source/libr2c2/terrain.cpp

   1 #include <cmath>
   2 #include <msp/geometry/box.h>
   3 #include <msp/geometry/transformedshape.h>
   4 #include "layout.h"
   5 #include "terrain.h"
   6 #include "terraintype.h"
   7
   8 using namespace std;
   9 using namespace Msp;
  10
  11 namespace R2C2 {
  12
  13 Terrain::Terrain(Layout &l, const TerrainType &t):
  14         Object(l),
  15         type(t),
  16         width(0),
  17         height(0)
  18 {
  19         set_size(1, 1);
  20
  21         layout.add(*this);
  22 }
  23
  24 Terrain::~Terrain()
  25 {
  26         layout.remove(*this);
  27 }
  28
  29 Terrain *Terrain::clone(Layout *to_layout) const
  30 {
  31         Terrain *terrain = new Terrain((to_layout ? *to_layout : layout), type);
  32         terrain->set_size(width, height);
  33         for(unsigned i=0; i<tiles.size(); ++i)
  34                 terrain->tiles[i] = tiles[i];
  35         return terrain;
  36 }
  37
  38 void Terrain::set_position(const Vector &p)
  39 {
  40         position = p;
  41         signal_moved.emit();
  42 }
  43
  44 void Terrain::set_rotation(const Angle &r)
  45 {
  46         rotation = r;
  47         signal_moved.emit();
  48 }
  49
  50 void Terrain::set_size(unsigned w, unsigned h)
  51 {
  52         if(!w || !h)
  53                 throw invalid_argument("Terrain::set_size");
  54
  55         vector<Tile> new_tiles(w*h);
  56         for(unsigned y=0; (y<h && y<height); ++y)
  57                 for(unsigned x=0; (x<w && x<width); ++x)
  58                         new_tiles[x+y*w] = tiles[x+y*width];
  59
  60         width = w;
  61         height = h;
  62         swap(tiles, new_tiles);
  63
  64         delete shape;
  65         float ts = type.get_tile_size();
  66         Vector dim(width*ts, height*ts, ts/10.0f);
  67         shape = new Geometry::TransformedShape<float, 3>(
  68                 Geometry::Box<float>(dim),
  69                 Transform::translation(dim/2.0f));
  70
  71         signal_size_changed.emit(width, height);
  72 }
  73
  74 const Terrain::Tile &Terrain::get_tile(unsigned x, unsigned y) const
  75 {
  76         if(x>=width || y>=height)
  77                 throw out_of_range("Terrain::get_tile");
  78         return tiles[x+y*width];
  79 }
  80
  81 void Terrain::set_node_elevation(const NodeCoordinates &c, float elev, bool joined)
  82 {
  83         if(c.x>=width || c.y>=height || c.i>=4)
  84                 throw out_of_range("Terrain::set_node_elevation");
  85
  86         float eg = type.get_elevation_granularity();
  87         elev = floor(elev/eg+0.5)*eg;
  88
  89         if(joined)
  90         {
  91                 float ref = tiles[c.x+c.y*width].nodes[c.i].elevation;
  92                 for(unsigned i=0; i<4; ++i)
  93                 {
  94                         unsigned x = c.x+c.i%2-i%2;
  95                         unsigned y = c.y+c.i/2-i/2;
  96                         if(x<width && y<height)
  97                         {
  98                                 Tile &tile = tiles[x+y*width];
  99                                 if(tile.nodes[i].elevation==ref)
 100                                 {
 101                                         tile.set_node_elevation(i, elev);
 102                                         signal_tile_changed.emit(x, y);
 103                                 }
 104                         }
 105                 }
 106         }
 107         else
 108         {
 109                 tiles[c.x+c.y*width].set_node_elevation(c.i, elev);
 110                 signal_tile_changed.emit(c.x, c.y);
 111         }
 112 }
 113
 114 float Terrain::get_node_elevation(const NodeCoordinates &c) const
 115 {
 116         if(c.x>=width || c.y>=height || c.i>=4)
 117                 throw out_of_range("Terrain::get_node_elevation");
 118
 119         return tiles[c.x+c.y*width].nodes[c.i].elevation;
 120 }
 121
 122 Vector Terrain::get_node_position(const NodeCoordinates &c) const
 123 {
 124         if(c.x>=width || c.y>=height || c.i>=4)
 125                 throw out_of_range("Terrain::get_node_position");
 126
 127         const Tile &tile = tiles[c.x+c.y*width];
 128         float tile_size = type.get_tile_size();
 129         Transform trans = Transform::translation(position)*
 130                 Transform::rotation(rotation, Vector(0, 0, 1));
 131         return trans.transform(Vector((c.x+c.i%2)*tile_size, (c.y+c.i/2)*tile_size, tile.nodes[c.i].elevation));
 132 }
 133
 134 Terrain::NodeCoordinates Terrain::get_closest_node(const Ray &ray) const
 135 {
 136         Transform reverse_trans = Transform::rotation(rotation, Vector(0, 0, -1))*
 137                 Transform::translation(-position);
 138         Ray local_ray = reverse_trans.transform(ray);
 139
 140         float ts = type.get_tile_size();
 141         NodeCoordinates coords;
 142         float closest_dist = -1;
 143         for(unsigned y=0; y<height; ++y)
 144                 for(unsigned x=0; x<width; ++x)
 145                         for(unsigned i=0; i<4; ++i)
 146                         {
 147                                 NodeCoordinates c(x, y, i);
 148                                 Vector node_pos((x+0.25+(i%2)*0.5)*ts, (y+0.25+(i/2)*0.5)*ts, get_node_elevation(c));
 149                                 Vector v = node_pos-local_ray.get_start();
 150                                 float dist = (v-local_ray.get_direction()*dot(local_ray.get_direction(), v)).norm();
 151                                 if(closest_dist<0 || dist<closest_dist)
 152                                 {
 153                                         coords = c;
 154                                         closest_dist = dist;
 155                                 }
 156                         }
 157
 158         return coords;
 159 }
 160
 161 void Terrain::save(list<DataFile::Statement> &st) const
 162 {
 163         st.push_back((DataFile::Statement("position"), position.x, position.y, position.z));
 164         st.push_back((DataFile::Statement("rotation"), rotation.radians()));
 165         st.push_back((DataFile::Statement("size"), width, height));
 166         for(vector<Tile>::const_iterator i=tiles.begin(); i!=tiles.end(); ++i)
 167         {
 168                 DataFile::Statement ss("tile");
 169                 i->save(ss.sub);
 170                 st.push_back(ss);
 171         }
 172 }
 173
 174
 175 Terrain::Node::Node():
 176         elevation(0),
 177         ground(0),
 178         wall(0)
 179 { }
 180
 181 void Terrain::Node::save(list<DataFile::Statement> &st) const
 182 {
 183         st.push_back((DataFile::Statement("elevation"), elevation));
 184         st.push_back((DataFile::Statement("ground"), ground));
 185 }
 186
 187
 188 Terrain::Tile::Tile():
 189         secondary_axis(false)
 190 { }
 191
 192 void Terrain::Tile::set_node_elevation(unsigned i, float e)
 193 {
 194         nodes[i].elevation = e;
 195         update_axis();
 196 }
 197
 198 void Terrain::Tile::update_axis()
 199 {
 200         secondary_axis = (abs(nodes[1].elevation-nodes[2].elevation) < abs(nodes[0].elevation-nodes[3].elevation));
 201 }
 202
 203 void Terrain::Tile::save(list<DataFile::Statement> &st) const
 204 {
 205         float elevation_mode = find_mode(&Node::elevation);
 206         unsigned ground_mode = find_mode(&Node::ground);
 207         if(elevation_mode)
 208                 st.push_back((DataFile::Statement("elevation"), elevation_mode));
 209         if(ground_mode)
 210                 st.push_back((DataFile::Statement("ground"), ground_mode));
 211
 212         for(unsigned i=0; i<4; ++i)
 213         {
 214                 if(nodes[i].elevation==elevation_mode && nodes[i].ground==ground_mode)
 215                         continue;
 216
 217                 DataFile::Statement ss("node");
 218                 ss.append(i);
 219                 if(nodes[i].elevation!=elevation_mode)
 220                         ss.sub.push_back((DataFile::Statement("elevation"), nodes[i].elevation));
 221                 if(nodes[i].ground!=ground_mode)
 222                         ss.sub.push_back((DataFile::Statement("ground"), nodes[i].ground));
 223                 st.push_back(ss);
 224         }
 225 }
 226
 227 template<typename T>
 228 T Terrain::Tile::find_mode(T Node::*member) const
 229 {
 230         for(unsigned i=0; i<3; ++i)
 231                 for(unsigned j=i+1; j<4; ++j)
 232                         if(nodes[i].*member==nodes[j].*member)
 233                                 return nodes[i].*member;
 234         return T();
 235 }
 236
 237
 238 Terrain::NodeCoordinates::NodeCoordinates():
 239         x(0),
 240         y(0),
 241         i(0)
 242 { }
 243
 244 Terrain::NodeCoordinates::NodeCoordinates(unsigned x_, unsigned y_, unsigned i_):
 245         x(x_),
 246         y(y_),
 247         i(i_)
 248 { }
 249
 250
 251 Terrain::Loader::Loader(Terrain &t):
 252         DataFile::ObjectLoader<Terrain>(t),
 253         next_tile(0)
 254 {
 255         add("position", &Loader::position);
 256         add("rotation", &Loader::rotation);
 257         add("size", &Loader::size);
 258         add("tile", &Loader::tile);
 259         add("tile", &Loader::tile_coords);
 260 }
 261
 262 void Terrain::Loader::position(float x, float y, float z)
 263 {
 264         obj.set_position(Vector(x, y, z));
 265 }
 266
 267 void Terrain::Loader::rotation(float a)
 268 {
 269         obj.set_rotation(Angle::from_radians(a));
 270 }
 271
 272 void Terrain::Loader::size(unsigned w, unsigned h)
 273 {
 274         obj.set_size(w, h);
 275 }
 276
 277 void Terrain::Loader::tile()
 278 {
 279         if(next_tile>=obj.tiles.size())
 280                 throw runtime_error("Terrain::Loader::tile");
 281
 282         Tile &t = obj.tiles[next_tile];
 283         Tile::Loader ldr(obj, t);
 284         load_sub_with(ldr);
 285         t.update_axis();
 286         unsigned x = next_tile%obj.width;
 287         unsigned y = next_tile/obj.width;
 288         ++next_tile;
 289         obj.signal_tile_changed.emit(x, y);
 290 }
 291
 292 void Terrain::Loader::tile_coords(unsigned x, unsigned y)
 293 {
 294         if(x>=obj.width || y>=obj.height)
 295                 throw out_of_range("Terrain::Loader::tile");
 296         next_tile = x+y*obj.width;
 297         tile();
 298 }
 299
 300
 301 Terrain::Node::Loader::Loader(Terrain &t, Node &n):
 302         DataFile::ObjectLoader<Node>(n),
 303         terrain(t)
 304 {
 305         add("ground", &Loader::ground);
 306         add("elevation", &Node::elevation);
 307 }
 308
 309 void Terrain::Node::Loader::ground(unsigned g)
 310 {
 311         if(g>=terrain.type.get_n_surface_types())
 312                 throw out_of_range("Tile::Loader::surface");
 313         obj.ground = g;
 314 }
 315
 316
 317 Terrain::Tile::Loader::Loader(Terrain &t, Tile &l):
 318         DataFile::ObjectLoader<Tile>(l),
 319         terrain(t)
 320 {
 321         add("ground", &Loader::ground);
 322         add("elevation", &Loader::elevation);
 323         add("node", &Loader::node);
 324 }
 325
 326 void Terrain::Tile::Loader::ground(unsigned g)
 327 {
 328         if(g>=terrain.type.get_n_surface_types())
 329                 throw out_of_range("Tile::Loader::surface");
 330         for(unsigned i=0; i<4; ++i)
 331                 obj.nodes[i].ground = g;
 332 }
 333
 334 void Terrain::Tile::Loader::elevation(float h)
 335 {
 336         for(unsigned i=0; i<4; ++i)
 337                 obj.nodes[i].elevation = h;
 338 }
 339
 340 void Terrain::Tile::Loader::node(unsigned i)
 341 {
 342         if(i>=4)
 343                 throw out_of_range("Tile::Loader::node");
 344         Node::Loader ldr(terrain, obj.nodes[i]);
 345         load_sub_with(ldr);
 346 }
 347
 348 } // namespace R2C2