QUESTION 1: What I really want to do is to plot a horizontal line across my intraday chart with *the current day's opening price*. Is there a straightfoward way to do this, or will I need to code something more complex?
UPDATE: I think I figured out how to do what I wanted. Is this the right way to do it?
// Plot each day's opening price across the Intraday chart
opening=BarsSince (day() != ref(day(),1)); // How many bars ago was the first bar of the day?
todayopened=Ref(open,opening); // Record the value of open() for that many bars ago.
Plot (todayopened,"OPEN",colorDeepSkyBlue, ChartLine, StyleWidth2|StyleDotted|StyleHideValues);
I saw that I could replace Ref(open,opening) with HistoPrice (_open,opening) but it doesn't seem to be any better.
QUESTION 2: Is there some sort of function like IsIntraday() so I can detect if I'm on an intraday chart?
I had to make one more adjustment to avoid plotting a line across zero on the historical (daily) chart. Here's what I ended up with:
c = HistoPrice(_open, 0);
plot(max(c,(iseod()==1)*close), "");
UpdateColor (iseod()==1, ColorTransparent);
Based on my understanding of the scripting language, I can't do an if-then statement that will allow me to avoid the plot() function if IsEOD is true. So instead, when IsEOD is true, I set c to equal the closing value (to avoid stretching the vertical auto-scaling) and then an UpdateColor that sets the color to Transparent (so that it isn't shown on-screen).
If there is a way to use conditional IF...THEN...ELSE statements *in the scripting language* with functions like Plot(), let me know! :)
For others who may end up reading this, I wanted to offer another If command that they might get some good use out of. When graphing the output of various indicators, you may want to apply a different text label (and, hey, let's go ahead and change the color too) depending on what the value of a variable might be.
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