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/usr/share/ncarg/hluex/app/ap01c.c is in libncarg-data 6.4.0-9.

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#include <ncarg/hlu/hlu.h>
#include <ncarg/hlu/App.h>
#include <ncarg/hlu/NcgmWorkstation.h>
#include <ncarg/hlu/PSWorkstation.h>
#include <ncarg/hlu/PDFWorkstation.h>
#include <ncarg/hlu/CairoWorkstation.h>
#include <ncarg/hlu/TextItem.h>

int main()
{
    int appid, workid, textid;
    int rlist;
    char const *wks_type = "x11";

    /*
     * Initialize the HLU library.
     */
    NhlInitialize();

    /*
     * Create a ResList.  The ResList is a dynamic list of the resources
     * and values being explicitly set during the "NhlCreate" function.
     */
    rlist = NhlRLCreate(NhlSETRL);

    /*
     * Create an App object so we can have an application specific
     * resource file for this example.  Since the App object is the
     * one that reads in the application specific resource files,
     * these resources must be set programmatically.  (They could
     * be set in the $(NCARG_SYSRESFILE) or $(NCARG_USRRESFILE), but
     * these things are pretty specific to this example, so I am
     * setting them programmatically.)
     */
    NhlRLClear(rlist);
    NhlRLSetInteger(rlist,NhlNappDefaultParent,True);
    NhlRLSetString(rlist,NhlNappUsrDir,"./");
    NhlCreate(&appid,"ap01",NhlappClass,NhlDEFAULT_APP,rlist);

    /*
     * Create the Workstation to manage the output device.
     * Since the NhlNappDefaultParent resource was set to True for
     * "ap01", we can use either the constant NhlDEFAULT_APP or
     * appid as the Parent id.  They mean the same thing.
     */
    if (!strcmp(wks_type,"ncgm") || !strcmp(wks_type,"NCGM")) {
        /*
         * Create a meta file workstation.
         */
        NhlRLClear(rlist);
        NhlRLSetString(rlist,NhlNwkMetaName,"./ap01c.ncgm");
        NhlCreate(&workid,"x",NhlncgmWorkstationClass,NhlDEFAULT_APP,
				  rlist);
    }
        else if (!strcmp(wks_type,"x11") || !strcmp(wks_type,"X11")) {
        /*
         * Create an X workstation.
         */
        NhlRLClear(rlist);
        NhlRLSetInteger(rlist,NhlNwkPause,True);
        NhlCreate(&workid,"x",NhlcairoWindowWorkstationClass,NhlDEFAULT_APP,
				  rlist);
        }
    else if (!strcmp(wks_type,"oldps") || !strcmp(wks_type,"OLDPS")) {
        /*
         * Create an older-style PostScript workstation.
         */
        NhlRLClear(rlist);
        NhlRLSetString(rlist,NhlNwkPSFileName,"./ap01c.ps");
        NhlCreate(&workid,"x",NhlpsWorkstationClass,NhlDEFAULT_APP,
				  rlist);
    }
    else if (!strcmp(wks_type,"oldpdf") || !strcmp(wks_type,"OLDPDF")) {
        /*
         * Create an older-style PDF workstation.
         */
        NhlRLClear(rlist);
        NhlRLSetString(rlist,NhlNwkPDFFileName,"./ap01c.pdf");
        NhlCreate(&workid,"x",NhlpdfWorkstationClass,NhlDEFAULT_APP,
				  rlist);
    }
    else if (!strcmp(wks_type,"pdf") || !strcmp(wks_type,"PDF") ||
 	     !strcmp(wks_type,"ps") || !strcmp(wks_type,"PS")) {
        /*
         * Create a cairo PS or PDF workstation.
         */
        NhlRLClear(rlist);
        NhlRLSetString(rlist,NhlNwkFileName,"./ap01c");
        NhlRLSetString(rlist,NhlNwkFormat,(char*)wks_type);
        NhlCreate(&workid,"x",NhlcairoDocumentWorkstationClass,NhlDEFAULT_APP,
				  rlist);
    }
    else if (!strcmp(wks_type,"png") || !strcmp(wks_type,"PNG")) {
        /*
         * Create a cairo PNG workstation.
         */
        NhlRLClear(rlist);
        NhlRLSetString(rlist,NhlNwkFileName,"./ap01c");
        NhlRLSetString(rlist,NhlNwkFormat,(char*)wks_type);
        NhlCreate(&workid,"x",NhlcairoImageWorkstationClass,NhlDEFAULT_APP,
				  rlist);
    }

    /*
     * Destroy the ResList.
     * Since I am not setting any more resources programmatically, I
     * don't need the ResList anymore.
     */
    NhlRLDestroy(rlist);

    /*
     * Create a TextItem.  I am not programmatically setting any of
     * the TextItem resources, so the Resource Database made up from
     * the resource files read-in by the "ap01" App object is specifying
     * all the attributes to the TextItem.
     */
    NhlCreate(&textid,"tx1",NhltextItemClass,workid,0);

    /*
     * Call draw on the Workstation Object.  This will cause all of the
     * Workstation's children to Draw.  In this case, this is only
     * "tx1", so draw could have been called on it, just as easily.
     */
    NhlDraw(workid);

    /*
     * Call frame on the Workstation Object.  This is functionally
     * equivalent to calling NhlUpdateWorkstation, and then
     * NhlClearWorkstation.
     */
    NhlFrame(workid);

    /*
     * Destroying an object also destroy's it's children, so by destroying
     * "ap01", all of the objects get destroyed.
     */
    NhlDestroy(appid);

    /*
     * Close the HLU library.  This free's up most of the dynamic memory
     * the HLU library allocates.
     */
    NhlClose();

    exit(0);
}