src/util/pointedthing.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "pointedthing.h"
  21
  22 #include "serialize.h"
  23 #include "../exceptions.h"
  24 #include <sstream>
  25
  26 PointedThing::PointedThing():
  27         type(POINTEDTHING_NOTHING),
  28         node_undersurface(0,0,0),
  29         node_abovesurface(0,0,0),
  30         node_real_undersurface(0,0,0),
  31         intersection_point(0,0,0),
  32         intersection_normal(0,0,0),
  33         object_id(-1)
  34 {}
  35
  36 std::string PointedThing::dump() const
  37 {
  38         std::ostringstream os(std::ios::binary);
  39         if (type == POINTEDTHING_NOTHING) {
  40                 os<<"[nothing]";
  41         } else if (type == POINTEDTHING_NODE) {
  42                 const v3s16 &u = node_undersurface;
  43                 const v3s16 &a = node_abovesurface;
  44                 os<<"[node under="<<u.X<<","<<u.Y<<","<<u.Z
  45                         << " above="<<a.X<<","<<a.Y<<","<<a.Z<<"]";
  46         } else if (type == POINTEDTHING_OBJECT) {
  47                 os<<"[object "<<object_id<<"]";
  48         } else {
  49                 os<<"[unknown PointedThing]";
  50         }
  51         return os.str();
  52 }
  53
  54 void PointedThing::serialize(std::ostream &os) const
  55 {
  56         writeU8(os, 0); // version
  57         writeU8(os, (u8)type);
  58         switch (type) {
  59         case POINTEDTHING_NOTHING:
  60                 break;
  61         case POINTEDTHING_NODE:
  62                 writeV3S16(os, node_undersurface);
  63                 writeV3S16(os, node_abovesurface);
  64                 break;
  65         case POINTEDTHING_OBJECT:
  66                 writeS16(os, object_id);
  67                 break;
  68         }
  69 }
  70
  71 void PointedThing::deSerialize(std::istream &is)
  72 {
  73         int version = readU8(is);
  74         if (version != 0) throw SerializationError(
  75                         "unsupported PointedThing version");
  76         type = (PointedThingType) readU8(is);
  77         switch (type) {
  78         case POINTEDTHING_NOTHING:
  79                 break;
  80         case POINTEDTHING_NODE:
  81                 node_undersurface = readV3S16(is);
  82                 node_abovesurface = readV3S16(is);
  83                 break;
  84         case POINTEDTHING_OBJECT:
  85                 object_id = readS16(is);
  86                 break;
  87         default:
  88                 throw SerializationError("unsupported PointedThingType");
  89         }
  90 }
  91
  92 bool PointedThing::operator==(const PointedThing &pt2) const
  93 {
  94         if (type != pt2.type)
  95         {
  96                 return false;
  97         }
  98         if (type == POINTEDTHING_NODE)
  99         {
 100                 if ((node_undersurface != pt2.node_undersurface)
 101                                 || (node_abovesurface != pt2.node_abovesurface)
 102                                 || (node_real_undersurface != pt2.node_real_undersurface))
 103                         return false;
 104         }
 105         else if (type == POINTEDTHING_OBJECT)
 106         {
 107                 if (object_id != pt2.object_id)
 108                         return false;
 109         }
 110         return true;
 111 }
 112
 113 bool PointedThing::operator!=(const PointedThing &pt2) const
 114 {
 115         return !(*this == pt2);
 116 }
 117