GEO/GEO_PrimCircle.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Cristin Barghiel
 *      Side Effects Software Inc.
 *      20 Maud St.
 *      Toronto, Ontario,  M5V 2M5
 *      Canada
 *      416-366-4607
 *
 * NAME:        Geometry Library (C++)
 *
 * COMMENTS:    Circle (ellipse) primitive.
 *
 *
 */

#ifndef __GEO_PrimCircle_H__
#define __GEO_PrimCircle_H__

#include "GEO_API.h"
#include "GEO_PrimType.h"
#include "GEO_Quadric.h"
#include "GEO_Vertex.h"

#define GEO_CIRCLE_XSECT_XP     0
#define GEO_CIRCLE_XSECT_XN     1
#define GEO_CIRCLE_XSECT_YP     2
#define GEO_CIRCLE_XSECT_YN     3

#define GEO_CIRCLE_GUIDEEDGE_X  0
#define GEO_CIRCLE_GUIDEEDGE_Y  1

class GEO_Detail;

class GEO_API GEO_PrimCircle : public GEO_Quadric {
public:
             GEO_PrimCircle(GEO_Detail *d);
    virtual ~GEO_PrimCircle();

    // Methods inherited from the parent class:
    virtual unsigned     getPrimitiveId() const;

    // Evaluate the position or the derivative at domain point (u,v), where
    // u and v MUST be in [0,1]. "v" and "dv" will be ignored here. Return 0 if
    // OK and -1 otherwise.
    virtual bool         evaluatePoint(GEO_Vertex &result,
                                        GEO_AttributeHandleList &hlist,
                                        fpreal u_unit, fpreal,
                                        uint du, uint) const;
    virtual int          evaluatePoint( UT_Vector4 &pos, float u_unit, float=0,
                                        unsigned du=0, unsigned = 0) const;
    virtual int          evaluatePointWAttrib(UT_Vector4 &pos,
                                        GB_AttributeData &adata,
                                        const GB_FloatOffsets &foffsets,
                                        float u_unit, float=0, unsigned du = 0,
                                        unsigned = 0) const;

    virtual int          getBBox(UT_BoundingBox *bbox) const;
    virtual void         addToBSphere(UT_BoundingSphere *bsphere) const;
    virtual UT_Vector3   computeNormal() const;
    virtual UT_Vector3   baryCenter() const;

    virtual int         hasGuideEdge(int edgeid, UT_Vector4 &a, 
                                                 UT_Vector4 &b) const;
    virtual int         hasXsectPoint(int pointid, UT_Vector4 &p) const;

    virtual float       calcVolume(UT_Vector3 &refpt) const;
    virtual float       calcArea() const;
    virtual float       calcPerimeter() const;
private:
    friend ostream      &operator<<(ostream &os, const GEO_PrimCircle &d)
                        {
                            d.save(os, 0);
                            return os;
                        }
};
#endif

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