1 // Copyright (c) 1999-2014 OPEN CASCADE SAS
3 // This file is part of Open CASCADE Technology software library.
5 // This library is free software; you can redistribute it and/or modify it under
6 // the terms of the GNU Lesser General Public License version 2.1 as published
7 // by the Free Software Foundation, with special exception defined in the file
8 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
9 // distribution for complete text of the license and disclaimer of any warranty.
11 // Alternatively, this file may be used under the terms of Open CASCADE
12 // commercial license or contractual agreement.
14 // Modified 23/02/98 : FMN ; Remplacement PI par Standard_PI
16 #include <Aspect_CircularGrid.ixx>
17 #include <Aspect_Grid.hxx>
18 #include <Standard_NumericError.hxx>
19 Aspect_CircularGrid::Aspect_CircularGrid
20 (const Quantity_Length aRadiusStep,
21 const Standard_Integer aDivisionNumber,
22 const Quantity_Length anXOrigin,
23 const Quantity_Length anYOrigin,
24 const Quantity_PlaneAngle aRotationAngle)
25 :Aspect_Grid(anXOrigin,anYOrigin,aRotationAngle),myRadiusStep(aRadiusStep),
26 myDivisionNumber(aDivisionNumber) {
29 void Aspect_CircularGrid::SetRadiusStep(const Standard_Real aRadiusStep) {
30 Standard_NegativeValue_Raise_if(aRadiusStep < 0., "invalid radius step");
31 Standard_NullValue_Raise_if(aRadiusStep == 0. , "invalid radius step");
32 myRadiusStep= aRadiusStep;
36 void Aspect_CircularGrid::SetDivisionNumber(const Standard_Integer aNumber) {
37 Standard_NegativeValue_Raise_if(aNumber < 0., "invalid division number");
38 Standard_NullValue_Raise_if(aNumber == 0. , "invalid division number");
39 myDivisionNumber = aNumber;
43 void Aspect_CircularGrid::SetGridValues
44 (const Quantity_Length theXOrigin,
45 const Quantity_Length theYOrigin,
46 const Quantity_Length theRadiusStep,
47 const Standard_Integer theDivisionNumber,
48 const Quantity_PlaneAngle theRotationAngle) {
49 myXOrigin = theXOrigin;
50 myYOrigin = theYOrigin;
51 Standard_NegativeValue_Raise_if(theRadiusStep < 0., "invalid radius step");
52 Standard_NullValue_Raise_if(theRadiusStep == 0. , "invalid radius step");
53 myRadiusStep= theRadiusStep;
54 Standard_NegativeValue_Raise_if(theDivisionNumber < 0., "invalid division number");
55 Standard_NullValue_Raise_if(theDivisionNumber == 0. , "invalid division number");
56 myDivisionNumber = theDivisionNumber;
57 myRotationAngle = theRotationAngle;
61 void Aspect_CircularGrid::Compute(const Quantity_Length X,
62 const Quantity_Length Y,
63 Quantity_Length& gridX,
64 Quantity_Length& gridY) const {
66 Standard_Real xo = XOrigin();
67 Standard_Real yo = YOrigin();
68 Standard_Real d = Sqrt( (xo-X)*(xo-X) + (yo-Y)*(yo-Y) );
69 Standard_Integer n = (Standard_Integer ) ( d/myRadiusStep + 0.5 ) ;
70 Standard_Real radius = Standard_Real(n) * myRadiusStep;
71 Standard_Real cosinus = (X-xo)/d;
72 Standard_Real a = ACos(cosinus);
73 Standard_Real ra = RotationAngle();
74 if ( Y < yo ) a = 2 * M_PI - a;
75 n = (Standard_Integer ) ((a-ra)/myAlpha + Sign(0.5, a-ra)) ;
77 Standard_Real cs=0,sn=0;
78 Standard_Boolean done = Standard_False;
79 Standard_Integer nmax = 2*myDivisionNumber;
80 Standard_Integer nquad,qmax;
83 nquad = 4; qmax = nmax/nquad;
84 if( (n == 0) || (!(nmax % nquad) && !(n % qmax)) ) {
85 Standard_Integer q = n/qmax;
101 done = Standard_True;
103 nquad = 2; qmax = nmax/nquad;
104 if( !(nmax % nquad) && !(n % qmax) ) {
105 Standard_Integer q = n/qmax;
115 done = Standard_True;
121 Standard_Real ang = ra + Standard_Real(n)*myAlpha;
122 cs = Cos(ang); sn = Sin(ang);
124 gridX = xo + cs * radius;
125 gridY = yo + sn * radius;
128 Quantity_Length Aspect_CircularGrid::RadiusStep() const {
132 Standard_Integer Aspect_CircularGrid::DivisionNumber () const {
133 return myDivisionNumber;
136 void Aspect_CircularGrid::Init () {
137 myAlpha = M_PI / Standard_Real(myDivisionNumber);
138 myA1 = Cos(myAlpha); myB1=Sin(myAlpha);