afxEase.cpp

Detailed Description

  1
  2
  3//~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~~//
  4// Arcane-FX for MIT Licensed Open Source version of Torque 3D from GarageGames
  5// Copyright (C) 2015 Faust Logic, Inc.
  6//
  7// Permission is hereby granted, free of charge, to any person obtaining a copy
  8// of this software and associated documentation files (the "Software"), to
  9// deal in the Software without restriction, including without limitation the
 10// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 11// sell copies of the Software, and to permit persons to whom the Software is
 12// furnished to do so, subject to the following conditions:
 13//
 14// The above copyright notice and this permission notice shall be included in
 15// all copies or substantial portions of the Software.
 16//
 17// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 18// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 19// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 20// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 21// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 22// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 23// IN THE SOFTWARE.
 24//
 25//~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~~//
 26
 27#include "afx/arcaneFX.h"
 28#include "afxEase.h"
 29
 30//~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~~//
 31
 32F32
 33afxEase::t(F32 t, F32 ein, F32 eout)
 34{
 35  if (t == 0.0)
 36    return 0.0;
 37  
 38  if (t == 1.0)
 39    return 1.0;
 40  
 41  F32 ee = eout - ein + 1.0;
 42  
 43  // ease in section
 44  if (t <= ein)
 45  {
 46    F32 tin = t/ein;
 47    return (mSin(M_PI_F*(tin - 1.0)) + M_PI_F*tin)*ein*(1.0/<a href="/coding/file/mconstants_8h/#mconstants_8h_1ab9c3c609e1d02430671de0a109410ac8">M_PI_F</a>)/ee;
 48  }
 49
 50  // middle linear section
 51  else if (t <= eout)
 52  {
 53    return (2.0*t - ein)/ee;
 54  }
 55
 56  // ease out section
 57  else 
 58  {
 59    F32 iout = 1.0 - eout;
 60    F32 g   = (t - eout)*M_PI_F/iout;
 61    return ((mSin(g) + g)*(iout)/<a href="/coding/file/mconstants_8h/#mconstants_8h_1ab9c3c609e1d02430671de0a109410ac8">M_PI_F</a> + 2.0*eout - ein)*1.0/ee + 0.0;
 62  }
 63}
 64
 65F32
 66afxEase::eq(F32 t, F32 a, F32 b, F32 ein, F32 eout)
 67{
 68  if (t == 0.0)
 69    return a;
 70  
 71  if (t == 1.0)
 72    return b;
 73  
 74  F32 ab = b - a;
 75  F32 ee = eout - ein + 1.0;
 76  
 77  // ease in section
 78  if (t <= ein)
 79  {
 80    F32 tin = t/ein;
 81    return a + (mSin(M_PI_F*(tin - 1.0)) + M_PI_F*tin)*ab*ein*(1.0/<a href="/coding/file/mconstants_8h/#mconstants_8h_1ab9c3c609e1d02430671de0a109410ac8">M_PI_F</a>)/ee;
 82  }
 83
 84  // middle linear section
 85  else if (t <= eout)
 86  {
 87    return a + ab*(2.0*t - ein)/ee;
 88  }
 89
 90  // ease out section
 91  else 
 92  {
 93    F32 iout = 1.0 - eout;
 94    F32 g   = (t - eout)*M_PI_F/iout;
 95    return ((mSin(g) + g)*(iout)/<a href="/coding/file/mconstants_8h/#mconstants_8h_1ab9c3c609e1d02430671de0a109410ac8">M_PI_F</a> + 2.0*eout - ein)*ab/ee + a;
 96  }
 97}
 98
 99//~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~~//
100