1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef UI_GFX_ANIMATION_TWEEN_H_
6 #define UI_GFX_ANIMATION_TWEEN_H_
8 #include "base/basictypes.h"
9 #include "third_party/skia/include/core/SkColor.h"
10 #include "ui/gfx/gfx_export.h"
11 #include "ui/gfx/rect.h"
12 #include "ui/gfx/transform.h"
16 class GFX_EXPORT Tween {
20 EASE_OUT, // Fast in, slow out (default).
21 EASE_OUT_2, // Variant of EASE_OUT that ends slower than EASE_OUT.
22 // Should be used for fading in or entering a scene.
23 EASE_IN, // Slow in, fast out.
24 EASE_IN_2, // Variant of EASE_IN that starts out slower than EASE_IN.
25 EASE_IN_3, // Variant of EASE_IN that starts out faster than EASE_IN.
26 // Should be used for fading out or exiting a scene.
27 EASE_IN_OUT, // Slow in and out, fast in the middle.
28 EASE_IN_OUT_2, // Variant of EASE_IN_OUT which starts out faster than
29 // EASE_IN_OUT but ends slower than EASE_IN_OUT.
30 FAST_IN_OUT, // Fast in and out, slow in the middle.
31 EASE_OUT_SNAP, // Fast in, slow out, snap to final value.
32 SMOOTH_IN_OUT, // Smooth, consistent speeds in and out (sine wave).
33 ZERO, // Returns a value of 0 always.
36 // Returns the value based on the tween type. |state| is from 0-1.
37 static double CalculateValue(Type type, double state);
39 // Conveniences for getting a value between a start and end point.
40 static SkColor ColorValueBetween(double value, SkColor start, SkColor target);
41 static double DoubleValueBetween(double value, double start, double target);
42 static float FloatValueBetween(double value, float start, float target);
44 // Interpolated between start and target, with every integer in this range
45 // given equal weight.
46 static int IntValueBetween(double value, int start, int target);
48 // Interpolates between start and target as real numbers, and rounds the
49 // result to the nearest integer, with ties broken by rounding towards
50 // positive infinity. This gives start and target half the weight of the
51 // other integers in the range. This is the integer interpolation approach
52 // specified by www.w3.org/TR/css3-transitions.
53 static int LinearIntValueBetween(double value, int start, int target);
54 static gfx::Rect RectValueBetween(double value,
55 const gfx::Rect& start_bounds,
56 const gfx::Rect& target_bounds);
57 static gfx::Transform TransformValueBetween(
59 const gfx::Transform& start_transform,
60 const gfx::Transform& target_transform);
66 DISALLOW_COPY_AND_ASSIGN(Tween);
71 #endif // UI_GFX_ANIMATION_TWEEN_H_