source/designer/cameracontroller.cpp

   1 /* $Id$
   2
   3 This file is part of the MSP Märklin suite
   4 Copyright © 2010 Mikkosoft Productions, Mikko Rasa
   5 Distributed under the GPL
   6 */
   7
   8 #include <cmath>
   9 #include <msp/input/keys.h>
  10 #include "cameracontroller.h"
  11
  12 using namespace std;
  13 using namespace Msp;
  14
  15 CameraController::CameraController(Graphics::Window &w, GL::Camera &c):
  16         window(w),
  17         camera(c),
  18         move_x(0),
  19         move_y(0),
  20         zoom(0),
  21         rotate(0),
  22         pitch(0)
  23 {
  24         window.signal_key_press.connect(sigc::mem_fun(this, &CameraController::key_press));
  25         window.signal_key_release.connect(sigc::mem_fun(this, &CameraController::key_release));
  26 }
  27
  28 void CameraController::tick(float dt)
  29 {
  30         if(!move_x && !move_y && !zoom && !rotate && !pitch)
  31                 return;
  32
  33         GL::Vector3 pos = camera.get_position();
  34         GL::Vector3 look = camera.get_look_direction();
  35         float xy_len = sqrt(look.x*look.x+look.y*look.y);
  36         GL::Vector3 look_xy(look.x/xy_len, look.y/xy_len, 0);
  37         GL::Vector3 ground(pos.x-look.x*pos.z/look.z, pos.y-look.y*pos.z/look.z, 0);
  38
  39         if(rotate || pitch)
  40         {
  41                 float speed = -3*dt*xy_len*pos.z/look.z;
  42                 pos.x += (look_xy.y*rotate - look_xy.x*look.z*pitch)*speed;
  43                 pos.y += (-look_xy.x*rotate - look_xy.y*look.z*pitch)*speed;
  44                 pos.z += xy_len*pitch*speed;
  45                 camera.set_position(pos);
  46                 camera.look_at(ground);
  47         }
  48
  49         if(move_x || move_y || zoom)
  50         {
  51                 float zoom_speed = -zoom*pos.z/look.z;
  52                 pos.x += (look_xy.x*move_y + look_xy.y*move_x + look.x*zoom_speed)*dt;
  53                 pos.y += (look_xy.y*move_y - look_xy.x*move_x + look.y*zoom_speed)*dt;
  54                 pos.z += look.z*dt*zoom_speed;
  55                 camera.set_position(pos);
  56         }
  57 }
  58
  59 void CameraController::key_press(unsigned code, unsigned, wchar_t)
  60 {
  61         unsigned key = Msp::Input::key_from_sys(code);
  62
  63         if(key==Msp::Input::KEY_RIGHT)
  64                 rotate = -1;
  65         else if(key==Msp::Input::KEY_LEFT)
  66                 rotate = 1;
  67         else if(key==Msp::Input::KEY_UP)
  68                 move_y = 1;
  69         else if(key==Msp::Input::KEY_DOWN)
  70                 move_y = -1;
  71         else if(key==Msp::Input::KEY_INSERT)
  72                 zoom = -1;
  73         else if(key==Msp::Input::KEY_PGUP)
  74                 zoom = 1;
  75         else if(key==Msp::Input::KEY_HOME)
  76                 pitch = 1;
  77         else if(key==Msp::Input::KEY_END)
  78                 pitch = -1;
  79         else if(key==Msp::Input::KEY_DELETE)
  80                 move_x = -1;
  81         else if(key==Msp::Input::KEY_PGDN)
  82                 move_x = 1;
  83 }
  84
  85 void CameraController::key_release(unsigned code, unsigned)
  86 {
  87         unsigned key = Msp::Input::key_from_sys(code);
  88
  89         if(key==Msp::Input::KEY_RIGHT || key==Msp::Input::KEY_LEFT)
  90                 rotate = 0;
  91         else if(key==Msp::Input::KEY_UP || key==Msp::Input::KEY_DOWN)
  92                 move_y = 0;
  93         else if(key==Msp::Input::KEY_INSERT || key==Msp::Input::KEY_PGUP)
  94                 zoom = 0;
  95         else if(key==Msp::Input::KEY_HOME || key==Msp::Input::KEY_END)
  96                 pitch = 0;
  97         else if(key==Msp::Input::KEY_DELETE || key==Msp::Input::KEY_PGDN)
  98                 move_x = 0;
  99 }