/*****************************************************************************
* bezier.hpp
*****************************************************************************
* Copyright (C) 2003 the VideoLAN team
*
* Authors: Cyril Deguet <asmax@via.ecp.fr>
* Olivier Teulière <ipkiss@via.ecp.fr>
*
* This program 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 program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifndef BEZIER_HPP
#define BEZIER_HPP
#include "../src/skin_common.hpp"
#include "pointer.hpp"
#include <vector>
#define MAX_BEZIER_POINT 1023
/// Class for Bezier curves
class Bezier: public SkinObject
{
public:
/// Values to indicate which coordinate(s) must be checked to consider
/// that two points are distinct
enum Flag_t
{
kCoordsBoth, // x or y must be different (default)
kCoordsX, // only x is different
kCoordsY // only y is different
};
Bezier( intf_thread_t *p_intf,
const std::vector<float> &pAbscissas,
const std::vector<float> &pOrdinates,
Flag_t flag = kCoordsBoth );
~Bezier() { }
/// Get the number of control points used to define the curve
int getNbCtrlPoints() const { return m_nbCtrlPt; }
/// Return the percentage (between 0 and 1) of the curve point nearest
/// from (x, y)
float getNearestPercent( int x, int y ) const;
/// Return the distance of (x, y) to the curve, corrected
/// by the (optional) given scale factors
float getMinDist( int x, int y, float xScale = 1.0f,
float yScale = 1.0f ) const;
/// Get the coordinates of the point at t percent of
/// the curve (t must be between 0 and 1)
void getPoint( float t, int &x, int &y ) const;
/// Get the width (maximum abscissa) of the curve
int getWidth() const;
/// Get the height (maximum ordinate) of the curve
int getHeight() const;
private:
/// Number of control points
int m_nbCtrlPt;
/// vectors containing the coordinates of the control points
std::vector<float> m_ptx;
std::vector<float> m_pty;
/// Vector containing precalculated factoriels
std::vector<float> m_ft;
/// Number of points (=pixels) used by the curve
int m_nbPoints;
/// Vectors with the coordinates of the different points of the curve
std::vector<int> m_leftVect;
std::vector<int> m_topVect;
/// Vector with the percentages associated with the points of the curve
std::vector<float> m_percVect;
/// Return the index of the curve point that is the nearest from (x, y)
int findNearestPoint( int x, int y ) const;
/// Compute the coordinates of a point corresponding to a given
/// percentage
void computePoint( float t, int &x, int &y ) const;
/// Helper function to compute a coefficient of the curve
inline float computeCoeff( int i, int n, float t ) const;
/// x^n
static inline float power( float x, int n );
};
typedef CountedPtr<Bezier> BezierPtr;
#endif
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