FLOOD00834

• County: Statewide
• Title: Hydraulics Graphics Package - Preliminary
• Date: 8/1/1980
• Prepared For: US
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Educational/Technical/Reference Information

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point, control is returened to the main program. The main program then calls
subroutine "GEOMRD", 1f plotting cross-sections, or "PROREA", if plotting profile
information. As previously mentioned, these subroutines specifically process
HEC-2 formatted input/output data. Control is then transferred to the plotting
subroutine within which all the software/device dependent graphic subroutine calls
are made. Subroutine "PROREA" stores all information before beginning graphical
processing whereas "GEOMRD" processes data one cross-section at a time, then
generates a plot before proceeding to the next cross-section. Supporting these
routines is a user library containing several subroutines including:

..

a. An option checking routine to test the validity of plot options for
a given set of graphics software.

b. A CalComp compatible routine that draws "dashed", "ticked" and
"alphanumeric" lines similar to those of GCS.

c. Three subroutines to process user input in free-formatted structure.

These routines are virtually compiler independent. They currently utilize

"Encode/Decode", but contain optional formatted scratch disk formatted "Read"

and "Write" statements.

d. A scaling routine that has the capability of determining "nice"
minimum and maximum limits even if the user gives only a specification of the
number of units-per-inch, or no specification at all.

e. A point checking and clipping routine to facilitate "windowing in"
on CalComp plots.

,

For the default case, the user obtaines a profile plot of the entire study
;
reach and then, if connected interactively, spec1fies a "window" of any portion

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