Move animation code to new ui/base/animation directory....

app/tween.cc

-// Copyright (c) 2010 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 "app/tween.h"
-
-#include <math.h>
-
-#if defined(OS_WIN)
-#include <float.h>
-#endif
-
-#include "base/logging.h"
-#include "gfx/rect.h"
-
-// static
-double Tween::CalculateValue(Tween::Type type, double state) {
-  DCHECK_GE(state, 0);
-  DCHECK_LE(state, 1);
-
-  switch (type) {
-    case EASE_IN:
-      return pow(state, 2);
-
-    case EASE_IN_OUT:
-      if (state < 0.5)
-        return pow(state * 2, 2) / 2.0;
-      return 1.0 - (pow((state - 1.0) * 2, 2) / 2.0);
-
-    case FAST_IN_OUT:
-      return (pow(state - 0.5, 3) + 0.125) / 0.25;
-
-    case LINEAR:
-      return state;
-
-    case EASE_OUT_SNAP:
-      state = 0.95 * (1.0 - pow(1.0 - state, 2));
-      break;
-
-    case EASE_OUT:
-      return 1.0 - pow(1.0 - state, 2);
-
-    case ZERO:
-      return 0;
-  }
-
-  NOTREACHED();
-  return state;
-}
-
-// static
-double Tween::ValueBetween(double value, double start, double target) {
-  return start + (target - start) * value;
-}
-
-// static
-int Tween::ValueBetween(double value, int start, int target) {
-  if (start == target)
-    return start;
-  double delta = static_cast<double>(target - start);
-  if (delta < 0)
-    delta--;
-  else
-    delta++;
-#if defined(OS_WIN)
-  return start + static_cast<int>(value * _nextafter(delta, 0));
-#else
-  return start + static_cast<int>(value * nextafter(delta, 0));
-#endif
-}
-
-// static
-gfx::Rect Tween::ValueBetween(double value,
-                              const gfx::Rect& start_bounds,
-                              const gfx::Rect& target_bounds) {
-  return gfx::Rect(ValueBetween(value, start_bounds.x(), target_bounds.x()),
-                   ValueBetween(value, start_bounds.y(), target_bounds.y()),
-                   ValueBetween(value, start_bounds.width(),
-                                target_bounds.width()),
-                   ValueBetween(value, start_bounds.height(),
-                                target_bounds.height()));
-}