physics1.cpp

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/*
 * physics.cpp
 *
 *  Created on: Dec 19, 2011
 *      Author: sushil
 */
#include <assert.h>

#include <OgreVector3.h>

#include <physics.h>
#include <ent.h>
#include <utils.h>
#include "DEBUG.h"

void FastEcslent::Physics2D1::init(){
        entity->desiredSpeed = entity->speed;
        entity->desiredHeading = entity->heading;
}

void FastEcslent::Physics2D1::doHelmsman(double dtime){

        if (kInvalidFloat == entity->desiredSpeed || kInvalidFloat == entity->desiredHeading)
                return;
        //speed
        timeScaledAcceleration = entity->maxAcceleration * dtime;
        entity->speed += clamp(entity->desiredSpeed - entity->speed, -timeScaledAcceleration, +timeScaledAcceleration);
        cosYaw = cos(-entity->heading);
        sinYaw = sin(-entity->heading);
        entity->vel = Ogre::Vector3(entity->speed * cosYaw, 0.0f, entity->speed * sinYaw);
        entity->pos = entity->pos + (entity->vel * dtime);

        //heading
        this->timeScaledRotationalSpeed = entity->maxRotationalSpeed * dtime;
        //rotate only if you are moving at > 0.5
        if(entity->speed > 0.5f){
                angleDiff = differenceBetweenAngles(entity->desiredHeading, entity->heading);
                dHeading = clamp(angleDiff, -timeScaledRotationalSpeed, +timeScaledRotationalSpeed);
                entity->heading += dHeading;
        }

        DEBUG(std::cout << "Speed: " << entity->speed << ", Heading: " << entity->heading << std::endl;)
}


void FastEcslent::Physics2D1::tick(double dtime){
        doHelmsman(dtime);
}

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