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/*
* Copyright (c) 2014 by James Bremner
* All rights reserved.
*
* Use license: Modified from standard BSD license.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation, advertising
* materials, Web server pages, and other materials related to such
* distribution and use acknowledge that the software was developed
* by James Bremner. The name "James Bremner" may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#pragma once
// The following ifdef block is the standard way of creating macros which make exporting
// from a DLL simpler. All files within this DLL are compiled with the CSPLINE_EXPORTS
// symbol defined on the command line. This symbol should not be defined on any project
// that uses this DLL. This way any other project whose source files include this file see
// CSPLINE_API functions as being imported from a DLL, whereas this DLL sees symbols
// defined with this macro as being exported.
#ifdef CSPLINE_DYN_LINK
#ifdef CSPLINE_EXPORTS
#define CSPLINE_API __declspec(dllexport)
#else
#define CSPLINE_API __declspec(dllimport)
#endif
#else
#define CSPLINE_API
#endif
#include <vector>
// This class is exported from the CSpline.dll
/** A 2D cubic spline : draws a set of smooth curves through points */
class CSPLINE_API cSpline
{
public:
/** Constructor: Calculates the spline curve coefficients
@param[in] x The x points
@param[in] y The y points
*/
cSpline(
const std::vector< double >& x,
const std::vector< double >& y);
/** Check if input is insane
@return true if all OK
*/
bool IsSane() const
{
return static_cast<bool>(!myError);
}
/// error numbers
enum CSPLINE_API e_error
{
no_error,
x_not_ascending,
no_input,
not_single_valued,
not_bijective
} myError;
/** Check for error
@return 0 if all OK, otherwise an error number
*/
e_error IsError() const
{
return myError;
}
/** Get the Y value of the spline curves for a particular X
@param[in] x
@return the y value
*/
double getY(double x);
private:
/// The coefficients of the spline curve between two points
struct CSPLINE_API SplineSet
{
double a; // constant
double b; // 1st order coefficient
double c; // 2nd order coefficient
double d; // 3rd order coefficient
double x; // starting x value
};
/// The coefficients of the spline curves between all points
#pragma warning( disable : 4251 )
std::vector< SplineSet > mySplineSet_;
bool IsInputSane(const std::vector<double>& myX, const std::vector<double>& myY);
};
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