unicam.h

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/*
 This file is part of the MinGfx Project.
 
 Copyright (c) 2017,2018 Regents of the University of Minnesota.
 All Rights Reserved.
 
 Original Author(s) of this File:
    Dan Keefe, 2018, University of Minnesota
    
 Author(s) of Significant Updates/Modifications to the File:
    ...
 */
 
#ifndef SRC_UNICAM_H_
#define SRC_UNICAM_H_
 
#include "quick_shapes.h"
#include "point2.h"
#include "point3.h"
#include "vector2.h"
#include "vector3.h"
 
 
namespace mingfx {
 
    
class UniCam {
public:  
    
    UniCam();
 
    UniCam(const Matrix4 &initialViewMatrix);
    
    virtual ~UniCam();
 
    
    // To make the interaction work, the following set of functions need to be
    // called from your GraphicsApp or whatever main application class you use
    // to receive user input events and a draw callback.
    
    void OnButtonDown(const Point2 &normalizedMousePos, float mouseZ);
    
    void OnDrag(const Point2 &normalizedMousePos);
    
    void OnButtonUp(const Point2 &normalizedMousePos);
    
    void AdvanceAnimation(double dt);
 
    void Draw(const Matrix4 &projectionMatrix);
    
    
    Matrix4 view_matrix();
    
    
    Point3 eye();
    
    Vector3 look();
    
    
    // -------------
    
    void set_view_matrix(Matrix4 viewMatrix);
    
    void set_default_depth(float d);
    
    
private:
    
    void recalc_angular_vel();
    
    enum class UniCamState {
        START,
        PAN_DOLLY_ROT_DECISION,
        PAN_DOLLY_DECISION,
        ROT_WAIT_FOR_SECOND_CLICK,
        PAN,
        DOLLY,
        ROT,
        SPINNING
    };
    UniCamState state_;
    
    Point2  mouseLast_;
    double  elapsedTime_;
 
    Point2  initialClickPos_;
    bool    hitGeometry_;
    Point3  hitPoint_;
 
    bool    rotInitialized_;
    Point3  rotLastIPoint_;
    float   boundingSphereRad_;
    Point3  boundingSphereCtr_;
    double  rotLastTime_;
    std::vector<std::pair<double, double>> rotAngularVelBuffer_;
    double rotAngularVel_;
    Vector3 rotAxis_;
    
    bool    dollyInitialized_;
    float   dollyFactor_;
    float   defaultDepth_;
    
    bool    showIcon_;
    QuickShapes quickShapes_;
 
    Matrix4 V_;
    Matrix4 Vstart_;
 
    // saved from the last draw call in order to unproject the mouse pos
    Matrix4 Pdraw_;
};
 
    
} // end namespace
 
#endif