Custom Scatter Symbols and Line Colours by Simon Lloyd

Simon Lloyd

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Hi All,

Hoping someone can help me out here.

I'm trying to change my Buy/Sell symbols on a plot to Trianlg e and TriangleDown, but can't find how to implememnt the option.

Currently, my code looks like this:

Chart plotter = new Chart("EMA:" + Symbol);

plotter.AddSeries(new Series(Symbol, SeriesType.Line, index:0));

plotter.AddSeries(new Series("Buy", SeriesType.Scatter, index:0));

plotter.AddSeries(new Series("Sell", SeriesType.Scatter, index:0));

Where/how do I add the

ScatterMarkerSymbol.Triangle

Thanks

Update Backtest

3 Comments

Simon Lloyd

, ,

Accepted Answer

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Alexandre Catarino

In order to control the market, we need to use the following constructor overload:

public Series(

    string name, 

    SeriesType type, 

    string unit,  

    Color color, 

    ScatterMarkerSymbol symbol = ScatterMarkerSymbol.None)

Note that we need to include "using System.Drawing;" due to the color parameter.

In practice, the code above will be modified to:

plotter.AddSeries(new Series("Buy", SeriesType.Scatter, 

    string.Empty, Color.Green, ScatterMarkerSymbol.Triangle));

plotter.AddSeries(new Series("Sell", SeriesType.Scatter, 

    string.Empty, Color.Red, ScatterMarkerSymbol.TriangleDown));

If we do not want to control the marker color, we should use Color.Empty and let it be set automatically.

Simon Lloyd

29 ,

Thank you so much.

Where do I add the constructor overload? I've added it here:

using QuantConnect;

using System.Drawing;

namespace QuantConnect

{

	public Series (string name, SeriesType type, string unit, Color color, ScatterMarkerSymbol symbol = ScatterMarkerSymbol.None);

and it's telling me that the method must have a return type.

Sorry if this is basic, I'm new to C#

Alexandre Catarino

The constructor is one way to create an instance of a type. When a constructor has overloads, it means it accepts different paramenters. In this case, you can create an intance of Series with two parameters, but you need to use an overload that accepts five.
Breaking it up in steps:

// Creates plotter that is an instance of Chart class

Chart plotter = new Chart("Plotter");



// Creates buySeries that is an instance of Series class

Series buySeries = new Series("Buy", SeriesType.Scatter, 

    string.Empty, Color.Green, 

    ScatterMarkerSymbol.Triangle);



// Adds buySeries into plotter (instance of Chart class)

// using Chart.AddSeries method

plotter.AddSeries(buySeries);

Please checkout the full working example below.

Simon Lloyd

, , edit

Update Backtest

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