creating a histogram from a bargraph

I am able to create a bar graph using BIRT charting Engine. How do I convert it into a histogram (how do I make the width of the bars longer)?

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mwilliams

Hi MC,

One thing you might be able to do is use an area type chart instead of a bar chart to create something like a histogram.

markcheung

Looking at the area chart from the IBM example, I don't think it fits what I have in mind.<br />
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What I wanted is something like this: <a class='bbc_url' href='http://www.eclipsezone.com/servlet/JiveServlet/download/18209-70381-92013010-4546/historgram.png'>http://www.eclipsezone.com/servlet/JiveServlet/download/18209-70381-92013010-4546/historgram.png</a> and I am creating with BIRT Charting Engine.<br />
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My histograms should be able to gather data from a DateTimeDataSet and estimate a good starting time and bin width (adjustable). It would counts the number datums in a time frame and graphs the number with a rectangle bar. I would like there to be no spaces between the bar (unless there is no data in that time frame).

markcheung

Solve the no space problem.

Simply:
chart.setUnitSpacing(0);

Is there a function in BIRT to calculate histogram spacing+initial value for datetimedataset x-axis?