Panda3D
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ParametricCurve Class Referenceabstract

A virtual base class for parametric curves. More...

#include "parametricCurve.h"

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

Classes

struct  BezierSeg
 

Public Types

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 Member Functions

 ParametricCurve ()
 This is a virtual base class. More...
 
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...
 
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...
 
virtual bool convert_to_nurbs (ParametricCurve *nc) const
 Stores in the indicated NurbsCurve a NURBS representation of an equivalent curve. 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 TypeHandle force_init_type ()
 
virtual bool get_2ndtangent (PN_stdfloat t, LVecBase3 &tangent2) const =0
 
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...
 
virtual bool get_bezier_segs (BezierSegs &) const
 Fills up the indicated vector with a list of BezierSeg structs that describe the curve. More...
 
int get_curve_type () const
 Returns the flag indicating the use to which the curve is intended to be put. More...
 
virtual PN_stdfloat get_max_t () const
 Returns the upper bound of t for the entire curve. 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...
 
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 bool get_point (PN_stdfloat t, LVecBase3 &point) const =0
 
virtual bool get_pt (PN_stdfloat t, LVecBase3 &point, LVecBase3 &tangent) const =0
 
virtual bool get_tangent (PN_stdfloat t, LVecBase3 &tangent) const =0
 
virtual TypeHandle get_type () const
 
virtual bool is_valid () const
 Returns true if the curve is defined. More...
 
virtual bool recompute ()
 Recalculates the curve, if necessary. 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...
 
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...
 
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 (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 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 string &key, Thread *current_thread=Thread::get_current_thread())
 Removes the value defined for this key on this particular node. More...
 
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
 Returns the bounding volume type set with set_bounds_type(). More...
 
PandaNodeget_child (int n, Thread *current_thread=Thread::get_current_thread()) const
 Returns the nth child node of this node. More...
 
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
 Returns an object that can be used to walk through the list of children of the node. More...
 
DrawMask get_draw_control_mask () const
 Returns the set of bits in draw_show_mask that are considered meaningful. More...
 
DrawMask get_draw_show_mask () const
 Returns the hide/show bits of this particular node. More...
 
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
 Returns the "into" collide mask for this node. More...
 
virtual CollideMask get_legal_collide_mask () const
 Returns the subset of CollideMask bits that may be set for this particular type of PandaNode. More...
 
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
 Returns the number of child nodes this node has. More...
 
int get_num_parents (Thread *current_thread=Thread::get_current_thread()) const
 Returns the number of parent nodes this node has. More...
 
int get_num_stashed (Thread *current_thread=Thread::get_current_thread()) const
 Returns the number of stashed nodes this node has. More...
 
PandaNodeget_parent (int n, Thread *current_thread=Thread::get_current_thread()) const
 Returns the nth parent node of this node. More...
 
Parents get_parents (Thread *current_thread=Thread::get_current_thread()) const
 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...
 
PandaNodeget_stashed (int n, Thread *current_thread=Thread::get_current_thread()) const
 Returns the nth stashed child of this node. More...
 
Stashed get_stashed (Thread *current_thread=Thread::get_current_thread()) const
 Returns an object that can be used to walk through the list of children of the node. More...
 
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...
 
string get_tag (const string &key, Thread *current_thread=Thread::get_current_thread()) 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 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
 Returns the current state of the "final" flag. More...
 
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
 Returns true if the node has been hidden to all cameras by clearing its overall bit. More...
 
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 (ostream &out, const string &separator="\) const
 Writes a list of all the tag keys assigned to the node to the indicated stream. More...
 
void ls (ostream &out, int indent_level) const
 
virtual PandaNodemake_copy () const
 Returns a newly-allocated PandaNode that is a shallow copy of this one. More...
 
 MAKE_SEQ (get_parents, get_num_parents, get_parent)
 
 MAKE_SEQ (get_children, get_num_children, get_child)
 
 MAKE_SEQ (get_stashed, get_num_stashed, get_stashed)
 
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 (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())
 Sets the complete RenderEffects that will be applied this node. More...
 
void set_final (bool flag)
 
void set_into_collide_mask (CollideMask mask)
 Sets the "into" CollideMask. More...
 
void set_overall_hidden (bool overall_hidden)
 Sets or clears the hidden flag. More...
 
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())
 Sets the complete RenderState that will be applied to all nodes at this level and below. More...
 
void set_tag (const string &key, const string &value, Thread *current_thread=Thread::get_current_thread())
 Associates a user-defined value with a user-defined key which is stored on the node. More...
 
void set_transform (const TransformState *transform, Thread *current_thread=Thread::get_current_thread())
 Sets the transform that will be applied to this node and below. More...
 
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...
 
virtual void write (ostream &out, int indent_level) const
 
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)
 
virtual int complete_pointers (TypedWritable **p_list, BamReader *manager)
 Receives an array of pointers, one for each time manager->read_pointer() was called in fillin(). More...
 
string encode_to_bam_stream () const
 Converts the TypedWritable object into a single stream of data using a BamWriter, and returns that data as a string string. More...
 
bool encode_to_bam_stream (string &data, BamWriter *writer=NULL) 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)
 
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...
 
void operator= (const TypedObject &copy)
 
- Public Member Functions inherited from ReferenceCount
int get_ref_count () const
 Returns the current reference count. More...
 
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 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...
 
void weak_ref (WeakPointerToVoid *ptv)
 Adds the indicated PointerToVoid as a weak reference to this object. More...
 
void weak_unref (WeakPointerToVoid *ptv)
 Removes the indicated PointerToVoid as a weak reference to this object. More...
 
- Public Member Functions inherited from Namable
 Namable (const string &initial_name="")
 
 Namable (const Namable &copy)
 
void clear_name ()
 Resets the Namable's name to empty. More...
 
const 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...
 
Namableoperator= (const Namable &other)
 
void output (ostream &out) const
 Outputs the Namable. More...
 
void set_name (const string &name)
 

Static Public Member Functions

static TypeHandle get_class_type ()
 
static void init_type ()
 
- Static Public Member Functions inherited from PandaNode
static DrawMask get_all_camera_mask ()
 Returns a DrawMask that is appropriate for rendering to all cameras. More...
 
static TypeHandle get_class_type ()
 
static DrawMask get_overall_bit ()
 
static void init_type ()
 
static PT (PandaNode) decode_from_bam_stream(const string &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(const string &data
 
- Static Public Member Functions inherited from TypedWritable
static bool decode_raw_from_bam_stream (TypedWritable *&ptr, ReferenceCount *&ref_ptr, const string &data, BamReader *reader=NULL)
 Reads the string created by a previous call to encode_to_bam_stream(), and extracts the single object on that string. 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 ()
 

Additional Inherited Members

- Public Attributes inherited from PandaNode
virtual LPoint3 bool const TransformState Threadcurrent_thread = Thread::get_current_thread()) const
 
Threadcurrent_thread = Thread::get_current_thread()) const
 
virtual LPoint3 bool & found_any
 
virtual LPoint3max_point
 
static BamReaderreader = NULL)
 
virtual LPoint3 bool const TransformState * transform
 
- Public Attributes inherited from TypedWritableReferenceCount
static BamReaderreader = NULL)
 
- Static Public Attributes inherited from TypedWritable
static TypedWritable *const Null = (TypedWritable*)0L
 

Detailed Description

A virtual base class for parametric curves.

This encapsulates all curves in 3-d space defined for a single parameter t in the range [0,get_max_t()].

Definition at line 60 of file parametricCurve.h.

Constructor & Destructor Documentation

◆ ParametricCurve()

ParametricCurve::ParametricCurve ( )

This is a virtual base class.

Don't try to construct one from Scheme.

Definition at line 38 of file parametricCurve.cxx.

References safe_to_flatten().

Member Function Documentation

◆ adjust_point()

bool ParametricCurve::adjust_point ( PN_stdfloat  t,
PN_stdfloat  px,
PN_stdfloat  py,
PN_stdfloat  pz 
)
virtual

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.

Reimplemented in PiecewiseCurve.

Definition at line 300 of file parametricCurve.cxx.

References adjust_tangent().

Referenced by ParametricCurveCollection::adjust_hpr(), ParametricCurveCollection::adjust_xyz(), and find_length().

◆ adjust_pt()

bool ParametricCurve::adjust_pt ( PN_stdfloat  t,
PN_stdfloat  px,
PN_stdfloat  py,
PN_stdfloat  pz,
PN_stdfloat  tx,
PN_stdfloat  ty,
PN_stdfloat  tz 
)
virtual

Recomputes the curve such that it passes through the point (px, py, pz) with the tangent (tx, ty, tz).

Reimplemented in PiecewiseCurve.

Definition at line 323 of file parametricCurve.cxx.

References recompute().

Referenced by adjust_tangent().

◆ adjust_tangent()

bool ParametricCurve::adjust_tangent ( PN_stdfloat  t,
PN_stdfloat  tx,
PN_stdfloat  ty,
PN_stdfloat  tz 
)
virtual

Recomputes the curve such that it has the tangent (tx, ty, tz) at time t, but keeps the same position at the point.

Reimplemented in PiecewiseCurve.

Definition at line 312 of file parametricCurve.cxx.

References adjust_pt().

Referenced by adjust_point().

◆ calc_length() [1/2]

PN_stdfloat ParametricCurve::calc_length ( ) const

Approximates the length of the entire curve to within a few decimal places.

Definition at line 194 of file parametricCurve.cxx.

References get_max_t().

Referenced by get_num_dimensions(), and ParametricCurveCollection::make_even().

◆ calc_length() [2/2]

PN_stdfloat ParametricCurve::calc_length ( PN_stdfloat  from,
PN_stdfloat  to 
) const

Approximates the length of the curve segment from parametric time 'from' to time 'to'.

Definition at line 205 of file parametricCurve.cxx.

References find_length().

◆ convert_to_hermite()

bool ParametricCurve::convert_to_hermite ( HermiteCurve hc) const
virtual

◆ convert_to_nurbs()

bool ParametricCurve::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 in NurbsCurve.

Definition at line 576 of file parametricCurve.cxx.

References get_bezier_segs(), get_nurbs_interface(), recompute(), register_drawer(), and set_curve_type().

Referenced by convert_to_hermite(), and NurbsCurve::NurbsCurve().

◆ find_length()

PN_stdfloat ParametricCurve::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.

This is the inverse of calc_length(): rather than determining the length along the curve between two parametric points, it determines the position in parametric time of a point n units along the curve.

The search distance must not be negative.

Definition at line 253 of file parametricCurve.cxx.

References adjust_point(), and get_max_t().

Referenced by calc_length(), and ParametricCurveCollection::make_even().

◆ get_bezier_seg()

bool ParametricCurve::get_bezier_seg ( ParametricCurve::BezierSeg ) const
virtual

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.

Returns true if successful, false otherwise.

Reimplemented in CubicCurveseg.

Definition at line 479 of file parametricCurve.cxx.

References get_nurbs_interface().

Referenced by get_bezier_segs().

◆ get_bezier_segs()

bool ParametricCurve::get_bezier_segs ( ParametricCurve::BezierSegs ) const
virtual

Fills up the indicated vector with a list of BezierSeg structs that describe the curve.

This assumes the curve is a PiecewiseCurve of CubicCurvesegs. Returns true if successful, false otherwise.

Reimplemented in PiecewiseCurve.

Definition at line 466 of file parametricCurve.cxx.

References get_bezier_seg().

Referenced by convert_to_hermite(), convert_to_nurbs(), and write_egg().

◆ get_curve_type()

int ParametricCurve::get_curve_type ( ) const

◆ get_max_t()

PN_stdfloat ParametricCurve::get_max_t ( ) const
virtual

Returns the upper bound of t for the entire curve.

The curve is defined in the range 0.0f <= t <= get_max_t(). This base class function always returns 1.0f; derived classes might override this to return something else.

Reimplemented in PiecewiseCurve.

Definition at line 107 of file parametricCurve.cxx.

References set_curve_type().

Referenced by calc_length(), find_length(), is_valid(), and ParametricCurveCollection::make_even().

◆ get_num_dimensions()

int ParametricCurve::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().

This is only a hint as to how the curve is intended to be used; the actual number of dimensions of any curve is always three.

Definition at line 182 of file parametricCurve.cxx.

References calc_length().

Referenced by set_num_dimensions().

◆ get_nurbs_interface()

NurbsCurveInterface * ParametricCurve::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 in NurbsCurve.

Definition at line 491 of file parametricCurve.cxx.

References convert_to_hermite().

Referenced by convert_to_nurbs(), get_bezier_seg(), and NurbsCurveInterface::set_cv_weight().

◆ is_valid()

bool ParametricCurve::is_valid ( ) const
virtual

Returns true if the curve is defined.

This base class function always returns true; derived classes might override this to sometimes return false.

Reimplemented in PiecewiseCurve.

Definition at line 92 of file parametricCurve.cxx.

References get_max_t().

Referenced by recompute(), and safe_to_transform().

◆ recompute()

bool ParametricCurve::recompute ( )
virtual

Recalculates the curve, if necessary.

Returns true if the resulting curve is valid, false otherwise.

Reimplemented in NurbsCurve.

Definition at line 335 of file parametricCurve.cxx.

References is_valid(), and stitch().

Referenced by adjust_pt(), convert_to_nurbs(), ParametricCurveCollection::recompute(), and NurbsCurveInterface::set_cv_weight().

◆ register_drawer()

void ParametricCurve::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.

This is called automatically by the ParametricCurveDrawer.

Any number of Drawers may be registered with a particular curve.

Definition at line 640 of file parametricCurve.cxx.

References unregister_drawer().

Referenced by convert_to_nurbs(), ParametricCurveCollection::register_drawer(), and ParametricCurveCollection::unregister_drawer().

◆ safe_to_flatten()

bool ParametricCurve::safe_to_flatten ( ) const
virtual

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).

Reimplemented from PandaNode.

Definition at line 67 of file parametricCurve.cxx.

References safe_to_transform().

Referenced by ParametricCurve().

◆ safe_to_transform()

bool ParametricCurve::safe_to_transform ( ) const
virtual

Returns true if it is generally safe to transform this particular kind of PandaNode by calling the xform() method, false otherwise.

For instance, it's usually a bad idea to attempt to xform a Character.

Reimplemented from PandaNode.

Definition at line 80 of file parametricCurve.cxx.

References is_valid().

Referenced by safe_to_flatten().

◆ set_curve_type()

void ParametricCurve::set_curve_type ( int  type)

Sets the flag indicating the use to which the curve is intended to be put.

This flag is optional and only serves to provide a hint to the egg reader and writer code; it has no effect on the curve's behavior.

Setting the curve type also sets the num_dimensions to 3 or 1 according to the type.

THis flag may have one of the values PCT_XYZ, PCT_HPR, or PCT_T.

Definition at line 128 of file parametricCurve.cxx.

References get_curve_type().

Referenced by CurveFitter::compute_tangents(), convert_to_hermite(), NurbsCurve::convert_to_nurbs(), convert_to_nurbs(), get_max_t(), ParametricCurveCollection::make_even(), and ParametricCurveCollection::stitch().

◆ set_num_dimensions()

void ParametricCurve::set_num_dimensions ( int  num)

Specifies the number of significant dimensions in the curve's vertices.

This should be one of 1, 2, or 3. Normally, XYZ and HPR curves have three dimensions; time curves should always have one dimension. This only serves as a hint to the mopath editor, and also controls how the curve is written out.

Definition at line 168 of file parametricCurve.cxx.

References get_num_dimensions().

Referenced by get_curve_type().

◆ stitch()

bool ParametricCurve::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 in NurbsCurve.

Definition at line 350 of file parametricCurve.cxx.

References write_egg().

Referenced by recompute().

◆ unregister_drawer()

void ParametricCurve::unregister_drawer ( ParametricCurveDrawer *  drawer)

Removes a previously registered drawer from the list of automatically-refreshed drawers.

This is called automatically by the ParametricCurveDrawer.

Definition at line 652 of file parametricCurve.cxx.

References Datagram::add_int8(), DatagramIterator::get_int8(), and PandaNode::write_datagram().

Referenced by register_drawer(), and ParametricCurveCollection::unregister_drawer().

◆ write_egg() [1/2]

bool ParametricCurve::write_egg ( Filename  filename,
CoordinateSystem  cs = CS_default 
)

Writes an egg description of the nurbs curve to the specified output file.

Returns true if the file is successfully written.

Definition at line 365 of file parametricCurve.cxx.

References Filename::open_write(), and Filename::set_text().

Referenced by stitch(), and ParametricCurveCollection::write_egg().

◆ write_egg() [2/2]

bool ParametricCurve::write_egg ( ostream &  out,
const Filename filename,
CoordinateSystem  cs 
)

Writes an egg description of the nurbs curve to the specified output stream.

Returns true if the file is successfully written.

Definition at line 385 of file parametricCurve.cxx.

References Filename::get_basename_wo_extension(), get_bezier_segs(), get_curve_type(), and Namable::has_name().


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