The main purpose of EDTECH software for Windows is to easily produce excellent printed black-and-white scientific-style plots and other line graphics, as printed pages and as black-and-white graphics files (.emf, .pcx, or .jpg) up to 2400 by 3000 pixels in size, which you can embed in word processor documents. The graphics also appear for editing on the VGA screen, but the initial screen display of your drawing (or a normal size image presented on a web page) is a preliminary view with about 1/3 the resolution of the printed image.
The old DOS version of EDTECH provided graphics support for the advanced projects of Payne Dynafoils, Inc. for over 6 years. Thus EDTECH is actually a rather old program and does not conform to certain modern conventions, but we find it extremely useful. EDTECH graphic images are painted bit maps rather than graphic objects like in Microsoft Excel. Therefore, you cannot drag and stretch them with the mouse. If you want to change them you must erase and redraw them (there is an Un-draw mode for erasing and several other ways to erase and modify drawings).
Features of EDTECH include:
Various features assist you in rapidly obtaining a good presentation of your data. The old-style EDTECH text fonts include the Greek alphabet and various symbols. If you select normal Windows-based text fonts you can include the Windows Symbols font.
For screening large amounts of data quickly the default graph style has relatively small point sizes, axis tick spacings, etc., and is located at the top of the page where it is immediately visible through the drawing window. Its scaling is entirely automatic. After initial examination of your data you can adjust axis sizes, positioning on the page, scaling details, fonts, etc. and replot.
A sample page of simple graphs shows a simple plot of 5 points with their regression fit in the default position and style at the top of the page. Then the plot was repeated at various positions and sizes to show how these can vary. The scaling remained automatic but minor adjustments to a tick spacing parameter were made. This page shows the largest and smallest point sizes. It was converted to PDF format since this is the best way to show EDTECH graphics in a way immediately accessible to most peoples' web browsers.
A page of multiple graphs from an actual technical report can also be printed to see the high density of details possible. This page was created from a large amount of computer-generated data. This page was actually created about 1996 with the DOS version of EDTECH, and the font styles are the old EDTECH ones which are not as good looking as the usual Windows styles that we frequently select since version 3.2 in 1999. Again it has been converted to PDF.
The "bar-connect" feature of EDTECH graph plotting was originally intended for drawing "error bars" (Bar Sample 1) but it can also be used for unusual applications such as drawing histograms or plots such as Bar Sample 2, in which vertical and horizontal bars are both present.
A DMSolver solution to a kinetics problem is an example of graphs for which many user-typed annotations were applied to the drawing.
While the normal way of operating EDTECH is through menus, mouse, and keystrokes, you can write a set of "batch" commands to perform many functions. The user's Fortran, Basic, Pascal, C, etc. analysis programs can output data to be read and automatically plotted by EDTECH through the "batch" feature. For example, a component program of the Flowsheet Toolkit created the data and a file of batch commands to make Bar Sample 1. These commands added a label derived from the name in the database (Acetone_EtOH) of the set of data series used in the analysis and also drew the numeric parameter results of the analysis. When you are developing automatic plots you typically do them interactively first, setting various styling parameters, and then write the code in your Fortran, etc., program to make use of the styles that have been established. Other examples produced by Digital Analytics' programs working through EDTECH include binary mixture vapor pressure with temperature as parameter (Flash Calculator examples 1 and 2), and bubble and dewpoints of a given composition (Flash Calculator example 3), as well as the Distillation Guide output Bar Sample 2. Also, see boat lines (by the B3DBOAT program) in our technical paper about the BOAT3D program (this report also contains many conventional interactively-produced graphs).