// Calculation Program for calculating shape of a flower with the use of a circle_f2, edited in Mar. 06, 2009 & reviced Sep. 14, 2012.



// file name: flower_f2.c



#include< stdio.h>

#include< math.h>



void main(void)

{

	double a,pi;

	double r,f;

	double fmin,fmax,df;

	double x,y;

	double rr,ff;

	int n;

	double b,c;

	double d;

	double e;

	double p;// the index of overlap of petals

	int i,imax,j;

	double xx[20001],yy[20001];

	double fs,dfs,ff0,ffs;



	FILE *fp;



// setting of the constants

	pi=3.14159265;

	a=1;



	b=0.;

	c=1;

	d=2;

	e=1.;

	p=2;// 0< p< 1 in the case of no overlap of petals, and 1< p in the case of overlap of petals



	printf("Input of numbers of petals. \n n=? ");

	scanf("%d",&n);

	printf("n=%d\n",n);

	printf("\n");



// setting of the other parameters

	fmin=-pi/2;

	fmax=3*pi/2;



	df=(fmax-fmin)/100;



	i=0;



// execution of calculation

	for(j=1;j<=n;j++)

	{

		for(f=fmin;f<=fmax;f=f+df)

		{

			i++;



			r=a;



//			x=c*r*cos(f);

			x=c*r*(1+b*(1-sin(f)))*cos(f);

			y=d*r*sin(f)+a*d;



			rr=sqrt(x*x+y*y);



			ff=(f+(2*pi*j/2.+((n/2.)-5)*pi/2))/(n/2.);



			if(fabs(p-1.)>0.00001) // connecting by an arc curve to fill a gap between adjacent petals (start)

			{



				if(i==1&&j==1)

				{

					ff0=ff;

				}



				if(f==fmin&&j>1)

				{

					if(ffs>ff)

					{

						dfs=(ffs-ff)/20;

						for(fs=ffs;fs>=ff;fs=fs-dfs)

						{

							xx[i]=e*cos(fs);

							yy[i]=e*sin(fs);

							i++;

						}

					}

					else

					{

						dfs=(ff-ffs)/20;

						for(fs=ffs;fs<=ff;fs=fs+dfs)

						{

							xx[i]=e*cos(fs);

							yy[i]=e*sin(fs);

							i++;

						}

					}

				}				

			} // connecting by an arc curve to fill a gap between adjacent petals (the end)



			ffs=ff;

			

			xx[i]=(rr+e)*cos(ff);

			yy[i]=(rr+e)*sin(ff);



			printf("i=%d,x=%f,y=%f\n",i,xx[i],yy[i]);

		}

	}

	

	if(fabs(p-1.)>0.00001) // connecting by an arc curve to fill a gap between adjacent petals (start)

	{

		if(ffs>2*pi)

		{

			ffs=ffs-2*pi;

		}

		

		if(ffs>ff0)

		{

			dfs=(ffs-ff0)/20;

			for(fs=ffs;fs>=ff0;fs=fs-dfs)

			{

				i++;

				xx[i]=e*cos(fs);

				yy[i]=e*sin(fs);

			}

		}

		else

		{

			dfs=(ff0-ffs)/20;

			for(fs=ffs;fs<=ff0;fs=fs+dfs)

			{

				i++;

				xx[i]=e*cos(fs);

				yy[i]=e*sin(fs);

			}

		}

	} // connecting by an arc curve to fill a gap between adjacent petals (the end)



	i++;



	xx[i]=xx[1];

	yy[i]=yy[1];



	imax=i;



// writing the calculated coordinates data of the curve into a textfile

	fp=fopen("flower_f.txt","w");

	if(fp==NULL)

		{

		printf("FILE OPEN ERROR\n");

		}

	else

		{

		for(i=1;i<=imax;i++)

		{

			fprintf(fp,"%f,%f\n",xx[i],yy[i]);

		}

		fflush(fp);

		fclose(fp);

		}

	printf("end\n");

}// the end of the program