CGI/common/include/gui/Camera.h

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2018-09-06 12:35:43 +00:00
/*
This file is part of NSEssentials.
Use of this source code is granted via a BSD-style license, which can be found
in License.txt in the repository root.
@author Wenzel Jakob
@author Nico Schertler
*/
#pragma once
#include <nanogui/glutil.h>
#include <nanogui/widget.h>
#include "math/BoundingBox.h"
namespace nse {
namespace gui
{
//Provides a 3D camera with arcball interaction capabilities.
class Camera
{
public:
//Initialize the camera. parent is the widget onto which the scene is rendered and is only used to query its size.
Camera(const nanogui::Widget& parent);
//Computes view and projection matrix for the current camera state.
void ComputeCameraMatrices(
Eigen::Matrix4f &view,
Eigen::Matrix4f &proj,
float customAspectRatio = 0) const;
//Applies a zoom by scaling the scene. Positive values of amount increase object sizes.
void Zoom(float amount);
//Sets the extent of the scene, which is kept between znear/zfar.
void SetSceneExtent(const nse::math::BoundingBox<float, 3>& bbox);
//Translates and zooms the camera in a way that it shows the entire bounding box while keeping the orientation.
//The parameters are only estimated; it is not guaranteed that the bounding box actually fits in the viewport.
void FocusOnBBox(const nse::math::BoundingBox<float, 3>& bbox);
//Keeps the camera's rotation and viewing distance and sets the focus point to the provided location.
void FocusOnPoint(const Eigen::Vector3f& point);
//Rotates the camera, such that it becomes horizontally aligned
void MakeHorizontal();
//Rotates the camera around the current focus point by rotation. The rotation is expressed in the
//camera's local coordinate system.
void RotateAroundFocusPointLocal(const Eigen::Quaternionf& rotation);
//Rotates the camera around the current focus point by rotation. The rotation is expressed in the
//global coordinate system.
void RotateAroundFocusPointGlobal(const Eigen::Quaternionf& rotation);
//Forwarded mouse button event.
bool HandleMouseButton(const Eigen::Vector2i &p, int button, bool down, int modifiers);
//Forwarded mouse move event.
bool HandleMouseMove(const Eigen::Vector2i &p, const Eigen::Vector2i &rel, int button, int modifiers);
//Forwarded resize event.
void resize(const Eigen::Vector2i & s);
//Returns the point that the camera focuses on
const Eigen::Vector3f& GetFocusPoint() const;
struct CamParams
{
nanogui::Arcball arcball;
//bounding sphere of scene
Eigen::Vector3f sceneCenter;
float sceneRadius;
float fovy = 45.0f;
Eigen::Vector3f focusPoint = Eigen::Vector3f::Zero();
float viewDistance = 5;
};
//Returns the current camera parameters
const CamParams& saveParams() const { return params; }
//Restores the camera parameters that have been previously saved.
void restoreParams(const CamParams& params) { this->params = params; }
private:
const nanogui::Widget& parent;
enum InteractionMode
{
None,
Translate,
Rotate
} interactionMode = None;
CamParams params;
Eigen::Vector3f modelTranslation_start = Eigen::Vector3f::Zero();
Eigen::Vector2i translation_start; //mouse position on the screen where translation started
};
}
}