/*
 *  GlobalEyePoint.cpp
 *  Martial
 *
 *  Created by ryoma on 10/01/28.
 *  Copyright 2010 琉球大学. All rights reserved.
 *
 */

#include "GlobalEyePoint.h"

GlobalEyePoint::GlobalEyePoint(char* name) : EyePoint(name) {
	Tman = new osgGA::TrackballManipulator();
	offset = osg::Vec3(0,10,-2);
	direction = osg::Vec3(0, 0, 90);
}

void GlobalEyePoint::setTarget(MovableObject* _target) {
	targets.push_back(_target);
}

void GlobalEyePoint::frame() {
	osg::Matrixd myCameraMatrix;
	osg::Matrixd cameraRotation;
	osg::Matrixd cameraTrans;
	osg::Matrixd centerTrans;

	std::list<MovableObject*>::iterator iter;

	osg::Vec3 center = osg::Vec3(0,0,0), tmp;
	float minX, maxX, minY, maxY, minZ, maxZ, length;
	
	for (iter = targets.begin(); iter != targets.end(); ++iter) {
		tmp = (*iter)->getPos();

		if (tmp.x() < minX) {
			minX = tmp.x();
		} else if (tmp.x() > maxX) {
			maxX = tmp.x();
		}

		if (tmp.x() < minY) {
			minY = tmp.y();
		} else if (tmp.y() > maxY) {
			maxY = tmp.y();
		}

		if (tmp.z() < minZ) {
			minZ = tmp.z();
		} else if (tmp.z() > maxZ) {
			minZ = tmp.z();
		}		
		
		center += tmp;
	}

	length = (osg::Vec3(maxX+minX, maxY+minY, maxZ+minZ).length()) * Martial::CONFIG::WINDOW_WIDTH / 500;

	if (length < 10.0) length = 10.0;

	center /= (float)targets.size();

	position = osg::Vec3(center.x(), length, center.z())+offset;

	cameraRotation.makeRotate(direction.z(), osg::Vec3(0,0,1));
	myCameraMatrix.makeLookAt(position, center, osg::Vec3(0,0,1) * cameraRotation);

	Tman->setByInverseMatrix(myCameraMatrix);
}