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## 6.7 Box and Stock charts

JpGraph offers two variation on what is usually known as stock charts, candle-charts or box plot.

### 6.7.1 Stock Charts

Stock charts is used to display data values where one is interested in 4 different values for each data point. This could for example be used to display a stock's open,close, min and max value during a specific day. Hence the name Stock chart (or Stock plot).

The figure below illustrates a sample Stock chart plot

Figure 1: A simple stock plot [src]

For this type of plot the Y-data array must be consist of a number of quadruples of data where each quadruple consists of (open,close,min,max). The open and close values determine the min max for the middle bar and the min,max determine the end points of the "error-lines" at the top and bottom of of each bar.

Note that the data follows the following rules

- min < max
- min < min(open.close)
- max > max(open,close)

To separate the two cases where "open > close" or "open < close " different colors are used. These colors are specified with the SetColor() method. By default a positive bar (close > open) have a fill color of white and for the negative case where (close < open) the bars have a red color.

You can specify the width of the bar by setting the width (in pixels) with a call to the method SetWidth()

The final variation of stock plots you can have is to determine whether or not the end point for the min,max lines should have the horizontal line marking the end of the line or not. This can be adjusted with a call to method HideEndLine().

### 6.7.2 BoxPLots : Stock charts with a median line

A minor variation of stock charts is the "BoxPlot()" this is almost the same as StockPlot() but with the very small difference that in addition to the open,close,min, max values you also specify a median value . The median lies between the open and close value and is illustrated as a horizontal line within the bar.

Figure 2: A simple box type stock plot [src]

You may modify the median line color for positive and negative data points / bars by using the SetMedianColor() method.

### 6.7.3 Image maps for Box and Stock charts

In the same way as for other plots you may associate an image map with these plots. The "hot" area for each plot is the mid "bar" section. In the same way as other plot types you use the SetCSIMTargets() to set the URL's you want to use.

Note: These plot types, though normally used without explicit X-values, can of course handle a supplied X-coordinate array without any problem.

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