// 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. #ifndef UI_GFX_ANIMATION_TWEEN_H_ #define UI_GFX_ANIMATION_TWEEN_H_ #include "base/basictypes.h" #include "third_party/skia/include/core/SkColor.h" #include "ui/gfx/gfx_export.h" #include "ui/gfx/rect.h" #include "ui/gfx/transform.h" namespace gfx { class GFX_EXPORT Tween { public: enum Type { LINEAR, // Linear. EASE_OUT, // Fast in, slow out (default). EASE_IN, // Slow in, fast out. EASE_IN_2, // Variant of EASE_IN that starts out slower than // EASE_IN. EASE_IN_OUT, // Slow in and out, fast in the middle. FAST_IN_OUT, // Fast in and out, slow in the middle. EASE_OUT_SNAP, // Fast in, slow out, snap to final value. SMOOTH_IN_OUT, // Smooth, consistent speeds in and out (sine wave). FAST_OUT_SLOW_IN, // Variant of EASE_IN_OUT which should be used in most // cases. LINEAR_OUT_SLOW_IN, // Variant of EASE_OUT which should be used for // fading in from 0% or motion when entering a scene. FAST_OUT_LINEAR_IN, // Variant of EASE_IN which should should be used for // fading out to 0% or motion when exiting a scene. ZERO, // Returns a value of 0 always. }; // Returns the value based on the tween type. |state| is from 0-1. static double CalculateValue(Type type, double state); // Conveniences for getting a value between a start and end point. static SkColor ColorValueBetween(double value, SkColor start, SkColor target); static double DoubleValueBetween(double value, double start, double target); static float FloatValueBetween(double value, float start, float target); // Interpolated between start and target, with every integer in this range // given equal weight. static int IntValueBetween(double value, int start, int target); // Interpolates between start and target as real numbers, and rounds the // result to the nearest integer, with ties broken by rounding towards // positive infinity. This gives start and target half the weight of the // other integers in the range. This is the integer interpolation approach // specified by www.w3.org/TR/css3-transitions. static int LinearIntValueBetween(double value, int start, int target); static gfx::Rect RectValueBetween(double value, const gfx::Rect& start_bounds, const gfx::Rect& target_bounds); static gfx::Transform TransformValueBetween( double value, const gfx::Transform& start_transform, const gfx::Transform& target_transform); private: Tween(); ~Tween(); DISALLOW_COPY_AND_ASSIGN(Tween); }; } // namespace gfx #endif // UI_GFX_ANIMATION_TWEEN_H_