cc: Support animating scroll offset

cc/animation/scroll_offset_animation_curve_unittest.cc

 // Copyright 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 "cc/animation/scroll_offset_animation_curve.h"
 
 #include "cc/animation/timing_function.h"
 #include "cc/test/geometry_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
+TEST(ScrollOffsetAnimationCurveTest, Duration) {
+  gfx::Vector2dF target_value(100.f, 200.f);
+  scoped_ptr<ScrollOffsetAnimationCurve> curve(
+      ScrollOffsetAnimationCurve::Create(
+          target_value,
+          EaseInOutTimingFunction::Create().Pass()));
+
+  curve->SetInitialValue(target_value);
+  EXPECT_DOUBLE_EQ(0.0, curve->Duration());
+
+  // x decreases, y stays the same.
+  curve->SetInitialValue(gfx::Vector2dF(136.f, 200.f));
+  EXPECT_DOUBLE_EQ(0.1, curve->Duration());
+
+  // x increases, y stays the same.
+  curve->SetInitialValue(gfx::Vector2dF(19.f, 200.f));
+  EXPECT_DOUBLE_EQ(0.15, curve->Duration());
+
+  // x stays the same, y decreases.
+  curve->SetInitialValue(gfx::Vector2dF(100.f, 344.f));
+  EXPECT_DOUBLE_EQ(0.2, curve->Duration());
+
+  // x stays the same, y increases.
+  curve->SetInitialValue(gfx::Vector2dF(100.f, 191.f));
+  EXPECT_DOUBLE_EQ(0.05, curve->Duration());
+
+  // x decreases, y decreases.
+  curve->SetInitialValue(gfx::Vector2dF(32500.f, 500.f));
+  EXPECT_DOUBLE_EQ(3.0, curve->Duration());
+
+  // x decreases, y increases.
+  curve->SetInitialValue(gfx::Vector2dF(150.f, 119.f));
+  EXPECT_DOUBLE_EQ(0.15, curve->Duration());
+
+  // x increases, y decreases.
+  curve->SetInitialValue(gfx::Vector2dF(0.f, 14600.f));
+  EXPECT_DOUBLE_EQ(2.0, curve->Duration());
+
+  // x increases, y increases.
+  curve->SetInitialValue(gfx::Vector2dF(95.f, 191.f));
+  EXPECT_DOUBLE_EQ(0.05, curve->Duration());
+}
+
 TEST(ScrollOffsetAnimationCurveTest, GetValue) {
   gfx::Vector2dF initial_value(2.f, 40.f);
   gfx::Vector2dF target_value(10.f, 20.f);
-  double duration = 10.0;
   scoped_ptr<ScrollOffsetAnimationCurve> curve(
       ScrollOffsetAnimationCurve::Create(
           target_value,
           EaseInOutTimingFunction::Create().Pass()));
-  curve->set_duration(duration);
-  curve->set_initial_value(initial_value);
+  curve->SetInitialValue(initial_value);
+
+  double duration = curve->Duration();
+  EXPECT_GT(curve->Duration(), 0);
+  EXPECT_LT(curve->Duration(), 0.1);
 
   EXPECT_EQ(AnimationCurve::ScrollOffset, curve->Type());
   EXPECT_EQ(duration, curve->Duration());
 
   EXPECT_VECTOR2DF_EQ(initial_value, curve->GetValue(-1.0));
   EXPECT_VECTOR2DF_EQ(initial_value, curve->GetValue(0.0));
   EXPECT_VECTOR2DF_EQ(gfx::Vector2dF(6.f, 30.f), curve->GetValue(duration/2.0));
   EXPECT_VECTOR2DF_EQ(target_value, curve->GetValue(duration));
   EXPECT_VECTOR2DF_EQ(target_value, curve->GetValue(duration+1.0));
 
   // Verify that GetValue takes the timing function into account.
   gfx::Vector2dF value = curve->GetValue(duration/4.0);
   EXPECT_NEAR(3.0333f, value.x(), 0.00015f);
   EXPECT_NEAR(37.4168f, value.y(), 0.00015f);
 }
 
 // Verify that a clone behaves exactly like the original.
 TEST(ScrollOffsetAnimationCurveTest, Clone) {
   gfx::Vector2dF initial_value(2.f, 40.f);
   gfx::Vector2dF target_value(10.f, 20.f);
-  double duration = 10.0;
   scoped_ptr<ScrollOffsetAnimationCurve> curve(
       ScrollOffsetAnimationCurve::Create(
           target_value,
           EaseInOutTimingFunction::Create().Pass()));
-  curve->set_duration(duration);
-  curve->set_initial_value(initial_value);
+  curve->SetInitialValue(initial_value);
+  double duration = curve->Duration();
 
   scoped_ptr<AnimationCurve> clone(curve->Clone().Pass());
 
   EXPECT_EQ(AnimationCurve::ScrollOffset, clone->Type());
   EXPECT_EQ(duration, clone->Duration());
 
   EXPECT_VECTOR2DF_EQ(initial_value,
                       clone->ToScrollOffsetAnimationCurve()->GetValue(-1.0));
   EXPECT_VECTOR2DF_EQ(initial_value,
                       clone->ToScrollOffsetAnimationCurve()->GetValue(0.0));
   EXPECT_VECTOR2DF_EQ(
       gfx::Vector2dF(6.f, 30.f),
       clone->ToScrollOffsetAnimationCurve()->GetValue(duration / 2.0));
   EXPECT_VECTOR2DF_EQ(
       target_value,
       clone->ToScrollOffsetAnimationCurve()->GetValue(duration));
   EXPECT_VECTOR2DF_EQ(
       target_value,
       clone->ToScrollOffsetAnimationCurve()->GetValue(duration + 1.0));
 
   // Verify that the timing function was cloned correctly.
   gfx::Vector2dF value =
       clone->ToScrollOffsetAnimationCurve()->GetValue(duration / 4.0);
   EXPECT_NEAR(3.0333f, value.x(), 0.00015f);
   EXPECT_NEAR(37.4168f, value.y(), 0.00015f);
 }
 
-
 }  // namespace
 }  // namespace cc