// Circ.cpp: implementation of the Circ class.
//
//////////////////////////////////////////////////////////////////////
#include <math.h>
#include <GL/glut.h>
#include "Circ.h"
#define PI 3.1415826

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

Circ::Circ(float rad,int n)
{
	int i;
	float angle;
	_n = n;

	xpts = new float[n];
	ypts = new float[n];

	for (i=0;i<n;++i)
	{
		angle = 2.0*PI*i/_n;
		xpts[i] = rad*cos(angle);
		ypts[i] = rad*sin(angle);
	}

}

Circ::~Circ()
{

}

void Circ :: Outline(float rad, float x, float y)
{
	int i;

	glBegin(GL_LINE_LOOP);

	for (i=0; i< _n; ++i)
	{
		glVertex2f(xpts[i]*rad + x,ypts[i]*rad + y);
	}

	glEnd();
}

void Circ :: Filled()
{

	int i;

	glBegin(GL_TRIANGLE_FAN);

	glVertex2f(0.0,0.0);

	for (i=0; i< _n; ++i)
	{
			glVertex2f(xpts[i],ypts[i]);
	}

	glVertex2f(xpts[0], ypts[0]);

	glEnd();
}

void Circ :: Filled(float size)
{

	int i;

	glScalef(size,size,size);

	glBegin(GL_TRIANGLE_FAN);

	glVertex2f(0.0,0.0);

	for (i=0; i< _n; ++i)
	{
			glVertex2f(xpts[i],ypts[i]);
	}

	glVertex2f(xpts[0], ypts[0]);

	glEnd();
}	


void Circ :: Filled(float size, float x, float y)
{

	int i;

	//glScalef(size,size,size);

	glBegin(GL_TRIANGLE_FAN);

	glVertex2f(x,y);

	for (i=0; i< _n; ++i)
	{
			glVertex2f(xpts[i]*size+x,ypts[i]*size+y);
	}

	glVertex2f(xpts[0]*size + x, ypts[0]*size + y);

	glEnd();
}