drawlinerelative

[Rana]

premain function
setColorPriceBars(true);
.......
Can we have a similar function for "drawlineralative(true or false) in premain as well ? that can help me erase the lines on chart by setting the study to false.

Thank you

[ACM]

Rana
Just add a Boolean FunctionParameter in preMain called for example showLines and then in your main function precede each instance of a drawLineRelative() command with a if(showLines) conditional statement. When the showLines parameter is set to true the efs will draw the lines else it will not
See this article in the EFS KnowledgeBase for information regarding the FunctionParameter object and some examples of its usage
Alex

premain function
setColorPriceBars(true);
.......
Can we have a similar function for "drawlineralative(true or false) in premain as well ? that can help me erase the lines on chart by setting the study to false.

Thank you

[Rana]

function preMain() {
// setting drawlinerelative parameters off when not wanted

var fp5 = new FunctionParameter("showLines", FunctionParameter.BOOLEAN);
fp5.setName("show Lines");
fp5.setDefault(true); }

function main(showLines ) {
............
.........

if ( showLines ==true) && (a>b)
{ drawLineRelative(0, low(),0, low(), PS_SOLID, 2, Color.red, "PL"+rawtime(0) ); }
}

This is what I have understood from the thread so far.
Kindly help me further with this please.

Rana

[ACM]

Rana
In essence that is what I suggested.
That said the syntax in the following line of your code sample
if(showLines ==true) && (a>b)
is incorrect and should be
if(showLines ==true && a>b)
or even
if(showLines && a>b)
ie without the need of ==true since the parameter is a Boolean hence only true or false
Then again you may want to separate those conditions if for example you want to execute multiple commands based on the condition a>b. In that case you would write it as
if(a>b){
if(showLines) drawLineRelative(...);
setBarBgColor(...);
...etc;
}
Anyhow there are many ways to do any and all of this.
Alex

function preMain() {
// setting drawlinerelative parameters off when not wanted

var fp5 = new FunctionParameter("showLines", FunctionParameter.BOOLEAN);
fp5.setName("show Lines");
fp5.setDefault(true); }

function main(showLines ) {
............
.........

if ( showLines ==true) && (a>b)
{ drawLineRelative(0, low(),0, low(), PS_SOLID, 2, Color.red, "PL"+rawtime(0) ); }
}

This is what I have understood from the thread so far.
Kindly help me further with this please.

Rana

[Rana]

function preMain() {
// setting parameters to turn off drawlinerelativewhen not wanted
var fp5 = new FunctionParameter("showLines", FunctionParameter.BOOLEAN);
fp5.setName("show Lines");
fp5.setDefault(false); }

function main(showLines ) {
............
if ( va < vb && vc < vd ) {
if (showLines );
drawLineRelative(....... );
drawLineRelative(....... );

}

I am missing something here. Please help me again with this.

Thank you

[ACM]

Rana
While JavaScript (as well as some other languages) allows you to execute a single statement without the need to use curly brackets ie

if(this_condition) execute_this_command;
//or
if(this_condition)
    execute_this_command; 

if you need to execute more than one statement based on the same condition then you need to include them all in curly brackets ie

if(this_condition){
    execute_this_command;
    execute_this_other_command;
    etc;
} 

or [for completeness of information] if for some specific reason you do not want to use curly brackets then you need to use a comma after each statement and a semi-colon only after the last one (note that some will argue - and perhaps correctly so - that this is not good coding practice as it may lead to errors that are difficult to identify)

if(this_condition)
    execute_this_command,
    execute_this_other_command,
    etc; 

Anyhow as you can see in the example I posted earlier I had specifically set the drawLineRelative() command as a single statement following the if(showLines) condition meaning that only that one statement would have been executed based on the showLines setting while all the statements included in the curly brackets would have been executed if the a>b condition were true
Alex

function preMain() {
// setting parameters to turn off drawlinerelativewhen not wanted
var fp5 = new FunctionParameter("showLines", FunctionParameter.BOOLEAN);
fp5.setName("show Lines");
fp5.setDefault(false); }

function main(showLines ) {
............
if ( va < vb && vc < vd ) {
if (showLines );
drawLineRelative(....... );
drawLineRelative(....... );

}

I am missing something here. Please help me again with this.

Thank you

[Rana]

thank you very much for your help. I guess I can't deal with technicalities and leave it for you guys with better technical understanding and abilities to play with it.
Thank you anyway for giving my questions a thought.

[Rana]

swapping (a>b) with (showlines) has sorted my problems as you explained.
Thank you very much for your help Alex. I am slow in understanding these things.

Asking questions here for help from experts like you far outweighs than learning whole JAVA language in my opinion. If I want to drive a fast car, it doesn't matter how companies build a faster engine, I look for " where to buy it and some driving lessons " rather than LEARNING TO build a faster engine. and yea I am not a successful trader.