drawShapeRelative - performance ?

[jh109052]

Has anyone seen a problem with performance when using drawShapeRelative in version 7.8 ? I have noticed that when I use this in my efs, the CPU usage goes up drastically and the response time decreasing a great deal. Any thoughts on how to use this function without experiencing a drag on the CPU ?

Thanks !
Jennifer

[ACM]

Jennifer
Graphics (lines, shapes, text) will affect performance as they need to be constantly refreshed.
To work around this you could create a counter that you increase at every bar and then use together with the tag name to limit the number of graphic objects drawn on the chart.
Alex

[Doji3333]

the other thing..

is you can reduce your # of days/bars on the chart to compensate for this as a solution.

Jennifer,

Here is a sample of how you would accomplish limiting the number of lines on the chart, using the method Alex described.

I just used the structure out of the help file for the draw statement as an example. I am sure you are familiar, but if in doubt, please see the help file for definitions of the dummy variables I used.

drawLineRelative( x1, y1, x2, y2, style, thickness, color [, tagID] )

I replaced the [,tagID] with the looping counter Alex described. The text in front of the yourcounter variable makes each unique.

//outside MAIN

var yourcounter = 0;

//before your graphics statements 
if (getBarState() == BARSTATE_NEWBAR) { 
  if (varcounter > 50)
    varcounter =0;
  else varcounter++;

  //your graphics statements - just an example, they can be text, symbols, whatever, this is how you control the total number on the chart, to minimize performance issues

  drawLineRelative( x1, y1, x2, y2, style, thickness, color ,"each"+varcounter ); //first line
  drawLineRelative( x1, y1, x2, y2, style, thickness, color ,"is"+varcounter ); //second unique line
  drawLineRelative( x1, y1, x2, y2, style, thickness, color ,"a"+varcounter );//third unique line 
  drawLineRelative( x1, y1, x2, y2, style, thickness, color ,"different"+varcounter );//fourth unique line 
  drawLineRelative( x1, y1, x2, y2, style, thickness, color ,"line"+varcounter ); //fifth unique line
  drawLineRelative( x1, y1, x2, y2, style, thickness, color ,"every"+varcounter ); //sixth unique line
  drawLineRelative( x1, y1, x2, y2, style, thickness, color ,"bar"+varcounter ); //seventh unique line
} 

just a caution, make sure they are implemented only once per bar, otherwise, they will be drawn every tick and you may have only one visble line on your chart.

Hope this helps