arc.h

我自己写的代码 可能比较简单 我实现了模拟图层的功能

///////////////////////////////////////////////////////////
//  Arc.h
//  Implementation of the Class Arc
//  Created on:      18-二月-2009 17:17:24
//  Original author: pangyj
///////////////////////////////////////////////////////////

#if !defined(EA_338448F3_A260_465f_B227_7E6BD48A3DC0__INCLUDED_)
#define EA_338448F3_A260_465f_B227_7E6BD48A3DC0__INCLUDED_

#include "Point2D.h"
#include "ErrorStatus.h"
#include "GeometryPrimitive.h"

class Arc : public GeometryPrimitive
{

public:
	Arc();
	Arc(Point2D pt,double r,double ds,double de);
	virtual ~Arc();

	const Point2D & center()const;
	ErrorStatus center(Point2D & pt);
	ErrorStatus endAngle(double agle);
	double endAngle()const;
	double radius()const;
	ErrorStatus radius(double agle);
	virtual ErrorStatus read(fstream& f);
	double startAngle()const;
	ErrorStatus startAngle(double agle);
	virtual ErrorStatus write(fstream& f);
	virtual void list()const;

private:
	Point2D centerPt;
	double dEndAngle;
	double dRadius;
	double dStartAngle;

};
#endif // !defined(EA_338448F3_A260_465f_B227_7E6BD48A3DC0__INCLUDED_)