TRIX Indicator
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Topic Overview

Purpose

This topic provides a conceptual overview of the IGChartView™ control’s TRIX Indicator and provides a code example demonstrating how to add it to the chart.

In this topic


Introduction

TRIX indicator summary

The TRIX indicator is a measure of momentum used to identify overbought or oversold securities. Like other oscillators, TRIX scores hover around zero, with a positive value indicating an overbought security and a negative value indicating an oversold security. The TRIX calculation uses a triple exponential smoothed moving average of the price over a specific period and Frequently uses a signal line to indicate where a security’s price is likely to be in the future.

Data requirements

While the IGChartView control allows easy binding to your own data model, make sure to supply the appropriate amounts and types of data required by the series. Failing to do so causes the IGChartView to appear blank.

Required – the data model must contain a numeric field, “close” for rendering data.


Adding a TRIX Indicator to the IGChartView – Code Example

Description

The following code uses the IGOHLCSeriesDataSourceHelper to supply randomly generated data to a financial price series by first adding to the IGChartView instance, then next adding the financial indicator to the IGChartView instance as a series, and then finally adding the IGChartView as a subview of the current UIView.

Prerequisites

This code example requires the inclusion of the IGChartView framework, detail about how to add this framework can be found in the Adding the Chart Framework File topic.

Code

In C#:

List<NSObject> open = new List<NSObject>();
for (int i = 0; i < 25; i++) {
      open.Add(new NSNumber((new Random((int)DateTime.Now.Ticks).Next(100))));
}
List<NSObject> high = new List<NSObject>();
for (int i = 0; i < 25; i++) {
      high.Add(new NSNumber((new Random((int)DateTime.Now.Ticks).Next(130))));
}
List<NSObject> low = new List<NSObject>();
for (int i = 0; i < 25; i++) {
      low.Add(new NSNumber((new Random((int)DateTime.Now.Ticks).Next(100))));
}
List<NSObject> close = new List<NSObject>();
for (int i = 0; i < 25; i++) {
      close.Add(new NSNumber((new Random((int)DateTime.Now.Ticks).Next(110))));
}
List<NSObject> volume = new List<NSObject>();
for (int i = 0; i < 25; i++) {
      volume.Add(new NSNumber((new Random((int)DateTime.Now.Ticks).Next(1100000))));
}
IGOHLCSeriesDataSourceHelper source = new IGOHLCSeriesDataSourceHelper();
source.OpenValues = open.ToArray();
source.HighValues = high.ToArray();
source.LowValues = low.ToArray();
source.CloseValues = close.ToArray();
source.VolumeValues = volume.ToArray();
IGChartView infraChart = new IGChartView(this.View.Frame);
infraChart.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
IGCategoryXAxis xAxis = new IGCategoryXAxis("xAxis");
IGNumericYAxis yAxis = new IGNumericYAxis("yAxis");
infraChart.AddAxis(xAxis);
infraChart.AddAxis(yAxis);
IGFinancialPriceSeries financialPriceSeries = new IGFinancialPriceSeries("financialPriceSeries");
financialPriceSeries.XAxis = xAxis;
financialPriceSeries.YAxis = yAxis;
financialPriceSeries.DataSource = source;
financialPriceSeries.DisplayType = IGPriceDisplayType.IGPriceDisplayTypeCandlestick;
IGTRIXIndicator financialIndicator = new IGTRIXIndicator("financialIndicator");
financialIndicator.XAxis = xAxis;
financialIndicator.YAxis = yAxis;
financialIndicator.DataSource = source;
financialIndicator.Thickness = 3.0f;
infraChart.AddSeries(financialPriceSeries);
infraChart.AddSeries(financialIndicator);
(this.View).AddSubview(infraChart);

In Objective-C:

    NSMutableArray *open = [[NSMutableArray alloc] init];
    for (int i = 0; i < 25; i++) {
        [open addObject:[[NSNumber alloc] initWithDouble:(arc4random() % 100)]];
    }
    
    NSMutableArray *high = [[NSMutableArray alloc] init];
    for (int i = 0; i < 25; i++) {
        [high addObject:[[NSNumber alloc] initWithDouble:(arc4random() % 100 + 30)]];
    }
    
    NSMutableArray *low = [[NSMutableArray alloc] init];
    for (int i = 0; i < 25; i++) {
        [low addObject:[[NSNumber alloc] initWithDouble:(arc4random() % 100)]];
    }
    
    NSMutableArray *close = [[NSMutableArray alloc] init];
    for (int i = 0; i < 25; i++) {
        [close addObject:[[NSNumber alloc] initWithDouble:(arc4random() % 100 + 10)]];
    }
    
    NSMutableArray *volume = [[NSMutableArray alloc] init];
    for (int i = 0; i < 25; i++)
    {
        [volume addObject:[[NSNumber alloc] initWithDouble:(arc4random() % 1000000 + 100000)]];
    }
    
    IGOHLCSeriesDataSourceHelper *source = [[IGOHLCSeriesDataSourceHelper alloc] init];
    source.openValues = open;
    source.highValues = high;
    source.lowValues = low;
    source.closeValues = close;
    source.volumeValues = volume;
    
    IGChartView *infraChart = [[IGChartView alloc] initWithFrame:self.view.frame];
    [infraChart setAutoresizingMask:UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight];
    
    IGCategoryXAxis *xAxis = [[IGCategoryXAxis alloc] initWithKey:@"xAxis"];
    IGNumericYAxis *yAxis = [[IGNumericYAxis alloc] initWithKey:@"yAxis"];
    [infraChart addAxis:xAxis];
    [infraChart addAxis:yAxis];
    
    IGFinancialPriceSeries *financialPriceSeries = [[IGFinancialPriceSeries alloc] initWithKey:@"financialPriceSeries"];
    financialPriceSeries.xAxis = xAxis;
    financialPriceSeries.yAxis = yAxis;
    financialPriceSeries.dataSource = source;
    financialPriceSeries.displayType = IGPriceDisplayTypeCandlestick;
    IGTRIXIndicator *financialIndicator = [[IGTRIXIndicator alloc] initWithKey:@"financialIndicator"];
    financialIndicator.xAxis = xAxis;
    financialIndicator.yAxis = yAxis;
    financialIndicator.dataSource = source;
    financialIndicator.thickness = 3.0f;
    
    [infraChart addSeries:financialPriceSeries];
    [infraChart addSeries:financialIndicator];
    [self.view addSubview:infraChart];

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Topics

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Topic

Purpose

This collection of topics explains each of the individual charts supported by the IGChartView control.