Modified on 2008/04/24 11:55 by Administrator — Categorized as: Standard Indicators


public static DIPlus Series(Bars bars, int period)

Parameter Description

bars The Bars object
period Indicator calculation period


DIPlus is a component of the Directional Movement System developed by Welles Wilder. This system attempts to measure the strength of price movement in positive and negative directions, as well as the overall strength of the trend. DIPlus is normally used with the DIMinus, DX and ADX indicators and typically uses 14 periods.

The DIPlus value represents upward price movement as a percentage of true range. The more each up bar's price is equal to the true range, the larger the value of the DIPlus. The DIPlus and the DIMinus are not mirror images.



+DI = Round( ( +DM / TR ) * 100 )

DI+ = DIPlus
TR = TrueRange of current bar

The +DI is then smoothed over the period specified, the same way as a simple moving average, and +DM is calculated as follows:
  1. For up trending days, +DM = today's high - yesterday's high
  2. For down trending days, +DM = zero
  3. For inside days, +DM = zero
  4. For outside days, if today's high - yesterday's high, is greater than yesterday's low- today's low, then +DM = today's high - yesterday's high, otherwise +DM = zero
  5. For upwards gap days, +DM = today's high - yesterday's high
  6. For downwards gap days, +DM = zero


using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using WealthLab;
using WealthLab.Indicators;

namespace WealthLab.Strategies { public class MyStrategy : WealthScript { protected override void Execute() { // Flag bars with dotted lines when DI+ is above 40 ChartPane ADXPane = CreatePane( 50, true, true ); PlotSeries( ADXPane, DIPlus.Series( Bars, 14 ), Color.Green, LineStyle.Solid, 2 ); // DIPlus and DIMinus require stabilizing so start the bar count 3 to 4 times their period for(int bar = 50; bar < Bars.Count; bar++) { if( DIPlus.Series( Bars, 14 )[bar] > 40 ) DrawLine( PricePane, bar, Low[bar], bar, 0, Color.Green, LineStyle.Dotted, 2 ); } } } }