curve.h

/*== SAGITTARIUS =====================================================================
 * Copyright (c) 2012, Jesse K Medley
 * All rights reserved.

 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of The University of Washington nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

//== FILEDOC =========================================================================

//== BEGINNING OF CODE ===============================================================

#ifndef __SBNW_LAYOUT_CURVE_H_
#define __SBNW_LAYOUT_CURVE_H_

//== INCLUDES ========================================================================

#include "graphfab/core/SagittariusCore.h"
#include "graphfab/layout/point.h"
#include "graphfab/math/transform.h"
#include "graphfab/layout/arrowhead.h"

//-- C++ code --
#ifdef __cplusplus

#include <string>

#include <iostream>

namespace Graphfab {
    
    typedef enum {
        RXN_CURVE_SUBSTRATE,
        RXN_CURVE_PRODUCT,
        RXN_CURVE_ACTIVATOR,
        RXN_CURVE_INHIBITOR,
        RXN_CURVE_MODIFIER
    } RxnCurveType;

    class Node;

    class RxnBezier {
        public:
            RxnBezier() {
              ns = ne = NULL;
            }

            virtual ~RxnBezier() {
                if(as && owns)
                    delete as;
                if(ae && owne)
                    delete ae;
            }
            
            virtual RxnCurveType getRole() const = 0;
            
            void applyTransform(const Affine2d& t) {
                s  = xformPoint(s, t);
                c1 = xformPoint(c1,t);
                c2 = xformPoint(c2,t);
                e  = xformPoint(e, t);
            }
            
            Point* as;
            int owns;
            
            Point* ae;
            int owne;

            Node* ns;
            Node* ne;
            
            //Calculated points:
            Point s, e, c1, c2;
            
            Point getTransformedS() const { return tf_*s; }
            Point getTransformedE() const { return tf_*e; }
            Point getTransformedC1() const { return tf_*c1; }
            Point getTransformedC2() const { return tf_*c2; }

            virtual Point getCentroidCP() const = 0;

            virtual bool isStartNodeSide() const = 0;

            Point getNodeSideCP() const {
              if (isStartNodeSide())
                return c1;
              else
                return c2;
            }

            void setNodeSideCP(const Point& p) {
              if (isStartNodeSide())
                c1 = p;
              else
                c2 = p;
            }

            Point getNodeSide() const {
              if (isStartNodeSide())
                return s;
              else
                return e;
            }

            void setNodeSide(const Point& p) {
              if (isStartNodeSide())
                s = p;
              else
                e = p;
            }

            Node* getNodeUsed() const {
              if (isStartNodeSide())
                return ns;
              else
                return ne;
            }

            bool includes(const Node* n) {
              if (ns ==  n)
                return true;
              else if (ne == n)
                return true;
              else
                return false;
            }

            virtual bool hasArrowhead() const { return false; }

            void transformArrowhead(Arrowhead& a) {
              Point v;
              if ((e - c2).mag2() < 1e-2)
                v = (e - s).normed() * 5.;
              else
                v = (e - c2).normed() * 5.;
              Point u = v.dextro();

              a.setTransform(tf_*Affine2d::fromBasis(u, v, e));
              a.setInverseTransform(a.getTransform().inv());
            }

            // For non-curved segments
//             void transformArrowheadFlat(Arrowhead& a) {
//               Point v = (e - s).normed() * 5.;
//               Point u = v.dextro();
//
//               a.setTransform(tf_*Affine2d::fromBasis(u, v, e));
//               a.setInverseTransform(a.getTransform().inv());
//             }

            virtual Arrowhead* getArrowhead() {
              Arrowhead* result = new PlainArrowhead();
              transformArrowhead(*result);
              return result;
            }
            
            Affine2d getTransform() const { return tf_; }
            
            void setTransform(const Affine2d& tf, bool recurse = true) { tf_ = tf; }
            
            Affine2d getInverseTransform() const { return itf_; }
            
            void setInverseTransform(const Affine2d& itf, bool recurse = true) { itf_ = itf; }

            virtual ArrowheadStyle getArrowheadStyle() const = 0;
            
            
            Affine2d tf_;
            Affine2d itf_;
        protected:
    };
    
    inline std::ostream& operator<< (std::ostream& os, const RxnBezier& b) {
        os << b.s << "-" << b.c1 << "-" << b.c2 << "-" << b.e;
        return os;
    }
    
}

#endif

#endif