source/packet.cpp

   1 #include <cmath>
   2 #include <msp/gl/immediate.h>
   3 #include <msp/gl/matrix.h>
   4 #include <msp/gl/transform.h>
   5 #include <msp/time/units.h>
   6 #include "host.h"
   7 #include "packet.h"
   8
   9 using namespace Msp;
  10
  11 Packet::Packet(const Host &s, const Host *d, const GL::Color &c, unsigned i):
  12         src(s),
  13         dest(d),
  14         color(c),
  15         x(0),
  16         size(cbrt(i)),
  17         angle(rand()*180.0/RAND_MAX),
  18         rspeed(rand()*180.0/RAND_MAX-90.0)
  19 {
  20 }
  21
  22 void Packet::tick(const Time::TimeDelta &dt)
  23 {
  24         double f=dt/Time::sec;
  25         x+=f;
  26         if(x>1)
  27                 x=1;
  28         angle+=rspeed*f;
  29         if(angle<0)
  30                 angle+=360;
  31         if(angle>=360)
  32                 angle-=360;
  33 }
  34
  35 void Packet::render() const
  36 {
  37         GL::push_matrix();
  38
  39         const Vector2 &spos=src.get_position();
  40
  41         if(dest)
  42         {
  43                 const Vector2 &dpos=dest->get_position();
  44                 GL::translate(spos.x*(1-x)+dpos.x*x, spos.y*(1-x)+dpos.y*x, 0);
  45                 GL::rotate(angle, 0, 0, 1);
  46
  47                 GL::Immediate imm((GL::COLOR4_UBYTE,GL::VERTEX2));
  48                 imm.begin(GL::QUADS);
  49                 imm.color(color.r, color.g, color.b, color.a);
  50                 imm.vertex(-size, -size);
  51                 imm.vertex(size, -size);
  52                 imm.vertex(size, size);
  53                 imm.vertex(-size, size);
  54                 imm.end();
  55         }
  56         else
  57         {
  58                 GL::translate(spos.x, spos.y, 0);
  59                 GL::Immediate imm((GL::COLOR4_UBYTE,GL::VERTEX2));
  60                 imm.begin(GL::TRIANGLE_FAN);
  61                 imm.color(color.r, color.g, color.b, color.a*(1-x));
  62                 imm.vertex(0, 0);
  63                 for(unsigned i=0; i<=24; ++i)
  64                 {
  65                         float a=i*M_PI/12;
  66                         imm.vertex(cos(a)*x*200, sin(a)*x*200);
  67                 }
  68                 imm.end();
  69         }
  70
  71         GL::pop_matrix();
  72 }