Detailed Description of Dagra: Digitize graphical data 1.2.2

Dagra helps you digitize numerical data from printed graphs. With Dagra, you use Bezier curves to trace the data, rather than tediously clicking on a large number of points. You simply click a point on the data, then drag to indicate the curve's tangent at that point. Usually 5-10 Bezier points are more than enough to describe even complex shapes.

Data you trace in Dagra can be used in nearly any data analysis or plotting package. Traced data can be exported to tab- or comma-delimited text files or simply transferred using the Windows Clipboard. Add-ins for common analysis tools let you work with Dagra files directly from your favorite software.

Dagra comes with a Microsoft Excel add-in letting you load data directly from Dagra documents into Microsoft Excel. The add-in places an Import Dagra File on Excel's Tools menu. When a Dagra file is opened, a new sheet is created containing the data traced.

Dagra's MathCad component lets you insert Dagra data directly into your Worksheet. Dagra data can be used much the same way as values in a MathCad table component. Typically you would define a MathCad function to return values from the interpolated data.

It is easy to get graphical images of data into Dagra for tracing. Many import formats are supported including:

* Bitmap (BMP)
* Graphic interchange format (GIF)
* Joint photographic experts group (JPG, JPEG)
* Portable network graphics (PNG)
* Tagged image format (TIF, TIFF)
* Windows meta files (WMF)
* Enhanced windows meta files (WMF)

Dagra will also import images directly from the clipboard. This is ideal for pulling graphs from Adobe Acrobat (PDF) files, a format commonly used for published papers and data sheets.

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