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The header file provides various math functions. More. Adobe lightroom classic cc 8 3 1.
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Functions
| qreal | qAcos(qreal v) |
| qreal | qAsin(qreal v) |
| qreal | qAtan2(qreal y, qreal x) |
| qreal | qAtan(qreal v) |
| int | qCeil(qreal v) |
| qreal | qCos(qreal v) |
| float | qDegreesToRadians(float degrees) |
| double | qDegreesToRadians(double degrees) |
| qreal | qExp(qreal v) |
| qreal | qFabs(qreal v) |
| int | qFloor(qreal v) |
| qreal | qLn(qreal v) |
| quint32 | qNextPowerOfTwo(quint32 value) |
| quint64 | qNextPowerOfTwo(quint64 value) |
| quint32 | qNextPowerOfTwo(qint32 value) |
| quint64 | qNextPowerOfTwo(qint64 value) |
| qreal | qPow(qreal x, qreal y) |
| float | qRadiansToDegrees(float radians) |
| double | qRadiansToDegrees(double radians) |
| qreal | qSin(qreal v) |
| qreal | qSqrt(qreal v) |
| qreal | qTan(qreal v) |
Detailed Description
These functions are partly convenience definitions for basic math operations not available in the C or Standard Template Libraries.
The header also ensures some constants specified in POSIX, but not present in C++ standards (so absent from on some platforms), are defined:
| Constant | Description |
|---|---|
M_E | The base of the natural logarithms, e = exp(1) |
M_LOG2E | The base-two logarithm of e |
M_LOG10E | The base-ten logarithm of e |
M_LN2 | The natural logarithm of two |
M_LN10 | The natural logarithm of ten |
M_PI | The ratio of a circle's circumference to diameter, π |
M_PI_2 | Half M_PI, π / 2 |
M_PI_4 | Quarter M_PI, π / 4 |
M_1_PI | The inverse of M_PI, 1 / π |
M_2_PI | Twice the inverse of M_PI, 2 / π |
M_2_SQRTPI | Two divided by the square root of pi, 2 / √π |
M_SQRT2 | The square root of two, √2 |
M_SQRT1_2 | The square roof of half, 1 / √2 |
Function Documentation
qrealqAcos(qrealv)
Returns the arccosine of v as an angle in radians. Arccosine is the inverse operation of cosine.
See also qAtan(), qAsin(), and qCos().
qrealqAsin(qrealv)
Returns the arcsine of v as an angle in radians. Arcsine is the inverse operation of sine.
See also qSin(), qAtan(), and qAcos().
qrealqAtan2(qrealy, qrealx)
Returns the arctangent of a point specified by the coordinates y and x. This function will return the angle (argument) of that point.
See also qAtan().
qrealqAtan(qrealv)
Returns the arctangent of v as an angle in radians. Arctangent is the inverse operation of tangent.
See also qTan(), qAcos(), and qAsin().
intqCeil(qrealv)
Directv app for macbook. Return the ceiling of the value v.
The ceiling is the smallest integer that is not less than v. For example, if v is 41.2, then the ceiling is 42.
See also qFloor(). Design letters templates 1 6 – templates for pages printables.
qrealqCos(qrealv)
Returns the cosine of an angle v in radians.
See also qSin() and qTan().
floatqDegreesToRadians(floatdegrees)
This function converts the degrees in float to radians.
Example:
This function was introduced in Qt 5.1.
See also qRadiansToDegrees().
doubleqDegreesToRadians(doubledegrees)
This function converts the degrees in double to radians.
Example:
This function was introduced in Qt 5.1.
See also qRadiansToDegrees().
qrealqExp(qrealv)
Returns the exponential function of e to the power of v.
See also qLn().
qrealqFabs(qrealv)
Returns the absolute value of v as a qreal.
intqFloor(qrealv)
Return the floor of the value v.
The floor is the largest integer that is not greater than v. For example, if v is 41.2, then the floor is 41.
See also qCeil().
qrealqLn(qrealv)
Returns the natural logarithm of v. Natural logarithm uses base e.
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See also qExp().
quint32qNextPowerOfTwo(quint32value)
This function returns the nearest power of two greater than value. For 0 it returns 1, and for values larger than or equal to 2^31 it returns 0.
This function was introduced in Qt 5.4.
quint64qNextPowerOfTwo(quint64value)
This function returns the nearest power of two greater than value. For 0 it returns 1, and for values larger than or equal to 2^63 it returns 0.
This function was introduced in Qt 5.4.
quint32qNextPowerOfTwo(qint32value)
This is an overloaded function.
This function returns the nearest power of two greater than value. For negative values it returns 0.
This function was introduced in Qt 5.4.
quint64qNextPowerOfTwo(qint64value)
This is an overloaded function.
This function returns the nearest power of two greater than value. For negative values it returns 0.
This function was introduced in Qt 5.4.
qrealqPow(qrealx, qrealy)
Returns the value of x raised to the power of y. That is, x is the base and y is the exponent.
See also qSqrt().
floatqRadiansToDegrees(floatradians)
This function converts the radians in float to degrees.
Example:
This function was introduced in Qt 5.1.
See also qDegreesToRadians().
doubleqRadiansToDegrees(doubleradians)
This function converts the radians in double to degrees.
Example:
This function was introduced in Qt 5.1.
See also qDegreesToRadians().
doubleqDegreesToRadians(doubledegrees)
This function converts the degrees in double to radians.
Example:
This function was introduced in Qt 5.1.
See also qRadiansToDegrees().
qrealqExp(qrealv)
Returns the exponential function of e to the power of v.
See also qLn().
qrealqFabs(qrealv)
Returns the absolute value of v as a qreal.
intqFloor(qrealv)
Return the floor of the value v.
The floor is the largest integer that is not greater than v. For example, if v is 41.2, then the floor is 41.
See also qCeil().
qrealqLn(qrealv)
Returns the natural logarithm of v. Natural logarithm uses base e.
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See also qExp().
quint32qNextPowerOfTwo(quint32value)
This function returns the nearest power of two greater than value. For 0 it returns 1, and for values larger than or equal to 2^31 it returns 0.
This function was introduced in Qt 5.4.
quint64qNextPowerOfTwo(quint64value)
This function returns the nearest power of two greater than value. For 0 it returns 1, and for values larger than or equal to 2^63 it returns 0.
This function was introduced in Qt 5.4.
quint32qNextPowerOfTwo(qint32value)
This is an overloaded function.
This function returns the nearest power of two greater than value. For negative values it returns 0.
This function was introduced in Qt 5.4.
quint64qNextPowerOfTwo(qint64value)
This is an overloaded function.
This function returns the nearest power of two greater than value. For negative values it returns 0.
This function was introduced in Qt 5.4.
qrealqPow(qrealx, qrealy)
Returns the value of x raised to the power of y. That is, x is the base and y is the exponent.
See also qSqrt().
floatqRadiansToDegrees(floatradians)
This function converts the radians in float to degrees.
Example:
This function was introduced in Qt 5.1.
See also qDegreesToRadians().
doubleqRadiansToDegrees(doubleradians)
This function converts the radians in double to degrees.
Example:
This function was introduced in Qt 5.1.
See also qDegreesToRadians().
qrealqSin(qrealv)
Returns the sine of the angle v in radians.
See also qCos() and qTan().
qrealqSqrt(qrealv)
Returns the square root of v. This function returns a NaN if v is a negative number.
See also qPow().
qrealqTan(qrealv)
Returns the tangent of an angle v in radians.
See also qSin() and qCos().
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