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Performance problem with DrawRectangle
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Performance problem with DrawRectangle

  #1 (permalink)
Elite Member
Munich, Germany
 
Futures Experience: Intermediate
Platform: NinjaTrader, TWS
Broker/Data: IB, NinjaTrader Brokerage
Favorite Futures: ES,NQ,6E
 
Posts: 62 since Feb 2010
Thanks: 15 given, 22 received

Performance problem with DrawRectangle

I want to draw a zone arround horizontial lines (Pivot's)
and use following code

for (int i = 0; (i < base.Values.Length) && (base.Values[i].Count > 0); i++)
{
double value = base.Values[i][0];
double yH = value + zoneSize * TickSize;
double yL = value - zoneSize * TickSize;
Color colorZone = Plots[i].Pen.Color;
if( colorZone != Color.Transparent )
{
if( zoneShowAll )
{
DrawRectangle(
string.Format( "Zone{0}_{1}", i, CurrentBar ),
false,
Displacement+1,
yH,
Displacement,
yL,
Color.Transparent,
Plots[i].Pen.Color,
zoneOpacity );
}
else
{
DrawRectangle(
string.Format( "Zone{0}", i ),
false,
Displacement+width+1,
yH,
Displacement,
yL,
Color.Transparent,
Plots[i].Pen.Color,
zoneOpacity );
}
}
}
}

Problem is that load of indicator is very slow.

Any idea how to improve load time

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  #2 (permalink)
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  #3 (permalink)
Elite Member
Berlin, Europe
 
Futures Experience: Advanced
Platform: NinjaTrader, MultiCharts
Broker/Data: Interactive Brokers
Favorite Futures: Keyboard
 
Fat Tails's Avatar
 
Posts: 9,653 since Mar 2010
Thanks: 4,226 given, 25,602 received
Forum Reputation: Legendary


If you have lot of draw objects, this has indeed a negative impact on performance and the loading of the chart may take quite a long time. This does not only affect rectangles, but also applies to arrows, diamonds and other draw objects.

What I have done for some of my indicators, is that I entered a user-selectable lookback period, for example 15 days from now. I then check for that lookback period in OnBarUpdate and only plot those rectangle if the barTime is inside that lookback period.

This speeds up the indicator, as the rectangles are not plotted over the whole lookback period of the chart.

Another way of doing it - maybe more elegant:

-> Check ChartControl for null in OnStartUp (to avoid problems if your indicator is addressed by another indicator or strategy)
-> Determine the last bar painted on your current chart.
-> Plot rectangles only, if they are within a lookback period of 15 something days counted from the last bar painted.

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