--- /dev/null
+/* === S Y N F I G ========================================================= */
+/*! \file vector.h
+** \brief Various discreet type definitions
+**
+** $Id$
+**
+** \legal
+** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+** Copyright (c) 2007 Chris Moore
+**
+** 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.
+** \endlegal
+*/
+/* ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __SYNFIG_VECTOR_H
+#define __SYNFIG_VECTOR_H
+
+/* === H E A D E R S ======================================================= */
+
+#include "angle.h"
+#include "real.h"
+#include <math.h>
+
+/* === M A C R O S ========================================================= */
+
+
+#ifdef WIN32
+#include <float.h>
+#ifndef isnan
+extern "C" { int _isnan(double x); }
+#define isnan _isnan
+#endif
+#endif
+
+// For some reason isnan() isn't working on macosx any more.
+// This is a quick fix.
+#if defined(__APPLE__) && !defined(SYNFIG_ISNAN_FIX)
+#ifdef isnan
+#undef isnan
+#endif
+inline bool isnan(double x) { return x != x; }
+inline bool isnan(float x) { return x != x; }
+#define SYNFIG_ISNAN_FIX 1
+#endif
+
+
+/* === T Y P E D E F S ===================================================== */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+namespace synfig {
+
+/*! \class Vector
+** \todo writeme
+*/
+class Vector
+{
+public:
+ typedef Real value_type;
+
+private:
+ value_type _x, _y;
+
+public:
+ Vector(): _x(0.0), _y(0.0) { };
+ Vector(const value_type &x, const value_type &y):_x(x),_y(y) { };
+
+ bool is_valid()const { return !(isnan(_x) || isnan(_y)); }
+
+ value_type &
+ operator[](const int& i)
+ { return i?_y:_x; }
+
+ const value_type &
+ operator[](const int& i) const
+ { return i?_y:_x; }
+
+ const Vector &
+ operator+=(const Vector &rhs)
+ {
+ _x+=rhs._x;
+ _y+=rhs._y;
+ return *this;
+ }
+
+ const Vector &
+ operator-=(const Vector &rhs)
+ {
+ _x-=rhs._x;
+ _y-=rhs._y;
+ return *this;
+ }
+
+ const Vector &
+ operator*=(const value_type &rhs)
+ {
+ _x*=rhs;
+ _y*=rhs;
+ return *this;
+ }
+
+ const Vector &
+ operator/=(const value_type &rhs)
+ {
+ value_type tmp=1.0/rhs;
+ _x*=tmp;
+ _y*=tmp;
+ return *this;
+ }
+
+ Vector
+ operator+(const Vector &rhs)const
+ { return Vector(*this)+=rhs; }
+
+ Vector
+ operator-(const Vector &rhs)const
+ { return Vector(*this)-=rhs; }
+
+ Vector
+ operator*(const value_type &rhs)const
+ { return Vector(*this)*=rhs; }
+
+ Vector
+ operator/(const value_type &rhs)const
+ { return Vector(*this)/=rhs; }
+
+ Vector
+ operator-()const
+ { return Vector(-_x,-_y); }
+
+ value_type
+ operator*(const Vector &rhs)const
+ { return _x*rhs._x+_y*rhs._y; }
+
+ bool
+ operator==(const Vector &rhs)const
+ { return _x==rhs._x && _y==rhs._y; }
+
+ bool
+ operator!=(const Vector &rhs)const
+ { return _y!=rhs._y || _x!=rhs._x; }
+
+ //! Returns the squared magnitude of the vector
+ value_type mag_squared()const
+ { return _x*_x+_y*_y; }
+
+ //! Returns the magnitude of the vector
+ value_type mag()const
+ { return sqrt(mag_squared()); }
+
+ //! Returns the reciprocal of the magnitude of the vector
+ value_type inv_mag()const
+ { return 1.0/sqrt(mag_squared()); }
+
+ //! Returns a normalized version of the vector
+ Vector norm()const
+ { return (*this)*inv_mag(); }
+
+ //! Returns a perpendicular version of the vector
+ Vector perp()const
+ { return Vector(_y,-_x); }
+
+ Angle angle()const
+ { return Angle::rad(atan2(_y, _x)); }
+
+ bool is_equal_to(const Vector& rhs)const
+ {
+ static const value_type epsilon(0.0000000000001);
+// return (_x>rhs._x)?_x-rhs._x<=epsilon:rhs._x-_x<=epsilon && (_y>rhs._y)?_y-rhs._y<=epsilon:rhs._y-_y<=epsilon;
+ return (*this-rhs).mag_squared()<=epsilon;
+ }
+
+ static const Vector zero() { return Vector(0,0); }
+};
+
+/*! \typedef Point
+** \todo writeme
+*/
+typedef Vector Point;
+
+
+
+}; // END of namespace synfig
+
+namespace std {
+
+inline synfig::Vector::value_type
+abs(const synfig::Vector &rhs)
+ { return rhs.mag(); }
+
+}; // END of namespace std
+
+#include <ETL/bezier>
+
+_ETL_BEGIN_NAMESPACE
+
+template <>
+class bezier_base<synfig::Vector,float> : public std::unary_function<float,synfig::Vector>
+{
+public:
+ typedef synfig::Vector value_type;
+ typedef float time_type;
+private:
+
+ bezier_base<synfig::Vector::value_type,time_type> bezier_x,bezier_y;
+
+ value_type a,b,c,d;
+
+protected:
+ affine_combo<value_type,time_type> affine_func;
+
+public:
+ bezier_base() { }
+ bezier_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) { set_rs(r,s); sync(); }
+
+ void sync()
+ {
+ bezier_x[0]=a[0],bezier_y[0]=a[1];
+ bezier_x[1]=b[0],bezier_y[1]=b[1];
+ bezier_x[2]=c[0],bezier_y[2]=c[1];
+ bezier_x[3]=d[0],bezier_y[3]=d[1];
+ bezier_x.sync();
+ bezier_y.sync();
+ }
+
+ value_type
+ operator()(time_type t)const
+ {
+ return synfig::Vector(bezier_x(t),bezier_y(t));
+ }
+
+ void evaluate(time_type t, value_type &f, value_type &df) const
+ {
+ t=(t-get_r())/get_dt();
+
+ const value_type p1 = affine_func(
+ affine_func(a,b,t),
+ affine_func(b,c,t)
+ ,t);
+ const value_type p2 = affine_func(
+ affine_func(b,c,t),
+ affine_func(c,d,t)
+ ,t);
+
+ f = affine_func(p1,p2,t);
+ df = (p2-p1)*3;
+ }
+
+ void set_rs(time_type new_r, time_type new_s) { bezier_x.set_rs(new_r,new_s); bezier_y.set_rs(new_r,new_s); }
+ void set_r(time_type new_r) { bezier_x.set_r(new_r); bezier_y.set_r(new_r); }
+ void set_s(time_type new_s) { bezier_x.set_s(new_s); bezier_y.set_s(new_s); }
+ const time_type &get_r()const { return bezier_x.get_r(); }
+ const time_type &get_s()const { return bezier_x.get_s(); }
+ time_type get_dt()const { return bezier_x.get_dt(); }
+
+ value_type &
+ operator[](int i)
+ { return (&a)[i]; }
+
+ const value_type &
+ operator[](int i) const
+ { return (&a)[i]; }
+
+ //! Bezier curve intersection function
+ time_type intersect(const bezier_base<value_type,time_type> &/*x*/, time_type /*near*/=0.0)const
+ {
+ return 0;
+ }
+};
+
+_ETL_END_NAMESPACE
+
+
+/* === E N D =============================================================== */
+
+#endif
projects / synfig.git / blobdiff