X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2F3dengfx%2Fsrc%2Fgfx%2Fcurves.hpp;fp=src%2F3dengfx%2Fsrc%2Fgfx%2Fcurves.hpp;h=0d0887ac8985cfc352ecc768c56ff84f439239b7;hb=6e23259dbabaeb1711a2a5ca25b9cb421f693759;hp=0000000000000000000000000000000000000000;hpb=fe068fa879814784c45e0cb2e65dac489e8f5594;p=summerhack

diff --git a/src/3dengfx/src/gfx/curves.hpp b/src/3dengfx/src/gfx/curves.hpp
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+/*
+This file is part of the 3dengfx, realtime visualization system.
+Copyright (c) 2004, 2005 John Tsiombikas <nuclear@siggraph.org>
+
+the 3dengfx library 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.
+
+the 3dengfx library 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.
+
+You should have received a copy of the GNU General Public License
+along with the 3dengfx library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/* 3D Curves
+ * 
+ * author: John Tsiombikas 2003
+ * modified:
+ * 		John Tsiombikas 2004, 2005, 2006
+ * 		Mihalis Georgoulopoulos 2004
+ */
+
+#ifndef _CURVES_HPP_
+#define _CURVES_HPP_
+
+#include "3dengfx_config.h"
+
+#include <string>
+#include "n3dmath2/n3dmath2.hpp"
+#include "common/linkedlist.hpp"
+
+
+class Curve {
+protected:
+	LinkedList<Vector3> control_points;
+	Vector2 *samples;	// used for parametrizing by arc length
+	int sample_count;
+	bool arc_parametrize;
+
+	Curve *ease_curve;	// ease in/out curve (1D, x&z discarded)
+	int ease_sample_count, ease_step;
+	
+	void sample_arc_lengths();
+	scalar_t parametrize(scalar_t t) const;
+	scalar_t ease(scalar_t t) const;
+
+	Vector3 (*xform_cv)(const Vector3 &pt);
+	
+	virtual Vector3 interpolate(scalar_t t) const = 0;
+
+public:
+	std::string name;
+
+	Curve();
+	virtual ~Curve();
+	virtual void add_control_point(const Vector3 &cp);
+	virtual void remove_control_point(int index);
+	virtual Vector3 *get_control_point(int index);
+
+	virtual int get_point_count() const;
+	virtual int get_segment_count() const = 0;
+	virtual void set_arc_parametrization(bool state);
+	virtual void set_ease_curve(Curve *curve);
+	virtual void set_ease_sample_count(int count);
+
+	virtual Vector3 operator ()(scalar_t t) const;
+
+	virtual void set_xform_func(Vector3 (*func)(const Vector3&));
+
+	friend bool save_curve(const char *fname, const Curve *curve);
+};
+
+class BSpline : public Curve {
+protected:
+	virtual Vector3 interpolate(scalar_t t) const;
+
+public:
+	virtual int get_segment_count() const;
+};
+
+typedef BSpline	BSplineCurve;
+
+
+class CatmullRomSpline : public Curve {
+protected:
+	virtual Vector3 interpolate(scalar_t t) const;
+
+public:
+	virtual int get_segment_count() const;
+};
+
+typedef CatmullRomSpline CatmullRomSplineCurve;
+
+
+class BezierSpline : public Curve {
+protected:
+	virtual Vector3 interpolate(scalar_t t) const;
+
+public:
+	virtual int get_segment_count() const;
+
+	Vector3 get_control_point(int i) const;
+	Vector3 get_tangent(scalar_t t);
+};
+
+class PolyLine : public Curve {
+protected:
+	virtual Vector3 interpolate(scalar_t t) const;
+
+public:
+	virtual int get_segment_count() const;
+};
+
+bool save_curve(const char *fname, const Curve *curve);
+Curve *load_curve(const char *fname);
+
+#endif	// _CURVES_HPP_