Quaternion interpolation test

QuatTestApp.cpp

#include "cinder/app/AppNative.h"
#include "cinder/gl/gl.h"
#include "cinder/Quaternion.h"
#include "cinder/Timeline.h"
#include "cinder/MayaCamUI.h"

using namespace ci;
using namespace ci::app;
using namespace std;

class QuatTestApp : public AppNative {
  public:
  void setup();
	void keyDown( KeyEvent event );
	void mouseDown( MouseEvent event );
	void mouseDrag( MouseEvent event );
	void resize();
	void update();
	void draw();
private:
	Quatf mStartQuat, mEndQuat;
	Anim<Quatf> mCube1Rotation;
	Quatf mCube2Rotation;
	
	MayaCamUI mMayaCam;
	TimelineRef mTimeline;
	float mTimestep;
};

void QuatTestApp::setup()
{
	mStartQuat = Quatf( 0.0f, 0.0f, 1.0f, 0.0f);
	mEndQuat = Quatf( M_PI, 2.5f, 0.83f);
	mCube1Rotation = mCube2Rotation = mStartQuat;
	
	mTimestep = 1.0f;
	mTimeline = Timeline::create();
	gl::enableDepthRead();
}

void QuatTestApp::keyDown( KeyEvent event )
{
	mTimestep = 0.0f;
	if( event.getChar() == ' ' ) {
		mTimeline->apply( &mCube1Rotation, mStartQuat, mEndQuat, 1.0f );
	}
}

void QuatTestApp::mouseDown( MouseEvent event )
{
	mMayaCam.mouseDown( event.getPos() );
}

void QuatTestApp::mouseDrag( MouseEvent event )
{
	mMayaCam.mouseDrag( event.getPos(), event.isLeftDown(), event.isMiddleDown(), event.isRightDown() );
}

void QuatTestApp::resize()
{
	CameraPersp cam = mMayaCam.getCamera();
	cam.setAspectRatio( getWindowAspectRatio() );
	mMayaCam.setCurrentCam( cam );
}

void QuatTestApp::update()
{
	float step = 0.005f;
	mTimeline->step( step );
	if( mTimestep < 1.0f ) {
		mTimestep += step;
		mCube2Rotation = mStartQuat.lerp(mTimestep, mEndQuat);
	}
}

void QuatTestApp::draw()
{
	gl::clear( Color( 0, 0, 0 ) );
	gl::setMatrices( mMayaCam.getCamera() );
	
	gl::pushModelView();
	gl::translate(-10.f, 0, 0);
	gl::rotate( mCube1Rotation.value() );
	gl::drawColorCube(Vec3f(0,0,0), Vec3f(10.0f, 10.0f, 10.0f));
	gl::popModelView();
	
	gl::pushModelView();
	gl::translate(10.f, 0, 0);
	gl::rotate( mCube2Rotation );
	gl::drawColorCube(Vec3f(0,0,0), Vec3f(10.0f, 10.0f, 10.0f));
	gl::popModelView();
}

CINDER_APP_NATIVE( QuatTestApp, RendererGl )