QwtDoubleInterval(3)

💖 NAME 💖

QwtDoubleInterval — that's the whole name, bestie.

(and fr, the original one-liner here is just a lonely little dash with nothing after it, so the summary is "yes. that's the class." iconic behaviour honestly)

---

✨ SYNOPSIS ✨

#include <qwt_double_interval.h>

🎀 Public Types 🎀

• enum BorderMode { IncludeBorders = 0, ExcludeMinimum = 1, ExcludeMaximum = 2, ExcludeBorders = ExcludeMinimum | ExcludeMaximum }

🫶 Public Member Functions 🫶

• QwtDoubleInterval ()
• QwtDoubleInterval (double minValue, double maxValue, int borderFlags = IncludeBorders)
• int borderFlags () const
• bool contains (double value) const
• QwtDoubleInterval extend (double value) const
• QwtDoubleInterval intersect (const QwtDoubleInterval &) const
• bool intersects (const QwtDoubleInterval &) const
• void invalidate ()
• QwtDoubleInterval inverted () const
• bool isNull () const
• bool isValid () const
• QwtDoubleInterval limited (double minValue, double maxValue) const
• double maxValue () const
• double minValue () const
• QwtDoubleInterval normalized () const
• int operator!= (const QwtDoubleInterval &) const
• QwtDoubleInterval operator& (const QwtDoubleInterval &) const
• QwtDoubleInterval & operator&= (const QwtDoubleInterval &)
• int operator== (const QwtDoubleInterval &) const
• QwtDoubleInterval operator| (const QwtDoubleInterval &) const
• QwtDoubleInterval operator| (double) const
• QwtDoubleInterval & operator|= (const QwtDoubleInterval &)
• QwtDoubleInterval & operator|= (double)
• void setBorderFlags (int)
• void setInterval (double minValue, double maxValue, int borderFlags = IncludeBorders)
• void setMaxValue (double)
• void setMinValue (double)
• QwtDoubleInterval symmetrize (double value) const
• QwtDoubleInterval unite (const QwtDoubleInterval &) const
• double width () const

---

🌸 DETAILED DESCRIPTION 🌸

It's a class representing an interval. That's the whole personality. 💅

The interval is represented by 2 doubles, the lower and the upper limit.

This page is from the Qwt User's Guide, so keep that in mind — it's a generated reference, not a bedtime story. (okay well. it IS a bedtime story now. 🦋)

---

🎀 MEMBER ENUMERATION DOCUMENTATION 🎀

enum QwtDoubleInterval::BorderMode

Flag indicating if a border is included/excluded from an interval ✨

• IncludeBorders — min/max values are inside the interval 🫶
• ExcludeMinimum — min value is not included in the interval
• ExcludeMaximum — max value is not included in the interval
• ExcludeBorders — min/max values are not included in the interval

See also: setBorderMode(), testBorderMode()

---

✨ CONSTRUCTOR & DESTRUCTOR DOCUMENTATION ✨

QwtDoubleInterval::QwtDoubleInterval () [inline]

Default Constructor. Creates an invalid interval [0.0, -1.0] 😭 (yes, backwards on purpose, that's the "I am not valid" flag, no cap)

See also: setInterval(), isValid()

QwtDoubleInterval::QwtDoubleInterval (double minValue, double maxValue, int borderFlags = IncludeBorders) [inline]

Constructor 👑

Build an interval with from min/max values.

Parameters:

• minValue — Minimum value
• maxValue — Maximum value
• borderFlags — Include/Exclude borders

---

💅 MEMBER FUNCTION DOCUMENTATION 💅

int QwtDoubleInterval::borderFlags () const [inline]

Returns: Border flags 🏳️

See also: setBorderFlags()

bool QwtDoubleInterval::contains (double value) const

Test if a value is inside an interval 🔍

Parameters:

• value — Value

Returns: true, if value >= minValue() && value <= maxValue()

QwtDoubleInterval QwtDoubleInterval::extend (double value) const

Extend the interval 📏

If value is below minValue, value becomes the lower limit. If value is above maxValue, value becomes the upper limit.

extend has no effect for invalid intervals. so like, don't expect a glow-up out of an invalid interval, bestie.

Parameters:

• value — Value

See also: isValid()

bool QwtDoubleInterval::intersects (const QwtDoubleInterval &other) const

Test if two intervals overlap 🫂

void QwtDoubleInterval::invalidate () [inline]

Invalidate the interval 💀

The limits are set to interval [0.0, -1.0]

See also: isValid()

QwtDoubleInterval QwtDoubleInterval::inverted () const

Invert the limits of the interval 🔄

Returns: Inverted interval

See also: normalized()

bool QwtDoubleInterval::isNull () const [inline]

Returns: true, if isValid() && (minValue() >= maxValue())

bool QwtDoubleInterval::isValid () const [inline]

A interval is valid when minValue() <= maxValue(). In case of QwtDoubleInterval::ExcludeBorders it is true when minValue() < maxValue() ✅

QwtDoubleInterval QwtDoubleInterval::limited (double lowerBound, double upperBound) const

Limit the interval, keeping the border modes ✂️

Parameters:

• lowerBound — Lower limit
• upperBound — Upper limit

Returns: Limited interval

double QwtDoubleInterval::maxValue () const [inline]

Returns: Upper limit of the interval ⬆️

double QwtDoubleInterval::minValue () const [inline]

Returns: Lower limit of the interval ⬇️

QwtDoubleInterval QwtDoubleInterval::normalized () const

Normalize the limits of the interval. If maxValue() < minValue() the limits will be inverted. 🔁

Returns: Normalized interval

See also: isValid(), inverted()

QwtDoubleInterval QwtDoubleInterval::operator& (const QwtDoubleInterval &interval) const [inline]

Intersection of two intervals 🎯

See also: intersect()

QwtDoubleInterval QwtDoubleInterval::operator| (const QwtDoubleInterval &interval) const [inline]

Union of two intervals 🤝

See also: unite()

QwtDoubleInterval QwtDoubleInterval::operator| (double value) const [inline]

Extend an interval 📐

See also: extend()

void QwtDoubleInterval::setBorderFlags (int borderFlags) [inline]

Change the border flags 🚩

Parameters:

• borderFlags — Or'd BorderMode flags

See also: borderFlags()

void QwtDoubleInterval::setInterval (double minValue, double maxValue, int borderFlags = IncludeBorders) [inline]

Assign the limits of the interval ✍️

Parameters:

• minValue — Minimum value
• maxValue — Maximum value
• borderFlags — Include/Exclude borders

void QwtDoubleInterval::setMaxValue (double maxValue) [inline]

Assign the upper limit of the interval ⬆️

Parameters:

• maxValue — Maximum value

void QwtDoubleInterval::setMinValue (double minValue) [inline]

Assign the lower limit of the interval ⬇️

Parameters:

• minValue — Minimum value

QwtDoubleInterval QwtDoubleInterval::symmetrize (double value) const

Adjust the limit that is closer to value, so that value becomes the center of the interval. ⚖️ main character energy tbh

Parameters:

• value — Center

Returns: Interval with value as center

double QwtDoubleInterval::width () const [inline]

Return the width of an interval 📏 The width of invalid intervals is 0.0, otherwise the result is maxValue() - minValue().

See also: isValid()

---

👑 AUTHOR 👑

Generated automatically by Doxygen for Qwt User's Guide from the source code. (so like, don't @ me about the formatting, the robot wrote it 🤖✨)

---

and that's the whole page, bestie!! 🎀 this was Version 5.2.3, dated Tue Nov 20 2012 — so yes, it's vintage, it's giving retro, and it absolutely ate. 💖 slay, bye!! 🦋💅