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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
#include "SimpleAnim.h"
#include "../base/Exception.h"
#include "../base/MathHelper.h"
#include "../player/Player.h"
using namespace boost;
using namespace boost::python;
using namespace std;
namespace avg {
SimpleAnim::SimpleAnim(const object& node, const string& sAttrName, long long duration,
const object& startValue, const object& endValue, bool bUseInt,
const object& startCallback, const object& stopCallback)
: AttrAnim(node, sAttrName, startCallback, stopCallback),
m_Duration(duration),
m_StartValue(startValue),
m_EndValue(endValue),
m_bUseInt(bUseInt)
{
}
SimpleAnim::~SimpleAnim()
{
if (Player::exists() && isRunning()) {
setStopped();
}
}
void SimpleAnim::start(bool bKeepAttr)
{
AttrAnim::start();
if (bKeepAttr) {
m_StartTime = calcStartTime();
} else {
m_StartTime = Player::get()->getFrameTime();
}
if (m_Duration == 0) {
setValue(m_EndValue);
remove();
} else {
step();
}
}
void SimpleAnim::abort()
{
if (isRunning()) {
remove();
}
}
template<class T>
object typedLERP(const object& startValue, const object& endValue, float part)
{
T start = extract<T>(startValue);
T end = extract<T>(endValue);
T cur = start+(end-start)*part;
return object(cur);
}
bool SimpleAnim::step()
{
assert(isRunning());
float t = ((float(Player::get()->getFrameTime())-m_StartTime)
/m_Duration);
if (t >= 1.0) {
setValue(m_EndValue);
remove();
return true;
} else {
object curValue;
float part = interpolate(t);
if (isPythonType<float>(m_StartValue)) {
curValue = typedLERP<float>(m_StartValue, m_EndValue, part);
if (m_bUseInt) {
float d = extract<float>(curValue);
curValue = object(round(d));
}
} else if (isPythonType<glm::vec2>(m_StartValue)) {
curValue = typedLERP<glm::vec2>(m_StartValue, m_EndValue, part);
if (m_bUseInt) {
glm::vec2 pt = extract<glm::vec2>(curValue);
curValue = object(glm::vec2(round(pt.x), round(pt.y)));
}
} else {
throw (Exception(AVG_ERR_TYPE,
"Animated attributes must be either numbers or Point2D."));
}
setValue(curValue);
return false;
}
}
long long SimpleAnim::getStartTime() const
{
return m_StartTime;
}
long long SimpleAnim::getDuration() const
{
return m_Duration;
}
long long SimpleAnim::calcStartTime()
{
float part;
if (isPythonType<float>(m_StartValue)) {
if (m_EndValue == m_StartValue) {
part = 0;
} else {
part = getStartPart(extract<float>(m_StartValue),
extract<float>(m_EndValue), extract<float>(getValue()));
}
} else if (isPythonType<glm::vec2>(m_StartValue)) {
float start = glm::vec2(extract<glm::vec2>(m_StartValue)()).x;
float end = glm::vec2(extract<glm::vec2>(m_EndValue)()).x;
float cur = glm::vec2(extract<glm::vec2>(getValue())()).x;
if (start == end) {
start = glm::vec2(extract<glm::vec2>(m_StartValue)()).y;
end = glm::vec2(extract<glm::vec2>(m_EndValue)()).y;
cur = glm::vec2(extract<glm::vec2>(getValue())()).y;
}
if (start == end) {
part = 0;
} else {
part = getStartPart(start, end, cur);
}
} else {
throw (Exception(AVG_ERR_TYPE,
"Animated attributes must be either numbers or Point2D."));
}
return Player::get()->getFrameTime()-(long long)(part*getDuration());
}
float SimpleAnim::getStartPart(float start, float end, float cur)
{
float tstart = 0;
float tend = 1;
bool bDir = (start < end);
for (int i=0; i<10; ++i) {
float tmiddle = (tstart+tend)/2;
float part = interpolate(tmiddle);
float middle = start+(end-start)*part;
if ((bDir && middle < cur) || (!bDir && middle >= cur)) {
tstart = tmiddle;
} else {
tend = tmiddle;
}
}
return (tend+tstart)/2;
}
void SimpleAnim::remove()
{
AnimPtr tempThis = shared_from_this();
removeFromMap();
setStopped();
}
}
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