kis_fast_math.cpp File Reference

#include "kis_fast_math.h"
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <QtGlobal>
#include <QGlobalStatic>

Go to the source code of this file.

Classes
struct	KisATanTable

Functions
qreal	calcAngle (qreal x, qreal y)
qreal	interp (qreal r, qreal a, qreal b)
	private functions

Variables
const qreal	MAX_ERROR = 0.0001
	precision
const qreal	MAX_SECOND_DERIV_IN_RANGE = 0.6495

Function Documentation

calcAngle()

qreal calcAngle ( qreal x, qreal y )

inline

Definition at line 57 of file kis_fast_math.cpp.

{
    static qreal af = kisATanTable->NUM_ATAN_ENTRIES;
    static int ai = kisATanTable->NUM_ATAN_ENTRIES;
    static qreal* ATanTable = kisATanTable->ATanTable;
    qreal di = (y / x) * af;
    int i = (int)(di);
    if (i >= ai) return ::atan2(y, x);
    return interp(di - i, ATanTable[i], ATanTable[i+1]);
}

References interp().

interp()

qreal interp ( qreal r, qreal a, qreal b )

inline

private functions

Definition at line 52 of file kis_fast_math.cpp.

{
    return r*(b - a) + a;
}

Variable Documentation

MAX_ERROR

const qreal MAX_ERROR = 0.0001

precision

Definition at line 21 of file kis_fast_math.cpp.

MAX_SECOND_DERIV_IN_RANGE

const qreal MAX_SECOND_DERIV_IN_RANGE = 0.6495

Definition at line 18 of file kis_fast_math.cpp.