Centered flood fill style ink drop ripples on mouse/touch points.

ui/gfx/geometry/rect_unittest.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <limits>
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "build/build_config.h"
@@ skipping 897 matching lines @@
   EXPECT_FLOAT_EQ(
       0.0f, f.ManhattanInternalDistance(gfx::RectF(-1.0f, 0.0f, 1.1f, 1.0f)));
   EXPECT_FLOAT_EQ(
       0.1f + kEpsilon,
       f.ManhattanInternalDistance(gfx::RectF(-1.5f, 0.0f, 1.4f, 1.0f)));
   EXPECT_FLOAT_EQ(
       kEpsilon,
       f.ManhattanInternalDistance(gfx::RectF(-1.5f, 0.0f, 1.5f, 1.0f)));
 }
 
+TEST(RectTest, MaxDistanceToCorners) {
+  const float kAbsError = 0.01f;
+  // Rect with the following corners in clockwise order starting at the origin:
+  // (10, 30), (60, 30), (10, 100), (60, 100)
+  const Rect rect(10, 30, 50, 70);
+
+  // Interior points
+  EXPECT_NEAR(78.10f, rect.MaxDistanceToCorners(gfx::Point(10, 40)), kAbsError);
+  EXPECT_NEAR(71.06f, rect.MaxDistanceToCorners(gfx::Point(55, 45)), kAbsError);
+  EXPECT_NEAR(64.03f, rect.MaxDistanceToCorners(gfx::Point(50, 80)), kAbsError);
+  EXPECT_NEAR(68.01f, rect.MaxDistanceToCorners(gfx::Point(20, 85)), kAbsError);
+
+  // Exterior points
+  EXPECT_NEAR(110.79f, rect.MaxDistanceToCorners(gfx::Point(3, 5)), kAbsError);
+  EXPECT_NEAR(108.17f, rect.MaxDistanceToCorners(gfx::Point(70, 10)),
+              kAbsError);
+  EXPECT_NEAR(103.08f, rect.MaxDistanceToCorners(gfx::Point(75, 110)),
+              kAbsError);
+  EXPECT_NEAR(101.24f, rect.MaxDistanceToCorners(gfx::Point(5, 115)),
+              kAbsError);
+}
+
 }  // namespace gfx