diff --git a/test/test_all.scad b/test/test_all.scad
index e0d75502..d184d299 100644
--- a/test/test_all.scad
+++ b/test/test_all.scad
@@ -68,4 +68,5 @@ include <test_path_extrude.scad>;
 
 // Pixel
 include <test_px_line.scad>;
-include <test_px_polyline.scad>;
\ No newline at end of file
+include <test_px_polyline.scad>;
+include <test_px_circle.scad>;
\ No newline at end of file
diff --git a/test/test_px_circle.scad b/test/test_px_circle.scad
new file mode 100644
index 00000000..045090ae
--- /dev/null
+++ b/test/test_px_circle.scad
@@ -0,0 +1,13 @@
+
+module test_px_circle() {
+    echo("==== test_px_circle ====");
+
+    include <unittest.scad>;
+    include <px_circle.scad>;
+    expected = [[-0.5, 9.5], [-0.5, -10.5], [-10.5, -0.5], [-9.5, -0.5], [-8.5, -0.5], [-7.5, -0.5], [-6.5, -0.5], [-5.5, -0.5], [-4.5, -0.5], [-3.5, -0.5], [-2.5, -0.5], [-1.5, -0.5], [-0.5, -0.5], [0.5, -0.5], [1.5, -0.5], [2.5, -0.5], [3.5, -0.5], [4.5, -0.5], [5.5, -0.5], [6.5, -0.5], [7.5, -0.5], [8.5, -0.5], [9.5, -0.5], [0.5, 9.5], [-0.5, 9.5], [-1.5, 9.5], [9.5, 0.5], [8.5, 0.5], [7.5, 0.5], [6.5, 0.5], [5.5, 0.5], [4.5, 0.5], [3.5, 0.5], [2.5, 0.5], [1.5, 0.5], [0.5, 0.5], [-0.5, 0.5], [-1.5, 0.5], [-2.5, 0.5], [-3.5, 0.5], [-4.5, 0.5], [-5.5, 0.5], [-6.5, 0.5], [-7.5, 0.5], [-8.5, 0.5], [-9.5, 0.5], [-10.5, 0.5], [9.5, -1.5], [8.5, -1.5], [7.5, -1.5], [6.5, -1.5], [5.5, -1.5], [4.5, -1.5], [3.5, -1.5], [2.5, -1.5], [1.5, -1.5], [0.5, -1.5], [-0.5, -1.5], [-1.5, -1.5], [-2.5, -1.5], [-3.5, -1.5], [-4.5, -1.5], [-5.5, -1.5], [-6.5, -1.5], [-7.5, -1.5], [-8.5, -1.5], [-9.5, -1.5], [-10.5, -1.5], [0.5, -10.5], [-0.5, -10.5], [-1.5, -10.5], [1.5, 9.5], [0.5, 9.5], [-0.5, 9.5], [-1.5, 9.5], [-2.5, 9.5], [9.5, 1.5], [8.5, 1.5], [7.5, 1.5], [6.5, 1.5], [5.5, 1.5], [4.5, 1.5], [3.5, 1.5], [2.5, 1.5], [1.5, 1.5], [0.5, 1.5], [-0.5, 1.5], [-1.5, 1.5], [-2.5, 1.5], [-3.5, 1.5], [-4.5, 1.5], [-5.5, 1.5], [-6.5, 1.5], [-7.5, 1.5], [-8.5, 1.5], [-9.5, 1.5], [-10.5, 1.5], [9.5, -2.5], [8.5, -2.5], [7.5, -2.5], [6.5, -2.5], [5.5, -2.5], [4.5, -2.5], [3.5, -2.5], [2.5, -2.5], [1.5, -2.5], [0.5, -2.5], [-0.5, -2.5], [-1.5, -2.5], [-2.5, -2.5], [-3.5, -2.5], [-4.5, -2.5], [-5.5, -2.5], [-6.5, -2.5], [-7.5, -2.5], [-8.5, -2.5], [-9.5, -2.5], [-10.5, -2.5], [1.5, -10.5], [0.5, -10.5], [-0.5, -10.5], [-1.5, -10.5], [-2.5, -10.5], [2.5, 9.5], [1.5, 9.5], [0.5, 9.5], [-0.5, 9.5], [-1.5, 9.5], [-2.5, 9.5], [-3.5, 9.5], [9.5, 2.5], [8.5, 2.5], [7.5, 2.5], [6.5, 2.5], [5.5, 2.5], [4.5, 2.5], [3.5, 2.5], [2.5, 2.5], [1.5, 2.5], [0.5, 2.5], [-0.5, 2.5], [-1.5, 2.5], [-2.5, 2.5], [-3.5, 2.5], [-4.5, 2.5], [-5.5, 2.5], [-6.5, 2.5], [-7.5, 2.5], [-8.5, 2.5], [-9.5, 2.5], [-10.5, 2.5], [9.5, -3.5], [8.5, -3.5], [7.5, -3.5], [6.5, -3.5], [5.5, -3.5], [4.5, -3.5], [3.5, -3.5], [2.5, -3.5], [1.5, -3.5], [0.5, -3.5], [-0.5, -3.5], [-1.5, -3.5], [-2.5, -3.5], [-3.5, -3.5], [-4.5, -3.5], [-5.5, -3.5], [-6.5, -3.5], [-7.5, -3.5], [-8.5, -3.5], [-9.5, -3.5], [-10.5, -3.5], [2.5, -10.5], [1.5, -10.5], [0.5, -10.5], [-0.5, -10.5], [-1.5, -10.5], [-2.5, -10.5], [-3.5, -10.5], [3.5, 8.5], [2.5, 8.5], [1.5, 8.5], [0.5, 8.5], [-0.5, 8.5], [-1.5, 8.5], [-2.5, 8.5], [-3.5, 8.5], [-4.5, 8.5], [8.5, 3.5], [7.5, 3.5], [6.5, 3.5], [5.5, 3.5], [4.5, 3.5], [3.5, 3.5], [2.5, 3.5], [1.5, 3.5], [0.5, 3.5], [-0.5, 3.5], [-1.5, 3.5], [-2.5, 3.5], [-3.5, 3.5], [-4.5, 3.5], [-5.5, 3.5], [-6.5, 3.5], [-7.5, 3.5], [-8.5, 3.5], [-9.5, 3.5], [8.5, -4.5], [7.5, -4.5], [6.5, -4.5], [5.5, -4.5], [4.5, -4.5], [3.5, -4.5], [2.5, -4.5], [1.5, -4.5], [0.5, -4.5], [-0.5, -4.5], [-1.5, -4.5], [-2.5, -4.5], [-3.5, -4.5], [-4.5, -4.5], [-5.5, -4.5], [-6.5, -4.5], [-7.5, -4.5], [-8.5, -4.5], [-9.5, -4.5], [3.5, -9.5], [2.5, -9.5], [1.5, -9.5], [0.5, -9.5], [-0.5, -9.5], [-1.5, -9.5], [-2.5, -9.5], [-3.5, -9.5], [-4.5, -9.5], [4.5, 8.5], [3.5, 8.5], [2.5, 8.5], [1.5, 8.5], [0.5, 8.5], [-0.5, 8.5], [-1.5, 8.5], [-2.5, 8.5], [-3.5, 8.5], [-4.5, 8.5], [-5.5, 8.5], [8.5, 4.5], [7.5, 4.5], [6.5, 4.5], [5.5, 4.5], [4.5, 4.5], [3.5, 4.5], [2.5, 4.5], [1.5, 4.5], [0.5, 4.5], [-0.5, 4.5], [-1.5, 4.5], [-2.5, 4.5], [-3.5, 4.5], [-4.5, 4.5], [-5.5, 4.5], [-6.5, 4.5], [-7.5, 4.5], [-8.5, 4.5], [-9.5, 4.5], [8.5, -5.5], [7.5, -5.5], [6.5, -5.5], [5.5, -5.5], [4.5, -5.5], [3.5, -5.5], [2.5, -5.5], [1.5, -5.5], [0.5, -5.5], [-0.5, -5.5], [-1.5, -5.5], [-2.5, -5.5], [-3.5, -5.5], [-4.5, -5.5], [-5.5, -5.5], [-6.5, -5.5], [-7.5, -5.5], [-8.5, -5.5], [-9.5, -5.5], [4.5, -9.5], [3.5, -9.5], [2.5, -9.5], [1.5, -9.5], [0.5, -9.5], [-0.5, -9.5], [-1.5, -9.5], [-2.5, -9.5], [-3.5, -9.5], [-4.5, -9.5], [-5.5, -9.5], [5.5, 7.5], [4.5, 7.5], [3.5, 7.5], [2.5, 7.5], [1.5, 7.5], [0.5, 7.5], [-0.5, 7.5], [-1.5, 7.5], [-2.5, 7.5], [-3.5, 7.5], [-4.5, 7.5], [-5.5, 7.5], [-6.5, 7.5], [7.5, 5.5], [6.5, 5.5], [5.5, 5.5], [4.5, 5.5], [3.5, 5.5], [2.5, 5.5], [1.5, 5.5], [0.5, 5.5], [-0.5, 5.5], [-1.5, 5.5], [-2.5, 5.5], [-3.5, 5.5], [-4.5, 5.5], [-5.5, 5.5], [-6.5, 5.5], [-7.5, 5.5], [-8.5, 5.5], [7.5, -6.5], [6.5, -6.5], [5.5, -6.5], [4.5, -6.5], [3.5, -6.5], [2.5, -6.5], [1.5, -6.5], [0.5, -6.5], [-0.5, -6.5], [-1.5, -6.5], [-2.5, -6.5], [-3.5, -6.5], [-4.5, -6.5], [-5.5, -6.5], [-6.5, -6.5], [-7.5, -6.5], [-8.5, -6.5], [5.5, -8.5], [4.5, -8.5], [3.5, -8.5], [2.5, -8.5], [1.5, -8.5], [0.5, -8.5], [-0.5, -8.5], [-1.5, -8.5], [-2.5, -8.5], [-3.5, -8.5], [-4.5, -8.5], [-5.5, -8.5], [-6.5, -8.5], [6.5, 6.5], [5.5, 6.5], [4.5, 6.5], [3.5, 6.5], [2.5, 6.5], [1.5, 6.5], [0.5, 6.5], [-0.5, 6.5], [-1.5, 6.5], [-2.5, 6.5], [-3.5, 6.5], [-4.5, 6.5], [-5.5, 6.5], [-6.5, 6.5], [-7.5, 6.5], [6.5, 6.5], [5.5, 6.5], [4.5, 6.5], [3.5, 6.5], [2.5, 6.5], [1.5, 6.5], [0.5, 6.5], [-0.5, 6.5], [-1.5, 6.5], [-2.5, 6.5], [-3.5, 6.5], [-4.5, 6.5], [-5.5, 6.5], [-6.5, 6.5], [-7.5, 6.5], [6.5, -7.5], [5.5, -7.5], [4.5, -7.5], [3.5, -7.5], [2.5, -7.5], [1.5, -7.5], [0.5, -7.5], [-0.5, -7.5], [-1.5, -7.5], [-2.5, -7.5], [-3.5, -7.5], [-4.5, -7.5], [-5.5, -7.5], [-6.5, -7.5], [-7.5, -7.5], [6.5, -7.5], [5.5, -7.5], [4.5, -7.5], [3.5, -7.5], [2.5, -7.5], [1.5, -7.5], [0.5, -7.5], [-0.5, -7.5], [-1.5, -7.5], [-2.5, -7.5], [-3.5, -7.5], [-4.5, -7.5], [-5.5, -7.5], [-6.5, -7.5], [-7.5, -7.5]];
+    actual = px_circle([-0.5, -0.5], 10, true);
+
+    assertEqualPoints(expected, actual);
+}
+
+test_px_circle();
\ No newline at end of file