ngu1k
26 Jul 2021, 13:02

RE:

amusleh said:

Hi,.

The Price enum is used to get the source of moving average from user via indicator parameters, we can use instead DataSeries for source parameter.

thank you....

ngu1k
10 Jul 2021, 16:48

RE:

amusleh said:

You have to define your controls as fields on your indicator class:

using cAlgo.API;
using cAlgo.API.Indicators;

namespace cAlgo
{
    [Indicator(IsOverlay = true, TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class AWEMA : Indicator
    {
        private ExponentialMovingAverage _ema5, _ema24;

        private TextBlock _text;
        private Border _border;

        [Parameter("Source", DefaultValue = Price.High)]
        public Price Source { get; set; }


        protected override void Initialize()
        {
            var series = GetBaseSeries();

            _ema5 = Indicators.ExponentialMovingAverage(series, 5);
            _ema24 = Indicators.ExponentialMovingAverage(series, 24);


            _border = new Border 
            {
                BorderColor = Color.Red,
                Opacity = 0.5,
                BackgroundColor = Color.Yellow,
                BorderThickness = 1.5,
                HorizontalAlignment = HorizontalAlignment.Left,
                VerticalAlignment = VerticalAlignment.Top,
                CornerRadius = 10,
                Width = 130,
                Height = 55,
                Margin = new Thickness(2, 30, 10, 10)
            };
            var stackPanel = new StackPanel 
            {
                Orientation = Orientation.Vertical
            };

            _text = new TextBlock 
            {
                Margin = 5,
                HorizontalAlignment = HorizontalAlignment.Center,
                VerticalAlignment = VerticalAlignment.Center,
                FontWeight = FontWeight.ExtraBold
            };

            stackPanel.AddChild(_text);

            _border.Child = stackPanel;

            Chart.AddControl(_border);
        }

        public override void Calculate(int index)
        {
            // You can set the text by using _text text block text property
            if (_ema5.Result.LastValue > _ema24.Result.LastValue)
            {
                _text.Text = "Green Text";

                _border.BorderColor = Color.Green;
                _border.BackgroundColor = Color.DarkGreen;
            }
            else
            {
                _text.Text = "Red Text";

                _border.BorderColor = Color.Red;
                _border.BackgroundColor = Color.DarkRed;
            }

        }

        private DataSeries GetBaseSeries()
        {
            switch (Source)
            {
                case Price.Open:
                    return Bars.OpenPrices;

                case Price.Close:
                    return Bars.ClosePrices;

                case Price.High:
                    return Bars.HighPrices;

                case Price.Low:
                    return Bars.LowPrices;

                case Price.Median:
                    return Bars.MedianPrices;

                case Price.Typical:
                    return Bars.TypicalPrices;

                case Price.Weighted:
                    return Bars.WeightedPrices;
                default:

                    return Bars.ClosePrices;
            }
        }
    }

    public enum Price
    {
        Open,
        Close,
        High,
        Low,
        Median,
        Typical,
        Weighted
    }
}

You don't have to redraw it on each tick.

Thanks... It worked....

But I have some question, what does public enum price {} for?

ngu1k
08 Jul 2021, 10:48 ( Updated at: 08 Jul 2021, 10:59 )

RE:

ngu1k said:

Hi, I try do build my own indicator. But I have problem with borders.

I've try to show support and resistance value in the top left corner of the chart.

with the condition if ema5 > ema13 the box color is green, and ema5 < ema 13 the box color is red. and put the support & resistance value (that calculate on calculate()) inside the box.

But I cannot made it possible. I've try put the border inside the calculate (), but it slow down my ctrader platform. Here is the sample of my code:

protected override void Initialize()
        {            
            source = CreateDataSeries();
            _ema5 = Indicators.ExponentialMovingAverage(source, periode_ema5);
            _ema24 = Indicators.ExponentialMovingAverage(source, periode_ema24);
            
            if (_ema5.Result.LastValue > _ema24.Result.LastValue)
                {
                    var_border = Color.Green;
                    var_background = Color.DarkGreen;
                }
                else
                {
                    var_border = Color.Red;
                    var_background = Color.DarkRed;
                }
            
            var border = new Border 
                {
                    BorderColor = var_border,
                    Opacity = 0.5,
                    BackgroundColor = var_background,
                    BorderThickness = 1.5,
                    HorizontalAlignment = HorizontalAlignment.Left,
                    VerticalAlignment = VerticalAlignment.Top,
                    CornerRadius = 10,
                    Width = 130,
                    Height = 55,
                    Margin = new Thickness(2, 30, 10, 10)
                };
                var stackPanel = new StackPanel 
                {
                    Orientation = Orientation.Vertical
                };
                stackPanel.AddChild(new TextBlock
                {
                    Text = support_resistance,    // I calculate this on Calculate(), but apparently cannot call that calculation
                    Margin = 5,
                    HorizontalAlignment = HorizontalAlignment.Center,
                    VerticalAlignment = VerticalAlignment.Center,
                    FontWeight = FontWeight.ExtraBold
                });
                border.Child = stackPanel;
                Chart.AddControl(border);
            

I'm new to coding, can anyone help me...

Thanks

I've figured out this problem, by create new fuction

public void DisplayUI ()

{

     if (_ema5.Result.LastValue > _ema24.Result.LastValue)
                {
                    var_border = Color.Green;
                    var_background = Color.DarkGreen;
                }
                else
                {
                    var_border = Color.Red;
                    var_background = Color.DarkRed;
                }
            
            var border = new Border 
                {
                    BorderColor = var_border,
                    Opacity = 0.5,
                    BackgroundColor = var_background,
                    BorderThickness = 1.5,
                    HorizontalAlignment = HorizontalAlignment.Left,
                    VerticalAlignment = VerticalAlignment.Top,
                    CornerRadius = 10,
                    Width = 130,
                    Height = 55,
                    Margin = new Thickness(2, 30, 10, 10)
                };
                var stackPanel = new StackPanel 
                {
                    Orientation = Orientation.Vertical
                };
                stackPanel.AddChild(new TextBlock
                {
                    Text = support_resistance,    // I calculate this on Calculate(), but apparently cannot call that calculation
                    Margin = 5,
                    HorizontalAlignment = HorizontalAlignment.Center,
                    VerticalAlignment = VerticalAlignment.Center,
                    FontWeight = FontWeight.ExtraBold
                });
                border.Child = stackPanel;
                Chart.AddControl(border);

}

Thanks

Is it the correct solution?