| // 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. |
| |
| #ifndef APP_TWEEN_H_ |
| #define APP_TWEEN_H_ |
| #pragma once |
| |
| #include "base/basictypes.h" |
| |
| namespace gfx { |
| class Rect; |
| } |
| |
| class Tween { |
| public: |
| enum Type { |
| LINEAR, // Linear. |
| EASE_OUT, // Fast in, slow out (default). |
| EASE_IN, // Slow in, fast out. |
| 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. |
| 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 double ValueBetween(double value, double start, double target); |
| static int ValueBetween(double value, int start, int target); |
| static gfx::Rect ValueBetween(double value, |
| const gfx::Rect& start_bounds, |
| const gfx::Rect& target_bounds); |
| |
| private: |
| Tween(); |
| ~Tween(); |
| |
| DISALLOW_COPY_AND_ASSIGN(Tween); |
| }; |
| |
| #endif // APP_TWEEN_H_ |