/usr/include/dx/pick.h is in libdx4-dev 1:4.4.4-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/* Open Visualization Data Explorer */
/* (C) Copyright IBM Corp. 1989,1999 */
/* ALL RIGHTS RESERVED */
/* This code licensed under the */
/* "IBM PUBLIC LICENSE - Open Visualization Data Explorer" */
/***********************************************************************/
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
#ifndef _DXI_PICK_H_
#define _DXI_PICK_H_
/*
* Given a field containing pick information, this routine returns
* the number of pokes. Probably never returns an error.
*/
Error
DXQueryPokeCount(Field picks, int *pokeCount);
/*
* Given a field containing pick information and a poke number,
* this routine returns the number of picks resulting from that
* poke. Errors include requesting a pick count for a non-existent
* poke.
*/
Error
DXQueryPickCount(Field picks, int poke, int *pickCount);
/*
* Given a field containing pick information, a poke number and
* a pick number, return the pick point in world coordinates.
*/
Error
DXGetPickPoint(Field picks, int poke, int pick, Point *point);
/*
* Given a field containing pick information, a poke number and
* a pick number within that poke, this routine returns the length
* of the pick path, a pointer to the pick path itself, the index
* of the picked element in the field and the index of the closest
* vertex of the picked element (in screen space) to the poke.
* If the field contains no connections component, the element
* and vertex indices will be the index of the closest point to the
* poke point. Errors would include non-existent poke number and
* non-existent pick number.
*/
Error
DXQueryPickPath(Field picks, int poke, int pick,
int *pathLength, int **path, int *eid, int *vid);
/*
* The following routine would be used to actually traverse the
* data object to reach the picked field, element and vertex.
* Given a current object (initially the root of the data object),
* a pointer to a matrix (initially identity), and an index from
* the pick path, it returns the sub-object of the current object
* selected by index. When Xform objects are encountered, the
* matrix associated with the Xform is concatenated onto that
* pointed to by the matrix parameter (if one was passed in). When
* the end of the path is found (either by recognizing that the
* returned object is a field or that the returned object is the
* same as the current object) the caller is left with the picked
* field and a transform carrying the coordinate system of that
* field to the eye coordinate system. If there are two remaining
* pick path elements, then they are the picked element and vertex
* numbers; if only one remains, it is a vertex number. Returns
* NULL on error, including invalid path index (eg. child 27 for
* a Xform object).
*/
Object
DXTraversePickPath(Object current, int index, Matrix *matrix);
/*
* Example: find every picked vertex.
*
* DXQueryPokeCount(pickField, &nPokes);
*
* for (poke = 0; poke < nPokes; poke++)
* {
* DXQueryPickCount(pickField, poke, &nPicks);
*
* for (pick = 0; pick < nPicks; pick++)
* {
* DXQueryPickPath(pickField, poke, pick,
* &pathLen, &path, &eid, &vid);
*
* current = dataObject;
* matrix = Identity;
*
* for (i = 0; i < pathLen; i++)
* {
* current = DXTraversePickPath(current, path[i], &matrix);
* if (current == NULL)
* goto error;
* }
*
*
* now futz with vertex #vid in field current.
*
* }
* }
*/
#endif /* _DXI_PICK_H_ */
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
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