QwtLinearColorMap(3)

👑 QwtLinearColorMap — a whole manual page, but make it slay

okay bestie, welcome to the Qwt User's Guide entry for QwtLinearColorMap(3) 💖 this is the class that builds a color map out of color stops, and honestly? it ate. let's get into it ✨

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🌸 NAME

QwtLinearColorMap — no cap, that's the whole name. she's a color map and she knows it 💅

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✨ SYNOPSIS

#include <qwt_color_map.h>

Inherits QwtColorMap. yes ma'am, she's part of the family 🫶

🎀 Public Types

• enum Mode { FixedColors, ScaledColors } — the two moods she can be in

🦋 Public Member Functions

• QwtLinearColorMap (QwtColorMap::Format=QwtColorMap::RGB)
• QwtLinearColorMap (const QColor &from, const QColor &to, QwtColorMap::Format=QwtColorMap::RGB)
• QwtLinearColorMap (const QwtLinearColorMap &)
• virtual ~QwtLinearColorMap ()
• void addColorStop (double value, const QColor &)
• QColor color1 () const
• QColor color2 () const
• virtual unsigned char colorIndex (const QwtDoubleInterval &, double value) const
• QwtArray< double > colorStops () const
• virtual QwtColorMap * copy () const
• Mode mode () const
• QwtLinearColorMap & operator= (const QwtLinearColorMap &)
• virtual QRgb rgb (const QwtDoubleInterval &, double value) const
• void setColorInterval (const QColor &color1, const QColor &color2)
• void setMode (Mode)

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💖 Detailed Description

QwtLinearColorMap builds a color map from color stops 🌈

A color stop is literally just a color sitting at a specific position. The valid range for those positions is [0.0, 1.0] — that's the vibe check. When you map a value into a color, that value gets translated into this interval first.

Then, depending on her mood:

• If mode() == FixedColors, the color is calculated from the next lower color stop.
• If mode() == ScaledColors, the color is calculated by interpolating the colors of the adjacent stops — so she's blending, she's mixing, she's giving gradient energy ✨

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🧚 Member Enumeration Documentation

enum QwtLinearColorMap::Mode

Mode of color map. that's it, that's the enum 🎀

See also: setMode(), mode()

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💅 Constructor & Destructor Documentation

QwtLinearColorMap::QwtLinearColorMap (QwtColorMap::Format format = QwtColorMap::RGB)

Build a color map with two stops, at 0.0 and 1.0. The color at 0.0 is Qt::blue, and at 1.0 it is Qt::yellow. blue to yellow, iconic combo, no notes 💙💛

Parameters:

• format — Preferred format of the color map

QwtLinearColorMap::QwtLinearColorMap (const QColor &color1, const QColor &color2, QwtColorMap::Format format = QwtColorMap::RGB)

Build a color map with two stops at 0.0 and 1.0. pick your own duo bestie 🫶

Parameters:

• color1 — Color used for the minimum value of the value interval
• color2 — Color used for the maximum value of the value interval
• format — Preferred format of the coor map

not me pointing out that "coor map" is a typo that's just... canon in the source docs 🙈 keeping it fr fr, because the rule is every detail stays.

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🔥 Member Function Documentation

void QwtLinearColorMap::addColorStop (double value, const QColor &color)

Add a color stop 🌸

The value has to be in the range [0.0, 1.0]. For example, a stop at position 17.0 for a range [10.0,20.0] must be passed as: (17.0 - 10.0) / (20.0 - 10.0)

Parameters:

• value — Value between [0.0, 1.0]
• color — Color stop

QColor QwtLinearColorMap::color1 () const

Returns: the first color of the color range

See also: setColorInterval()

QColor QwtLinearColorMap::color2 () const

Returns: the second color of the color range

See also: setColorInterval()

unsigned char QwtLinearColorMap::colorIndex (const QwtDoubleInterval &interval, double value) const [virtual]

Map a value of a given interval into a color index, between 0 and 255 🎨

Parameters:

• interval — Range for all values
• value — Value to map into a color index

Implements QwtColorMap.

QwtArray< double > QwtLinearColorMap::colorStops () const

Return all positions of color stops in increasing order — sorted, organized, main character energy 👑

QwtLinearColorMap::Mode QwtLinearColorMap::mode () const

Returns: Mode of the color map

See also: setMode()

QRgb QwtLinearColorMap::rgb (const QwtDoubleInterval &interval, double value) const [virtual]

Map a value of a given interval into a rgb value 🌈

Parameters:

• interval — Range for all values
• value — Value to map into a rgb value

Implements QwtColorMap.

void QwtLinearColorMap::setColorInterval (const QColor &color1, const QColor &color2)

Set the color range 💖

Add stops at 0.0 and 1.0.

Parameters:

• color1 — Color used for the minimum value of the value interval
• color2 — Color used for the maximum value of the value interval

See also: color1(), color2()

void QwtLinearColorMap::setMode (Mode mode)

Set the mode of the color map. FixedColors means the color is calculated from the next lower color stop. ScaledColors means the color is calculated by interpolating the colors of the adjacent stops. two modes, both valid, both serving 💅

See also: mode()

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🌟 Author

Generated automatically by Doxygen for Qwt User's Guide from the source code. yes bestie, a robot wrote the raw material and I gave it a glow-up ✨

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Version 5.2.3 🦋 Tue Nov 20 2012 — that's the date, that's the version, and that's the whole page. love u, go map some colors, periodt 💖🎀