--- /dev/null
+/*! ========================================================================
+** Extended Template Library
+** Hermite Template Class Implementation
+** $Id$
+**
+** Copyright (c) 2002 Robert B. Quattlebaum Jr.
+**
+** This package is free software; you can redistribute it and/or
+** modify it under the terms of the GNU General Public License as
+** published by the Free Software Foundation; either version 2 of
+** the License, or (at your option) any later version.
+**
+** This package is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+** General Public License for more details.
+**
+** === N O T E S ===========================================================
+**
+** This is an internal header file, included by other ETL headers.
+** You should not attempt to use it directly.
+**
+** ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __ETL__HERMITE_H
+#define __ETL__HERMITE_H
+
+/* === H E A D E R S ======================================================= */
+
+#include "bezier"
+
+/* === M A C R O S ========================================================= */
+
+/* === T Y P E D E F S ===================================================== */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+_ETL_BEGIN_NAMESPACE
+
+/*
+template <typename T>
+class hermite_base : std::unary_function<float,T>
+{
+public:
+ typedef T value_type;
+ typedef float time_type;
+private:
+ affine_combo<value_type,time_type> affine_func;
+ value_type a,b,c,d;
+ time_type r,s;
+
+ value_type _coeff[3];
+ time_type drs; // reciprocal of (s-r)
+public:
+ hermite_base():r(0.0),s(1.0) { drs=1.0/(s-r); }
+ hermite_base(
+ const value_type &a, const value_type &b, const value_type &c, const value_type &d,
+ const time_type &r=0.0, const time_type &s=1.0):
+ a(a),b(b),c(c),d(d),r(r),s(s) { sync(); }
+
+ void sync(void)
+ {
+ drs=1.0/(s-r);
+ _coeff[0]= c;
+ _coeff[1]=-d*1 - c*2 + b*3 - a*3;
+ _coeff[2]= d*1 + c*1 - b*2 + a*2;
+ }
+
+ inline value_type
+ operator()(time_type t)const
+ { t-=r; t*=drs; return a + (_coeff[0]+(_coeff[1]+(_coeff[2])*t)*t)*t; }
+
+ void set_rs(time_type new_r, time_type new_s) { r=new_r; s=new_s; drs=1.0/(s-r); }
+ void set_r(time_type new_r) { r=new_r; drs=1.0/(s-r); }
+ void set_s(time_type new_s) { s=new_s; drs=1.0/(s-r); }
+ const time_type &get_r(void)const { return r; }
+ const time_type &get_s(void)const { return s; }
+ time_type get_dt(void)const { return s-r; }
+
+ value_type &
+ operator[](int i)
+ { return (&a)[i]; }
+
+ const value_type &
+ operator[](int i) const
+ { return (&a)[i]; }
+};
+
+
+template <typename T>
+class hermite : public hermite_base<T>
+{
+public:
+ typedef T value_type;
+ typedef float time_type;
+
+
+
+public:
+ hermite() { }
+ hermite(const value_type &p1, const value_type &p2, const value_type &t1, const value_type &t2):
+ P1(p1),P2(p2),T1(t1),T2(t2) { sync(); }
+ hermite(const value_type &p1, const value_type &p2):
+ P1(p1),P2(p2),T1(p2-p1),T2(p2-p1) { sync(); }
+
+ value_type P1,P2,T1,T2;
+
+ value_type &p1(void) { return P1; }
+ value_type &p2(void) { return P2; }
+ value_type &t1(void) { return T1; }
+ value_type &t2(void) { return T2; }
+
+ void sync(void)
+ {
+// hermite_base<T>::operator[](0)=P1;
+// bezier<T>::operator[](1)=P1+T1/3;
+// bezier<T>::operator[](2)=P2-T2/3;
+// bezier<T>::operator[](3)=P2;
+
+ hermite_base<T>::operator[](0)=P1;
+ hermite_base<T>::operator[](1)=P2;
+ hermite_base<T>::operator[](2)=T1;
+ hermite_base<T>::operator[](3)=T2;
+
+ hermite_base<T>::sync();
+ }
+
+};
+
+*/
+
+template <typename V,typename T=float>
+class hermite : public bezier<V,T>
+{
+public:
+ typedef V value_type;
+ typedef T time_type;
+
+
+
+public:
+ hermite() { }
+ hermite(const value_type &p1, const value_type &p2, const value_type &t1, const value_type &t2):
+ P1(p1),P2(p2),T1(t1),T2(t2) { sync(); }
+ hermite(const value_type &p1, const value_type &p2):
+ P1(p1),P2(p2),T1(p2-p1),T2(p2-p1) { sync(); }
+
+ value_type P1,P2,T1,T2;
+
+ value_type &p1() { return P1; }
+ value_type &p2() { return P2; }
+ value_type &t1() { return T1; }
+ value_type &t2() { return T2; }
+
+ void sync()
+ {
+ bezier<V,T>::operator[](0)=P1;
+ bezier<V,T>::operator[](1)=P1+T1/3;
+ bezier<V,T>::operator[](2)=P2-T2/3;
+ bezier<V,T>::operator[](3)=P2;
+
+ bezier<V,T>::sync();
+ }
+};
+
+_ETL_END_NAMESPACE
+
+/* === E X T E R N S ======================================================= */
+
+/* === E N D =============================================================== */
+
+#endif
projects / synfig.git / blobdiff