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.hxx>
17 #include <Aspect_Grid.hxx>
18 #include <Standard_NegativeValue.hxx>
19 #include <Standard_NullValue.hxx>
20 #include <Standard_NumericError.hxx>
21 #include <Standard_Type.hxx>
23 IMPLEMENT_STANDARD_RTTIEXT(Aspect_CircularGrid,Aspect_Grid)
25 Aspect_CircularGrid::Aspect_CircularGrid
26 (const Standard_Real aRadiusStep,
27 const Standard_Integer aDivisionNumber,
28 const Standard_Real anXOrigin,
29 const Standard_Real anYOrigin,
30 const Standard_Real aRotationAngle)
31 :Aspect_Grid(anXOrigin,anYOrigin,aRotationAngle),myRadiusStep(aRadiusStep),
32 myDivisionNumber(aDivisionNumber) {
35 void Aspect_CircularGrid::SetRadiusStep(const Standard_Real aRadiusStep) {
36 Standard_NegativeValue_Raise_if(aRadiusStep < 0., "invalid radius step");
37 Standard_NullValue_Raise_if(aRadiusStep == 0. , "invalid radius step");
38 myRadiusStep= aRadiusStep;
42 void Aspect_CircularGrid::SetDivisionNumber(const Standard_Integer aNumber) {
43 Standard_NegativeValue_Raise_if(aNumber < 0., "invalid division number");
44 Standard_NullValue_Raise_if(aNumber == 0. , "invalid division number");
45 myDivisionNumber = aNumber;
49 void Aspect_CircularGrid::SetGridValues
50 (const Standard_Real theXOrigin,
51 const Standard_Real theYOrigin,
52 const Standard_Real theRadiusStep,
53 const Standard_Integer theDivisionNumber,
54 const Standard_Real theRotationAngle) {
55 myXOrigin = theXOrigin;
56 myYOrigin = theYOrigin;
57 Standard_NegativeValue_Raise_if(theRadiusStep < 0., "invalid radius step");
58 Standard_NullValue_Raise_if(theRadiusStep == 0. , "invalid radius step");
59 myRadiusStep= theRadiusStep;
60 Standard_NegativeValue_Raise_if(theDivisionNumber < 0., "invalid division number");
61 Standard_NullValue_Raise_if(theDivisionNumber == 0. , "invalid division number");
62 myDivisionNumber = theDivisionNumber;
63 myRotationAngle = theRotationAngle;
67 void Aspect_CircularGrid::Compute(const Standard_Real X,
68 const Standard_Real Y,
70 Standard_Real& gridY) const {
72 Standard_Real xo = XOrigin();
73 Standard_Real yo = YOrigin();
74 Standard_Real d = Sqrt( (xo-X)*(xo-X) + (yo-Y)*(yo-Y) );
75 Standard_Integer n = (Standard_Integer ) ( d/myRadiusStep + 0.5 ) ;
76 Standard_Real radius = Standard_Real(n) * myRadiusStep;
77 Standard_Real cosinus = (X-xo)/d;
78 Standard_Real a = ACos(cosinus);
79 Standard_Real ra = RotationAngle();
80 if ( Y < yo ) a = 2 * M_PI - a;
81 n = (Standard_Integer ) ((a-ra)/myAlpha + Sign(0.5, a-ra)) ;
83 Standard_Real cs=0,sn=0;
84 Standard_Boolean done = Standard_False;
85 Standard_Integer nmax = 2*myDivisionNumber;
86 Standard_Integer nquad,qmax;
89 nquad = 4; qmax = nmax/nquad;
90 if( (n == 0) || (!(nmax % nquad) && !(n % qmax)) ) {
91 Standard_Integer q = n/qmax;
107 done = Standard_True;
109 nquad = 2; qmax = nmax/nquad;
110 if( !(nmax % nquad) && !(n % qmax) ) {
111 Standard_Integer q = n/qmax;
121 done = Standard_True;
127 Standard_Real ang = ra + Standard_Real(n)*myAlpha;
128 cs = Cos(ang); sn = Sin(ang);
130 gridX = xo + cs * radius;
131 gridY = yo + sn * radius;
134 Standard_Real Aspect_CircularGrid::RadiusStep() const {
138 Standard_Integer Aspect_CircularGrid::DivisionNumber () const {
139 return myDivisionNumber;
142 void Aspect_CircularGrid::Init () {
143 myAlpha = M_PI / Standard_Real(myDivisionNumber);
144 myA1 = Cos(myAlpha); myB1=Sin(myAlpha);