From 28994509cc11ac6a5443054dfae1fedfb69039bc Mon Sep 17 00:00:00 2001
From: rsc <devnull@localhost>
Date: Wed, 21 Apr 2004 22:19:33 +0000
Subject: Why not?

---
 src/cmd/map/libmap/conic.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 src/cmd/map/libmap/conic.c

(limited to 'src/cmd/map/libmap/conic.c')

diff --git a/src/cmd/map/libmap/conic.c b/src/cmd/map/libmap/conic.c
new file mode 100644
index 00000000..ba4430c6
--- /dev/null
+++ b/src/cmd/map/libmap/conic.c
@@ -0,0 +1,27 @@
+#include <u.h>
+#include <libc.h>
+#include "map.h"
+
+static struct coord stdpar;
+
+static int
+Xconic(struct place *place, double *x, double *y)
+{
+	double r;
+	if(fabs(place->nlat.l-stdpar.l) > 80.*RAD)
+		return(-1);
+	r = stdpar.c/stdpar.s - tan(place->nlat.l - stdpar.l);
+	*x = - r*sin(place->wlon.l * stdpar.s);
+	*y = - r*cos(place->wlon.l * stdpar.s);
+	if(r>3) return(0);
+	return(1);
+}
+
+proj
+conic(double par)
+{
+	if(fabs(par) <.1)
+		return(Xcylindrical);
+	deg2rad(par, &stdpar);
+	return(Xconic);
+}
-- 
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