1 files changed, 24 insertions, 0 deletions
diff --git a/src/cmd/map/libmap/cylequalarea.c b/src/cmd/map/libmap/cylequalarea.c
new file mode 100644
index 00000000..3cf222ff
--- /dev/null
+++ b/src/cmd/map/libmap/cylequalarea.c
@@ -0,0 +1,24 @@
+#include <u.h>
+#include <libc.h>
+#include "map.h"
+
+static double a;
+
+static int
+Xcylequalarea(struct place *place, double *x, double *y)
+{
+	*x = - place->wlon.l * a;
+	*y = place->nlat.s;
+	return(1);
+}
+
+proj
+cylequalarea(double par)
+{
+	struct coord stdp0;
+	if(par > 89.0)
+		return(0);
+	deg2rad(par, &stdp0);
+	a = stdp0.c*stdp0.c;
+	return(Xcylequalarea);
+}