winbgim setbkcolor( )

[Nobody/Anonymous]

OK, sorry. I know this subject been in the forum before - I have problems with the setbkcolor function i winbgim
The example at http://www.cs.colorado.edu/~main/bgi/doc/setbkcolor.html
works fine but I can't get setbkcolor() to work in the litle sample program i've downloaded.
Does anyone see what's wrong
Source code below:

include <graphics.h>

include <conio.h>

include <math.h>

include <time.h>

include <stdlib.h>

define PI 3.14159265

void flower(int x, int y, int r)
{
int k;
float x1,y1;
for(k=0;k<=360;k=k+15)
{
x1=rsin(kPI/180.0)+x;
y1=rcos(kPI/180.0)+y;
line(x,y,x1,y1);
}
}

int main(void)
{

int gd=DETECT,gm,k,x,y,r;
srand(time(0));
initwindow(640,480);
(&gd,&gm,"c:\bc32");

cleardevice();
setbkcolor (MAGENTA); //!!!!!!!
setcolor(YELLOW);

for(k=1;k<=20;k++)
{
 x=rand()%640; 
 y=rand()%480; 
 r=rand()%50+20;
 flower(x,y,r);
 delay(500);

}

getch();
}

[Nobody/Anonymous]

I*ve found out that to get the functions
cleardevice();
setbkcolor(3);
working I have to put them in the function
void flower()
why-?
is it not possible to set the backgroundcolor in the beginning of the program?