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/orthographic.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 src/cmd/map/libmap/orthographic.c

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

diff --git a/src/cmd/map/libmap/orthographic.c b/src/cmd/map/libmap/orthographic.c
new file mode 100644
index 00000000..7aac5b15
--- /dev/null
+++ b/src/cmd/map/libmap/orthographic.c
@@ -0,0 +1,35 @@
+#include <u.h>
+#include <libc.h>
+#include "map.h"
+
+
+int
+Xorthographic(struct place *place, double *x, double *y)
+{
+	*x = - place->nlat.c * place->wlon.s;
+	*y = - place->nlat.c * place->wlon.c;
+	return(place->nlat.l<0.? 0 : 1);
+}
+
+proj
+orthographic(void)
+{
+	return(Xorthographic);
+}
+
+int
+olimb(double *lat, double *lon, double res)
+{
+	static int first  = 1;
+	if(first) {
+		*lat = 0;
+		*lon = -180;
+		first = 0;
+		return 0;
+	}
+	*lon += res;
+	if(*lon <= 180)
+		return 1;
+	first = 1;
+	return -1;
+}
-- 
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