#include <stdio.h>
#include <stdlib.h>
#include <graphics.h>
#include <alloc.h>
#include <bios.h>
#include <math.h>
#include <dos.h>
#define PI 3.14159

	

void   angle(int xc,int yc, int rx,int ry,int color)
{
	float px,py;
	int delta=10;
	float rad,i;
	for(i=0;i<=90;i=i+delta){
		rad = (PI*i)/180;
		px  = (rx * cos(rad));
		py  = (ry * sin(rad));
		putpixel (xc + px, yc + py,color);
		putpixel (xc - px, yc + py,color);
		putpixel (xc + px, yc - py,color);
		putpixel (xc - px, yc - py,color);
		delay(200);

	}

}
void   point(int xc,int yc, float rx,float ry)
{
		int i,delta = 10;
		float rad,start_rad,start_deg=0;
		float x1,x2,y1,y2,y;
		start_rad = (start_deg*PI)/180;
		x1 = rx*cos(start_rad);
		y1 = ry*sin(start_rad);
		rad = (delta*PI)/180;
	for(i=0;i<360/delta/4;i++){
		x2 = (x1*cos(rad)) + ((rx/ry)*y1*sin(rad));
//		printf("x=%f ",x2);
		y2 = (y1*cos(rad)) - ((ry/rx)*x1*sin(rad));
//		printf(" y=%f\n",y2);
		line(xc+x1,yc+y1,xc+x2,yc+y2);
		line(xc-x1,yc+y1,xc-x2,yc+y2);
		line(xc+x1,yc-y1,xc+x2,yc-y2);
		line(xc-x1,yc-y1,xc-x2,yc-y2);
		x1 = x2;
		y1 = y2;
		delay(200);
	}
}
void main(void)
{
	
	int gdriver = DETECT, gmode, errorcode;
	initgraph(&gdriver, &gmode, "..\\bgi ");
	errorcode = graphresult();
	if (errorcode != grOk)  /* an error occurred */
	{
		printf("Graphics error: %s\n", grapherrormsg(errorcode));
		printf("Press any key to fail:");
		getch();
		exit(1);
                    /* terminate with an error code */
	}
	angle(300,240, 200,150,GREEN);
	point(300,240, 200,150);
	getch();
	closegraph();
}