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#include <BALL/VIEW/RENDERING/camera.h>
#include <BALL/VIEW/KERNEL/common.h>
#include <iostream>
namespace BALL
{
namespace VIEW
{
Camera::Camera()
: view_point_(0, 0, 0),
look_at_(0, 0, -1),
look_up_vector_(0, -1, 0),
projection_mode_(PERSPECTIVE)
{
calculateVectors_();
}
Camera::Camera(const Camera& camera)
: view_point_(camera.view_point_),
look_at_(camera.look_at_),
look_up_vector_(camera.look_up_vector_),
view_vector_(camera.view_vector_),
right_vector_(camera.right_vector_),
projection_mode_(camera.projection_mode_)
{
}
Camera::Camera(const Vector3& view_point, const Vector3& look_at, const Vector3& look_up_vector, const ProjectionMode& mode)
: view_point_(view_point),
look_at_(look_at),
look_up_vector_(look_up_vector),
projection_mode_(mode)
{
calculateVectors_();
}
Camera& Camera::operator = (const Camera& camera)
{
view_point_ = camera.view_point_;
look_at_ = camera.look_at_;
look_up_vector_ = camera.look_up_vector_;
view_vector_ = camera.view_vector_;
right_vector_ = camera.right_vector_;
projection_mode_ = camera.projection_mode_;
return *this;
}
bool Camera::operator < (const Camera& camera) const
{
return this < &camera;
}
bool Camera::operator == (const Camera& camera) const
{
return view_point_ == camera.view_point_ &&
look_at_ == camera.look_at_ &&
look_up_vector_ == camera.look_up_vector_ &&
projection_mode_ == camera.projection_mode_;
}
void Camera::calculateVectors_()
{
view_vector_ = look_at_ - view_point_;
if (look_up_vector_.isZero())
look_up_vector_.set(0,1,0);
else
{
Vector3 normalized_view(view_vector_);
normalized_view.normalize();
look_up_vector_ -= normalized_view*(normalized_view*look_up_vector_);
look_up_vector_.normalize();
}
right_vector_ = look_up_vector_ % view_vector_;
right_vector_ *= -1.0;
if (!right_vector_.isZero()) right_vector_.normalize();
else right_vector_.set(1,0,0);
}
void Camera::dump(std::ostream& s, Size depth) const
{
BALL_DUMP_STREAM_PREFIX(s);
BALL_DUMP_DEPTH(s, depth);
BALL_DUMP_HEADER(s, this, this);
BALL_DUMP_DEPTH(s, depth);
s << "Viewpoint : " << view_point_ << std::endl;
BALL_DUMP_DEPTH(s, depth);
s << "Look at : " << look_at_ << std::endl;
BALL_DUMP_DEPTH(s, depth);
s << "Look up vector: " << look_up_vector_ << std::endl;
BALL_DUMP_DEPTH(s, depth);
s << "Projection mode: " << ((projection_mode_ == PERSPECTIVE) ? "perspective" : "orthographic") << std::endl;
BALL_DUMP_STREAM_SUFFIX(s);
}
String Camera::toString() const
{
// NOTE: we do *not* store the projection mode when we write the current camera.
// Instead, it is extracted from the stage settings dialog. If we would store
// it here, we would break backwards compatibility severely.
return vector3ToString(view_point_) + " " +
vector3ToString(look_at_) + " " +
vector3ToString(look_up_vector_);
}
bool Camera::readFromString(const String& data)
{
vector<String> fields;
if (data.split(fields) < 3) return false;
Vector3 results[3];
for (Position p = 0; p < 3; p++)
{
if (!stringToVector3(fields[p], results[p])) return false;
}
view_point_ = results[0];
look_at_ = results[1];
look_up_vector_ = results[2];
calculateVectors_();
return true;
}
void Camera::rotate(const Quaternion& q, const Vector3& origin)
{
translate(-origin);
Matrix4x4 m;
q.getRotationMatrix(m);
view_point_ = m*view_point_;
look_at_ = m*look_at_;
look_up_vector_ = m*look_up_vector_;
calculateVectors_();
translate(origin);
}
void Camera::rotate(const Matrix4x4& mat, const Vector3& origin)
{
translate(-origin);
view_point_ = mat*view_point_;
look_at_ = mat*look_at_;
look_up_vector_ = mat*look_up_vector_;
calculateVectors_();
translate(origin);
}
void Camera::rotateAboutView(float degree)
{
Matrix4x4 m;
m.setRotation(Angle(-degree, false), view_vector_);
// setLookUp takes care of normalization and the right vector for us...
setLookUpVector(m * look_up_vector_);
}
void Camera::translate(const Vector3& v)
{
view_point_ += v;
look_at_ += v;
calculateVectors_();
}
Vector3 Camera::convertCameraToSceneCoordinates(const Vector3& v)
{
Vector3 vv = view_vector_;
float length = vv.getLength();
if (!Maths::isZero(length)) vv /= length;
return v.x * right_vector_ +
v.y * look_up_vector_ -
v.z * vv;
}
} // namespace VIEW
} // namespace BALL
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