Tutorial 72 | Draw horizontal lines (updated version)

A Gold Pass member suggested that I create a tutorial that demonstrates how to draw three parallel horizontal lines on a chart. The spacing between the upper line and the middle line and between the lower line and the middle line to be determined by user inputs. The lines would move as a group by selecting and dragging the middle line. As the middle line is moved the upper and lower lines maintain their distance from it. See the following short video:

The original version of this program was designed for TradeStation 9.0 and below and for MultiCharts. The program no longer functions correctly with TradeStation 9.5 and up, so this new version uses more up to date technologies to achieve, essentially, the same thing.

The original version used syntax such as:

_Mid = TL_New( D, T, origVal, CurrentDate, CurrentTime, origVal );

and

BottomValTxtRef = Text_New( CurrentDate, CurrentTime, BottomVal, NumToStr( BottomVal, 4 ) );

Whereas the new tutorial uses the new drawing objects that became available when TradeStation introduced its object oriented extensions to EasyLanguage.

The following image shows one of the programs included in a downloadable ELD applied to three charts.

The new version of tutorial 72 applied to three charts

The new version of tutorial 72 applied to three charts

In many respects, by using the new drawing objects, including the HorizontalLine Class, is actually simpler that the way used in the ‘legacy version’ of the program. For example, the HorizontalLine Class creates the horizontal line AND text showing its level. This means that we don’t need to add extra functionality such that when the lines move the text also moves AND the text string changes. Other benefits of using this class include:

  • Ease of changing line colors with a vast range of colors (see below)
  • Flexibility and ease in making the lines are solid or various types of dotted/dashed
  • Line transparency
  • The inclusion of an alert object to provide additional properties to enable and configure alert criteria for the horizontal line with many flexible options

I have bundled two programs together. The programs were developed for TradeStation 9.5. They may be downloaded for $19.95:

Alternatively you are welcome to follow the video and retype the code.

In this tutorial I create two programs as follows:

Tutorial 72 first program (_Tutorial72 New Drawing Objects Number 1)

_Tutorial72 New Drawing Objects Number 1 applied to an EURUSD chart

_Tutorial72 New Drawing Objects Number 1 applied to an EURUSD chart

The tutorial program, _Tutorial72 New Drawing Objects Number 1, draws the lines and includes a ChartingHost object such that if the chart is clicked and the mouse button released the price of the middle line is queried and the price levels of the top and bottom lines are recalculated. The top and bottom lines are moved to their new levels.

The lines are drawn with the default color, weight and style.

Inputs

AboveMiddle( 100 ), // Multiple of MinMove / PriceScale above the mid line
BelowMiddle( 200 ), // Multiple of MinMove / PriceScale below the mid line
origVal( GetAppInfo( aiLowestDispValue ) + 0.5 * ( GetAppInfo( aiHighestDispValue ) – GetAppInfo( aiLowestDispValue ) ) ); // Calculates the middle price valus visible on the screen

Tutorial 72 second program (_Tutorial72 New Drawing Objects Number 2)

_Tutorial72 New Drawing Objects Number 2 applied to a chart showing some of the style options available

_Tutorial72 New Drawing Objects Number 2 applied to a chart showing some of the style options available

The second program, _Tutorial72 New Drawing Objects Number 2, is based on the first program, however it provides inputs to also change the line colors, style, and weight.

The font size is changed by double clicking the line. A dialog appears saying: “This drawing object was added by an analysis technique. Do you want to format the analysis technique.” Select NO and then click the labels tab and make adjustments to the typeface. Finally click the ‘default’selection and press the OK button.

Inputs

AboveMiddle( 100 ), // Multiple of MinMove / PriceScale above the mid line
BelowMiddle( 200 ), // Multiple of MinMove / PriceScale below the mid line
origVal( GetAppInfo( aiLowestDispValue ) + 0.5 * ( GetAppInfo( aiHighestDispValue ) – GetAppInfo( aiLowestDispValue ) ) ), // Calculates the middle price valus visible on the screen

TopLineColor( “HotPink” ),
MidLineColor( “Yellow” ),
BottomLineColor( “Orange” ),

TopLineWt( 1 ),
MidLineWt( 3 ),
BottomLineWt( 2 ),

TopLineStyle( 4 ),
MidLineStyle( 5 ),
BottomLineStyle( 5 );

Tutorial 72 | Draw horizontal lines (updated version) video 1

Make sure you set the persist attributes of the top line and the bottom lines correctly:

_Top = HorizontalLine.Create( TopVal );
_Top.Persist = TRUE;
DrawingObjects.Add( _Top );_Bottom = HorizontalLine.Create( BottomVal );
_Bottom.Persist = TRUE;
DrawingObjects.Add( _Bottom );

Tutorial 72 | Draw horizontal lines (updated version) video 2


I have bundled two programs together. The programs were developed for TradeStation 9.5. They may be downloaded for $19.95:

Available colors

AliceBlueDarkSlateGrayLightSalmonPaleVioletRed
AntiqueWhiteDarkTurquoiseLightSeaGreenPapayaWhip
AquaDarkVioletLightSkyBluePeachPuff
AquamarineDeepPinkLightSlateGrayPeru
AzureDeepSkyBlueLightSteelBluePink
BeigeDimGrayLightYellowPlum
BisqueDodgerBlueLimePowderBlue
BlackFirebrickLimeGreenPurple
BlanchedAlmondFloralWhiteLinenRed
BlueForestGreenMagentaRosyBrown
BlueVioletFuschiaMaroonRoyalBlue
BrownGainsboroMediumAquamarineSaddleBrown
BurlywoodGhostWhiteMediumBlueSalmon
CadetBlueGoldMediumOrchidSandyBrown
ChartreuseGoldenrodMediumPurpleSeaGreen
ChocolateGrayMediumSeaGreenSeashell
CoralGreenMediumSlateBlueSienna
CornflowerBlueGreenYellowMediumSpringGreenSilver
CornsilkHoneydewMediumTurquoiseSkyBlue
CyanHotPinkMediumVioletRedSlateBlue
DarkBlueIndianRedMidnightBlueSlateGray
DarkBrownIndigoMintCreamSnow
DarkCyanIvoryMistyRoseSpringGreen
DarkGoldenrodKhakiMoccasinSteelBlue
DarkGrayLavenderNavajoWhiteTan
DarkGreenLavenderBlushNavyTeal
DarkKhakiLawnGreenOldLaceThistle
Dark MagentaLemonChiffonOliveTomato
DarkOliveGreenLightBlueOliveDrabTurquoise
DarkOrangeLightCoralOrangeViolet
DarkOrchidLightCyanOrangeRedWheat
DarkRedLightGoldenrodYellowOrchidWhite
DarkSalmonLightGrayPaleGoldenrodWhiteSmoke
DarkSeaGreenLightGreenPaleGreenYellow
DarkSlateBlueLightPinkPaleTurquoiseYellowGreen

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