1 files changed, 19 insertions, 0 deletions
diff --git a/src/cmd/map/libmap/azequalarea.c b/src/cmd/map/libmap/azequalarea.c
new file mode 100644
index 00000000..6bae893d
--- /dev/null
+++ b/src/cmd/map/libmap/azequalarea.c
@@ -0,0 +1,19 @@
+#include <u.h>
+#include <libc.h>
+#include "map.h"
+
+int
+Xazequalarea(struct place *place, double *x, double *y)
+{
+	double r;
+	r = sqrt(1. - place->nlat.s);
+	*x = - r * place->wlon.s;
+	*y = - r * place->wlon.c;
+	return(1);
+}
+
+proj
+azequalarea(void)
+{
+	return(Xazequalarea);
+}