/usr/share/ncarg/hluex/primitives/pr05c.c is in libncarg-data 6.4.0-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* $Id: pr05c.c,v 1.5 2010-03-15 22:49:24 haley Exp $
*/
/***********************************************************************
* *
* Copyright (C) 1993 *
* University Corporation for Atmospheric Research *
* All Rights Reserved *
* *
***********************************************************************/
/*
* File: pr05c.c
*
* Author: David Brown
* National Center for Atmospheric Research
* PO 3000, Boulder, Colorado
*
* Date: Fri Oct 14 11:42:41 MDT 1994
*
* Description: Demonstrates graphics primitives drawn in data
* space over a MapPlot. Data polygons are used to
* color global zones and data polylines mark the
* zonal boundaries. Line labels name the boundary
* lines (e.g. arctic circle). Markers are drawn at
* the poles. The three frames present three
* different map projections, showing how the
* primitives adapt to various levels of distortion.
*
* Note: beginning with NCL 6.2.0 the rules for drawing polylines (and to some extent polygons) changed.
* Prior to 6.2.0 you could draw a polyline that spanned the globe using only 2 points with longitudes 0 and 360.
* However, this created difficult to resolve ambiguities when dealing with lines that cross the cyclic point of
* of longitude. Therefore, the rule was adapted that the path between two specified points always takes the
* shortest path around the globe, meaning that a line between 0 and 360 is of length 0 in longitude. Therefore it
* now takes at least 3 points (0., 180, 360.) and preferably 4 points (eliminating all possible ambiguity)
* to draw a line spanning the globe in longitude. This script has been modified to work with the new rule.
*/
#include <stdio.h>
#include <math.h>
#include <ncarg/gks.h>
#include <ncarg/ncargC.h>
#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/MapPlot.h>
int main(int argc, char *argv[])
{
char const *wks_type = "x11";
int rlist;
int appid,wid,canvas,gsid;
int i;
float px[9];
float py[9];
char *projection[] = {"orthographic","mollweide","stereographic","lambertequalarea"};
/*
* Initialize the high level utility library
*/
NhlInitialize();
/*
* Create an application context. Set the app dir to the current
* directory so the application looks for a resource file in the working
* directory.
*/
rlist = NhlRLCreate(NhlSETRL);
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNappUsrDir,"./");
NhlCreate(&appid,"pr05",NhlappClass,NhlDEFAULT_APP,rlist);
if (!strcmp(wks_type,"ncgm") || !strcmp(wks_type,"NCGM")) {
/*
* Create a meta file workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkMetaName,"./pr05c.ncgm");
NhlCreate(&wid,"pr05Work",
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(&wid,"pr05Work",NhlcairoWindowWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"oldps") || !strcmp(wks_type,"OLDPS")) {
/*
* Create an older-style PostScript workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkPSFileName,"pr05c.ps");
NhlCreate(&wid,"pr05Work",NhlpsWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"oldpdf") || !strcmp(wks_type,"OLDPDF")) {
/*
* Create an older-style PDF workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkPDFFileName,"pr05c.pdf");
NhlCreate(&wid,"pr05Work",NhlpdfWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"pdf") || !strcmp(wks_type,"PDF") ||
!strcmp(wks_type,"ps") || !strcmp(wks_type,"PS")) {
/*
* Create a cairo PS/PDF workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkFileName,"pr05c");
NhlRLSetString(rlist,NhlNwkFormat,(char*)wks_type);
NhlCreate(&wid,"pr05Work",NhlcairoDocumentWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"png") || !strcmp(wks_type,"PNG")) {
/*
* Create a cairo PNG workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkFileName,"pr05c");
NhlRLSetString(rlist,NhlNwkFormat,(char*)wks_type);
NhlCreate(&wid,"pr05Work",NhlcairoImageWorkstationClass,appid,rlist);
}
/*
* Create a MapPlot that covers the entire NDC space
* to use as a drawing canvas
*/
NhlRLClear(rlist);
NhlRLSetFloat(rlist,NhlNvpXF,0.0);
NhlRLSetFloat(rlist,NhlNvpYF,1.0);
NhlRLSetFloat(rlist,NhlNvpWidthF,1.0);
NhlRLSetFloat(rlist,NhlNvpHeightF,1.0);
NhlCreate(&canvas,"canvas",NhlmapPlotClass,wid,rlist);
/*
* Create a GraphicStyle to control the primitive attributes.
*/
NhlRLClear(rlist);
NhlCreate(&gsid,"style",NhlgraphicStyleClass,wid,rlist);
for (i = 0; i < 4; i++) {
/*
* Set the map projection
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNmpProjection,projection[i]);
NhlSetValues(canvas,rlist);
/*
* Draw polygons representing the 5 major zones of the globe, beginning
* with the tropical zone.
* Turn edges off and set the marker color.
*/
NhlRLClear(rlist);
NhlRLSetInteger(rlist,NhlNgsMarkerColor,0);
NhlRLSetString(rlist,NhlNgsEdgesOn,"false");
NhlRLSetInteger(rlist,NhlNgsFillColor,2);
NhlSetValues(gsid,rlist);
py[0] = -23.5;
py[1] = 23.5;
py[2] = 23.5;
py[3] = 23.5;
py[4] = 23.5;
py[5] = -23.5;
py[6] = -23.5;
py[7] = -23.5;
py[8] = -23.5;
px[0] = 360.;
px[1] = 360.;
px[2] = 240.;
px[3] = 120.;
px[4] = 0.;
px[5] = 0.;
px[6] = 120.;
px[7] = 240.;
px[8] = 360.;
NhlDataPolygon(canvas,gsid,px,py,9);
/*
* Next draw the north and south temperate zones
* Note the px array does not need to change for the next four NhlDataPolygon draws
*/
NhlRLClear(rlist);
NhlRLSetInteger(rlist,NhlNgsFillColor,3);
NhlSetValues(gsid,rlist);
py[0] = 23.5;
py[1] = 66.5;
py[2] = 66.5;
py[3] = 66.5;
py[4] = 66.5;
py[5] = 23.5;
py[6] = 23.5;
py[7] = 23.5;
py[8] = 23.5;
NhlDataPolygon(canvas,gsid,px,py,9);
py[0] = -23.5;
py[1] = -66.5;
py[2] = -66.5;
py[3] = -66.5;
py[4] = -66.5;
py[5] = -23.5;
py[6] = -23.5;
py[7] = -23.5;
py[8] = -23.5;
NhlDataPolygon(canvas,gsid,px,py,9);
/*
* Draw the frigid zones
*/
NhlRLClear(rlist);
NhlRLSetInteger(rlist,NhlNgsFillColor,4);
NhlSetValues(gsid,rlist);
py[0] = 90.;
py[1] = 66.5;
py[2] = 66.5;
py[3] = 66.5;
py[4] = 66.5;
py[5] = 90.;
py[6] = 90.;
py[7] = 90.;
py[8] = 90.;
NhlDataPolygon(canvas,gsid,px,py,9);
py[0] = -90.;
py[1] = -66.5;
py[2] = -66.5;
py[3] = -66.5;
py[4] = -66.5;
py[5] = -90.;
py[6] = -90.;
py[7] = -90.;
py[8] = -90.;
NhlDataPolygon(canvas,gsid,px,py,9);
/*
* Draw the map outlines and grid
*/
NhlDraw(canvas);
/*
* Draw markers at each pole
*/
px[0] = 0;
px[1] = 0;
py[0] = 90;
py[1] = -90;
NhlDataPolymarker(canvas,gsid,px,py,2);
/*
* Draw polylines at each of the major latitudinal boundary lines,
* beginning with the equator. Use the line label to name each of the
* lines. The '|' character is inserted between each label character
* to allow the labels to track the curve of each line more precisely.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNgsLineLabelString,"e|q|u|a|t|o|r");
NhlSetValues(gsid,rlist);
px[0] = 0;
px[1] = 120.0;
px[2] = 240.0;
px[3] = 360.0;
py[0] = 0;
py[1] = 0;
py[2] = 0;
py[3] = 0;
NhlDataPolyline(canvas,gsid,px,py,4);
/*
* Tropic of cancer
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNgsLineLabelString,
"t|r|o|p|i|c o|f c|a|n|c|e|r");
NhlSetValues(gsid,rlist);
py[0] = 23.5;
py[1] = 23.5;
py[2] = 23.5;
py[3] = 23.5;
NhlDataPolyline(canvas,gsid,px,py,4);
/*
* Tropic of capricorn (Note: currently there is a limit on the
* number of characters in a line label that prevents the '|'
* character from being used between each letter in a label
* of this length).
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNgsLineLabelString,
"tr|o|p|ic of c|a|p|r|i|c|o|rn");
NhlSetValues(gsid,rlist);
py[0] = -23.5;
py[1] = -23.5;
py[2] = -23.5;
py[3] = -23.5;
NhlDataPolyline(canvas,gsid,px,py,4);
/*
* Arctic circle
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNgsLineLabelString,
"a|r|c|t|i|c c|i|r|c|l|e");
NhlSetValues(gsid,rlist);
py[0] = 66.5;
py[1] = 66.5;
py[2] = 66.5;
py[3] = 66.5;
NhlDataPolyline(canvas,gsid,px,py,4);
/*
* Antarctic circle
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNgsLineLabelString,
"|a|n|t|a|r|c|t|i|c c|i|r|c|l|e");
NhlSetValues(gsid,rlist);
py[0] = -66.5;
py[1] = -66.5;
py[2] = -66.5;
py[3] = -66.5;
NhlDataPolyline(canvas,gsid,px,py,4);
NhlFrame(wid);
}
NhlClose();
exit(0);
}
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