Common Question 13

How do I create a High-Low Bar, High-Low-Close, Open-High-Low-Close, or Box Plot (Candle Stick) graph?

These types of graphs actually require multiple subsets to define different aspects of the plotting graphics. When constructing one of these types of graphs, first make sure you are setting the Subsets property to an appropriate value.

Graph Type	Subsets	Subset Order
High-Low Bar	2	BarStart - BarEnd
High-Low-Close	3	LineStart - LineEnd - Close
Open-High-Low-Close	4	LineStart - LineEnd - Open - Close
Candle-Stick (BoxPlot)	4	LineStart - LineEnd - BoxStart - BoxEnd

You then set PlottingMethod to SpecificPlotMode and also set the SpecificPlotMode appropriately.

For example, if you wanted to produce a High-Low Bar (requires 2 subsets) along with 1 comparison line showing the mid point of each bar.

Pego1.Subsets = 3

Pego1.Points = 4

Pego1.YData(0, 0) = 100: Pego1.YData(0, 1) = 150

Pego1.YData(0, 2) = 200: Pego1.YData(0, 3) = 250

Pego1.YData(1, 0) = 200: Pego1.YData(1, 1) = 250

Pego1.YData(1, 2) = 300: Pego1.YData(1, 3) = 350

Pego1.YData(2, 0) = 150: Pego1.YData(2, 1) = 200

Pego1.YData(2, 2) = 250: Pego1.YData(2, 3) = 300

Pego1.PlottingMethod = 15 ' 15 = Specific Plot Mode (for Graph)

Pego1.SpecificPlotMode = 1 ' 1 = High-Low Bar

Pego1.ComparisonSubsets = 1 ' One comparison subset

Pego1.PlottingMethodII = 8 ' Comparison Subset as Points + Line

Pego1.SubsetsToLegend(0) = -1 ' Get rid of subset legend area

The above code produces the following image.

$image\CQ13-0.gif$

Creating an Open-High-Low-Close is just as easy. The changes would be to set Subsets to at least 4, and set SpecificPlotMode = PESPM_OHLC (4).

For more information, read about the SpecificPlotMode property.

Within the demo and demo projects, see example 004 or 030.


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