WebSVN – gelsvn – Diff – /trunk/src/CGLA/CGLA.h


#ifndef __CGLA_H
#define __CGLA_H
 
#ifndef OLD_C_HEADERS
#include <cmath>
#include <climits>
#include <cassert>
#else
#include <math.h>
#include <limits.h>
#include <assert.h>
#endif
 
#include <algorithm>
 
#ifndef M_PI
#define M_PI 3.14159265358979323846
#define M_PI_2 1.57079632679489661923
#endif
 
namespace CGLA {
 
	/** Numerical constant representing something large.
			value is a bit arbitrary */
	const double BIG=10e+30;
 
	/** Numerical constant represents something extremely small.
			value is a bit arbitrary */
	const double MINUTE=10e-30;
 
	/** Numerical constant represents something very small.
			value is a bit arbitrary */
	const double TINY=3e-7;
	
	/** Numerical constant represents something small.
			value is a bit arbitrary */
	const double SMALL=10e-2;
 
	const double SQRT3=sqrt(3.0);
 
	/// Useful enum that represents coordiante axes.
	enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};
 
	template<class Scalar>
	Scalar s_min(Scalar a, Scalar b)
	{
		return a<b ? a : b;
	}
 
	template<class Scalar>
	Scalar s_max(Scalar a, Scalar b)
	{
		return a>b ? a : b;
	}
 
	///Template for a function that squares the argument.
	template <class Scalar>
	inline Scalar sqr(Scalar x) {///
		return x*x;}
	
	/// Scalaremplate for a function that returns the cube of the argument.
	template <class Scalar>
	inline Scalar qbe(Scalar x) {///
		return x*x*x;}
 
	template <class Scalar>
	inline bool is_zero(Scalar x)	{return (x > -MINUTE && x < MINUTE);}
 
	template <class Scalar>
	inline bool is_tiny(Scalar x)	{return (x > -TINY && x < TINY);}
 
	/** What power of 2 ?. if x is the argument, find the largest 
			y so that 2^y <= x */
	inline int two_to_what_power(int x) 
	{
		if (x<1) 
			return -1;
		int i = 0;
		while (x != 1) {x>>=1;i++;}
		return i;
	}
 
#ifdef __sgi
	inline int round(float x) {return int(rint(x));}
#else
	inline int round(float x) {return int(x+0.5);}
#endif
 
	template<class T>
	inline T sign(T x) {return x>=T(0) ? 1 : -1;}
 
 
	template<class T>
	inline T int_pow(T x, int k) 
	{
		T y = static_cast<T>(1);
		for(int i=0;i<k;++i)
			y *= x;
		return y;
	}
 
	
}
 
#endif
 

Rev 2	Rev 5
1	`#ifndef __CGLA_H`	1	`#ifndef __CGLA_H`
2	`#define __CGLA_H`	2	`#define __CGLA_H`
3		3
4	`#ifndef OLD_C_HEADERS`	4	`#ifndef OLD_C_HEADERS`
5	`#include <cmath>`	5	`#include <cmath>`
6	`#include <climits>`	6	`#include <climits>`
7	`#include <cassert>`	7	`#include <cassert>`
8	`#else`	8	`#else`
9	`#include <math.h>`	9	`#include <math.h>`
10	`#include <limits.h>`	10	`#include <limits.h>`
11	`#include <assert.h>`	11	`#include <assert.h>`
12	`#endif`	12	`#endif`
13		13
14	`#include <algorithm>`	14	`#include <algorithm>`
15		15
16	`#ifndef M_PI`	16	`#ifndef M_PI`
17	`#define M_PI 3.14159265358979323846`	17	`#define M_PI 3.14159265358979323846`
18	`#define M_PI_2 1.57079632679489661923`	18	`#define M_PI_2 1.57079632679489661923`
19	`#endif`	19	`#endif`
20		20
21	`namespace CGLA {`	21	`namespace CGLA {`
22		22
23	`/** Numerical constant representing something large.`	23	`/** Numerical constant representing something large.`
24	`value is a bit arbitrary */`	24	`value is a bit arbitrary */`
25	`const float BIG=10e+30f;`	25	`const double BIG=10e+30;`
26		26
27	`/** Numerical constant represents something extremely small.`	27	`/** Numerical constant represents something extremely small.`
28	`value is a bit arbitrary */`	28	`value is a bit arbitrary */`
29	`const float MINUTE=10e-30f;`	29	`const double MINUTE=10e-30;`
30		30
31	`/** Numerical constant represents something very small.`	31	`/** Numerical constant represents something very small.`
32	`value is a bit arbitrary */`	32	`value is a bit arbitrary */`
33	`const float TINY=3e-7f;`	33	`const double TINY=3e-7;`
34		34
35	`/** Numerical constant represents something small.`	35	`/** Numerical constant represents something small.`
36	`value is a bit arbitrary */`	36	`value is a bit arbitrary */`
37	`const float SMALL=10e-2f;`	37	`const double SMALL=10e-2;`
38		38
39	`const float SQRT3=sqrt(3.0f);`	39	`const double SQRT3=sqrt(3.0);`
40		40
41	`/// Useful enum that represents coordiante axes.`	41	`/// Useful enum that represents coordiante axes.`
42	`enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};`	42	`enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};`
43		43
44	`template<class Scalar>`	44	`template<class Scalar>`
45	`Scalar s_min(Scalar a, Scalar b)`	45	`Scalar s_min(Scalar a, Scalar b)`
46	`{`	46	`{`
47	`return a<b ? a : b;`	47	`return a<b ? a : b;`
48	`}`	48	`}`
49		49
50	`template<class Scalar>`	50	`template<class Scalar>`
51	`Scalar s_max(Scalar a, Scalar b)`	51	`Scalar s_max(Scalar a, Scalar b)`
52	`{`	52	`{`
53	`return a>b ? a : b;`	53	`return a>b ? a : b;`
54	`}`	54	`}`
55		55
56	`///Template for a function that squares the argument.`	56	`///Template for a function that squares the argument.`
57	`template <class Scalar>`	57	`template <class Scalar>`
58	`inline Scalar sqr(Scalar x) {///`	58	`inline Scalar sqr(Scalar x) {///`
59	`return x*x;}`	59	`return x*x;}`
60		60
61	`/// Scalaremplate for a function that returns the cube of the argument.`	61	`/// Scalaremplate for a function that returns the cube of the argument.`
62	`template <class Scalar>`	62	`template <class Scalar>`
63	`inline Scalar qbe(Scalar x) {///`	63	`inline Scalar qbe(Scalar x) {///`
64	`return xxx;}`	64	`return xxx;}`
65		65
66	`template <class Scalar>`	66	`template <class Scalar>`
67	`inline bool is_zero(Scalar x) {return (x > -MINUTE && x < MINUTE);}`	67	`inline bool is_zero(Scalar x) {return (x > -MINUTE && x < MINUTE);}`
68		68
69	`template <class Scalar>`	69	`template <class Scalar>`
70	`inline bool is_tiny(Scalar x) {return (x > -TINY && x < TINY);}`	70	`inline bool is_tiny(Scalar x) {return (x > -TINY && x < TINY);}`
71		71
72	`/** What power of 2 ?. if x is the argument, find the largest`	72	`/** What power of 2 ?. if x is the argument, find the largest`
73	`y so that 2^y <= x */`	73	`y so that 2^y <= x */`
74	`inline int two_to_what_power(int x)`	74	`inline int two_to_what_power(int x)`
75	`{`	75	`{`
76	`if (x<1)`	76	`if (x<1)`
77	`return -1;`	77	`return -1;`
78	`int i = 0;`	78	`int i = 0;`
79	`while (x != 1) {x>>=1;i++;}`	79	`while (x != 1) {x>>=1;i++;}`
80	`return i;`	80	`return i;`
81	`}`	81	`}`
82		82
83	`#ifdef __sgi`	83	`#ifdef __sgi`
84	`inline int round(float x) {return int(rint(x));}`	84	`inline int round(float x) {return int(rint(x));}`
85	`#else`	85	`#else`
86	`inline int round(float x) {return int(x+0.5);}`	86	`inline int round(float x) {return int(x+0.5);}`
87	`#endif`	87	`#endif`
88		88
89	`template<class T>`	89	`template<class T>`
90	`inline T sign(T x) {return x>=T(0) ? 1 : -1;}`	90	`inline T sign(T x) {return x>=T(0) ? 1 : -1;}`
91		91
92		92
93	`template<class T>`	93	`template<class T>`
94	`inline T int_pow(T x, int k)`	94	`inline T int_pow(T x, int k)`
95	`{`	95	`{`
96	`T y = static_cast<T>(1);`	96	`T y = static_cast<T>(1);`
97	`for(int i=0;i<k;++i)`	97	`for(int i=0;i<k;++i)`
98	`y *= x;`	98	`y *= x;`
99	`return y;`	99	`return y;`
100	`}`	100	`}`
101		101
102		102
103	`}`	103	`}`
104		104
105	`#endif`	105	`#endif`
106		106

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(root)/trunk/src/CGLA/CGLA.h – Rev 2 → 5