source: GTP/trunk/App/Demos/Vis/CHC_revisited/Camera.cpp @ 2753

#include "common.h"
#include "Camera.h"



namespace CHCDemo 
{


Camera::Camera() 
{
        mWidth = 100;
        mHeight = 100;
        mFovy = 90.0f * M_PI/180.0f;
}


Camera::Camera(int width, int height, float fieldOfView) 
{
        mWidth = width;
        mHeight = height;
        
        mFovy = fieldOfView * M_PI/180.0f;
}


void Camera::Precompute() 
{
        mDirection.Normalize();

        Vector3 side = CrossProd(Vector3(0,1,0), mDirection);
        mUp = Normalize(CrossProd(side, mDirection));
        mRight = Normalize(CrossProd(mDirection, mUp));

        float k = tan(mFovy/2);
        mUp *= k;
        mRight *= k*mWidth/mHeight;
}


void Camera::SetPosition(const Vector3 &pos) 
{
        mPosition = pos;
        Precompute();
}


void Camera::SetDirection(const Vector3 &dir) 
{
        mDirection = dir;
        Precompute();
}


void Camera::LookInBox(const AxisAlignedBox3 &box)
{
        mDirection = Vector3(0,0,1);
        mPosition = box.Center();

        Precompute();
}


void Camera::LookAtBox(const AxisAlignedBox3 &box)
{
        mDirection = box.Max() - box.Min();
        mPosition = box.Min() - mDirection;

        Precompute();
}

}