Q10

touchgfx/widgets/canvas/CWRUtil.hpp

Defines a "floating point number" with 10 bits reserved for the fractional part of the decimal number. Q10 implements some simple arithmetic operations, most yielding a Q10 number and some yielding a Q5 number or a Q15 number as a result.

Q5*Q5=Q10, Q10/Q5=Q5, ...

See: Q5, Q15

Public Functions

	operator int() const
	Gets the Q10 as an integer without conversion.
Q15	operator*(const Q5 & q5) const
	Multiplication operator.
Q10	operator+(const Q10 & q10) const
	Addition operator.
Q10	operator-() const
	Negation operator.
Q5	operator/(const Q5 & q5) const
	Division operator.
	Q10()
	Initializes a new instance of the Q10 class.
	Q10(int i)
	Constructor from integer.
template <typename T > T	to() const
	Converts the Q10 value to an int or a float.

Public Functions Documentation

operator int

operator int	(			)	const

Gets the Q10 as an integer without conversion.

Returns:

The unconverted Q10 value.

operator*

Q15 operator*	(	const Q5 &	q5	)

Multiplication operator.

The result is a Q15, not a Q10, for increased precision.

Parameters:

q5	The Q5 to multiply this with.

Returns:

The result of the operation.

operator+

Q10 operator+	(	const Q10 &	q10	)

Addition operator.

Parameters:

q10	The Q10 to add to this.

Returns:

The result of the operation.

operator-

Q10 operator-	(			)	const

Negation operator.

Returns:

The negative value of this.

operator/

Q5 operator/	(	const Q5 &	q5	)

Division operator.

Parameters:

q5	The Q5 to divide this by.

Returns:

The result of the operation.

Q10

Q10	(			)

Initializes a new instance of the Q10 class.

Q10

explicit Q10	(	int	i	)

Constructor from integer.

No conversion is done - the integer is assumed to already be in Q10 format.

Parameters:

i	int pre-formattet in Q10 format.

to

T to	(			)	const

Converts the Q10 value to an int or a float.

Convert the Q10 value to an integer by removing the 10 bits used for the fraction, or to a floating point value by dividing by 32 * 32, depending on the type specified as T.

Template Parameters:

T	Either int or float.

Returns:

Q10 value as a type T.