source/designer/cameracontroller.cpp

   1 #include <cmath>
   2 #include <msp/input/keys.h>
   3 #include "3d/layout.h"
   4 #include "cameracontroller.h"
   5
   6 using namespace std;
   7 using namespace Msp;
   8 using namespace R2C2;
   9
  10 CameraController::CameraController(View3D &v, Input::Keyboard &k, Input::Mouse &m):
  11         view(v),
  12         keyboard(k),
  13         mouse(m),
  14         camera(view.get_camera()),
  15         move_x(0),
  16         move_y(0),
  17         shift_pressed(false),
  18         ctrl_pressed(false),
  19         drag_mode(NONE)
  20 {
  21         mouse.signal_button_press.connect(sigc::bind_return(sigc::mem_fun(this, &CameraController::button_press), false));
  22         mouse.signal_button_release.connect(sigc::bind_return(sigc::mem_fun(this, &CameraController::button_release), false));
  23         mouse.signal_axis_motion.connect(sigc::bind_return(sigc::mem_fun(this, &CameraController::axis_motion), false));
  24         keyboard.signal_button_press.connect(sigc::bind_return(sigc::mem_fun(this, &CameraController::key_press), false));
  25         keyboard.signal_button_release.connect(sigc::bind_return(sigc::mem_fun(this, &CameraController::key_release), false));
  26 }
  27
  28 void CameraController::top_down()
  29 {
  30         const GL::Vector3 &look = camera.get_look_direction();
  31         float xy_len = sqrt(look.x*look.x+look.y*look.y);
  32         set_look_direction(GL::Vector3(look.x*0.01/xy_len, look.y*0.01/xy_len, -0.99995));
  33 }
  34
  35 void CameraController::set_look_direction(const GL::Vector3 &look)
  36 {
  37         GL::Vector3 focus = get_focus();
  38         float dist = get_distance();
  39         camera.set_look_direction(look);
  40         camera.set_position(focus-look*dist);
  41 }
  42
  43 void CameraController::view_all()
  44 {
  45         view.view_all();
  46 }
  47
  48 void CameraController::move(float x, float y)
  49 {
  50         const GL::Vector3 &pos = camera.get_position();
  51         const GL::Vector3 &look = camera.get_look_direction();
  52         GL::Vector3 fwd_dir = normalize(GL::Vector3(look.x, look.y, 0));
  53         GL::Vector3 right_dir = cross(fwd_dir, GL::Vector3(0, 0, 1));
  54         camera.set_position(pos+fwd_dir*y+right_dir*x);
  55 }
  56
  57 void CameraController::adjust_distance(float delta)
  58 {
  59         const GL::Vector3 &pos = camera.get_position();
  60         const GL::Vector3 &look = camera.get_look_direction();
  61         float dist = get_distance();
  62         // XXX This should probably depend on the layout contents in some way
  63         float low = 0.1;
  64         if(dist+delta<low)
  65                 delta = low-dist;
  66         camera.set_position(pos-look*delta);
  67         dist += delta;
  68         camera.set_depth_clip(dist*0.02, dist*50);
  69 }
  70
  71 void CameraController::rotate(const Angle &angle)
  72 {
  73         GL::Vector3 look = camera.get_look_direction();
  74         set_look_direction(rotated_vector(look, angle));
  75 }
  76
  77 void CameraController::pitch(const Angle &angle)
  78 {
  79         GL::Vector3 look = camera.get_look_direction();
  80         float xy_len = sqrt(look.x*look.x+look.y*look.y);
  81         float c = cos(angle);
  82         float s = sin(angle);
  83         if(xy_len*c-look.z*s<0.01)
  84                 top_down();
  85         else if(xy_len*s+look.z*c>-0.01)
  86                 set_look_direction(GL::Vector3(look.x*0.99995/xy_len, look.y*0.99995/xy_len, -0.01));
  87         else
  88         {
  89                 float xy_scale = (xy_len*c-look.z*s)/xy_len;
  90                 set_look_direction(GL::Vector3(look.x*xy_scale, look.y*xy_scale, xy_len*s+look.z*c));
  91         }
  92 }
  93
  94 void CameraController::tick(float dt)
  95 {
  96         if(move_x || move_y)
  97         {
  98                 float scale = get_view_scale()*dt;
  99                 move(move_x*scale, move_y*scale);
 100         }
 101 }
 102
 103 void CameraController::button_press(unsigned btn)
 104 {
 105         if(btn==2 || btn==3)
 106         {
 107                 if(ctrl_pressed)
 108                         drag_mode = DISTANCE;
 109                 else
 110                         drag_mode = ((btn==2)==shift_pressed ? ROTATE : PAN);
 111         }
 112         else if(btn==4)
 113                 adjust_distance(-get_distance()*0.1);
 114         else if(btn==5)
 115                 adjust_distance(get_distance()*0.1);
 116 }
 117
 118 void CameraController::button_release(unsigned btn)
 119 {
 120         if(btn==2 || btn==3)
 121                 drag_mode = NONE;
 122 }
 123
 124 void CameraController::axis_motion(unsigned axis, float, float change)
 125 {
 126         if(drag_mode==PAN)
 127         {
 128                 float dx = (axis==0 ? change : 0);
 129                 float dy = (axis==1 ? change : 0);
 130                 float scale = get_view_scale();
 131                 move(-dx*scale, -dy*scale);
 132         }
 133         else if(drag_mode==ROTATE)
 134         {
 135                 if(axis==0)
 136                         rotate(Angle::from_turns(-change/2));
 137                 else if(axis==1)
 138                         pitch(Angle::from_turns(change/4));
 139         }
 140         else if(drag_mode==DISTANCE && axis==1)
 141                 adjust_distance(-change*3*get_distance());
 142 }
 143
 144 void CameraController::key_press(unsigned key)
 145 {
 146         if(key==Msp::Input::KEY_RIGHT)
 147                 move_x = 1;
 148         else if(key==Msp::Input::KEY_LEFT)
 149                 move_x = -1;
 150         else if(key==Msp::Input::KEY_UP)
 151                 move_y = 1;
 152         else if(key==Msp::Input::KEY_DOWN)
 153                 move_y = -1;
 154         else if(key==Msp::Input::KEY_HOME)
 155                 view_all();
 156         else if(key==Msp::Input::KEY_INSERT)
 157                 top_down();
 158         else if(key==Msp::Input::KEY_SHIFT_L || key==Msp::Input::KEY_SHIFT_R)
 159                 shift_pressed = true;
 160         else if(key==Msp::Input::KEY_CTRL_L || key==Msp::Input::KEY_CTRL_R)
 161                 ctrl_pressed = true;
 162 }
 163
 164 void CameraController::key_release(unsigned key)
 165 {
 166         if(key==Msp::Input::KEY_RIGHT || key==Msp::Input::KEY_LEFT)
 167                 move_x = 0;
 168         else if(key==Msp::Input::KEY_UP || key==Msp::Input::KEY_DOWN)
 169                 move_y = 0;
 170         else if(key==Msp::Input::KEY_SHIFT_L || key==Msp::Input::KEY_SHIFT_R)
 171                 shift_pressed = false;
 172         else if(key==Msp::Input::KEY_CTRL_L || key==Msp::Input::KEY_CTRL_R)
 173                 ctrl_pressed = false;
 174 }
 175
 176 GL::Vector3 CameraController::get_focus() const
 177 {
 178         const GL::Vector3 &pos = camera.get_position();
 179         const GL::Vector3 &look = camera.get_look_direction();
 180         float dist = get_distance();
 181         return GL::Vector3(pos.x+look.x*dist, pos.y+look.y*dist, pos.z+look.z*dist);
 182 }
 183
 184 float CameraController::get_distance() const
 185 {
 186         return -camera.get_position().z/camera.get_look_direction().z;
 187 }
 188
 189 float CameraController::get_view_scale() const
 190 {
 191         float t = tan(camera.get_field_of_view()/2.0f)*2.0f;
 192         return get_distance()*t;
 193 }