Documentation
¶
Index ¶
- Constants
- Variables
- func Signum(x float64) int
- type PairFloat
- func (d *PairFloat) CompareTo(other *PairFloat) int
- func (d *PairFloat) Equals(y *PairFloat) bool
- func (d *PairFloat) Ge(y *PairFloat) bool
- func (d *PairFloat) Gt(y *PairFloat) bool
- func (d *PairFloat) IsZero() bool
- func (d *PairFloat) Le(y *PairFloat) bool
- func (d *PairFloat) Lt(y *PairFloat) bool
- func (d *PairFloat) SelfAdd(yhi, ylo float64) *PairFloat
- func (d *PairFloat) SelfAddOne(y float64) *PairFloat
- func (d *PairFloat) SelfDivide(yhi, ylo float64) *PairFloat
- func (d *PairFloat) SelfMultiply(yhi, ylo float64) *PairFloat
- func (d *PairFloat) SelfMultiplyPair(y *PairFloat) *PairFloat
- func (d *PairFloat) SelfSubtract(yhi, ylo float64) *PairFloat
- func (d *PairFloat) Signum() int
Constants ¶
const ( // OffsetSegmentSeparationFactor Factor which controls how close offset segments can be to // skip adding a filler or mitre. OffsetSegmentSeparationFactor = 1.0e-3 // InsideTurnVertexSnapDistanceFactor Factor which controls how close curve vertices on inside turns can be to be snapped InsideTurnVertexSnapDistanceFactor = 1.0e-3 // CurveVertexSnapDistanceFactor Factor which controls how close curve vertices can be to be snapped CurveVertexSnapDistanceFactor = 1.0e-6 // MaxClosingSegLenFactor Factor which determines how short closing segs can be for round buffers MaxClosingSegLenFactor = 80 )
const ( // DegreeRad is coefficient to translate from degrees to radians DegreeRad = math.Pi / 180.0 // EarthR is earth radius in km EarthR = 6371.0 // Angle of sin 60 = 0.866025403785 Sin60 = 0.866025403785 Cos60 = 0.5 )
const ...
const ( // POINTS ... POINTS = iota // CLOSED edge is closed. CLOSED // MAIN overlay main polygon. MAIN // CUT overlay cut polygon. CUT // CLIP overlay clip. CLIP // MERGE overlay merge. MERGE )
const overlay parameters.
const ( // CLOCKWISE ... CLOCKWISE = -1 COUNTERCLOCKWISE = 1 // ANGLE ... ANGLE = 2.0 LEFT = 1 RIGHT = 2 // MinRingSize ... MinRingSize = 3 // MaxRingSize ... MaxRingSize = 9 // NearnessFactor ... NearnessFactor = 0.99 // CAPROUND Specifies a round line buffer end cap style. CAPROUND = 1 // CAPFLAT Specifies a flat line buffer end cap style. CAPFLAT = 2 // CAPSQUARE Specifies a square line buffer end cap style. CAPSQUARE = 3 //JOINROUND Specifies a round join style. JOINROUND = 1 // JOINMITRE Specifies a mitre join style. JOINMITRE = 2 // JOINBEVEL Specifies a bevel join style. JOINBEVEL = 3 // QUADRANTSEGMENTS The default number of facets into which to divide a fillet of 90 degrees. // A value of 8 gives less than 2% max error in the buffer distance. // For a max error of < 1%, use QS = 12. // For a max error of < 0.1%, use QS = 18. QUADRANTSEGMENTS = 8 // MITRELIMIT // The default mitre limit // Allows fairly pointy mitres. MITRELIMIT = 5.0 // SIMPLIFYFACTOR // The default simplify factor // Provides an accuracy of about 1%, which matches the accuracy of the default Quadrant Segments parameter. SIMPLIFYFACTOR = 0.01 )
const default parameters.
const ( // The location value for the exterior of a geometry. // Also, DE-9IM row index of the exterior of the first geometry and column index INTERIOR = 0 BOUNDARY = 1 EXTERIOR = 2 // FALSE Dimension value of the empty geometry (-1). // TRUE Dimension value of non-empty geometries (= {P, L, A}). // DONTCARE Dimension value for any dimension (= {FALSE, TRUE}). FALSE = -1 TRUE = -2 DONTCARE = -3 P = 0 L = 1 A = 2 SYMFALSE = 'F' SYMTRUE = 'T' SYMDONTCARE = '*' SYMP = '0' SYML = '1' SYMA = '2' )
const default DE-9IM and Dimension parameters.
const ( // The smallest representable relative difference between two values. EPS = 1.23259516440783e-32 // = 2^-106 SPLIT = 134217729.0 // 2^27+1, for IEEE MAXPRINTDIGITS = 32 SCINOTEXPONENTCHAR = "E" SCINOTZERO = "0.0E0" )
const calc parameter
Variables ¶
var ( // PI The value nearest to the constant Pi. PI = &PairFloat{3.141592653589793116e+00, 1.224646799147353207e-16} // TWOPI The value nearest to the constant 2 * Pi. TWOPI = &PairFloat{ 6.283185307179586232e+00, 2.449293598294706414e-16} // PI2 The value nearest to the constant Pi / 2. PI2 = &PairFloat{ 1.570796326794896558e+00, 6.123233995736766036e-17} //E The value nearest to the constant e (the natural logarithm base). E = &PairFloat{ 2.718281828459045091e+00, 1.445646891729250158e-16} )
Functions ¶
Types ¶
type PairFloat ¶
type PairFloat struct {
Hi, Lo float64
}
PairFloat A DoubleDouble uses a representation containing two double-precision values. A number x is represented as a pair of doubles, x.hi and x.lo
func (*PairFloat) SelfAdd ¶
SelfAdd Adds the argument to the value of DD. To prevent altering constants, this method must only be used on values known to be newly created.
func (*PairFloat) SelfAddOne ¶
SelfAddOne Adds the argument to the value of DD. To prevent altering constants, this method must only be used on values known to be newly created.
func (*PairFloat) SelfDivide ¶
SelfDivide Divides this object by the argument, returning DD. To prevent altering constants, this method must only be used on values known to be newly created.
func (*PairFloat) SelfMultiply ¶
SelfMultiply Multiplies this object by the argument, returning DD. To prevent altering constants, this method must only be used on values known to be newly created.
func (*PairFloat) SelfMultiplyPair ¶
SelfMultiplyPair Multiplies this object by the argument, returning DD. To prevent altering constants, this method must only be used on values known to be newly created.
func (*PairFloat) SelfSubtract ¶
SelfSubtract Subtracts the argument from the value of DD. To prevent altering constants, this method must only be used on values known to be newly created.
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