cube-game-plus-plus/client/math/Camera.cpp

#include "client/math/Camera.h"
#include "client/Utils.h"

Camera::Camera() : oldLengthAngle(0), lengthAngle(0), oldWidthAngle(0), widthAngle(0)
{

}

const Vector& Camera::getFront() const
{
    return front;
}

const Vector& Camera::getBack() const
{
    return back;
}

const Vector& Camera::getRight() const
{
    return right;
}

const Vector& Camera::getLeft() const
{
    return left;
}

const Vector& Camera::getUp() const
{
    return up;
}

const Vector& Camera::getDown() const
{
    return down;
}

const Vector& Camera::getFlatFront() const
{
    return flatFront;
}

const Vector& Camera::getFlatBack() const
{
    return flatBack;
}

const Vector& Camera::getFlatRight() const
{
    return flatRight;
}

const Vector& Camera::getFlatLeft() const
{
    return flatLeft;
}

const Vector& Camera::getFlatUp() const
{
    return flatUp;
}

const Vector& Camera::getFlatDown() const
{
    return flatDown;
}

const Vector& Camera::getPosition() const
{
    return interPosition;
}

void Camera::storePosition()
{
    oldPosition = position;
    oldLengthAngle = lengthAngle;
    oldWidthAngle = widthAngle;
}

void Camera::setPosition(const Vector& pos, float length, float width)
{
    position = pos;
    lengthAngle = length;
    widthAngle = width;
}

void Camera::update(float lag)
{
    // back
    back.setAngles(interpolate(lag, oldLengthAngle, lengthAngle), interpolate(lag, oldWidthAngle, widthAngle));
    // front
    front.setInverse(back);
    // right
    right = front;
    right.cross(0.0f, 1.0f, 0.0f);
    right.normalize();
    // left
    left.setInverse(right);
    // up
    up = front;
    up.cross(left);
    up.normalize();
    // down
    down.setInverse(up);
    // interpolated position
    interPosition = oldPosition;
    interPosition.addMul(position, lag);
    interPosition.addMul(oldPosition, -lag);
    
    // flat back
    flatBack = back;
    flatBack.setY(0.0f);
    flatBack.normalize();
    // flat back
    flatFront.setInverse(flatBack);
    // flat right
    flatRight = front;
    flatRight.cross(0.0f, 1.0f, 0.0f);
    flatRight.normalize();
    // flat left
    flatLeft.setInverse(flatRight);
    // flat up
    flatUp.set(0.0f, 1.0f, 0.0f);
    // flat down
    flatDown.setInverse(flatUp);
}