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~' )"":!'7 G .." ;.. '" ~I. .. ",. v" Retrieving a water information sheet 19 This display is created by calls to create_plot_window () and add_data_to_row_column (). The graphical display is produced by creating a special fonnat file which is used to spawn an instance of the XMGR graphing tool. The XMGR fonnat file is created by repeated calls to add_data_to_xmgr_file(). The data is broken into separate vectors, or segments, when it is displayed in graphical fonnat and when data is missing from the record. Data averaged over a daily or hourly interval is broken into separate segments when there is no data available for an entire interval. For example, real-time data is broken when no data is available for a tWQ- hour period (this is an arbitrary length of time agreed upon as being long enough to warrant making the missing data obvious to those using the system). When the user displays data in a graph, the function add_data_to_xmgr _f i le ( ) creates a file which provides XMGR with instructions to fonnat the graph. A brief description of that process is included here. See the XMGR documentation for a detailed description of formatting commands. add_data_ to_xmgr _f i 1 e ( ) is called repeatedly (once for each gauge) if the user has selected more than one gauge. The first time the function is called, a temporary file is created and a header is added to the file. The header provides a title for the graph and a fonnat for the axes. The portion of the header that is the same for all graphs is read in from the file $SPLA1TE_D lRlxmgr_fmt/header.fmt. add_data_to_xmgr_file () then converts the x values (which represent time) in the PLOT _DATA_PACKAGE, from hours since the beginning of 1990 to julian dates. Because XMGR uses julian dates for absolute time values, this conversion is necessary. After conversion, the points are added to the format file. '. Subsequent calls to add_data_to_xmgr_file () append data to the fonnat file without the header infonnation. Diversion Plotting Plotting of diversion data uses the same procedures and structures as plotting of gauged data. Some differences are present because the diversion data is available only at a daily interval, so no averaging is available for this type of data. In addition, the data associated with diversion is always of type FLOW, as elevation and storage data does not apply to diversions. The OMI function which returns the diversion data is PLOT_DATA_PACKAGE * Get DailyDiversion {int wd, int sid, cfhar*from_time, char*to_tirne Water Information Sheet The Water Information Sheet, which is the primary mechanism for users to enter data, is stored on a daily interval (one per day) for each of the twelve water districts. When the user chooses a Water Infonnation Sheet to edit, the application creates a new sheet and initializes it with values. A caB to the OMI function LoadlnfoS- heet(int wd, char*date) returns the requested sheet.