buffer problem. need help

[[Deleted]]

hi.

i want to make a red vertical line when e.g. RSI goes down below
level 50 and a green line when its goes up above 50 level. but the problem is,

next bar can be its RSI still be below 50.
so i dont want the indicator to create many red vertical lines
every time RSI is below 50.

my code is like this

static int prevline=0;
// prevline=-1 <-- red line
// prevline=1 <-- green line

blabla...

{

for(i=limit-1; i>=0; i--)
{
RSIbuffer[i] = iRSI(NULL,0,period,PRICE_CLOSE,i);
if( RSIbuffer[i] < 50)
{
prevline=-1;
draw_redline();
}
if( RSIbuffer[i] > 50 )
{
prevline=1;
draw_greenline();
}
}

the code is not complete. my brain got stuck there. anyone please help me

[Ray]

for(i=limit-1; i>=0; i--)
{
RSIbuffer[i] = iRSI(NULL,0,period,PRICE_CLOSE,i);
}

for(i=limit-1; i>=0; i--)

{

if (RSIbuffer[i+1] < 50 && RSIbuffer[i] > 50 ) draw green line

if (RSIbuffer[i+1] > 50 && RSIbuffer[i] < 50 ) draw red line

}

[[Deleted]]

phy:

for(i=limit-1; i>=0; i--)
{
RSIbuffer[i] = iRSI(NULL,0,period,PRICE_CLOSE,i);
}

for(i=limit-1; i>=0; i--)

{

if (RSIbuffer[i+1] < 50 && RSIbuffer[i] > 50 ) draw green line

if (RSIbuffer[i+1] > 50 && RSIbuffer[i] < 50 ) draw red line

}

phy! its too easy! thanks. how come i couldnot think of it