Sample to illustrate drawing basic shapes.

#include <graphics.h>

int main(void)
{
int gm = DETECT, gd, x, y;
int arr[] = { 540, 220, 530, 270, 570, 320, 510, 320, 490, 270, 540, 220 };
struct linesettingstype ls;

initgraph( &gm, &gd, "C:\\TC\\BGI" );
x = getmaxx();
y = getmaxy();

/* RECTANGLE */
rectangle(x / 30, y / 20, x / 5, y / 4);
outtextxy(x / 30 + 15, y / 8 + 5 ,"RECTANGLE");

/* CIRCLE */
circle(x / 2, y / 6, 75);
putpixel(x / 2, y / 6, WHITE);
outtextxy(x / 2 - textwidth("CIRCLE") / 2, y / 6 + 10, "CIRCLE");

/* ARC */
arc(x / 5, y / 2, 300, 90, 80);
outtextxy(x / 4, y / 2, "ARC");

/* LINES */
/* DEFAULT SETTINGS */
line(x / 30, y / 2, x / 6, y / 2);

/* SAVE CURRENT SETTINGS */
getlinesettings(&ls);

/* CHANGE SETTINGS */
setlinestyle(DASHED_LINE, 0, THICK_WIDTH);
line(x / 30, 10 * y / 17, x / 6, 10 * y / 17);

/* RESTORE ORIGINAL SETTINGS */
setlinestyle(ls.linestyle,ls.upattern,ls.thickness);
line(x / 30, 10 * y / 15, x / 6, 10 * y / 15);
outtextxy(x / 30 + 10, 10 * y / 15 + 10, "LINES");

/* ELLIPSE */
ellipse(x / 2, 10 * y / 17, 0, 360, 100, 50);
putpixel(x / 2, 10 * y / 17, WHITE);
outtextxy(x / 2 - textwidth("ELLIPSE") / 2, 10 * y / 17 + 10, "ELLIPSE");

/* POLYGON */
drawpoly(6,arr);
outtextxy(515, 270, "POLYGON");

getch();
closegraph();
restorecrtmode();

return 0;
}