1 /* 2 Copyright 2010 Google Inc. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 18 #ifndef SkFlingState_DEFINED 19 #define SkFlingState_DEFINED 20 21 #include "SkScalar.h" 22 #include "SkPoint.h" 23 24 class SkMatrix; 25 26 struct FlingState { 27 FlingState() : fActive(false) {} 28 29 bool isActive() const { return fActive; } 30 void stop() { fActive = false; } 31 32 void reset(float sx, float sy); 33 bool evaluateMatrix(SkMatrix* matrix); 34 35 private: 36 SkPoint fDirection; 37 SkScalar fSpeed0; 38 double fTime0; 39 bool fActive; 40 }; 41 42 class GrAnimateFloat { 43 public: 44 GrAnimateFloat(); 45 46 void start(float v0, float v1, float duration); 47 bool isActive() const { return fTime0 != 0; } 48 void stop() { fTime0 = 0; } 49 50 float evaluate(); 51 52 private: 53 float fValue0, fValue1, fDuration; 54 SkMSec fTime0; 55 }; 56 57 #endif 58 59
