Drawign a vertical line

Hello, can anyone give me the simple code to draw a vertical line, a bar if you like in red, 2 pixels wide from y1 to y2?

I have all the code to calculate the y levels but not the drawing code. Any help much appreciated. Thanks in advance,

nigel.

From your posting I assume you don't yet know that there is extensive documentation and a reference manual available, just a few mouse clicks away from you. It is available directly in MetaEditor, just press the "F1" key to get help and examples for any function.

You are interested in the Object functions. ObjectCreate() will create a graphical object in the chart.

hey nigel..... whatever is determing y, in your case , would replace y here.... and of course the other properties can be adjustable if need be.....

sometimes our goal is to have the lines to stay put, other times our goal is to have them adjust with each new bar..... in that case you can use objectdelete, it's commented out here..... wasn't sure of your specific goal.....h

I guess with y the OP meant the y coordinate (vertical, price) and not the x coordinate (time) as in your example.

For such a purpose a trend line is used (OBJ_TREND). time1 and time2 are set to the same time, and price1 and price2 are set to the two prices y1 and y2 mentioned in the first post. OBJPROP_RAY is set to false so the line won't reach beyond the two endpoints.

for constructing the name of the line I usually use an expression like

"line_" + Time[x]

so i can later access (modify or delete) any old line by simply using the bar number or the time of the bar.

hey 7bit.... yes you might be correct..... it was not clear to me his 'goal'..... so the vertical red line was my best guess.......h

And, what if you wanted to plot a moving horizontal line, similar to the Ask or Bid line, except based on other parameters? I know, I will have to look it up at some point. It's on my to-do list ... its just that I have so many other things to keep me busy right now, that I do know about, that are hard enough. I can only do so much at once, that is, and it's more a matter of when I have time.

Thanks.

use a horizontal line as object type, supply only price1 and leave time1 as 0 because it will be ignored anyways.

It is a good idea to build yourself a library of such functions (plotting lines, doing other often used things) over time (everytime you found the solution for a problem and solved it once and for all time) and include it in every EA or indicator you make to save yourself a lot of redundancy and keep your EAs small and clean.

Look at what i have done so far here: http://sites.google.com/site/prof7bit/common_functions if i include this in my EA the whole problem of creating a line is reduced to simply calling line(), horizLine() or vertLine(). Also i can reduce such things like detecting the crossing of user drawn lines with crossedLine() to a simple function call in my EA without having to worry about all the ugly details ever again.

What, these are custom functions and you put them in every EA? Where do you put them, in the header? (as opposed to init or start). I didn't know you could do that? although I have worked with JaveScript before, and have done something similar.

35K (the size of file you are pointing to) seems rather large to add to a script but, since it is loaded once and is stored in memory, then I guess it doesn't matter. It shouldn't affect the processing time once the EA is initialized.

put the file into the includes folder and then

at the beginning of the EA and then i have all these functions at my disposal. It doesn't use more memory than needed and certainly not any amount significant enough to be even noticed at all. Also the compiler will remove all unused functions from the final .ex4 file during compilation, leaving the .ex4 only with what is actually used. And even if this were not the case it were only a few kilobytes of dead code (simply lying there and doing/wasting nothing) and a few kB is next to nothing nowadays.

That actually makes sense. I might consider doing that. Thanks.

For example i recently fixed an annoying (and dangerous) bug that appeared when the internet connection was unreliable in the functions that send market orders (and check for errors) and added some additional bells and whistles to these fuctions. I only had to do this once and then just recompiled all my EAs and they now all automatically make use of the new improved order functions. This is the only reasonable way to re-use code in mql4 and safe yourself LOTS of time and minimize errors.

Many thanks ev everyone for all the comments and fabulous advice and examples. Very much appreciated,

Nigel.