source/packet.cpp

   1 /* $Id$
   2
   3 This file is part of NetVis
   4 Copyright @ 2008 Mikko Rasa, Mikkosoft Productions
   5 Distributed unter the GPL
   6 */
   7
   8 #include <cmath>
   9 #include <cstdlib>
  10 #include <msp/gl/immediate.h>
  11 #include <msp/gl/matrix.h>
  12 #include <msp/gl/transform.h>
  13 #include <msp/time/units.h>
  14 #include "host.h"
  15 #include "packet.h"
  16
  17 using namespace Msp;
  18
  19 Packet::Packet(const Host &s, const Host *d, const GL::Color &c, unsigned i):
  20         src(s),
  21         dest(d),
  22         color(c),
  23         x(0),
  24         size(cbrt(i)*1.5),
  25         angle(rand()*M_PI*2/RAND_MAX),
  26         rspeed(rand()*M_PI/RAND_MAX-M_PI/2)
  27 { }
  28
  29 void Packet::tick(const Time::TimeDelta &dt)
  30 {
  31         double f=dt/Time::sec;
  32         x+=f;
  33         if(x>1)
  34                 x=1;
  35         angle+=rspeed*f;
  36         if(angle<0)
  37                 angle+=M_PI*2;
  38         if(angle>=M_PI*2)
  39                 angle-=M_PI;
  40 }
  41
  42 void Packet::render(GL::PrimitiveBuilder &bld) const
  43 {
  44         if(x<0)
  45                 return;
  46         if(!src.get_active() || (dest && !dest->get_active()))
  47                 return;
  48
  49         const Vector2 &spos=src.get_position();
  50
  51         if(dest)
  52         {
  53                 const Vector2 &dpos=dest->get_position();
  54                 Vector2 pos(spos.x*(1-x)+dpos.x*x, spos.y*(1-x)+dpos.y*x);
  55                 Vector2 corner(cos(angle)*size, sin(angle)*size);
  56
  57                 if(bld.get_type()!=GL::QUADS)
  58                 {
  59                         bld.end();
  60                         bld.begin(GL::QUADS);
  61                 }
  62                 bld.color(color.r, color.g, color.b, color.a);
  63                 bld.vertex(pos.x+corner.x, pos.y+corner.y);
  64                 bld.vertex(pos.x-corner.y, pos.y+corner.x);
  65                 bld.vertex(pos.x-corner.x, pos.y-corner.y);
  66                 bld.vertex(pos.x+corner.y, pos.y-corner.x);
  67         }
  68         else
  69         {
  70                 bld.end();
  71                 bld.begin(GL::TRIANGLE_FAN);
  72                 bld.color(color.r, color.g, color.b, color.a*(1-x));
  73                 bld.vertex(spos.x, spos.y);
  74                 for(unsigned i=0; i<=24; ++i)
  75                 {
  76                         float a=i*M_PI/12;
  77                         bld.vertex(spos.x+cos(a)*x*200, spos.y+sin(a)*x*200);
  78                 }
  79         }
  80 }