cameracontroller.cpp

   1 /* $Id$
   2
   3 This file is part of R²C²
   4 Copyright © 2010-2011 Mikkosoft Productions, Mikko Rasa
   5 Distributed under the GPL
   6 */
   7
   8 #include <cmath>
   9 #include <msp/input/keys.h>
  10 #include "3d/layout.h"
  11 #include "cameracontroller.h"
  12
  13 using namespace std;
  14 using namespace Msp;
  15 using namespace R2C2;
  16
  17 CameraController::CameraController(View3D &v, Graphics::EventSource &es):
  18         view(v),
  19         event_source(es),
  20         camera(view.get_camera()),
  21         move_x(0),
  22         move_y(0),
  23         drag_mode(NONE)
  24 {
  25         event_source.signal_button_press.connect(sigc::mem_fun(this, &CameraController::button_press));
  26         event_source.signal_button_release.connect(sigc::mem_fun(this, &CameraController::button_release));
  27         event_source.signal_pointer_motion.connect(sigc::mem_fun(this, &CameraController::pointer_motion));
  28         event_source.signal_key_press.connect(sigc::mem_fun(this, &CameraController::key_press));
  29         event_source.signal_key_release.connect(sigc::mem_fun(this, &CameraController::key_release));
  30 }
  31
  32 void CameraController::top_down()
  33 {
  34         const GL::Vector3 &look = camera.get_look_direction();
  35         float xy_len = sqrt(look.x*look.x+look.y*look.y);
  36         set_look_direction(GL::Vector3(look.x*0.01/xy_len, look.y*0.01/xy_len, -0.99995));
  37 }
  38
  39 void CameraController::set_look_direction(const GL::Vector3 &look)
  40 {
  41         GL::Vector3 focus = get_focus();
  42         float dist = get_distance();
  43         camera.set_look_direction(look);
  44         camera.set_position(GL::Vector3(focus.x-look.x*dist, focus.y-look.y*dist, focus.z-look.z*dist));
  45 }
  46
  47 void CameraController::view_all()
  48 {
  49         view.view_all();
  50 }
  51
  52 void CameraController::move(float x, float y)
  53 {
  54         const GL::Vector3 &pos = camera.get_position();
  55         const GL::Vector3 &look = camera.get_look_direction();
  56         float xy_len = sqrt(look.x*look.x+look.y*look.y);
  57         float dx = (look.x*y+look.y*x)/xy_len;
  58         float dy = (look.y*y-look.x*x)/xy_len;
  59         camera.set_position(GL::Vector3(pos.x+dx, pos.y+dy, pos.z));
  60 }
  61
  62 void CameraController::adjust_distance(float delta)
  63 {
  64         const GL::Vector3 &pos = camera.get_position();
  65         const GL::Vector3 &look = camera.get_look_direction();
  66         float dist = get_distance();
  67         float low = view.get_layout().get_layout().get_catalogue().get_gauge()*5;
  68         if(dist+delta<low)
  69                 delta = low-dist;
  70         camera.set_position(GL::Vector3(pos.x-look.x*delta, pos.y-look.y*delta, pos.z-look.z*delta));
  71         dist += delta;
  72         camera.set_depth_clip(dist*0.02, dist*50);
  73 }
  74
  75 void CameraController::rotate(float angle)
  76 {
  77         GL::Vector3 look = camera.get_look_direction();
  78         float c = cos(angle);
  79         float s = sin(angle);
  80         set_look_direction(GL::Vector3(look.x*c-look.y*s, look.x*s+look.y*c, look.z));
  81 }
  82
  83 void CameraController::pitch(float angle)
  84 {
  85         GL::Vector3 look = camera.get_look_direction();
  86         float xy_len = sqrt(look.x*look.x+look.y*look.y);
  87         float c = cos(angle);
  88         float s = sin(angle);
  89         if(xy_len*c-look.z*s<0.01)
  90                 top_down();
  91         else if(xy_len*s+look.z*c>-0.01)
  92                 set_look_direction(GL::Vector3(look.x*0.99995/xy_len, look.y*0.99995/xy_len, -0.01));
  93         else
  94         {
  95                 float xy_scale = (xy_len*c-look.z*s)/xy_len;
  96                 set_look_direction(GL::Vector3(look.x*xy_scale, look.y*xy_scale, xy_len*s+look.z*c));
  97         }
  98 }
  99
 100 void CameraController::tick(float dt)
 101 {
 102         if(move_x || move_y)
 103         {
 104                 float scale = get_view_scale()*dt;
 105                 move(move_x*scale, move_y*scale);
 106         }
 107 }
 108
 109 void CameraController::button_press(int x, int y, unsigned btn, unsigned mod)
 110 {
 111         mod = Input::mod_from_sys(mod);
 112         if(btn==2 || btn==3)
 113         {
 114                 if(mod&Input::MOD_CONTROL)
 115                         drag_mode = DISTANCE;
 116                 else
 117                         drag_mode = ((btn==2)==((mod&Input::MOD_SHIFT)!=0) ? ROTATE : PAN);
 118
 119                 pointer_x = x;
 120                 pointer_y = y;
 121         }
 122         else if(btn==4)
 123         {
 124                 adjust_distance(-get_distance()*0.1);
 125         }
 126         else if(btn==5)
 127         {
 128                 adjust_distance(get_distance()*0.1);
 129         }
 130 }
 131
 132 void CameraController::button_release(int, int, unsigned btn, unsigned)
 133 {
 134         if(btn==2 || btn==3)
 135                 drag_mode = NONE;
 136 }
 137
 138 void CameraController::pointer_motion(int x, int y)
 139 {
 140         if(drag_mode!=NONE)
 141         {
 142                 int dx = x-pointer_x;
 143                 int dy = y-pointer_y;
 144
 145                 if(drag_mode==PAN)
 146                 {
 147                         float scale = get_view_scale()/event_source.get_height();
 148                         move(-dx*scale, dy*scale);
 149                 }
 150                 else if(drag_mode==ROTATE)
 151                 {
 152                         rotate(-dx*M_PI*2/event_source.get_width());
 153                         pitch(-dy*M_PI/event_source.get_height());
 154                 }
 155                 else if(drag_mode==DISTANCE)
 156                         adjust_distance(dy*3*get_distance()/event_source.get_height());
 157
 158                 pointer_x = x;
 159                 pointer_y = y;
 160         }
 161 }
 162
 163 void CameraController::key_press(unsigned code, unsigned, wchar_t)
 164 {
 165         unsigned key = Msp::Input::key_from_sys(code);
 166
 167         if(key==Msp::Input::KEY_RIGHT)
 168                 move_x = 1;
 169         else if(key==Msp::Input::KEY_LEFT)
 170                 move_x = -1;
 171         else if(key==Msp::Input::KEY_UP)
 172                 move_y = 1;
 173         else if(key==Msp::Input::KEY_DOWN)
 174                 move_y = -1;
 175         else if(key==Msp::Input::KEY_HOME)
 176                 view_all();
 177         else if(key==Msp::Input::KEY_INSERT)
 178                 top_down();
 179 }
 180
 181 void CameraController::key_release(unsigned code, unsigned)
 182 {
 183         unsigned key = Msp::Input::key_from_sys(code);
 184
 185         if(key==Msp::Input::KEY_RIGHT || key==Msp::Input::KEY_LEFT)
 186                 move_x = 0;
 187         else if(key==Msp::Input::KEY_UP || key==Msp::Input::KEY_DOWN)
 188                 move_y = 0;
 189 }
 190
 191 GL::Vector3 CameraController::get_focus() const
 192 {
 193         const GL::Vector3 &pos = camera.get_position();
 194         const GL::Vector3 &look = camera.get_look_direction();
 195         float dist = get_distance();
 196         return GL::Vector3(pos.x+look.x*dist, pos.y+look.y*dist, pos.z+look.z*dist);
 197 }
 198
 199 float CameraController::get_distance() const
 200 {
 201         return -camera.get_position().z/camera.get_look_direction().z;
 202 }
 203
 204 float CameraController::get_view_scale() const
 205 {
 206         float t = tan(camera.get_field_of_view()/2)*2;
 207         return get_distance()*t;
 208 }