From 73d77ef38bd8c715ea4f4afcee507e81a8873620 Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Fri, 9 Oct 2015 22:00:41 -0400
Subject: [PATCH] =?UTF-8?q?Capped=20sweeps=20at=202=CF=80=20radians.?=
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---
 darwin/draw.m      | 2 ++
 unix/draw.c        | 4 ++++
 unix/uipriv_unix.h | 3 +++
 windows/draw.c     | 2 ++
 4 files changed, 11 insertions(+)

diff --git a/darwin/draw.m b/darwin/draw.m
index 178dbca7..f0288303 100644
--- a/darwin/draw.m
+++ b/darwin/draw.m
@@ -56,6 +56,8 @@ void uiDrawPathArcTo(uiDrawPath *p, double xCenter, double yCenter, double radiu
 {
 	if (p->ended)
 		complain("attempt to add arc to ended path in uiDrawPathArcTo()");
+	if (sweep > 2 * M_PI)
+		sweep = 2 * M_PI;
 	// TODO wasn't there a relative function?
 	CGPathAddArc(p->path, NULL,
 		xCenter, yCenter,
diff --git a/unix/draw.c b/unix/draw.c
index 5a0cc84d..5cd40ab4 100644
--- a/unix/draw.c
+++ b/unix/draw.c
@@ -59,6 +59,8 @@ void uiDrawPathNewFigureWithArc(uiDrawPath *p, double xCenter, double yCenter, d
 {
 	struct piece piece;
 
+	if (sweep > 2 * M_PI)
+		sweep = 2 * M_PI;
 	piece.type = newFigureArc;
 	piece.d[0] = xCenter;
 	piece.d[1] = yCenter;
@@ -82,6 +84,8 @@ void uiDrawPathArcTo(uiDrawPath *p, double xCenter, double yCenter, double radiu
 {
 	struct piece piece;
 
+	if (sweep > 2 * M_PI)
+		sweep = 2 * M_PI;
 	piece.type = arcTo;
 	piece.d[0] = xCenter;
 	piece.d[1] = yCenter;
diff --git a/unix/uipriv_unix.h b/unix/uipriv_unix.h
index fa85799d..72b73e8a 100644
--- a/unix/uipriv_unix.h
+++ b/unix/uipriv_unix.h
@@ -3,6 +3,9 @@
 #define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_32
 #define GDK_VERSION_MIN_REQUIRED GDK_VERSION_3_4
 #define GDK_VERSION_MAX_ALLOWED GDK_VERSION_3_4
+// TODO make this unnecessary
+#define _GNU_SOURCE
+#include <math.h>
 #include <gtk/gtk.h>
 #include "../ui.h"
 #include "../ui_unix.h"
diff --git a/windows/draw.c b/windows/draw.c
index 9c2f7569..0425ae33 100644
--- a/windows/draw.c
+++ b/windows/draw.c
@@ -148,6 +148,8 @@ static void doDrawArc(ID2D1GeometrySink *sink, double startX, double startY, dou
 {
 	D2D1_ARC_SEGMENT as;
 
+	if (sweep > 2 * M_PI)
+		sweep = 2 * M_PI;
 	as.point.x = endX;
 	as.point.y = endY;
 	as.size.width = radius;