ParametricCurve

from panda3d.core import ParametricCurve
class ParametricCurve

Bases: PandaNode

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()].

Inheritance diagram

Inheritance diagram of ParametricCurve

__init__(*args, **kwargs)
adjustPoint()

C++ Interface: adjust_point(const ParametricCurve self, float t, float px, float py, float 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.

*/

adjustPt()

C++ Interface: adjust_pt(const ParametricCurve self, float t, float px, float py, float pz, float tx, float ty, float tz)

/**

  • Recomputes the curve such that it passes through the point (px, py, pz)

  • with the tangent (tx, ty, tz).

*/

adjustTangent()

C++ Interface: adjust_tangent(const ParametricCurve self, float t, float tx, float ty, float tz)

/**

  • Recomputes the curve such that it has the tangent (tx, ty, tz) at time t,

  • but keeps the same position at the point.

*/

adjust_point()

C++ Interface: adjust_point(const ParametricCurve self, float t, float px, float py, float 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.

*/

adjust_pt()

C++ Interface: adjust_pt(const ParametricCurve self, float t, float px, float py, float pz, float tx, float ty, float tz)

/**

  • Recomputes the curve such that it passes through the point (px, py, pz)

  • with the tangent (tx, ty, tz).

*/

adjust_tangent()

C++ Interface: adjust_tangent(const ParametricCurve self, float t, float tx, float ty, float tz)

/**

  • Recomputes the curve such that it has the tangent (tx, ty, tz) at time t,

  • but keeps the same position at the point.

*/

calcLength()

C++ Interface: calc_length(ParametricCurve self) calc_length(ParametricCurve self, float from, float to)

/**

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

*/

/**

  • Approximates the length of the curve segment from parametric time ‘from’ to

  • time ‘to’.

*/

calc_length()

C++ Interface: calc_length(ParametricCurve self) calc_length(ParametricCurve self, float from, float to)

/**

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

*/

/**

  • Approximates the length of the curve segment from parametric time ‘from’ to

  • time ‘to’.

*/

findLength()

C++ Interface: find_length(ParametricCurve self, float start_t, float length_offset)

/**

  • 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.

*/

find_length()

C++ Interface: find_length(ParametricCurve self, float start_t, float length_offset)

/**

  • 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.

*/

get2ndtangent()

C++ Interface: get_2ndtangent(ParametricCurve self, float t, LVecBase3f tangent2)

getClassType()

C++ Interface: get_class_type()

getCurveType()

C++ Interface: get_curve_type(ParametricCurve self)

/**

  • Returns the flag indicating the use to which the curve is intended to be

  • put.

*/

getMaxT()

C++ Interface: get_max_t(ParametricCurve self)

/**

  • 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.

*/

getNumDimensions()

C++ Interface: get_num_dimensions(ParametricCurve self)

/**

  • 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.

*/

getPoint()

C++ Interface: get_point(ParametricCurve self, float t, LVecBase3f point)

getPt()

C++ Interface: get_pt(ParametricCurve self, float t, LVecBase3f point, LVecBase3f tangent)

getTangent()

C++ Interface: get_tangent(ParametricCurve self, float t, LVecBase3f tangent)

get_2ndtangent()

C++ Interface: get_2ndtangent(ParametricCurve self, float t, LVecBase3f tangent2)

get_class_type()

C++ Interface: get_class_type()

get_curve_type()

C++ Interface: get_curve_type(ParametricCurve self)

/**

  • Returns the flag indicating the use to which the curve is intended to be

  • put.

*/

get_max_t()

C++ Interface: get_max_t(ParametricCurve self)

/**

  • 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.

*/

get_num_dimensions()

C++ Interface: get_num_dimensions(ParametricCurve self)

/**

  • 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.

*/

get_point()

C++ Interface: get_point(ParametricCurve self, float t, LVecBase3f point)

get_pt()

C++ Interface: get_pt(ParametricCurve self, float t, LVecBase3f point, LVecBase3f tangent)

get_tangent()

C++ Interface: get_tangent(ParametricCurve self, float t, LVecBase3f tangent)

isValid()

C++ Interface: is_valid(ParametricCurve self)

/**

  • Returns true if the curve is defined. This base class function always

  • returns true; derived classes might override this to sometimes return

  • false.

*/

is_valid()

C++ Interface: is_valid(ParametricCurve self)

/**

  • Returns true if the curve is defined. This base class function always

  • returns true; derived classes might override this to sometimes return

  • false.

*/

recompute()

C++ Interface: recompute(const ParametricCurve self)

/**

  • Recalculates the curve, if necessary. Returns true if the resulting curve

  • is valid, false otherwise.

*/

setCurveType()

C++ Interface: set_curve_type(const ParametricCurve self, 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.

*/

setNumDimensions()

C++ Interface: set_num_dimensions(const ParametricCurve self, 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.

*/

set_curve_type()

C++ Interface: set_curve_type(const ParametricCurve self, 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.

*/

set_num_dimensions()

C++ Interface: set_num_dimensions(const ParametricCurve self, 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.

*/

stitch()

C++ Interface: stitch(const ParametricCurve self, const ParametricCurve a, const ParametricCurve b)

/**

  • 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.

*/

writeEgg()

C++ Interface: write_egg(const ParametricCurve self, Filename filename) write_egg(const ParametricCurve self, Filename filename, int cs) write_egg(const ParametricCurve self, ostream out, const Filename filename, int cs)

/**

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

  • Returns true if the file is successfully written.

*/

/**

  • Writes an egg description of the nurbs curve to the specified output

  • stream. Returns true if the file is successfully written.

*/

write_egg()

C++ Interface: write_egg(const ParametricCurve self, Filename filename) write_egg(const ParametricCurve self, Filename filename, int cs) write_egg(const ParametricCurve self, ostream out, const Filename filename, int cs)

/**

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

  • Returns true if the file is successfully written.

*/

/**

  • Writes an egg description of the nurbs curve to the specified output

  • stream. Returns true if the file is successfully written.

*/