Tutorial 151 | Syncing lines between two charts using the Global Dictionary

Tutorial151 Banner Image

Tutorial 151 demonstrates how to create TradeStation EasyLanguage programs to ‘sync’ lines between two charts using the Global Dictionary. The technique could be useful, for example, if you were using a program that was protected (i.e. you cannot see the code or modify it) that produced drawing objects on a chart. You might wish to replicate those drawing objects on another chart.

Tutorial 151 shows a way of doing this with horizontal lines drawn by an example program (included in the download).

Programs applied to the ‘sending chart’
_Tutorial151-DrawLines Generates horizontal lines, somewhat randomly and modifies their colors, styles and weights
_Tutorial151-ScrapeDrawingObjectData Analyzes the chart and stores the horizontal lines and their attributes in a Global Dictionary
Program applied to the receiving chart
_Tutorial151-ReadDictionary Reads the Global Dictionary and draws the lines and their attributes on the ‘receiving’ chart. Adds additional horizontal lines if they are drawn on the sending chart.

Tutorial program overviews

_Tutorial151-ScrapeDrawingObjectData inputs

When first applied to a chart _Tutorial151-ScrapeDrawingObjectData inputs stores all horizontal lines (either created by a program or drawn by a user) into a Global Dictionary. For each line the following information is stored:

  • The price level
  • The color (infact the A (alpha), R (red), G (green), and B (blue) values are stores seperately
  • The style of the line
  • The weight of the line

These values are first added to a vector and then the vector is stored in the Global Dictionary.

The program monitors the chart using a timer. Each time a Timer events fires the program checks to see if any new lines have been added. If so those lines are added to the Global Dictionary.

If horizontal lines have been deleted the program throws a recalculate exception so that all the lines are reanalyzed and stored in the dictionary.

_Tutorial151-ReadDictionary

Adding a horizontal line using the drawing tool

_Tutorial151-ReadDictionary is applied to the ‘receiving’ chart (i.e. the chart that you want the lines to be replicated from the sending chart.  The program reads the global dictionary when it is first applied and draws the horizontal lines on the chart (matching their price, color, weight, and style attributes).

This program uses the Global Dictionary item added update event. When this is fired because one or more lines have been added to the chart, it draws the new lines on the receiving chart.

In the event that a line is deleted on the sending chart, the sending chart reanitializes and all the lines are added to the Gloabl Dictionary again. When this occurs the receiving chart delets all the horizontal lines on the chart and then re-draw all the lines.

_Tutorial151-ScrapeDrawingObjectData inputs

int iInterval1( 50000 ), // Interval for the timer
string ShareRef( “Send1” ); // Unique name to differentiate the Global Dictionary

_Tutorial151-ReadDictionary

string ShareRef( “Send1” ); // Unique name to differentiate the Global Dictionary

The ShareRef input must be the same string for the sending and receiving charts for them to be able to share data.

Detecting when a horizontal line is added in the sending program

Tutorial 151 uses a timer event to continuously check the chart every so many milli-seconds (the user input  iInterval1 in _Tutorial151-ScrapeDrawingObjectData.

With horizontal lines drawn using the drawing tools, the charting host could have been used to detect when a line was added to the chart. Unfortunately this would not work for lines added programatically after the sending program was first applied to the chart.

These programs have various  limitations by design in order to make them easier to understand.The following are some of the limitations:

  • The tutorial programs only recognize horizontal line drawing objects (as opposed to vertical lines, trendlines etc)
  • They do not recognize legacy drawing objects (lines produced by TL_New(… syntax)
  • They do not take a ccount of when a horizontal line is moved on the sending chart (with the exception of if it is applied and moved before the timer elapsed event occurs)
  • When lines are deleted on the sending chart and remain deleted when the timer event fires the sender program throws a recalculate exception. This is not the most elegant solution and would effect other programs applied to the ‘sending’chart, however it is a simple solution.
  • When a line is applied to the chart its details are added to the Global Dictionary when the Timer event fires. If the line is subsequently deleted and a new line added before the Timer event fires again, the program does not recognize the deletion and addition. This is not a problem when the timer interval is set suffiently low.

For Gold Pass members

The following section conatins the code for _Tutorial151-Drawlines, the program that draws the randomly positioned, colored, styled and weighted lines:

This content is for members only.

 

Programming lessons and examples included in tutorial 151:

  • Using the global dictionary and vectors
  • Storing a vector in a global dictionary
  • Using the global dictionary item added update event
  • Using a timer object
  • Getting price, color, style and weight attributes from a horizontal line
  • Processing colors
  • Drawing horizontal lines and applying price, color, style and weight attributes
  • Using methods to simplify code

The three programs described in this tutorial (_Tutorial151-DrawLines,  _Tutorial151-ScrapeDrawingObjectData, _Tutorial151-ReadDictionary) are available for immediate download for $44.95. The download is a TradeStation ELD file that includes the unprotected and commented program. This program will not work in MultiCharts because it uses the TradeStation collections and other functionality that is not available in the MultiCharts environment.

Part 1 | Summary of tutorial 151 and description of _Tutorial151-Drawlines

Part 2 | Description of _Tutorial151-ScrapeDrawingObjectData

Part 3 | Description of _Tutorial151-ReadDictionary


Please email if you find any bugs, notice any errors, or have questions about the tutorial.

THESE INDICATORS, SHOW ME STUDIES, STRATEGIES AND OTHER PROGRAMS HAVE BEEN INCLUDED SOLELY FOR EDUCATIONAL PURPOSES.

TO THE BEST OF MARKPLEX CORPORATION’S KNOWLEDGE, ALL OF THE INFORMATION ON THIS PAGE IS CORRECT, AND IT IS PROVIDED IN THE HOPE THAT IT WILL BE USEFUL. HOWEVER, MARKPLEX CORPORATION ASSUMES NO LIABILITY FOR ANY DAMAGES, DIRECT OR OTHERWISE, RESULTING FROM THE USE OF THIS INFORMATION AND/OR PROGRAM(S) DESCRIBED, AND NO WARRANTY IS MADE REGARDING ITS ACCURACY OR COMPLETENESS. USE OF THIS INFORMATION AND/OR PROGRAMS DESCRIBED IS AT YOUR OWN RISK.

ANY EASYLANGUAGE OR POWERLANGUAGE TRADING STRATEGIES, SIGNALS, STUDIES, INDICATORS, SHOWME STUDIES, PAINTBAR STUDIES, PROBABILITYMAP STUDIES, ACTIVITYBAR STUDIES, FUNCTIONS (AND PARTS THEREOF) AND ASSOCIATED TECHNIQUES REFERRED TO, INCLUDED IN OR ATTACHED TO THIS TUTORIAL OR PROGRAM DESCRIPTION ARE EXAMPLES ONLY, AND HAVE BEEN INCLUDED SOLELY FOR EDUCATIONAL PURPOSES. MARKPLEX CORPORATION. DOES NOT RECOMMEND THAT YOU USE ANY SUCH TRADING STRATEGIES, SIGNALS, STUDIES, INDICATORS, SHOWME STUDIES, PAINTBAR STUDIES, PROBABILITYMAP STUDIES, ACTIVITYBAR STUDIES, FUNCTIONS (OR ANY PARTS THEREOF) OR TECHNIQUES. THE USE OF ANY SUCH TRADING STRATEGIES, SIGNALS, STUDIES, INDICATORS, SHOWME STUDIES, PAINTBAR STUDIES, PROBABILITYMAP STUDIES, ACTIVITYBAR STUDIES, FUNCTIONS AND TECHNIQUES DOES NOT GUARANTEE THAT YOU WILL MAKE PROFITS, INCREASE PROFITS, OR MINIMIZE LOSSES.

Disclaimer The information, materials, products and services on this Web site are made available subject to the following terms and conditions. Markplex Corporation reserves the right to change these terms and conditions at its sole discretion. This Web site and any downloads, videos, tutorials, programs and information contained herein is presented solely for educational, informational, and/or entertainment use and under no circumstances should be used for actual trading. We at Markplex Corporation are not Broker/Dealers, Financial Advisers or Registered Analysts. No offer or solicitation to buy or sell securities, securities derivatives, futures products or off-exchange foreign currency (forex) transactions of any kind, or any type of trading or investment advice, recommendation or strategy, is made, given or in any manner endorsed by Markplex Corporation. You are fully responsible for any investment or trading decisions you make. Futures and options trading has a large potential risk. You must be aware of the risks and be willing to accept them in order to invest in the futures and options markets. This Web site is neither a solicitation nor an offer to buy and/or sell futures or options. No representation is being made that any account will or is likely to achieve profits or losses similar to those discussed on this Web site. Past performance, whether actual or indicated by historical tests of strategies, is no guarantee of future performance or success. No warranties of profitability are being made or given. There is a possibility that you may sustain a loss equal to or greater than your entire investment regardless of which asset class you trade (equities, options futures or forex); therefore, you should not invest or risk money that you cannot afford to lose. CFTC RULE 4.41 - Hypothetical or simulated performance results have certain inherent limitations. Unlike an actual performance record, simulated results do not represent actual trading. Also, since the trades have not actually been executed, the results may have under- or over-compensated for the impact, if any, of certain market factors, such as lack of liquidity. Simulated trading programs in general are also subject to the fact that they are designed with the benefit of hindsight. No representation is being made that any account will or is likely to achieve profits or losses similar to those shown. Screen shots on this site are examples and are not meant to imply that any of the programs or tutorials available on this Web site will generate profitable trades. EasyLanguage or PowerLanguage trading strategies, signals, studies, indicators, showme studies, paintbar studies, probabilitymap studies, activitybar studies, functions (and parts thereof) and associated techniques referred to, included in or attached to this tutorial or program description are examples only, and have been included solely for educational, informational, and entertainment use. Markplex Corporation does not recommend that you use any such trading strategies, signals, studies, indicators, showme studies, paintbar studies, probabilitymap studies, activitybar studies, functions (or any parts thereof) or techniques. The use of any such trading strategies, signals, studies, indicators, showme studies, paintbar studies, probabilitymap studies, activitybar studies, functions and techniques does not guarantee that you will make profits, increase profits, or minimize losses. Markplex Corporation assumes no liability for any damages, direct or otherwise, resulting from the use of this information and/or program(s) described, and no warranty is made regarding its accuracy or completeness. Use of this Web site including the information, tutorials and/or programs included on it is at your own risk. You shall indemnify and hold Markplex Corporation harmless from any and all liability, loss, trading losses, costs, damage, or expense, including attorneys' fees you or third party may suffer (other than damage to your tangible property or injuries to employees occurring during the course of work) as a result of claims, demands, costs, or judgments arising out of third party and any other claims based on Markplex Corporation's performance, including, but not limited to losses resulting from the use of Markplex Corporation developed software, programs, web sites, tutorials, or the TradeStation charting and/or trading platform. Any testimonials on this Web site may not be representative of the experience of other clients and are not indicative of future results or success.
This Web site contains or may contain references and links to other companies and/or their Web sites, none of which is under the control of Markplex Corporation. Markplex Corporation makes no representations, warranties or endorsements whatsoever about any other Web sites to which you may have access through the Markplex Corporation Web site, or any products or services of those other companies, even if the products or services of those other companies or their Web sites are described or offered on the Markplex Corporation Web site or integrated with Markplex Corporation's products or services. TradeStation®, EasyLanguage® and PowerEditor® are registered trademarks of TradeStation Technologies, Inc. Other brand and product names which appear on this site are the trademarks or service marks of their respective owners, including: Microsoft® is a registered trademark in the United States Microsoft®Excel® is a registered trademark of Microsoft® Neither TradeStation Technologies nor any of its affiliates has reviewed, certified, endorsed, approved, disapproved or recommended, and neither does or will review, certify, endorse, approve, disapprove or recommend, any product or service that offers training, education or consulting regarding the use of EasyLanguage.

By continuing to use and navigate our sites, services, applications, tools or messaging, you are agreeing to our Terms and Conditions and the use of cookies, web beacons and similar technologies as described in our Privacy Policy and Privacy Policy on the use of cookies.

Cookie settings

Below you can choose which kind of cookies you allow on this website. Click on the "Save cookie settings" button to apply your choice.

FunctionalOur website uses functional cookies. These cookies are necessary to let our website work.

AnalyticalOur website uses analytical cookies to make it possible to analyze our website and optimize for the purpose of a.o. the usability.

Social mediaOur website places social media cookies to show you 3rd party content like YouTube and FaceBook. These cookies may track your personal data.

AdvertisingOur website places advertising cookies to show you 3rd party advertisements based on your interests. These cookies may track your personal data.

OtherOur website places 3rd party cookies from other 3rd party services which aren't Analytical, Social media or Advertising.