From c1fe0b4e0c4319926c3322ebf0ea60dd52b9c539 Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Tue, 23 Jun 2020 19:17:00 +1000
Subject: [PATCH] Use hypot function

---
 .../imagedraw_wide_line_larger_than_int.png       | Bin 0 -> 557 bytes
 Tests/test_imagedraw.py                           |  13 +++++++++++++
 src/libImaging/Draw.c                             |   2 +-
 3 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 Tests/images/imagedraw_wide_line_larger_than_int.png

diff --git a/Tests/images/imagedraw_wide_line_larger_than_int.png b/Tests/images/imagedraw_wide_line_larger_than_int.png
new file mode 100644
index 0000000000000000000000000000000000000000..68073ce48276fb22191fbe03612f32955ec9b48d
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diff --git a/Tests/test_imagedraw.py b/Tests/test_imagedraw.py
index 74b0b8ff3..9aac1a0c8 100644
--- a/Tests/test_imagedraw.py
+++ b/Tests/test_imagedraw.py
@@ -887,6 +887,19 @@ def test_wide_line_dot():
     assert_image_similar(im, Image.open(expected), 1)
 
 
+def test_wide_line_larger_than_int():
+    # Arrange
+    im = Image.new("RGB", (W, H))
+    draw = ImageDraw.Draw(im)
+    expected = "Tests/images/imagedraw_wide_line_larger_than_int.png"
+
+    # Act
+    draw.line([(0, 0), (32768, 32768)], width=3)
+
+    # Assert
+    assert_image_similar(im, Image.open(expected), 1)
+
+
 @pytest.mark.parametrize(
     "xy",
     [
diff --git a/src/libImaging/Draw.c b/src/libImaging/Draw.c
index 947d7f70f..08f6c3843 100644
--- a/src/libImaging/Draw.c
+++ b/src/libImaging/Draw.c
@@ -683,7 +683,7 @@ ImagingDrawWideLine(Imaging im, int x0, int y0, int x1, int y1,
         return 0;
     }
 
-    big_hypotenuse = sqrt((double) (dx*dx + dy*dy));
+    big_hypotenuse = hypot(dx, dy);
     small_hypotenuse = (width - 1) / 2.0;
     ratio_max = ROUND_UP(small_hypotenuse) / big_hypotenuse;
     ratio_min = ROUND_DOWN(small_hypotenuse) / big_hypotenuse;