Tolerances of 2D-constraint solving and other constants. More...

#include <gce_precision.h>

Collaboration diagram for GcPrecision:

Tolerances
static const double	m_null
	Absolute tolerance with which the clear zero is determined in matrix.

static const double	grshTol
	Relative tolerance for estimation of linear dependence during orthogonalizaiton (Gram-Schmidt).

static const double	grshEpsilon
	Relative tolerance for strengthened estimation of linear dependence (Gram-Schmidt).

static const double	tolerance
	Tolerance for checking a real number (angular or metric) for zero.

static const double	degMetricEps
	Metric tolerance for checking the geometry for degeneracy.

static const double	lengthEpsilon
	Computational tolerance of iterative solvers in the length units.

static const double	angleEpsilon
	Angular tolerance in radians for iterative computation.

static const double	lengthRegion
	Indistinguishable metric domain (satisfactory tolerance).

static const double	angleRegion
	Indistinguishable angular domain (satisfactory tolerance).

static const double	newtonEpsilon
	Target accuracy of the iterative solution result.

static const double	newtonRegion
	Satisfactory accuracy of the iterative solution.

static const double	paramRegion
	Parameter checking tolerance.

static const double	maxRadius
	Maximal possible radius to deal with a circle in 2d-sketch.

static const MbGeomTol	satisfying
	Satisfactory tolerance.

static const MbGeomTol	newtonTol
	Tolerance of solving the equation system by iterative methods.

Other constants
static const double	pi2
	2*M_PI (6.18...)

static const double	lastReal
	"The greatest" float number.

static const int	iterLimitCount
	Limit of iterations in numerical Newton's method.

static const int	wellIterLimit
	Limit number of iterations in well-convergent processes.

static TCHAR	buff_512 [512]
	Text buffer of 512 bytes.

Detailed Description

Tolerances of 2D-constraint solving and other constants.

The class encapsulates all tolerances and other constants related to two-dimensional constraint solving.

For check of distance values or points coincidence in 2D space tolerance GcPrecision::lengthRegion is used. I.e. any two points which are not coincident with tolerance GcPrecision::lengthRegion are considered to be different.
For iterative solvers tolerance of parameter GcPrecision::newtonEpsilon is used. This value is 1-2 orders higher than undistinguishable domain (lengthRegion, angleRegion).
Any angular, length or parametric value less than GcPrecision::tolerance is considered to be zero.
Value newtonEpsilon is always less or equal to (lengthEpsilon, angleEpsilon).
Any element of matrix less than GcPrecision::m_null by absolute value is considered to be zero.

The documentation for this struct was generated from the following file:

Tolerances