Panda3D
Classes | Public Member Functions | Static Public Member Functions | List of all members
NurbsCurve Class Reference

A Nonuniform Rational B-Spline. More...

#include "nurbsCurve.h"

Inheritance diagram for NurbsCurve:
PiecewiseCurve NurbsCurveInterface ParametricCurve PandaNode TypedWritableReferenceCount Namable LinkedListNode TypedWritable ReferenceCount MemoryBase TypedObject MemoryBase MemoryBase

Public Member Functions

 NurbsCurve (const ParametricCurve &pc)
 Constructs a NURBS curve equivalent to the indicated (possibly non-NURBS) curve. More...
 
 NurbsCurve (int order, int num_cvs, const PN_stdfloat knots[], const LVecBase4 cvs[])
 Constructs a NURBS curve according to the indicated NURBS parameters. More...
 
virtual bool convert_to_nurbs (ParametricCurve *nc) const
 Stores in the indicated NurbsCurve a NURBS representation of an equivalent curve. More...
 
virtual TypeHandle force_init_type ()
 
CubicCurvesegget_curveseg (int ti)
 
virtual LVecBase4 get_cv (int n) const
 Returns the position in homogeneous space of the indicated CV. More...
 
virtual PN_stdfloat get_knot (int n) const
 Retrieves the value of the indicated knot. More...
 
virtual int get_num_cvs () const
 
virtual int get_num_knots () const
 Returns the number of knots on the curve. More...
 
virtual NurbsCurveInterfaceget_nurbs_interface ()
 Returns a pointer to the object as a NurbsCurveInterface object if it happens to be a NURBS-style curve; otherwise, returns NULL. More...
 
virtual int get_order () const
 
virtual TypeHandle get_type () const
 
virtual bool insert_cv (PN_stdfloat t)
 Inserts a new CV into the middle of the curve at the indicated parametric value. More...
 
virtual PandaNodemake_copy () const
 Returns a newly-allocated PandaNode that is a shallow copy of this one. More...
 
virtual bool rebuild_curveseg (int rtype0, PN_stdfloat t0, const LVecBase4 &v0, int rtype1, PN_stdfloat t1, const LVecBase4 &v1, int rtype2, PN_stdfloat t2, const LVecBase4 &v2, int rtype3, PN_stdfloat t3, const LVecBase4 &v3)
 Rebuilds the current curve segment (as selected by the most recent call to find_curve()) according to the specified properties (see CubicCurveseg::compute_seg). More...
 
virtual bool recompute ()
 Recalculates the curve basis according to the latest position of the CV's, knots, etc. More...
 
virtual void remove_all_cvs ()
 Removes all CV's from the curve. More...
 
virtual bool remove_cv (int n)
 Removes the indicated CV from the curve. More...
 
virtual bool set_cv (int n, const LVecBase4 &v)
 Repositions the indicated CV. More...
 
virtual bool set_knot (int n, PN_stdfloat t)
 Sets the value of the indicated knot. More...
 
virtual void set_order (int order)
 Changes the order of the curve. More...
 
virtual bool stitch (const ParametricCurve *a, const ParametricCurve *b)
 Regenerates this curve as one long curve: the first curve connected end-to- end with the second one. More...
 
virtual void write (std::ostream &out, int indent_level=0) const
 
- Public Member Functions inherited from PiecewiseCurve
virtual bool adjust_point (PN_stdfloat t, PN_stdfloat px, PN_stdfloat py, PN_stdfloat pz)
 Recomputes the curve such that it passes through the point (px, py, pz) at time t, but keeps the same tangent value at that point. More...
 
virtual bool adjust_pt (PN_stdfloat t, PN_stdfloat px, PN_stdfloat py, PN_stdfloat pz, PN_stdfloat tx, PN_stdfloat ty, PN_stdfloat tz)
 Recomputes the curve such that it passes through the point (px, py, pz) with the tangent (tx, ty, tz). More...
 
virtual bool adjust_tangent (PN_stdfloat t, PN_stdfloat tx, PN_stdfloat ty, PN_stdfloat tz)
 Recomputes the curve such that it has the tangent (tx, ty, tz) at time t, but keeps the same position at the point. More...
 
virtual bool get_2ndtangent (PN_stdfloat t, LVecBase3 &tangent2) const
 Returns the tangent of the first derivative of the curve at the point t. More...
 
virtual bool get_bezier_segs (BezierSegs &bz_segs) const
 Fills up the indicated vector with a list of BezierSeg structs that describe the curve. More...
 
ParametricCurveget_curveseg (int ti)
 Returns the curve segment corresponding to the given index. More...
 
virtual PN_stdfloat get_max_t () const
 Returns the upper bound of t for the entire curve. More...
 
int get_num_segs () const
 Returns the number of curve segments that make up the Piecewise curve. More...
 
virtual bool get_point (PN_stdfloat t, LVecBase3 &point) const
 Returns the point of the curve at a given parametric point t. More...
 
virtual bool get_pt (PN_stdfloat t, LVecBase3 &point, LVecBase3 &tangent) const
 Simultaneously returns the point and tangent of the curve at a given parametric point t. More...
 
virtual bool get_tangent (PN_stdfloat t, LVecBase3 &tangent) const
 Returns the tangent of the curve at a given parametric point t. More...
 
PN_stdfloat get_tend (int ti) const
 Returns the parametric end of the given segment of the curve. More...
 
PN_stdfloat get_tlength (int ti) const
 Returns the parametric length of the given segment of the curve. More...
 
PN_stdfloat get_tstart (int ti) const
 Returns the parametric start of the given segment of the curve. More...
 
bool insert_curveseg (int ti, ParametricCurve *seg, PN_stdfloat tlength)
 Inserts a new curve segment at the indicated index. More...
 
virtual bool is_valid () const
 Returns true if the curve is defined. More...
 
void make_nurbs (int order, int num_cvs, const PN_stdfloat knots[], const LVecBase4 cvs[])
 Defines the curve as a general NURBS curve. More...
 
void remove_all_curvesegs ()
 Removes all curve segments from the curve. More...
 
bool remove_curveseg (int ti)
 Removes the given curve segment from the curve and frees it. More...
 
bool set_tlength (int ti, PN_stdfloat tlength)
 Sets the parametric length of the given segment of the curve. More...
 
- Public Member Functions inherited from ParametricCurve
 ParametricCurve ()
 This is a virtual base class. More...
 
PN_stdfloat calc_length () const
 Approximates the length of the entire curve to within a few decimal places. More...
 
PN_stdfloat calc_length (PN_stdfloat from, PN_stdfloat to) const
 Approximates the length of the curve segment from parametric time 'from' to time 'to'. More...
 
virtual bool convert_to_hermite (HermiteCurve *hc) const
 Stores an equivalent curve representation in the indicated Hermite curve, if possible. More...
 
PN_stdfloat find_length (PN_stdfloat start_t, PN_stdfloat length_offset) const
 Returns the parametric value corresponding to the indicated distance along the curve from the starting parametric value. More...
 
virtual bool get_bezier_seg (BezierSeg &) const
 Fills the BezierSeg structure with a description of the curve segment as a Bezier, if possible, but does not change the _t member of the structure. More...
 
int get_curve_type () const
 Returns the flag indicating the use to which the curve is intended to be put. More...
 
int get_num_dimensions () const
 Returns the number of significant dimensions in the curve's vertices, as set by a previous call to set_num_dimensions(). More...
 
void register_drawer (ParametricCurveDrawer *drawer)
 Registers a Drawer with this curve that will automatically be updated whenever the curve is modified, so that the visible representation of the curve is kept up to date. More...
 
virtual bool safe_to_flatten () const
 Returns true if it is generally safe to flatten out this particular kind of PandaNode by duplicating instances, false otherwise (for instance, a Camera cannot be safely flattened, because the Camera pointer itself is meaningful). More...
 
virtual bool safe_to_transform () const
 Returns true if it is generally safe to transform this particular kind of PandaNode by calling the xform() method, false otherwise. More...
 
void set_curve_type (int type)
 Sets the flag indicating the use to which the curve is intended to be put. More...
 
void set_num_dimensions (int num)
 Specifies the number of significant dimensions in the curve's vertices. More...
 
void unregister_drawer (ParametricCurveDrawer *drawer)
 Removes a previously registered drawer from the list of automatically- refreshed drawers. More...
 
bool write_egg (Filename filename, CoordinateSystem cs=CS_default)
 Writes an egg description of the nurbs curve to the specified output file. More...
 
bool write_egg (std::ostream &out, const Filename &filename, CoordinateSystem cs)
 Writes an egg description of the nurbs curve to the specified output stream. More...
 
- Public Member Functions inherited from PandaNode
 PandaNode (const std::string &name)
 
void add_child (PandaNode *child_node, int sort=0, Thread *current_thread=Thread::get_current_thread())
 
virtual void add_for_draw (CullTraverser *trav, CullTraverserData &data)
 Adds the node's contents to the CullResult we are building up during the cull traversal, so that it will be drawn at render time. More...
 
void add_stashed (PandaNode *child_node, int sort=0, Thread *current_thread=Thread::get_current_thread())
 Adds a new child to the node, directly as a stashed child. More...
 
void adjust_draw_mask (DrawMask show_mask, DrawMask hide_mask, DrawMask clear_mask)
 Adjusts the hide/show bits of this particular node. More...
 
virtual void apply_attribs_to_vertices (const AccumulatedAttribs &attribs, int attrib_types, GeomTransformer &transformer)
 Applies whatever attributes are specified in the AccumulatedAttribs object (and by the attrib_types bitmask) to the vertices on this node, if appropriate. More...
 
virtual Lightas_light ()
 Cross-casts the node to a Light pointer, if it is one of the four kinds of Light nodes, or returns NULL if it is not. More...
 
void clear_attrib (TypeHandle type)
 
void clear_attrib (int slot)
 Removes the render attribute of the given type from this node. More...
 
void clear_bounds ()
 Reverses the effect of a previous call to set_bounds(), and allows the node's bounding volume to be automatically computed once more based on the contents of the node. More...
 
void clear_effect (TypeHandle type)
 Removes the render effect of the given type from this node. More...
 
void clear_effects (Thread *current_thread=Thread::get_current_thread())
 
void clear_state (Thread *current_thread=Thread::get_current_thread())
 
void clear_tag (const std::string &key, Thread *current_thread=Thread::get_current_thread())
 
void clear_transform (Thread *current_thread=Thread::get_current_thread())
 
void clear_unexpected_change (unsigned int flags)
 Sets one or more of the PandaNode::UnexpectedChange bits off, indicating that the corresponding property may once again change on this node. More...
 
virtual PandaNodecombine_with (PandaNode *other)
 Collapses this PandaNode with the other PandaNode, if possible, and returns a pointer to the combined PandaNode, or NULL if the two PandaNodes cannot safely be combined. More...
 
int compare_tags (const PandaNode *other) const
 Returns a number less than 0, 0, or greater than 0, to indicate the similarity of tags between this node and the other one. More...
 
void copy_all_properties (PandaNode *other)
 Copies the TransformState, RenderState, RenderEffects, tags, Python tags, and the show/hide state from the other node onto this one. More...
 
void copy_children (PandaNode *other, Thread *current_thread=Thread::get_current_thread())
 Makes another instance of all the children of the other node, copying them to this node. More...
 
void copy_tags (PandaNode *other)
 Copies all of the tags stored on the other node onto this node. More...
 
int count_num_descendants () const
 
virtual CPT (TransformState) calc_tight_bounds(LPoint3 &min_point
 
 CPT (RenderAttrib) get_attrib(TypeHandle type) const
 
 CPT (RenderAttrib) get_attrib(int slot) const
 
 CPT (RenderEffect) get_effect(TypeHandle type) const
 
 CPT (RenderState) get_state(Thread *current_thread
 
 CPT (RenderEffects) get_effects(Thread *current_thread
 
 CPT (TransformState) get_transform(Thread *current_thread
 
 CPT (TransformState) get_prev_transform(Thread *current_thread
 
 CPT (RenderAttrib) get_off_clip_planes(Thread *current_thread
 
 CPT (BoundingVolume) get_bounds(Thread *current_thread
 
 CPT (BoundingVolume) get_bounds(UpdateSeq &seq
 
 CPT (BoundingVolume) get_internal_bounds(Thread *current_thread
 
virtual bool cull_callback (CullTraverser *trav, CullTraverserData &data)
 
virtual PandaNodedupe_for_flatten () const
 This is similar to make_copy(), but it makes a copy for the specific purpose of flatten. More...
 
int find_child (PandaNode *node, Thread *current_thread=Thread::get_current_thread()) const
 Returns the index of the indicated child node, if it is a child, or -1 if it is not. More...
 
int find_parent (PandaNode *node, Thread *current_thread=Thread::get_current_thread()) const
 Returns the index of the indicated parent node, if it is a parent, or -1 if it is not. More...
 
int find_stashed (PandaNode *node, Thread *current_thread=Thread::get_current_thread()) const
 Returns the index of the indicated stashed node, if it is a stashed child, or -1 if it is not. More...
 
BoundingVolume::BoundsType get_bounds_type () const
 
PandaNodeget_child (int n, Thread *current_thread=Thread::get_current_thread()) const
 
int get_child_sort (int n, Thread *current_thread=Thread::get_current_thread()) const
 Returns the sort index of the nth child node of this node (that is, the number that was passed to add_child()). More...
 
Children get_children (Thread *current_thread=Thread::get_current_thread()) const
 
DrawMask get_draw_control_mask () const
 
DrawMask get_draw_show_mask () const
 
int get_fancy_bits (Thread *current_thread=Thread::get_current_thread()) const
 Returns the union of all of the enum FancyBits values corresponding to the various "fancy" attributes that are set on the node. More...
 
virtual int get_first_visible_child () const
 Returns the index number of the first visible child of this node, or a number >= get_num_children() if there are no visible children of this node. More...
 
int get_internal_vertices (Thread *current_thread=Thread::get_current_thread()) const
 
CollideMask get_into_collide_mask () const
 
virtual CollideMask get_legal_collide_mask () const
 
int get_nested_vertices (Thread *current_thread=Thread::get_current_thread()) const
 
CollideMask get_net_collide_mask (Thread *current_thread=Thread::get_current_thread()) const
 Returns the union of all into_collide_mask() values set at CollisionNodes at this level and below. More...
 
DrawMask get_net_draw_control_mask () const
 Returns the set of bits in get_net_draw_show_mask() that have been explicitly set via adjust_draw_mask(), rather than implicitly inherited. More...
 
DrawMask get_net_draw_show_mask () const
 Returns the union of all draw_show_mask values–of renderable nodes only– at this level and below. More...
 
virtual int get_next_visible_child (int n) const
 Returns the index number of the next visible child of this node following the indicated child, or a number >= get_num_children() if there are no more visible children of this node. More...
 
int get_num_children (Thread *current_thread=Thread::get_current_thread()) const
 
int get_num_parents (Thread *current_thread=Thread::get_current_thread()) const
 
int get_num_stashed (Thread *current_thread=Thread::get_current_thread()) const
 
size_t get_num_tags () const
 
PandaNodeget_parent (int n, Thread *current_thread=Thread::get_current_thread()) const
 
Parents get_parents (Thread *current_thread=Thread::get_current_thread()) const
 
PandaNodeget_stashed (int n, Thread *current_thread=Thread::get_current_thread()) const
 
Stashed get_stashed (Thread *current_thread=Thread::get_current_thread()) const
 
int get_stashed_sort (int n, Thread *current_thread=Thread::get_current_thread()) const
 Returns the sort index of the nth stashed node of this node (that is, the number that was passed to add_child()). More...
 
std::string get_tag (const std::string &key, Thread *current_thread=Thread::get_current_thread()) const
 
std::string get_tag_key (size_t i) const
 
void get_tag_keys (vector_string &keys) const
 Fills the given vector up with the list of tags on this PandaNode. More...
 
unsigned int get_unexpected_change (unsigned int flags) const
 Returns nonzero if any of the bits in the input parameter are set on this node, or zero if none of them are set. More...
 
virtual int get_unsafe_to_apply_attribs () const
 Returns the union of all attributes from SceneGraphReducer::AttribTypes that may not safely be applied to the vertices of this node. More...
 
virtual int get_visible_child () const
 Returns the index number of the currently visible child of this node. More...
 
bool has_attrib (TypeHandle type) const
 
bool has_attrib (int slot) const
 
bool has_dirty_prev_transform () const
 
bool has_effect (TypeHandle type) const
 
virtual bool has_selective_visibility () const
 Should be overridden by derived classes to return true if this kind of node has some restrictions on the set of children that should be rendered. More...
 
virtual bool has_single_child_visibility () const
 Should be overridden by derived classes to return true if this kind of node has the special property that just one of its children is visible at any given time, and furthermore that the particular visible child can be determined without reference to any external information (such as a camera). More...
 
bool has_tag (const std::string &key, Thread *current_thread=Thread::get_current_thread()) const
 
bool has_tags () const
 
virtual bool is_ambient_light () const
 Returns true if this is an AmbientLight, false if it is not a light, or it is some other kind of light. More...
 
bool is_bounds_stale () const
 
virtual bool is_collision_node () const
 A simple downcast check. More...
 
bool is_final (Thread *current_thread=Thread::get_current_thread()) const
 
virtual bool is_geom_node () const
 A simple downcast check. More...
 
virtual bool is_lod_node () const
 A simple downcast check. More...
 
bool is_overall_hidden () const
 
virtual bool is_renderable () const
 Returns true if there is some value to visiting this particular node during the cull traversal for any camera, false otherwise. More...
 
bool is_scene_root () const
 Returns true if this particular node is known to be the render root of some active DisplayRegion associated with the global GraphicsEngine, false otherwise. More...
 
bool is_under_scene_root () const
 Returns true if this particular node is in a live scene graph: that is, it is a child or descendent of a node that is itself a scene root. More...
 
void list_tags (std::ostream &out, const std::string &separator="\n") const
 Writes a list of all the tag keys assigned to the node to the indicated stream. More...
 
void ls (std::ostream &out, int indent_level) const
 
void mark_bounds_stale (Thread *current_thread=Thread::get_current_thread()) const
 
void mark_internal_bounds_stale (Thread *current_thread=Thread::get_current_thread())
 
virtual void output (std::ostream &out) const
 
void prepare_scene (GraphicsStateGuardianBase *gsg, const RenderState *node_state)
 
virtual bool preserve_name () const
 Returns true if the node's name has extrinsic meaning and must be preserved across a flatten operation, false otherwise. More...
 
 PT (PandaNode) copy_subgraph(Thread *current_thread
 
virtual void r_prepare_scene (GraphicsStateGuardianBase *gsg, const RenderState *node_state, GeomTransformer &transformer, Thread *current_thread)
 The recursive implementation of prepare_scene(). More...
 
void remove_all_children (Thread *current_thread=Thread::get_current_thread())
 Removes all the children from the node at once, including stashed children. More...
 
void remove_child (int child_index, Thread *current_thread=Thread::get_current_thread())
 Removes the nth child from the node. More...
 
bool remove_child (PandaNode *child_node, Thread *current_thread=Thread::get_current_thread())
 Removes the indicated child from the node. More...
 
void remove_stashed (int child_index, Thread *current_thread=Thread::get_current_thread())
 Removes the nth stashed child from the node. More...
 
bool replace_child (PandaNode *orig_child, PandaNode *new_child, Thread *current_thread=Thread::get_current_thread())
 Searches for the orig_child node in the node's list of children, and replaces it with the new_child instead. More...
 
void replace_node (PandaNode *other)
 Inserts this node into the scene graph in place of the other one, and removes the other node. More...
 
void reset_prev_transform (Thread *current_thread=Thread::get_current_thread())
 Resets the transform that represents this node's "previous" position to the same as the current transform. More...
 
virtual bool safe_to_combine () const
 Returns true if it is generally safe to combine this particular kind of PandaNode with other kinds of PandaNodes of compatible type, adding children or whatever. More...
 
virtual bool safe_to_combine_children () const
 Returns true if it is generally safe to combine the children of this PandaNode with each other. More...
 
virtual bool safe_to_flatten_below () const
 Returns true if a flatten operation may safely continue past this node, or false if nodes below this node may not be molested. More...
 
virtual bool safe_to_modify_transform () const
 Returns true if it is safe to automatically adjust the transform on this kind of node. More...
 
void set_attrib (const RenderAttrib *attrib, int override=0)
 Adds the indicated render attribute to the scene graph on this node. More...
 
void set_bound (const BoundingVolume *volume)
 Deprecated. More...
 
void set_bounds (const BoundingVolume *volume)
 Resets the bounding volume so that it is the indicated volume. More...
 
void set_bounds_type (BoundingVolume::BoundsType bounds_type)
 Specifies the desired type of bounding volume that will be created for this node. More...
 
void set_effect (const RenderEffect *effect)
 Adds the indicated render effect to the scene graph on this node. More...
 
void set_effects (const RenderEffects *effects, Thread *current_thread=Thread::get_current_thread())
 
void set_final (bool flag)
 
void set_into_collide_mask (CollideMask mask)
 
void set_overall_hidden (bool overall_hidden)
 
void set_prev_transform (const TransformState *transform, Thread *current_thread=Thread::get_current_thread())
 Sets the transform that represents this node's "previous" position, one frame ago, for the purposes of detecting motion for accurate collision calculations. More...
 
void set_state (const RenderState *state, Thread *current_thread=Thread::get_current_thread())
 
void set_tag (const std::string &key, const std::string &value, Thread *current_thread=Thread::get_current_thread())
 
void set_transform (const TransformState *transform, Thread *current_thread=Thread::get_current_thread())
 
void set_unexpected_change (unsigned int flags)
 Sets one or more of the PandaNode::UnexpectedChange bits on, indicating that the corresponding property should not change again on this node. More...
 
bool stash_child (PandaNode *child_node, Thread *current_thread=Thread::get_current_thread())
 Stashes the indicated child node. More...
 
void stash_child (int child_index, Thread *current_thread=Thread::get_current_thread())
 Stashes the indicated child node. More...
 
void steal_children (PandaNode *other, Thread *current_thread=Thread::get_current_thread())
 Moves all the children from the other node onto this node. More...
 
bool unstash_child (PandaNode *child_node, Thread *current_thread=Thread::get_current_thread())
 Returns the indicated stashed node to normal child status. More...
 
void unstash_child (int stashed_index, Thread *current_thread=Thread::get_current_thread())
 Returns the indicated stashed node to normal child status. More...
 
virtual void update_bam_nested (BamWriter *manager)
 Called by the BamWriter when this object has not itself been modified recently, but it should check its nested objects for updates. More...
 
void write_recorder (BamWriter *manager, Datagram &dg)
 This method is provided for the benefit of classes (like MouseRecorder) that inherit from PandaMode and also RecorderBase. More...
 
virtual void xform (const LMatrix4 &mat)
 Transforms the contents of this PandaNode by the indicated matrix, if it means anything to do so. More...
 
- Public Member Functions inherited from TypedWritableReferenceCount
 TypedWritableReferenceCount (const TypedWritableReferenceCount &copy)
 
virtual ReferenceCountas_reference_count ()
 Returns the pointer cast to a ReferenceCount pointer, if it is in fact of that type. More...
 
void operator= (const TypedWritableReferenceCount &copy)
 
- Public Member Functions inherited from TypedWritable
 TypedWritable (const TypedWritable &copy)
 
vector_uchar encode_to_bam_stream () const
 Converts the TypedWritable object into a single stream of data using a BamWriter, and returns that data as a bytes object. More...
 
bool encode_to_bam_stream (vector_uchar &data, BamWriter *writer=nullptr) const
 Converts the TypedWritable object into a single stream of data using a BamWriter, and stores that data in the indicated string. More...
 
virtual void finalize (BamReader *manager)
 Called by the BamReader to perform any final actions needed for setting up the object after all objects have been read and all pointers have been completed. More...
 
UpdateSeq get_bam_modified () const
 Returns the current bam_modified counter. More...
 
void mark_bam_modified ()
 Increments the bam_modified counter, so that this object will be invalidated and retransmitted on any open bam streams. More...
 
void operator= (const TypedWritable &copy)
 
virtual bool require_fully_complete () const
 Some objects require all of their nested pointers to have been completed before the objects themselves can be completed. More...
 
- Public Member Functions inherited from TypedObject
 TypedObject (const TypedObject &copy)=default
 
TypedObjectas_typed_object ()
 Returns the object, upcast (if necessary) to a TypedObject pointer. More...
 
const TypedObjectas_typed_object () const
 Returns the object, upcast (if necessary) to a TypedObject pointer. More...
 
int get_best_parent_from_Set (const std::set< int > &) const
 
int get_type_index () const
 Returns the internal index number associated with this object's TypeHandle, a unique number for each different type. More...
 
bool is_exact_type (TypeHandle handle) const
 Returns true if the current object is the indicated type exactly. More...
 
bool is_of_type (TypeHandle handle) const
 Returns true if the current object is or derives from the indicated type. More...
 
TypedObjectoperator= (const TypedObject &copy)=default
 
- Public Member Functions inherited from ReferenceCount
int get_ref_count () const
 
WeakReferenceListget_weak_list () const
 Returns the WeakReferenceList associated with this ReferenceCount object. More...
 
bool has_weak_list () const
 Returns true if this particular ReferenceCount object has a WeakReferenceList created, false otherwise. More...
 
void local_object ()
 This function should be called, once, immediately after creating a new instance of some ReferenceCount-derived object on the stack. More...
 
void ref () const
 Explicitly increments the reference count. More...
 
bool ref_if_nonzero () const
 Atomically increases the reference count of this object if it is not zero. More...
 
bool test_ref_count_integrity () const
 Does some easy checks to make sure that the reference count isn't completely bogus. More...
 
bool test_ref_count_nonzero () const
 Does some easy checks to make sure that the reference count isn't zero, or completely bogus. More...
 
virtual bool unref () const
 Explicitly decrements the reference count. More...
 
WeakReferenceListweak_ref ()
 Adds the indicated PointerToVoid as a weak reference to this object. More...
 
void weak_unref ()
 Removes the indicated PointerToVoid as a weak reference to this object. More...
 
- Public Member Functions inherited from Namable
 Namable (const std::string &initial_name="")
 
void clear_name ()
 Resets the Namable's name to empty. More...
 
const std::string & get_name () const
 
bool has_name () const
 Returns true if the Namable has a nonempty name set, false if the name is empty. More...
 
void output (std::ostream &out) const
 Outputs the Namable. More...
 
void set_name (const std::string &name)
 
- Public Member Functions inherited from NurbsCurveInterface
int append_cv (PN_stdfloat x, PN_stdfloat y, PN_stdfloat z)
 
int append_cv (const LVecBase3 &v)
 
int append_cv (const LVecBase4 &v)
 
LVecBase3 get_cv_point (int n) const
 Returns the position of the indicated CV. More...
 
PN_stdfloat get_cv_weight (int n) const
 Returns the weight of the indicated CV. More...
 
bool set_cv_point (int n, PN_stdfloat x, PN_stdfloat y, PN_stdfloat z)
 Repositions the indicated CV. More...
 
bool set_cv_point (int n, const LVecBase3 &v)
 Repositions the indicated CV. More...
 
bool set_cv_weight (int n, PN_stdfloat w)
 Sets the weight of the indicated CV without affecting its position in 3-d space. More...
 
void write_cv (std::ostream &out, int n) const
 

Static Public Member Functions

static TypeHandle get_class_type ()
 
static void init_type ()
 
static void register_with_read_factory ()
 Initializes the factory for reading these things from Bam files. More...
 
- Static Public Member Functions inherited from PiecewiseCurve
static TypeHandle get_class_type ()
 
static void init_type ()
 
- Static Public Member Functions inherited from ParametricCurve
static TypeHandle get_class_type ()
 
static void init_type ()
 
- Static Public Member Functions inherited from PandaNode
static DrawMask get_all_camera_mask ()
 
static TypeHandle get_class_type ()
 
static DrawMask get_overall_bit ()
 
static void init_type ()
 
static PT (PandaNode) decode_from_bam_stream(vector_uchar data
 
static void register_with_read_factory ()
 Tells the BamReader how to create objects of type PandaNode. More...
 
static void reset_all_prev_transform (Thread *current_thread=Thread::get_current_thread())
 Visits all nodes in the world with the _dirty_prev_transform flag–that is, all nodes whose _prev_transform is different from the _transform in pipeline stage 0–and resets the _prev_transform to be the same as _transform. More...
 
static void set_scene_root_func (SceneRootFunc *func)
 This is used by the GraphicsEngine to hook in a pointer to the scene_root_func(), the function to determine whether the node is an active scene root. More...
 
- Static Public Member Functions inherited from TypedWritableReferenceCount
static TypeHandle get_class_type ()
 
static void init_type ()
 
static PT (TypedWritableReferenceCount) decode_from_bam_stream(vector_uchar data
 
- Static Public Member Functions inherited from TypedWritable
static bool decode_raw_from_bam_stream (TypedWritable *&ptr, ReferenceCount *&ref_ptr, vector_uchar data, BamReader *reader=nullptr)
 Reads the bytes created by a previous call to encode_to_bam_stream(), and extracts the single object on those bytes. More...
 
static TypeHandle get_class_type ()
 
static void init_type ()
 
- Static Public Member Functions inherited from TypedObject
static TypeHandle get_class_type ()
 
static void init_type ()
 This function is declared non-inline to work around a compiler bug in g++ 2.96. More...
 
- Static Public Member Functions inherited from ReferenceCount
static TypeHandle get_class_type ()
 
static void init_type ()
 
- Static Public Member Functions inherited from Namable
static TypeHandle get_class_type ()
 
static void init_type ()
 
- Static Public Member Functions inherited from NurbsCurveInterface
static TypeHandle get_class_type ()
 
static void init_type ()
 

Additional Inherited Members

- Public Types inherited from ParametricCurve
typedef pvector< BezierSegBezierSegs
 
- Public Types inherited from PandaNode
enum  FancyBits {
  FB_transform = 0x0001, FB_state = 0x0002, FB_effects = 0x0004, FB_tag = 0x0010,
  FB_draw_mask = 0x0020, FB_cull_callback = 0x0040
}
 
typedef bool SceneRootFunc(const PandaNode *)
 
enum  UnexpectedChange {
  UC_parents = 0x001, UC_children = 0x002, UC_transform = 0x004, UC_state = 0x008,
  UC_draw_mask = 0x010
}
 
- Public Attributes inherited from PandaNode
 clear_tag
 Removes the value defined for this key on this particular node. More...
 
virtual LPoint3 bool const TransformState Threadcurrent_thread = Thread::get_current_thread()) const
 
Threadcurrent_thread = Thread::get_current_thread()) const
 
virtual LPoint3 bool & found_any
 
 get_all_camera_mask
 Returns a DrawMask that is appropriate for rendering to all cameras. More...
 
 get_bounds_type
 Returns the bounding volume type set with set_bounds_type(). More...
 
 get_child
 Returns the nth child node of this node. More...
 
 get_children
 Returns an object that can be used to walk through the list of children of the node. More...
 
 get_draw_control_mask
 Returns the set of bits in draw_show_mask that are considered meaningful. More...
 
 get_draw_show_mask
 Returns the hide/show bits of this particular node. More...
 
 get_effects
 
 get_internal_bounds
 
 get_internal_vertices
 
 get_into_collide_mask
 Returns the "into" collide mask for this node. More...
 
 get_legal_collide_mask
 Returns the subset of CollideMask bits that may be set for this particular type of PandaNode. More...
 
 get_nested_vertices
 
 get_num_children
 Returns the number of child nodes this node has. More...
 
 get_num_parents
 Returns the number of parent nodes this node has. More...
 
 get_num_stashed
 Returns the number of stashed nodes this node has. More...
 
 get_num_tags
 
 get_overall_bit
 
 get_parent
 Returns the nth parent node of this node. More...
 
 get_parents
 Returns an object that can be used to walk through the list of parents of the node, similar to get_children() and get_stashed(). More...
 
 get_prev_transform
 
 get_python_tags
 
 get_stashed
 Returns the nth stashed child of this node. More...
 
 get_state
 
 get_tag
 
 get_tag_key
 
 get_transform
 
 has_tag
 
 is_bounds_stale
 
 is_final
 Returns the current state of the "final" flag. More...
 
 is_overall_hidden
 Returns true if the node has been hidden to all cameras by clearing its overall bit. More...
 
virtual LPoint3 & max_point
 
static BamReaderreader = nullptr)
 
 set_effects
 Sets the complete RenderEffects that will be applied this node. More...
 
 set_final
 
 set_into_collide_mask
 Sets the "into" CollideMask. More...
 
 set_overall_hidden
 Sets or clears the hidden flag. More...
 
 set_state
 Sets the complete RenderState that will be applied to all nodes at this level and below. More...
 
 set_tag
 Associates a user-defined value with a user-defined key which is stored on the node. More...
 
 set_transform
 Sets the transform that will be applied to this node and below. More...
 
virtual LPoint3 bool const TransformStatetransform
 
- Public Attributes inherited from TypedWritableReferenceCount
static BamReaderreader = nullptr)
 
- Public Attributes inherited from TypedObject
 get_type
 
- Public Attributes inherited from ReferenceCount
 get_ref_count
 Returns the current reference count. More...
 
- Public Attributes inherited from Namable
 get_name
 
 set_name
 
- Public Attributes inherited from NurbsCurveInterface
 get_cv
 
 get_knot
 
 get_num_cvs
 
 get_num_knots
 
- Static Public Attributes inherited from TypedWritable
static TypedWritable *const Null = nullptr
 

Detailed Description

A Nonuniform Rational B-Spline.

This class is actually implemented as a PiecewiseCurve made up of several CubicCurvesegs, each of which is created using the nurbs_basis() method. The list of CV's and knots is kept here, within the NurbsCurve class.

This class is the original Panda-native implementation of a NURBS curve. It is typedeffed as "NurbsCurve" and performs all NURBS curve functions if we do not have the NURBS++ library available.

However, if we *do* have the NURBS++ library, another class exists, the NurbsPPCurve, which is a wrapper around that library and provides some additional functionality. In that case, the other class is typedeffed to "NurbsCurve" instead of this one, and performs most of the NURBS curve functions. This class then becomes vestigial.

Definition at line 41 of file nurbsCurve.h.

Constructor & Destructor Documentation

◆ NurbsCurve() [1/2]

NurbsCurve::NurbsCurve ( const ParametricCurve pc)

Constructs a NURBS curve equivalent to the indicated (possibly non-NURBS) curve.

Definition at line 39 of file nurbsCurve.cxx.

References ParametricCurve::convert_to_nurbs().

◆ NurbsCurve() [2/2]

NurbsCurve::NurbsCurve ( int  order,
int  num_cvs,
const PN_stdfloat  knots[],
const LVecBase4  cvs[] 
)

Constructs a NURBS curve according to the indicated NURBS parameters.

Definition at line 52 of file nurbsCurve.cxx.

Member Function Documentation

◆ convert_to_nurbs()

bool NurbsCurve::convert_to_nurbs ( ParametricCurve nc) const
virtual

Stores in the indicated NurbsCurve a NURBS representation of an equivalent curve.

Returns true if successful, false otherwise.

Reimplemented from ParametricCurve.

Definition at line 434 of file nurbsCurve.cxx.

References ParametricCurve::set_curve_type().

◆ get_cv()

LVecBase4 NurbsCurve::get_cv ( int  n) const
virtual

Returns the position in homogeneous space of the indicated CV.

Implements NurbsCurveInterface.

Definition at line 221 of file nurbsCurve.cxx.

◆ get_knot()

PN_stdfloat NurbsCurve::get_knot ( int  n) const
virtual

Retrieves the value of the indicated knot.

Implements NurbsCurveInterface.

Definition at line 249 of file nurbsCurve.cxx.

Referenced by recompute().

◆ get_num_knots()

int NurbsCurve::get_num_knots ( ) const
virtual

Returns the number of knots on the curve.

Implements NurbsCurveInterface.

Definition at line 119 of file nurbsCurve.cxx.

◆ get_nurbs_interface()

NurbsCurveInterface * NurbsCurve::get_nurbs_interface ( )
virtual

Returns a pointer to the object as a NurbsCurveInterface object if it happens to be a NURBS-style curve; otherwise, returns NULL.

Reimplemented from ParametricCurve.

Definition at line 425 of file nurbsCurve.cxx.

◆ insert_cv()

bool NurbsCurve::insert_cv ( PN_stdfloat  t)
virtual

Inserts a new CV into the middle of the curve at the indicated parametric value.

This doesn't change the shape or timing of the curve; however, it is irreversible: if the new CV is immediately removed, the curve will be changed. Returns true if successful, false otherwise.

Implements NurbsCurveInterface.

Definition at line 132 of file nurbsCurve.cxx.

◆ make_copy()

PandaNode * NurbsCurve::make_copy ( ) const
virtual

Returns a newly-allocated PandaNode that is a shallow copy of this one.

It will be a different pointer, but its internal data may or may not be shared with that of the original PandaNode. No children will be copied.

Reimplemented from PandaNode.

Definition at line 83 of file nurbsCurve.cxx.

◆ rebuild_curveseg()

bool NurbsCurve::rebuild_curveseg ( int  rtype0,
PN_stdfloat  t0,
const LVecBase4 &  v0,
int  rtype1,
PN_stdfloat  t1,
const LVecBase4 &  v1,
int  rtype2,
PN_stdfloat  t2,
const LVecBase4 &  v2,
int  rtype3,
PN_stdfloat  t3,
const LVecBase4 &  v3 
)
virtual

Rebuilds the current curve segment (as selected by the most recent call to find_curve()) according to the specified properties (see CubicCurveseg::compute_seg).

Returns true if possible, false if something goes horribly wrong.

Reimplemented from PiecewiseCurve.

Definition at line 303 of file nurbsCurve.cxx.

◆ recompute()

bool NurbsCurve::recompute ( )
virtual

Recalculates the curve basis according to the latest position of the CV's, knots, etc.

Until this function is called, adjusting the NURBS parameters will have no visible effect on the curve. Returns true if the resulting curve is valid, false otherwise.

Reimplemented from ParametricCurve.

Definition at line 267 of file nurbsCurve.cxx.

References get_knot(), and PiecewiseCurve::insert_curveseg().

◆ register_with_read_factory()

void NurbsCurve::register_with_read_factory ( )
static

Initializes the factory for reading these things from Bam files.

Definition at line 487 of file nurbsCurve.cxx.

References BamReader::get_factory(), and Factory< Type >::register_factory().

◆ remove_all_cvs()

void NurbsCurve::remove_all_cvs ( )
virtual

Removes all CV's from the curve.

Implements NurbsCurveInterface.

Definition at line 201 of file nurbsCurve.cxx.

◆ remove_cv()

bool NurbsCurve::remove_cv ( int  n)
virtual

Removes the indicated CV from the curve.

Returns true if the CV index was valid, false otherwise.

Implements NurbsCurveInterface.

Definition at line 188 of file nurbsCurve.cxx.

◆ set_cv()

bool NurbsCurve::set_cv ( int  n,
const LVecBase4 &  v 
)
virtual

Repositions the indicated CV.

Returns true if successful, false otherwise.

Implements NurbsCurveInterface.

Definition at line 210 of file nurbsCurve.cxx.

◆ set_knot()

bool NurbsCurve::set_knot ( int  n,
PN_stdfloat  t 
)
virtual

Sets the value of the indicated knot.

There are get_num_cvs() + _order knot values, but the first _order - 1 and the last 1 knot values cannot be changed. It is also an error to set a knot value outside the range of its neighbors.

Implements NurbsCurveInterface.

Definition at line 235 of file nurbsCurve.cxx.

◆ set_order()

void NurbsCurve::set_order ( int  order)
virtual

Changes the order of the curve.

Must be a value from 1 to 4. Can only be done when there are no cv's.

Implements NurbsCurveInterface.

Definition at line 92 of file nurbsCurve.cxx.

◆ stitch()

bool NurbsCurve::stitch ( const ParametricCurve a,
const ParametricCurve b 
)
virtual

Regenerates this curve as one long curve: the first curve connected end-to- end with the second one.

Either a or b may be the same as 'this'.

Returns true if successful, false on failure or if the curve type does not support stitching.

Reimplemented from ParametricCurve.

Definition at line 374 of file nurbsCurve.cxx.


The documentation for this class was generated from the following files: