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Channel.cpp
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Channel.cpp
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/*
* Keyframe.cpp
* Homework4
*
* Created by John Ryding on 4/21/11.
* Copyright 2011 __MyCompanyName__. All rights reserved.
*
*/
#include "Channel.h"
Channel::Channel() : keyFrameArr(){
this->hasMinKeyFrames = false;
}
/*
* Find the value of the frame at the given time. If the time is equal to a keyframe, that value is returned.
* Otherwise, the value is interpolated.
*/
float Channel::Evaluate(int time){
Keyframe_Time_functor f;
vector<Keyframe>::iterator ubIter = upper_bound(keyFrameArr.begin(), keyFrameArr.end(), time, f);
if (ubIter != keyFrameArr.end()){
Keyframe k1 = *ubIter;
if (time == k1.Time) {
return k1.Value;
}
Keyframe k0 = *(--ubIter);
if (time == k0.Time) {
return k0.Value;
}
float tDelta1 = float(time - k0.Time);
float tDelta2 = float(k1.Time - k0.Time);
float u = tDelta1 / tDelta2;
return k0.D + u*( k0.C + u*( k0.B + u*k0.A) );
} else {
Keyframe k0 = *(--ubIter);
if (time == k0.Time) {
return k0.Value;
}
}
return -1.0;
}
/*
* Add a new keyframe to the channel.
*/
void Channel::insertKeyFrame(Keyframe *frame){
this->keyFrameArr.push_back(*frame);
Keyframe_functor f;
sort(this->keyFrameArr.begin(), this->keyFrameArr.end(), f);
this->Precompute();
}
/*
* Check if a time value is a keyframe or a regular frame
*/
bool Channel::isKeyFrame(int time){
Keyframe_Time_functor f;
return binary_search(keyFrameArr.begin(), keyFrameArr.end(), time, f);
}
/*
* Precompute the tangents and cubic coefficients of the curves between all the keyframes.
*/
void Channel::Precompute(){
if (this->keyFrameArr.size() > 1) {
this->hasMinKeyFrames = true;
} else {
this->hasMinKeyFrames = false;
}
this->computeTangents();
this->computeConstants();
}
/*
* Get the time in which the last frame will occur
*/
int Channel::getMaxTime(){
Keyframe frame = *(--this->keyFrameArr.end());
return frame.Time;
}
/*
* Remove a keyframe from the channel
*/
void Channel::removeKeyframe(int time){
time_equals_keyframe f = { time };
vector<Keyframe>::iterator objIter = find_if(keyFrameArr.begin(), keyFrameArr.end(), f);
if (objIter == keyFrameArr.begin() && keyFrameArr.size() > 1){
for (int i = 1; i < keyFrameArr.size(); i++) {
keyFrameArr[i].Time -= 10;
}
}
keyFrameArr.erase(objIter);
this->Precompute();
}
/*
* Compute the tangent values of a keyframe.
*/
void Channel::computeTangents(){
for (int i = 0; i < keyFrameArr.size(); i++) {
if (i == 0) {
keyFrameArr[i].TangentIn = 0;
if (keyFrameArr[i].RuleOut == LINEAR_STR) {
keyFrameArr[i].TangentOut = (keyFrameArr[i+1].Value - keyFrameArr[i].Value) / ( keyFrameArr[i+1].Time - keyFrameArr[i].Time );
} else {
keyFrameArr[i].TangentOut = 0;
}
} else if (i == keyFrameArr.size()-1) {
keyFrameArr[i].TangentOut = 0;
if (keyFrameArr[i].RuleIn == LINEAR_STR) {
keyFrameArr[i].TangentIn = (keyFrameArr[i].Value - keyFrameArr[i-1].Value) / ( keyFrameArr[i].Time - keyFrameArr[i-1].Time );
} else {
keyFrameArr[i].TangentIn = 0;
}
} else {
if (keyFrameArr[i].RuleIn == FLAT_STR) {
keyFrameArr[i].TangentIn = 0;
} else if (keyFrameArr[i].RuleIn == LINEAR_STR) {
keyFrameArr[i].TangentIn = (keyFrameArr[i].Value - keyFrameArr[i-1].Value) / ( keyFrameArr[i].Time - keyFrameArr[i-1].Time );
} else if (keyFrameArr[i].RuleIn == SMOOTH_STR) {
keyFrameArr[i].TangentIn = (keyFrameArr[i+1].Value - keyFrameArr[i-1].Value) / ( keyFrameArr[i+1].Time - keyFrameArr[i-1].Time );
}
if (keyFrameArr[i].RuleOut == FLAT_STR) {
keyFrameArr[i].TangentOut = 0;
} else if (keyFrameArr[i].RuleOut == LINEAR_STR) {
keyFrameArr[i].TangentOut = (keyFrameArr[i+1].Value - keyFrameArr[i].Value) / ( keyFrameArr[i+1].Time - keyFrameArr[i].Time );
} else if (keyFrameArr[i].RuleOut == SMOOTH_STR) {
keyFrameArr[i].TangentOut = (keyFrameArr[i+1].Value - keyFrameArr[i-1].Value) / ( keyFrameArr[i+1].Time - keyFrameArr[i-1].Time );
}
}
}
}
/*
* Compute the cubic coefficients of a keyframe.
*/
void Channel::computeConstants(){
glMatrixMode(GL_MODELVIEW);
for (int i = 0; i < keyFrameArr.size(); i++) {
if (i != keyFrameArr.size()-1) {
float frameMatrix[16] = {
keyFrameArr[i].Value, 0, 0, 0,
keyFrameArr[i+1].Value, 0, 0, 0,
keyFrameArr[i].TangentOut, 0, 0, 0,
keyFrameArr[i+1].TangentIn, 0, 0, 0
};
glPushMatrix();
glLoadIdentity();
glMultMatrixf(frameMatrix);
glMultMatrixf(HERMITE_MATRIX);
glGetFloatv(GL_MODELVIEW_MATRIX, frameMatrix);
glPopMatrix();
keyFrameArr[i].A = frameMatrix[0];
keyFrameArr[i].B = frameMatrix[4];
keyFrameArr[i].C = frameMatrix[8];
keyFrameArr[i].D = frameMatrix[12];
}
}
}
/*
* Get the string value of the channel
*/
string Channel::toString(){
ostringstream oss;
oss << "channel" << "\n";
for (int i = 0; i < keyFrameArr.size(); i++) {
oss << "keyframe" << "\n";
oss << keyFrameArr[i].Time << " ";
oss << keyFrameArr[i].Value << " ";
oss << keyFrameArr[i].RuleIn << " ";
oss << keyFrameArr[i].RuleOut << "\n";
}
return oss.str();
}