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/*
* Copyright 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "interpolator.h"
#include <math.h>
#include "interpolator.h"
namespace ndk_helper
{
//-------------------------------------------------
//Ctor
//-------------------------------------------------
Interpolator::Interpolator()
{
list_params_.clear();
}
//-------------------------------------------------
//Dtor
//-------------------------------------------------
Interpolator::~Interpolator()
{
list_params_.clear();
}
void Interpolator::Clear()
{
list_params_.clear();
}
Interpolator& Interpolator::Set( const float start,
const float dest,
const INTERPOLATOR_TYPE type,
const double duration )
{
//init the parameters for the interpolation process
start_time_ = PerfMonitor::GetCurrentTime();
dest_time_ = start_time_ + duration;
type_ = type;
start_value_ = start;
dest_value_ = dest;
return *this;
}
Interpolator& Interpolator::Add( const float dest,
const INTERPOLATOR_TYPE type,
const double duration )
{
InterpolatorParams param;
param.dest_value_ = dest;
param.type_ = type;
param.duration_ = duration;
list_params_.push_back( param );
return *this;
}
bool Interpolator::Update( const double current_time, float& p )
{
bool bContinue;
if( current_time >= dest_time_ )
{
p = dest_value_;
if( list_params_.size() )
{
InterpolatorParams& item = list_params_.front();
Set( dest_value_, item.dest_value_, item.type_, item.duration_ );
list_params_.pop_front();
bContinue = true;
}
else
{
bContinue = false;
}
}
else
{
float t = (float) (current_time - start_time_);
float d = (float) (dest_time_ - start_time_);
float b = start_value_;
float c = dest_value_ - start_value_;
p = GetFormula( type_, t, b, d, c );
bContinue = true;
}
return bContinue;
}
float Interpolator::GetFormula( const INTERPOLATOR_TYPE type,
const float t,
const float b,
const float d,
const float c )
{
float t1;
switch( type )
{
case INTERPOLATOR_TYPE_LINEAR:
// simple linear interpolation - no easing
return (c * t / d + b);
case INTERPOLATOR_TYPE_EASEINQUAD:
// quadratic (t^2) easing in - accelerating from zero velocity
t1 = t / d;
return (c * t1 * t1 + b);
case INTERPOLATOR_TYPE_EASEOUTQUAD:
// quadratic (t^2) easing out - decelerating to zero velocity
t1 = t / d;
return (-c * t1 * (t1 - 2) + b);
case INTERPOLATOR_TYPE_EASEINOUTQUAD:
// quadratic easing in/out - acceleration until halfway, then deceleration
t1 = t / d / 2;
if( t1 < 1 )
return (c / 2 * t1 * t1 + b);
else
{
t1 = t1 - 1;
return (-c / 2 * (t1 * (t1 - 2) - 1) + b);
}
case INTERPOLATOR_TYPE_EASEINCUBIC:
// cubic easing in - accelerating from zero velocity
t1 = t / d;
return (c * t1 * t1 * t1 + b);
case INTERPOLATOR_TYPE_EASEOUTCUBIC:
// cubic easing in - accelerating from zero velocity
t1 = t / d - 1;
return (c * (t1 * t1 * t1 + 1) + b);
case INTERPOLATOR_TYPE_EASEINOUTCUBIC:
// cubic easing in - accelerating from zero velocity
t1 = t / d / 2;
if( t1 < 1 )
return (c / 2 * t1 * t1 * t1 + b);
else
{
t1 -= 2;
return (c / 2 * (t1 * t1 * t1 + 2) + b);
}
case INTERPOLATOR_TYPE_EASEINQUART:
// quartic easing in - accelerating from zero velocity
t1 = t / d;
return (c * t1 * t1 * t1 * t1 + b);
case INTERPOLATOR_TYPE_EASEINEXPO:
// exponential (2^t) easing in - accelerating from zero velocity
if( t == 0 )
return b;
else
return (c * powf( 2, (10 * (t / d - 1)) ) + b);
case INTERPOLATOR_TYPE_EASEOUTEXPO:
// exponential (2^t) easing out - decelerating to zero velocity
if( t == d )
return (b + c);
else
return (c * (-powf( 2, -10 * t / d ) + 1) + b);
default:
return 0;
}
}
} //namespace ndkHelper
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