#include <graphics.h>
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <conio.h>
#include <dos.h>
//f:[-90,90]->R, y=ax+b
int gd,gm,a=2,b=10,x0,y0, x,y,i,j,dx=50,petale,culoare;

void main(void)
{
	clrscr();
	randomize();
	printf("y=a*x+b\n");
//	printf("a=");
//	scanf("%d",&a);
//	printf("b=");
//	scanf("%d",&b);
//	printf("dom de def\n");
//	printf("dx=");
//	scanf("%d",&dx);
	printf("cate petale");
	scanf("%d",&petale);
	if (a!=0)	x0=-b/a;
	y0=b;

	detectgraph(&gd,&gm);
	initgraph(&gd,&gm,"C:\\borlandc\\bgi");
/*	moveto(100,100);
	outtextxy(150,100,"x");
	moveto(100,100);

	linerel(50,100);
	outtextxy(150,200,"y");*/
	line(100,240,540,240);
//	outtextxy(497,237,">");
	moveto(540,240);
	linerel(-5,-5);
	moveto(540,240);
	linerel(-5,5);

	line(320,50,320,400);
	moveto(320,50);
	linerel(-5,5);
	moveto(320,50);
	linerel(5,5);

	//line(320,240-y0,320+x0,240);
	for (i=-dx;i<dx;i++)
		{
			putpixel(i+320,240-i*a-b,WHITE);
			putpixel(i+320,240-i*i-i*a-b,WHITE);

		}
//	setfillpattern
	culoare=12;
/*	for (j=0;j<360;j++)
		{
//		culoare=random(MAXCOLORS);
		for (i=0;i<petale;i++)
			{
				setcolor(0);
				setfillstyle(WIDE_DOT_FILL,0);
				pieslice(320,240,j-1+i*360/petale,j-1+i*360/petale+180/petale,100);
				setcolor(15);
				setfillstyle(WIDE_DOT_FILL,culoare);
				pieslice(320,240,j+i*360/petale,j+i*360/petale+180/petale,100);
			}
		delay(1);
		}*/

	circle(120,120,100);
	circle(70,70,10);
	circle(170,70,10);
//	arc(120,120,230,310,60);
/*	for (i=1;i<8000;i++)
	{
		arc(120,120-i,230+i,310-i,60+i);
		delay(10);

	}
	for (i=0;i<80;i--)
	{
		arc(120,200+i,230,310,60-i);
		delay(10);
	}
*/

	for (j=2;j<2000;j++)
		{
			for (i=-dx/2;i<dx/2;i++)
				{
					putpixel(i+120,120-i*i/(j-1),0);
				}
			delay(1);
			for (i=-dx/2;i<dx/2;i++)
				{
					putpixel(i+120,120-i*i/(j),15);
				}

		};

	for (j=2000;j>10;j--)
		{
			for (i=-dx/2;i<dx/2;i++)
				{
					putpixel(i+120,120+i*i/(j+1),0);
				}
			delay(1);
			for (i=-dx/2;i<dx/2;i++)
				{
					putpixel(i+120,120+i*i/(j),15);
				}

		};

	getch();

}