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

ui/gfx/geometry/rect.cc

 // Copyright (c) 2012 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 "ui/gfx/geometry/rect.h"
 
 #include <algorithm>
 
 #if defined(OS_WIN)
 #include <windows.h>
@@ skipping 221 matching lines @@
 
   static const int kEpsilon = std::numeric_limits<int>::is_integer
                                   ? 1
                                   : std::numeric_limits<int>::epsilon();
 
   int x = std::max<int>(0, c.width() - width() - rect.width() + kEpsilon);
   int y = std::max<int>(0, c.height() - height() - rect.height() + kEpsilon);
   return x + y;
 }
 
+float Rect::MaxDistanceToCorners(const gfx::Point& point) const {
+  const float distance_to_top_left = (origin() - point).Length();
+  const float distance_to_top_right = (top_right() - point).Length();
+  const float distance_to_bottom_left = (bottom_left() - point).Length();
+  const float distance_to_bottom_right = (bottom_right() - point).Length();
+
+  float largest_distance =
+      std::max(distance_to_top_left, distance_to_top_right);
+  largest_distance = std::max(largest_distance, distance_to_bottom_left);
+  largest_distance = std::max(largest_distance, distance_to_bottom_right);
+  return largest_distance;
+}
+
 std::string Rect::ToString() const {
   return base::StringPrintf("%s %s",
                             origin().ToString().c_str(),
                             size().ToString().c_str());
 }
 
 bool Rect::ApproximatelyEqual(const Rect& rect, int tolerance) const {
   return std::abs(x() - rect.x()) <= tolerance &&
          std::abs(y() - rect.y()) <= tolerance &&
          std::abs(right() - rect.right()) <= tolerance &&
@@ skipping 32 matching lines @@
 
 Rect BoundingRect(const Point& p1, const Point& p2) {
   int rx = std::min(p1.x(), p2.x());
   int ry = std::min(p1.y(), p2.y());
   int rr = std::max(p1.x(), p2.x());
   int rb = std::max(p1.y(), p2.y());
   return Rect(rx, ry, rr - rx, rb - ry);
 }
 
 }  // namespace gfx