gv_math.h File Reference

Arithmetic helper functions. More...

#include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <string.h>

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Functions
static int	fcmp (double a, double b)
	comparator for doubles
static int	imax (int a, int b)
	maximum of two integers
static int	imin (int a, int b)
	minimum of two integers
static bool	is_exactly_equal (double a, double b)
	are two values precisely the same?
static bool	is_exactly_zero (double v)
	is a value precisely 0.0?
static int	scale_clamp (int original, double scale)
	scale up or down a non-negative integer, clamping to [0, INT_MAX]

Function Documentation

fcmp()

static int fcmp ( double  a, double  b  )

inlinestatic

Definition at line 13 of file gv_math.h.

Referenced by countHorzCross(), and countVertCross().

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imax()

static int imax ( int  a, int  b  )

inlinestatic

Definition at line 24 of file gv_math.h.

Referenced by agerr_va().

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imin()

static int imin ( int  a, int  b  )

inlinestatic

Definition at line 27 of file gv_math.h.

Referenced by common_init_node(), dfs(), dfs(), make_map_internal(), node_distinct_coloring_internal2(), QuadTree_get_nearest(), QuadTree_get_nearest_internal(), and sfprint().

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is_exactly_equal()

static bool is_exactly_equal ( double  a, double  b  )

inlinestatic

This function should only be used when you know you want comparison with no tolerance, which is rare. Floating-point arithmetic accumulates imprecision, so equality comparisons should generally include a non-zero tolerance to account for this. In general, this function is only applicable for checking things like “is this variable unchanged since a previous assignment from a literal?”

Parameters

a	First operand to comparison
b	Second operand to comparison

Returns

True if the values are equal

Definition at line 43 of file gv_math.h.

Referenced by is_exactly_zero(), is_set(), point_init(), poly_init(), rgb2hsv(), and routesplines_().

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is_exactly_zero()

static bool is_exactly_zero ( double  v )

inlinestatic

This function should only be used when you know you want comparison with no tolerance, which is rare. Floating-point arithmetic accumulates imprecision, so equality comparisons should generally include a non-zero tolerance to account for this. Valid double representations even include -0.0, for which this function will return false. In general, this function is only applicable for checking things like “is this variable unchanged since a previous assignment from the literal 0?” or “did this value we parsed from user input originate from the string "0.0"?”

Parameters

v	Value to check

Returns

True if the value is equal to exactly 0.0

Definition at line 62 of file gv_math.h.

References is_exactly_equal().

Referenced by dotneato_args_initialize(), emit_begin_node(), get_inputscale(), isBox(), isRect(), poly_init(), and poly_inside().

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scale_clamp()

static int scale_clamp ( int  original, double  scale  )

inlinestatic

Parameters

original	Value to scale
scale	Scale factor to apply

Returns

Clamped result

Definition at line 71 of file gv_math.h.

References scale().

Referenced by dot2_rank(), nsiter2(), and rank1().

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