Bar.HistogramCriticalValue Property (ExG2antt)

By default, the HistogramCriticalValue property is 100. The HistogramCriticalColor property specifies the color to show the bars that are exceed the critical value. The histogram-chart shows the critical part for the bar ONLY if the HistogramCriticalColor is different that the HistogramColor property.

The critical value is interpreted in different way based on the HistogramType property as follows:

if the HistogramType property is exHistOverload, the critical value indicates a count of bars. So, if the count of bars in the histogram exceeds the critical value they are shown using the critical color. When using exHistOverload you can specify the number of maximum bars being displayed in the histogram using the HistogramItems property. The following screen shot shows the overload histogram, critical value 3, and the ruler displayed on the left side of the histogram displays the count of bars . The red part indicates a portion that has more than 3 bars over.

if the HistogramType property is exHistOverallocation, the critical value indicates a percent value. So, if the allocation of the bar per unit exceeds the critical value the bars are show in the critical color. The work-load for a task is computed as ItemBar(exBarEffort) / length of the bar. The work-load for the task is the work effort / task duration. (i.e. If item.exBarEffort = 1 and gantt bar length is 10 days, then the work-load = 0.1 or 10%). The following screen shots show the critical part in red when exHistOverallocation type is displayed:

		Type	Description
		Double	A double expression that specifies the critical value. The critical value is interpreted in different way based on the HistogramType property. For instance, if the HistogramType property is exHistOverload the HistogramCriticalValue property specifies the count of bars while if the HistogramType property is exHistOverallocation it indicates a percent value.