driven operator()(double x, double y, double z) More...

#include <qwt3d_color.h>

Inheritance diagram for Qwt3DStandardColor:

Classes
class	PrivateData

Public Member Functions
	Qwt3DStandardColor (unsigned size=100)
	Constructs a Qwt3DStandardColor object.
RGBA	operator() (double x, double y, double z) const override
	Returns the color for a given z value.
void	setColorVector (ColorVector const &cv)
	Assigns a new ColorVector.
void	reset (unsigned size=100)
void	setAlpha (double a)
	Sets the alpha value for all colors.
ColorVector &	createVector (ColorVector &vec) override
	Creates color vector for Qwt3DColorLegend - essentially a copy from the internal vector.
void	setPreset (const QString &presetName, unsigned size=100)
	Set colormap from a preset name.
QString	presetName () const
	返回当前 preset 名称
unsigned	colorCount () const
	返回颜色向量中的颜色数量
double	alpha () const
	返回上次 setAlpha() 设置的 alpha 值
Public Member Functions inherited from Qwt3DColor
virtual RGBA	operator() (Triple const &t) const
void	destroy () const
void	setActiveRange (double zMin, double zMax)
	Sets the active z-range used for color normalization (pushed by the owning Qwt3DPlotItem before VBO/legend build)

Additional Inherited Members
Protected Member Functions inherited from Qwt3DColor
double	activeZMin () const
	Lower bound of the active z-range (default 0.0)
double	activeZMax () const
	Upper bound of the active z-range (default 1.0)

Detailed Description

Standard color model for Qwt3DPlot - implements the data driven operator()(double x, double y, double z)

The class has a ColorVector representing z values, which will be used by operator()(double x, double y, double z)

Constructor & Destructor Documentation

Qwt3DStandardColor()

Qwt3DStandardColor::Qwt3DStandardColor ( unsigned  size = 100 )

explicit

Constructs a Qwt3DStandardColor object.

Parameters

size	Number of color entries in the color vector

Creates a standard color mapping with the specified size and resets the color vector to default gradient values. The z-range used for color normalization is pushed in by the owning Qwt3DPlotItem via setActiveRange() (defaults to [0, 1] until set).

Resets the color vector to the default colormap

Parameters

size	Number of color entries to generate

Creates a color vector of the given size sampled from the viridis colormap, the modern perceptually-uniform default.

Member Function Documentation

alpha()

double Qwt3DStandardColor::alpha

(

)

const

返回上次 setAlpha() 设置的 alpha 值

Returns

alpha 值（0.0 ~ 1.0），默认 1.0

colorCount()

unsigned Qwt3DStandardColor::colorCount

(

)

const

返回颜色向量中的颜色数量

Returns

颜色数量

createVector()

ColorVector & Qwt3DStandardColor::createVector ( ColorVector &  vec )

overridevirtual

Creates color vector for Qwt3DColorLegend - essentially a copy from the internal vector.

Parameters

vec	The vector to fill

Returns

Reference to the filled color vector

Reimplemented from Qwt3DColor.

operator()()

RGBA Qwt3DStandardColor::operator() ( double  x, double  y, double  z  ) const

overridevirtual

Returns the color for a given z value.

Parameters

z	The z coordinate value for color lookup

Returns

RGBA color corresponding to the z value

Maps the z value to a color index based on the active z-range pushed in by the owning Qwt3DPlotItem via setActiveRange().

Implements Qwt3DColor.

presetName()

QString Qwt3DStandardColor::presetName

(

)

const

返回当前 preset 名称

Returns

preset 名称字符串，如果通过 setColorVector() 设置则返回空字符串

setAlpha()

void Qwt3DStandardColor::setAlpha

(

double

a

)

Sets the alpha value for all colors.

Parameters

a	Alpha value (0.0 to 1.0)

Silent mutation: call Qwt3DSurface::invalidateColors() to rebuild.

setColorVector()

void Qwt3DStandardColor::setColorVector

(

ColorVector const &

cv

)

Assigns a new ColorVector.

Parameters

cv	The new color vector (also overwrites the constructor's size argument)

This is a silent mutation: the owning Qwt3DPlotItem is not notified. Call Qwt3DSurface::invalidateColors() afterwards to trigger a VBO rebuild.

setPreset()

void Qwt3DStandardColor::setPreset	(	const QString &	presetName,
		unsigned	size = 100
	)

Set colormap from a preset name.

Parameters

presetName	Name of the colormap preset (e.g. "viridis", "plasma", "jet")
size	Number of color stops to sample from the colormap

Uses QwtColorMapPreset to create a QwtLinearColorMap and samples it at the specified number of points to fill the internal color vector.

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

• /home/runner/work/QWT/QWT/src/plot3d/qwt3d_color.h
• /home/runner/work/QWT/QWT/src/plot3d/qwt3d_color.cpp