#ifndef CNS_SHEAR_SEQUENCE_H
#define CNS_SHEAR_SEQUENCE_H

#include "cns.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef struct CNS_ShearSequence * CNS_ShearSequencePtr;

/** 
 * Compute the shear sequence on the given nesting.
 *
 * If there is an interpart gap beteween parts (see CNS_SetInterpartGap), then there must be a shear
 * gap (see CNS_SetShearGap) that is greater or equal otherwise a sequence can not be found.  In
 * this case, if there is some non zero border gaps (see CNS_SetSheetGaps) the border gaps must be
 * greater or equal then the interpart gap.
 */
CNS_EXPORT CNS_ShearSequencePtr CNS_API CNS_ComputeShearSequence(CNS_NestingPtr nesting);

/**
 * Delete the shear sequence.
 */
CNS_EXPORT void CNS_API CNS_DeleteShearSequence(CNS_ShearSequencePtr sequence);

/** 
 * For debugging, display the shear sequence in SVG
 */
CNS_EXPORT void CNS_API CNS_DrawShearSequence(CNS_NestingPtr nesting,
                                              CNS_ShearSequencePtr sequence,
                                              const char * filename);
/**
 * return the number of cut elements in the given shear sequence
 */
CNS_EXPORT unsigned CNS_API
CNS_GetNumberOfElementsInShearSequence(CNS_ShearSequencePtr sequence);

/**
 * return the given element in the given shear sequence
 */ 
CNS_EXPORT void CNS_API
CNS_GetElementInShearSequence(CNS_ShearSequencePtr sequence,
                              unsigned element,
                              double * xo, double * yo,
                              double * xe, double * ye);

/** 
 * return the number of offcuts in the shear sequence
 */
CNS_EXPORT unsigned CNS_API
CNS_GetNumberOfOffcutsInShearSequence(CNS_ShearSequencePtr sequence);

/**
 * return the given offcut in the shear sequence
 */
CNS_EXPORT void CNS_API
CNS_GetOffcutInShearSequence(CNS_ShearSequencePtr sequence,
                             unsigned offcut,
                             double * minx, double * miny,
                             double * maxx, double * maxy);
    

#ifdef __cplusplus
}
#endif

#endif