The Length class is used to represent a length (for example 12.75 millimeters) More...

#include <length.h>

Collaboration diagram for Length:

Public Member Functions
constexpr	Length () noexcept
	Default Constructor. More...

constexpr	Length (const Length &length) noexcept
	Copy Constructor. More...

constexpr	Length (LengthBase_t nanometers) noexcept
	Constructor with length in nanometers. More...

	~Length ()=default
	Destructor. More...

void	setLengthNm (LengthBase_t nanometers) noexcept
	Set the length in nanometers. More...

void	setLengthMm (qreal millimeters)
	Set the length in millimeters. More...

void	setLengthMm (const QString &millimeters)
	Set the length in millimeters, represented in a QString. More...

void	setLengthInch (qreal inches)
	Set the length in inches. More...

void	setLengthMil (qreal mils)
	Set the length in mils (1/1000 inch) More...

void	setLengthPx (qreal pixels)
	Set the length in pixels (from QGraphics* objects) More...

LengthBase_t	toNm () const noexcept
	Get the length in nanometers. More...

QString	toNmString () const noexcept
	Get the length in nanometers as a QString. More...

qreal	toMicrometers () const noexcept
	Get the length in micrometers. More...

qreal	toMm () const noexcept
	Get the length in millimeters. More...

QString	toMmString () const noexcept
	Get the length in millimeters as a QString. More...

qreal	toInch () const noexcept
	Get the length in inches. More...

qreal	toMil () const noexcept
	Get the length in mils (1/1000 inches) More...

qreal	toPx () const noexcept
	Get the length in pixels (for QGraphics* objects) More...

Length	abs () const noexcept
	Get a Length object with absolute value (mNanometers >= 0) More...

Length &	makeAbs () noexcept
	Make the length absolute (mNanometers >= 0) More...

Length	mappedToGrid (const Length &gridInterval) const noexcept
	Get a Length object which is mapped to a specific grid interval. More...

Length &	mapToGrid (const Length &gridInterval) noexcept
	Map this Length object to a specific grid interval. More...

Length	scaled (qreal factor) const noexcept
	Get a Length object which is scaled with a specific factor. More...

Length &	scale (qreal factor) noexcept
	Scale this Length object with a specific factor. More...

Length &	operator= (const Length &rhs)

Length &	operator+= (const Length &rhs)

Length &	operator-= (const Length &rhs)

Length &	operator*= (const Length &rhs)

Length &	operator*= (LengthBase_t rhs)

Length &	operator/= (const Length &rhs)

Length &	operator/= (LengthBase_t rhs)

Length	operator+ (const Length &rhs) const

Length	operator- () const

Length	operator- (const Length &rhs) const

Length	operator* (const Length &rhs) const

Length	operator* (LengthBase_t rhs) const

Length	operator/ (const Length &rhs) const

Length	operator/ (LengthBase_t rhs) const

Length	operator% (const Length &rhs) const

constexpr bool	operator> (const Length &rhs) const

constexpr bool	operator> (LengthBase_t rhs) const

constexpr bool	operator< (const Length &rhs) const

constexpr bool	operator< (LengthBase_t rhs) const

constexpr bool	operator>= (const Length &rhs) const

constexpr bool	operator>= (LengthBase_t rhs) const

constexpr bool	operator<= (const Length &rhs) const

constexpr bool	operator<= (LengthBase_t rhs) const

constexpr bool	operator== (const Length &rhs) const

constexpr bool	operator== (LengthBase_t rhs) const

constexpr bool	operator!= (const Length &rhs) const

constexpr bool	operator!= (LengthBase_t rhs) const

Static Public Member Functions
static bool	isValidMm (qreal millimeters) noexcept
	Check if a float value in millimeters is in the allowed range. More...

static Length	fromMm (qreal millimeters, const Length &gridInterval=Length(0))
	Get a Length object with a specific length and map it to a specific grid. More...

static Length	fromMm (const QString &millimeters, const Length &gridInterval=Length(0))
	Get a Length object with a specific length and map it to a specific grid. More...

static Length	fromInch (qreal inches, const Length &gridInterval=Length(0))
	Get a Length object with a specific length and map it to a specific grid. More...

static Length	fromMil (qreal mils, const Length &gridInterval=Length(0))
	Get a Length object with a specific length and map it to a specific grid. More...

static Length	fromPx (qreal pixels, const Length &gridInterval=Length(0))
	Get a Length object with a specific length and map it to a specific grid. More...

static Length	min () noexcept
	Get the smallest possible length value. More...

static Length	max () noexcept
	Get the highest possible length value. More...

Private Member Functions
void	setLengthFromFloat (qreal nanometers)
	Set the length from a floating point number in nanometers. More...

Static Private Member Functions
static bool	checkRange (qreal nanometers, bool doThrow=false)
	Check if a float value in nanometers is in the allowed range. More...

static LengthBase_t	mapNmToGrid (LengthBase_t nanometers, const Length &gridInterval) noexcept
	Map a length in nanometers to a grid interval in nanometers. More...

static LengthBase_t	mmStringToNm (const QString &millimeters)
	Convert a length from a QString (in millimeters) to an integer (in nanometers) More...

Private Attributes
LengthBase_t	mNanometers
	the length in nanometers More...

Static Private Attributes
static constexpr LengthBase_t	sNmPerInch = 25400000
	1 inch = 25.4mm More...

static constexpr LengthBase_t	sNmPerMil = 25400
	1 inch = 25.4mm More...

static constexpr LengthBase_t	sPixelsPerInch
	72 dpi for the QGraphics* objects More...

static constexpr qreal	sNmPerPixel = (qreal)sNmPerInch / sPixelsPerInch

static constexpr qreal	sPixelsPerNm = (qreal)sPixelsPerInch / sNmPerInch

Detailed Description

The Length class is used to represent a length (for example 12.75 millimeters)

This class is used to represent ALL length values in Symbols, Schematics, Footprints, Layouts and so on. You should never use another length type, like integer or float! It's very important to have a consistent length type over the whole project.

All lengths are stored in the integer base type librepcb::LengthBase_t. The internal unit is always nanometers, but this class provides also some converting methods to other units. Read the documentation of librepcb::LengthBase_t for more details.

Constructor & Destructor Documentation

◆ Length() [1/3]

constexpr Length ( )

inlinenoexcept

Default Constructor.

The length will be initialized with zero nanometers.

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◆ Length() [2/3]

constexpr Length ( const Length & length )

inlinenoexcept

Copy Constructor.

Parameters

length Another Length object

◆ Length() [3/3]

constexpr Length ( LengthBase_t nanometers )

inlinenoexcept

Constructor with length in nanometers.

Parameters

nanometers The length in nanometers

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◆ ~Length()

~Length ( )

default

Destructor.

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Member Function Documentation

◆ setLengthNm()

void setLengthNm ( LengthBase_t nanometers )

inlinenoexcept

Set the length in nanometers.

Parameters

nanometers The length in nanometers

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◆ setLengthMm() [1/2]

void setLengthMm ( qreal millimeters )

inline

Set the length in millimeters.

Parameters

millimeters The length in millimeters

Warning: Please note that this method can decrease the precision of the length! If you need a length which is located exactly on the grid of a QGraphicsView (which is often required), you need to call mapToGrid() afterwards!

Exceptions

RangeError If the argument is out of range, a RangeError exception will be thrown

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◆ setLengthMm() [2/2]

void setLengthMm ( const QString & millimeters )

inline

Set the length in millimeters, represented in a QString.

Parameters

millimeters The length in millimeters in a QString with locale "C"

Note: This method is useful to read lengths from files! The problem with decreased precision does NOT exist by using this method!

Exceptions

Exception If the string is not valid or the number is out of range, an Exception will be thrown

See also: toMmString(), fromMm(const QString&, const Length&)

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◆ setLengthInch()

void setLengthInch ( qreal inches )

inline

Set the length in inches.

Parameters

inches The length in inches

Warning: Please note that this method can decrease the precision of the length! If you need a length which is located exactly on the grid of a QGraphicsView (which is often required), you need to call mapToGrid() afterwards!

Exceptions

RangeError If the argument is out of range, a RangeError exception will be thrown

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◆ setLengthMil()

void setLengthMil ( qreal mils )

inline

Set the length in mils (1/1000 inch)

Parameters

mils	The length in mils

Warning: Please note that this method can decrease the precision of the length! If you need a length which is located exactly on the grid of a QGraphicsView (which is often required), you need to call mapToGrid() afterwards!

Exceptions

RangeError If the argument is out of range, a RangeError exception will be thrown

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◆ setLengthPx()

void setLengthPx ( qreal pixels )

inline

Set the length in pixels (from QGraphics* objects)

Parameters

pixels The length in pixels, from a QGraphics* object

Note: This method is useful to read lengths from QGraphics* objects.

Warning: Please note that this method can decrease the precision of the length! If you need a length which is located exactly on the grid of a QGraphicsView (which is often required), you need to call mapToGrid() afterwards!

Exceptions

RangeError If the argument is out of range, a RangeError exception will be thrown

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◆ toNm()

LengthBase_t toNm ( ) const

inlinenoexcept

Get the length in nanometers.

Returns: The length in nanometers

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◆ toNmString()

QString toNmString ( ) const

inlinenoexcept

Get the length in nanometers as a QString.

Returns: The length in nanometers as a QString. The used locale is always "C".

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◆ toMicrometers()

qreal toMicrometers ( ) const

inlinenoexcept

Get the length in micrometers.

Returns: The length in micrometers

Warning: Be careful with this method, as it can decrease the precision!

◆ toMm()

qreal toMm ( ) const

inlinenoexcept

Get the length in millimeters.

Returns: The length in millimeters

Warning: Be careful with this method, as it can decrease the precision!

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◆ toMmString()

QString toMmString ( ) const

noexcept

Get the length in millimeters as a QString.

Returns: The length in millimeters as a QString. The used locale is always "C".

Note: This method is useful to store lengths in files. The problem with decreased precision does NOT exist by using this method!

See also: setLengthMm(const QString&), fromMm(const QString&, const Length&)

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◆ toInch()

qreal toInch ( ) const

inlinenoexcept

Get the length in inches.

Returns: The length in inches

Warning: Be careful with this method, as it can decrease the precision!

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◆ toMil()

qreal toMil ( ) const

inlinenoexcept

Get the length in mils (1/1000 inches)

Returns: The length in mils

Warning: Be careful with this method, as it can decrease the precision!

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◆ toPx()

qreal toPx ( ) const

inlinenoexcept

Get the length in pixels (for QGraphics* objects)

Returns: The length in QGraphics* pixels

Note: This method is useful to set the length/position of a QGraphics* object.

Warning: Be careful with this method, as it can decrease the precision!

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◆ abs()

Length abs ( ) const

noexcept

Get a Length object with absolute value (mNanometers >= 0)

Returns: A new Length object with absolute value

See also: librepcb::Length::makeAbs()

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◆ makeAbs()

Length & makeAbs ( )

noexcept

Make the length absolute (mNanometers >= 0)

Returns: A reference to the modified object

See also: librepcb::Length::abs()

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◆ mappedToGrid()

Length mappedToGrid ( const Length & gridInterval ) const

noexcept

Get a Length object which is mapped to a specific grid interval.

Parameters

gridInterval The grid interval in nanometers (e.g. 2540000 for 2.54mm). If this parameter is zero, this method will do nothing.

Returns: A new Length object which is mapped to the grid

See also: mapToGrid()

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◆ mapToGrid()

Length & mapToGrid ( const Length & gridInterval )

noexcept

Map this Length object to a specific grid interval.

Parameters

gridInterval The grid interval in nanometers (e.g. 2540000 for 2.54mm). If this parameter is zero, this method will do nothing.

Returns: A reference to the modified object

See also: mappedToGrid()

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◆ scaled()

Length scaled ( qreal factor ) const

noexcept

Get a Length object which is scaled with a specific factor.

Parameters

factor The scale factor (1.0 does nothing)

Returns: A new Length object which is scaled

Warning: Be careful with this method, as it can decrease the precision! To scale with an integer factor, use operator*() instead.

See also: scale()

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◆ scale()

Length & scale ( qreal factor )

noexcept

Scale this Length object with a specific factor.

Parameters

factor The scale factor (1.0 does nothing)

Returns: A reference to the modified object

Warning: Be careful with this method, as it can decrease the precision! To scale with an integer factor, use operator*=() instead.

See also: scaled()

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◆ isValidMm()

static bool isValidMm ( qreal millimeters )

inlinestaticnoexcept

Check if a float value in millimeters is in the allowed range.

Parameters

millimeters The value to check

Return values

true	Value is valid, can construct a Length from it.
false	Value is invalid, constructing a Length would throw.

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◆ fromMm() [1/2]

Length fromMm	(	qreal	millimeters,
		const Length &	gridInterval = `Length(0)`
	)

static

Get a Length object with a specific length and map it to a specific grid.

Parameters

millimeters	See setLengthMm(qreal)
gridInterval	See mapToGrid()

Returns: A new Length object with a length which is mapped to the specified grid

Warning: Please note that this method can decrease the precision of the length! If you need a length which is located exactly on the grid of a QGraphicsView (which is often required), you need to call mapToGrid() afterwards!

Exceptions

RangeError If the argument is out of range, a RangeError exception will be thrown

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◆ fromMm() [2/2]

Length fromMm	(	const QString &	millimeters,
		const Length &	gridInterval = `Length(0)`
	)

static

Get a Length object with a specific length and map it to a specific grid.

This method can be used to create a Length object from a QString which contains a floating point number in millimeters, like QString("123.456") for 123.456 millimeters. The string must not depend on the locale settings (see QLocale), it have always to represent a number in the "C" locale. The maximum count of decimals after the decimal point is 6, because the 6th decimal represents one nanometer.

Parameters

millimeters	See setLengthMm(const QString&)
gridInterval	See mapToGrid()

Returns: A new Length object with a length which is mapped to the specified grid

Note: This method is useful to read lengths from files! The problem with decreased precision does NOT exist by using this method!

Exceptions

Exception If the argument is invalid or out of range, an Exception will be thrown

See also: setLengthMm(const QString&), toMmString()

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◆ fromInch()

Length fromInch	(	qreal	inches,
		const Length &	gridInterval = `Length(0)`
	)

static

Get a Length object with a specific length and map it to a specific grid.

Parameters

inches	See setLengthInch()
gridInterval	See mapToGrid()

Returns: A new Length object with a length which is mapped to the specified grid

Warning: Please note that this method can decrease the precision of the length! If you need a length which is located exactly on the grid of a QGraphicsView (which is often required), you need to call mapToGrid() afterwards!

Exceptions

RangeError If the argument is out of range, a RangeError exception will be thrown

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◆ fromMil()

Length fromMil	(	qreal	mils,
		const Length &	gridInterval = `Length(0)`
	)

static

Get a Length object with a specific length and map it to a specific grid.

Parameters

mils	See setLengthMil()
gridInterval	See mapToGrid()

Returns: A new Length object with a length which is mapped to the specified grid

Warning: Please note that this method can decrease the precision of the length! If you need a length which is located exactly on the grid of a QGraphicsView (which is often required), you need to call mapToGrid() afterwards!

Exceptions

RangeError If the argument is out of range, a RangeError exception will be thrown

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◆ fromPx()

Length fromPx	(	qreal	pixels,
		const Length &	gridInterval = `Length(0)`
	)

static

Get a Length object with a specific length and map it to a specific grid.

Parameters

pixels	See setLengthPx()
gridInterval	See mapToGrid()

Returns: A new Length object with a length which is mapped to the specified grid

Note: This method is useful to set the length/position of a QGraphics* object.

Warning: Please note that this method can decrease the precision of the length! If you need a length which is located exactly on the grid of a QGraphicsView (which is often required), you need to call mapToGrid() afterwards!

Exceptions

RangeError If the argument is out of range, a RangeError exception will be thrown

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◆ min()

Length min ( )

staticnoexcept

Get the smallest possible length value.

Returns: Smallest possible length

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◆ max()

Length max ( )

staticnoexcept

Get the highest possible length value.

Returns: Highest possible length

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◆ operator=()

Length& operator= ( const Length & rhs )

inline

◆ operator+=()

Length& operator+= ( const Length & rhs )

inline

◆ operator-=()

Length& operator-= ( const Length & rhs )

inline

◆ operator*=() [1/2]

Length& operator*= ( const Length & rhs )

inline

◆ operator*=() [2/2]

Length& operator*= ( LengthBase_t rhs )

inline

◆ operator/=() [1/2]

Length& operator/= ( const Length & rhs )

inline

◆ operator/=() [2/2]

Length& operator/= ( LengthBase_t rhs )

inline

◆ operator+()

Length operator+ ( const Length & rhs ) const

inline

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◆ operator-() [1/2]

Length operator- ( ) const

inline

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◆ operator-() [2/2]

Length operator- ( const Length & rhs ) const

inline

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◆ operator*() [1/2]

Length operator* ( const Length & rhs ) const

inline

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◆ operator*() [2/2]

Length operator* ( LengthBase_t rhs ) const

inline

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◆ operator/() [1/2]

Length operator/ ( const Length & rhs ) const

inline

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◆ operator/() [2/2]

Length operator/ ( LengthBase_t rhs ) const

inline

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◆ operator%()

Length operator% ( const Length & rhs ) const

inline

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◆ operator>() [1/2]

constexpr bool operator> ( const Length & rhs ) const

inline

◆ operator>() [2/2]

constexpr bool operator> ( LengthBase_t rhs ) const

inline

◆ operator<() [1/2]

constexpr bool operator< ( const Length & rhs ) const

inline

◆ operator<() [2/2]

constexpr bool operator< ( LengthBase_t rhs ) const

inline

◆ operator>=() [1/2]

constexpr bool operator>= ( const Length & rhs ) const

inline

◆ operator>=() [2/2]

constexpr bool operator>= ( LengthBase_t rhs ) const

inline

◆ operator<=() [1/2]

constexpr bool operator<= ( const Length & rhs ) const

inline

◆ operator<=() [2/2]

constexpr bool operator<= ( LengthBase_t rhs ) const

inline

◆ operator==() [1/2]

constexpr bool operator== ( const Length & rhs ) const

inline

◆ operator==() [2/2]

constexpr bool operator== ( LengthBase_t rhs ) const

inline

◆ operator!=() [1/2]

constexpr bool operator!= ( const Length & rhs ) const

inline

◆ operator!=() [2/2]

constexpr bool operator!= ( LengthBase_t rhs ) const

inline

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◆ setLengthFromFloat()

void setLengthFromFloat ( qreal nanometers )

private

Set the length from a floating point number in nanometers.

This is a helper method for the setLength*() methods.

Parameters

nanometers A floating point number in nanometers.

Note: The parameter is NOT an integer although we don't use numbers smaller than one nanometer. This way, the range of this parameter is much greater and we can compare the value with the range of an integer. If the value is outside the range of an integer, we will throw an exception. If we would pass the length as an integer, we couldn't detect such under-/overflows!

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◆ checkRange()

bool checkRange	(	qreal	nanometers,
		bool	doThrow = `false`
	)

staticprivate

Check if a float value in nanometers is in the allowed range.

Parameters

nanometers	The value to check
doThrow	If true, throw a librepcb::RangeError if out of range instead of returning the result

Return values

true	Value is valid, can construct a Length from it.
false	Value is invalid, constructing a Length would throw.

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◆ mapNmToGrid()

LengthBase_t mapNmToGrid	(	LengthBase_t	nanometers,
		const Length &	gridInterval
	)

staticprivatenoexcept

Map a length in nanometers to a grid interval in nanometers.

This is a helper function for mapToGrid().

Parameters

nanometers	The length we want to map to the grid
gridInterval	The grid interval

Returns: The length which is mapped to the grid (always a multiple of gridInterval)

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◆ mmStringToNm()

LengthBase_t mmStringToNm ( const QString & millimeters )

staticprivate

Convert a length from a QString (in millimeters) to an integer (in nanometers)

This is a helper function for Length(const QString&) and setLengthMm().

Parameters

millimeters A QString which contains a floating point number with maximum six decimals after the decimal point. The locale of the string have to be "C"! Example: QString("-1234.56") for -1234.56mm

Returns: The length in nanometers

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Member Data Documentation

◆ mNanometers

LengthBase_t mNanometers

private

the length in nanometers

◆ sNmPerInch

constexpr LengthBase_t sNmPerInch = 25400000

staticprivate

1 inch = 25.4mm

◆ sNmPerMil

constexpr LengthBase_t sNmPerMil = 25400

staticprivate

1 inch = 25.4mm

◆ sPixelsPerInch

constexpr LengthBase_t sPixelsPerInch

staticprivate

Initial value:

=

72

72 dpi for the QGraphics* objects

◆ sNmPerPixel

constexpr qreal sNmPerPixel = (qreal)sNmPerInch / sPixelsPerInch

staticprivate

◆ sPixelsPerNm

constexpr qreal sPixelsPerNm = (qreal)sPixelsPerInch / sNmPerInch

staticprivate

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

/__w/1/s/libs/librepcb/core/types/length.h
/__w/1/s/libs/librepcb/core/types/length.cpp

Public Member Functions

Static Public Member Functions

Private Member Functions

Static Private Member Functions

Private Attributes

Static Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ Length() [1/3]

◆ Length() [2/3]

◆ Length() [3/3]

◆ ~Length()

Member Function Documentation

◆ setLengthNm()

◆ setLengthMm() [1/2]

◆ setLengthMm() [2/2]

◆ setLengthInch()

◆ setLengthMil()

◆ setLengthPx()

◆ toNm()

◆ toNmString()

◆ toMicrometers()

◆ toMm()

◆ toMmString()

◆ toInch()

◆ toMil()

◆ toPx()

◆ abs()

◆ makeAbs()

◆ mappedToGrid()

◆ mapToGrid()

◆ scaled()

◆ scale()

◆ isValidMm()

◆ fromMm() [1/2]

◆ fromMm() [2/2]

◆ fromInch()

◆ fromMil()

◆ fromPx()

◆ min()

◆ max()

◆ operator=()

◆ operator+=()

◆ operator-=()

◆ operator*=() [1/2]

◆ operator*=() [2/2]

◆ operator/=() [1/2]

◆ operator/=() [2/2]

◆ operator+()

◆ operator-() [1/2]

◆ operator-() [2/2]

◆ operator*() [1/2]

◆ operator*() [2/2]

◆ operator/() [1/2]

◆ operator/() [2/2]

◆ operator%()

◆ operator>() [1/2]

◆ operator>() [2/2]

◆ operator<() [1/2]

◆ operator<() [2/2]

◆ operator>=() [1/2]

◆ operator>=() [2/2]

◆ operator<=() [1/2]

◆ operator<=() [2/2]

◆ operator==() [1/2]

◆ operator==() [2/2]

◆ operator!=() [1/2]

◆ operator!=() [2/2]

◆ setLengthFromFloat()

◆ checkRange()

◆ mapNmToGrid()

◆ mmStringToNm()

Member Data Documentation

◆ mNanometers

◆ sNmPerInch

◆ sNmPerMil

◆ sPixelsPerInch

◆ sNmPerPixel

◆ sPixelsPerNm