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C-/C++-Quelltext

/*Defines the behaviour of a Camera object.*/
enum CameraMode : ubyte_t
{
    /*Represents the Camera Position and Target as detached absolute coordinates.
    Pos contains the absolute coordinates of the Camera.
    Target contains the absolute coordinates of the view target.*/
    CAMERA_MODE_LOOKAT_FIX = 0x00,
    /*Represents the Camera Position as attached to the Target.
    Pos contains the coordinates of the Camera relative to the view target.
    Target contains the absolute coordinates of the view target.*/
    CAMERA_MODE_LOOKAT_REL = 0x0F,
    /*Represents the Camera Target as attached to the Camera.
    Pos contains the absolute coordinates of the Camera.
    Target contains the coordinates of the view target relative to the Camera.
    */
    CAMERA_MODE_FACEDIR = 0xF0
};

C-/C++-Quelltext

class Camera
{
public:
    /*Creates a Camera object.
    mode defaults to CAMERA_MODE_LOOKAT_FIX.*/
    Camera();
    Camera(CameraMode mode);

    /*Sets the Pos value.
    This is not necessarily the absolute coordinate of the Camera.
    Mind the current CameraMode configuration set.*/
    void setPos(const math::vec3 &pos);
    /*Sets the Target value.
    This is not necessarily the absolute coordinate of the view target.
    Mind the current CameraMode configuration set.*/
    void setTarget(const math::vec3 &target);

    /*Sets the CameraMode.
    Note that this overrides the field 'mode' without converting the values - for that purpose, use convertTo(CameraMode).*/
    void setMode(CameraMode mode);

    /*Returns the Pos field.
    Note that this is not necessarily the absolute Camera coordinate.
    Mind the current CameraMode configuration set.*/
    const math::vec3 &getPos();
    /*Returns the Target field.
    Note that this is not necessarily the absolute view target coordinate.
    Mind the current CameraMode configuration set.*/
    const math::vec3 &getTarget();

    /*Converts the internal value representation to the given model.*/
    void convertTo(CameraMode newMode);

    /*Returns the current camera mode.*/
    CameraMode getMode();

private:
    math::vec3 pos;
    math::vec3 target;
    CameraMode mode;
};

C-/C++-Quelltext

void Camera::convertTo(CameraMode newMode)
{
    switch(mode)
    {
    case CAMERA_MODE_FACEDIR:
        {
            switch(newMode)
            {
            case CAMERA_MODE_FACEDIR:
                {
                    return;
                } break;
            case CAMERA_MODE_LOOKAT_FIX:
                {
                    target = pos+target;
                } break;
            case CAMERA_MODE_LOOKAT_REL:
                {
                    math::vec3 temp(target);
                    target = pos+target;
                    pos=-temp;
                } break;
            }
        } break;
    case CAMERA_MODE_LOOKAT_FIX:
        {
            switch(newMode)
            {
            case CAMERA_MODE_FACEDIR:
                {
                    target = target-pos;
                } break;
            case CAMERA_MODE_LOOKAT_FIX:
                {
                    return;
                } break;
            case CAMERA_MODE_LOOKAT_REL:
                {
                    pos = pos-target;
                } break;
            }
        } break;
    case CAMERA_MODE_LOOKAT_REL:
        {
            switch(newMode)
            {
            case CAMERA_MODE_FACEDIR:
                {
                    pos = target+pos;
                    target = target-pos;
                } break;
            case CAMERA_MODE_LOOKAT_FIX:
                {
                    pos = target + pos;
                } break;
            case CAMERA_MODE_LOOKAT_REL:
                {
                    return;
                } break;
            }
        } break;
    }
    mode = newMode;
}