Color on Histogram solution

[Orphelin@xxxxxxx]

Dans un courrier daté du 06/11/98 08:13:31 Heure d8iver Pari31 Madrid,
countach@xxxxxxxxxxxxxxxx a écrit :

(snip)

>  >
>  >The code works well on EOD data (I've cleaned it up a little). The
>problem 
> occurs when it is applied to live intraday data. If the >hist is rising 
> during a tick, then reverses, that bar becomes a >green bar with a red bar 
> superimposed over it.
>  
>  The problem is that once a bar is painted, it stays in the graphics
>  memory.  If you paint over it it will disappear.  If you paint over part
>  of it, you get the second color and some of the first.
>  
>  The solution has been mentioned here before. You must repaint the
>  previous value in the background color to obliterate it, then paint the
>  new value in its color.  This may be difficult, however, if updating on
>  every tick, since TS updates variables only at the close of a bar, not
>  by tick.  The previous  painted value (a tick) is gone, unless you use
>  global variables to save it.
>  
>  donc
>  

This is not true:

When updating every tick, TS calculates and plot the considered value like if
the last tick of the "underconstruction bar" was closed with a close value
that is precisely the last tick value.
The above  quoted statement is true  only for systems ( where update every
tick is impossible)

No need of  global variable DLL or repainting with the background color.
Suffice to think on how TS works:
The code is executed from top to end.
The idea it to plot ( plot1 and 2) first with a zero value.
Then plot again  (plot1 and 2) the colored histogram with the real value MACDD
that will be updated on every tick, and that will plot over a 0 amplitude
histogram ( e.g on a clear background).

Here is the  TS code:

{
MaxBarsBack set to 1 ( yes!)
Plot1: green histogram
plot2: red histogram
}

Inputs: FastMA(12),SlowMA(26),MacdMA(9);

value1=MACD(Close,FastMA,SlowMA)-(XAverage(MACD(Close,FastMA,SlowMA),MacdMA));
{ Note that the MACD calculation here is not optimized for speed. It should
be... }

plot1(0,"+");
plot2(0,"-");     <======reset plot values to 0 before plotting  the MACDD
values ( erases last bar value)

if value1>value1[1] then begin
	plot1(value1,"+");   <=========plots according to MACD climbing
	end else begin
	plot2(value1,"-");    <=========plots according to MACD falling
end;

Sincerely,

-Pierre Orphelin
www.sirtrade.com