source/host.cpp

   1 #include <cmath>
   2 #include <netinet/in.h>
   3 #include <arpa/inet.h>
   4 #include <msp/gl/immediate.h>
   5 #include <msp/gl/matrix.h>
   6 #include <msp/gl/texture.h>
   7 #include <msp/gl/transform.h>
   8 #include <msp/time/units.h>
   9 #include "host.h"
  10 #include "netvis.h"
  11
  12 using namespace std;
  13 using namespace Msp;
  14
  15 Host::Host(NetVis &nv, unsigned a):
  16         netvis(nv),
  17         addr(a)
  18 {
  19         in_addr ina;
  20         ina.s_addr=htonl(addr);
  21         name=inet_ntoa(ina);
  22 }
  23
  24 void Host::set_position(const Vector2 &p)
  25 {
  26         pos=p;
  27 }
  28
  29 void Host::add_connection(Connection &)
  30 {
  31 }
  32
  33 Connection *Host::get_connection(Host &)
  34 {
  35         return 0;
  36 }
  37
  38 void Host::tick(const Msp::Time::TimeDelta &td)
  39 {
  40         float dt=td/Msp::Time::sec;
  41
  42         const map<unsigned, Host *> &hosts=netvis.get_hosts();
  43         float fx=-pos.x*0.1;
  44         float fy=-pos.y*0.1;
  45         for(map<unsigned, Host *>::const_iterator i=hosts.begin(); i!=hosts.end(); ++i)
  46         {
  47                 if(i->second!=this)
  48                 {
  49                         const Vector2 &other_pos=i->second->get_position();
  50                         float dx=other_pos.x-pos.x;
  51                         float dy=other_pos.y-pos.y;
  52                         float d2=dx*dx+dy*dy;
  53                         float d=sqrt(d2);
  54
  55                         unsigned other_addr=i->second->get_address();
  56                         unsigned matching_bits=0;
  57                         for(unsigned j=32; (j-- && !((addr^other_addr)>>j));)
  58                                 ++matching_bits;
  59
  60                         float nearness=24-min(matching_bits, 24U);
  61                         float f=10000.0*(1.0/(60+nearness*15)-1.0/d);
  62
  63                         fx+=dx/d*f;
  64                         fy+=dy/d*f;
  65                 }
  66         }
  67
  68         if(fx<-4 || fx>4)
  69                 pos.x+=fx*dt;
  70         if(fy<-4 || fy>4)
  71                 pos.y+=fy*dt;
  72 }
  73
  74 void Host::render() const
  75 {
  76         GL::push_matrix();
  77         GL::translate(static_cast<int>(pos.x), static_cast<int>(pos.y), 0);
  78
  79         GL::Immediate imm((GL::COLOR4_UBYTE, GL::VERTEX2));
  80         imm.begin(GL::QUADS);
  81         imm.color(1.0f, 1.0f, 1.0f, 1.0f);
  82         imm.vertex(-5, -5);
  83         imm.vertex(5, -5);
  84         imm.vertex(5, 5);
  85         imm.vertex(-5, 5);
  86         imm.end();
  87
  88         const GL::Font &font=netvis.get_font();
  89         GL::translate(-static_cast<int>(font.get_string_width(name)*5), 6, 0);
  90         GL::scale_uniform(10);
  91         font.draw_string(name);
  92         GL::Texture::unbind();
  93
  94         GL::pop_matrix();
  95 }