Q15

touchgfx/widgets/canvas/CWRUtil.hpp

Defines a "floating point number" with 15 bits reserved for the fractional part of the decimal number. Q15 is only used for sine/cosine and for intermediate calculations when multiplying.

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

See: Q5, Q10

Public Functions

	operator int() const
	Gets the Q15 as an integer without conversion.
Q15	operator+(const Q15 & q15) const
	Addition operator.
Q15	operator-() const
	Negation operator.
Q10	operator/(const Q5 & q5) const
	Calculate Q15 / Q5 as a Q10.
	Q15(int i)
	Constructor from integer.

Public Functions Documentation

operator int

operator int	(			)	const

Gets the Q15 as an integer without conversion.

Returns:

The unconverted Q15 value.

operator+

Q15 operator+	(	const Q15 &	q15	)

Addition operator.

Parameters:

q15	The Q15 to add to this.

Returns:

The result of the operation.

operator-

Q15 operator-	(			)	const

Negation operator.

Returns:

The negative value of this.

operator/

Q10 operator/	(	const Q5 &	q5	)

Calculate Q15 / Q5 as a Q10.

Parameters:

q5	The Q5 to divide this by.

Returns:

The result of the operation.

Q15

explicit Q15	(	int	i	)

Constructor from integer.

No conversion is done - the integer is assumed to already be in Q15 format.

Parameters:

i	int pre-formattet in Q15 format.