Pileus Git - grits/blob - src/objects/grits-poly.c

   1 /*
   2  * Copyright (C) 2010-2011 Andy Spencer <andy753421@gmail.com>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /**
  19  * SECTION:grits-poly
  20  * @short_description: Single point polys
  21  *
  22  * Each #GritsPoly represents a 3 dimentional polygon.
  23  */
  24
  25 #include <config.h>
  26 #include <GL/gl.h>
  27 #include <GL/glu.h>
  28 #include "grits-poly.h"
  29
  30 /* Drawing */
  31 static void grits_poly_tess(gdouble (**points)[3])
  32 {
  33         //g_debug("GritsPoly: tess");
  34         GLUtesselator *tess = gluNewTess();
  35         gluTessCallback(tess, GLU_TESS_BEGIN,  (_GLUfuncptr)glBegin);
  36         gluTessCallback(tess, GLU_TESS_VERTEX, (_GLUfuncptr)glVertex3dv);
  37         gluTessCallback(tess, GLU_TESS_END,    (_GLUfuncptr)glEnd);
  38         for (int pi = 0; points[pi]; pi++) {
  39                 gluTessBeginPolygon(tess, NULL);
  40                 gluTessBeginContour(tess);
  41                 for (int ci = 0; points[pi][ci][0]; ci++) {
  42                         gluTessVertex(tess,
  43                                 points[pi][ci],
  44                                 points[pi][ci]);
  45                 }
  46                 gluTessEndContour(tess);
  47                 gluTessEndPolygon(tess);
  48         }
  49         gluDeleteTess(tess);
  50 }
  51
  52 static void grits_poly_outline(gdouble (**points)[3])
  53 {
  54         //g_debug("GritsPoly: outline");
  55         for (int pi = 0; points[pi]; pi++) {
  56                 glBegin(GL_POLYGON);
  57                 for (int ci = 0; points[pi][ci][0] &&
  58                                  points[pi][ci][1] &&
  59                                  points[pi][ci][2]; ci++)
  60                         glVertex3dv(points[pi][ci]);
  61                 glEnd();
  62         }
  63 }
  64
  65 static gboolean grits_poly_runlist(GritsPoly *poly, int i,
  66                 void (*render)(gdouble(**)[3]))
  67 {
  68         //g_debug("GritsPoly: genlist");
  69         if (poly->list[i]) {
  70                 glCallList(poly->list[i]);
  71         } else {
  72                 guint list = glGenLists(1);
  73                 glNewList(list, GL_COMPILE_AND_EXECUTE);
  74                 render(poly->points);
  75                 glEndList();
  76                 poly->list[i] = list;
  77         }
  78         return FALSE;
  79 }
  80
  81 static void grits_poly_draw(GritsObject *_poly, GritsOpenGL *opengl)
  82 {
  83         //g_debug("GritsPoly: draw");
  84         GritsPoly *poly = GRITS_POLY(_poly);
  85
  86         glPushAttrib(GL_COLOR_BUFFER_BIT | GL_ENABLE_BIT | GL_CURRENT_BIT |
  87                         GL_POINT_BIT | GL_LINE_BIT | GL_POLYGON_BIT);
  88         glDisable(GL_TEXTURE_2D);
  89         glDisable(GL_ALPHA_TEST);
  90         glDisable(GL_CULL_FACE);
  91         glDisable(GL_LIGHTING);
  92
  93         glEnable(GL_POLYGON_OFFSET_FILL);
  94         glEnable(GL_POLYGON_OFFSET_LINE);
  95         glEnable(GL_POLYGON_OFFSET_POINT);
  96
  97         if (poly->color[3]) {
  98                 /* Draw background farthest back */
  99                 glPolygonOffset(3, 3);
 100                 glColor4dv(poly->color);
 101                 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 102                 grits_poly_runlist(poly, 0, grits_poly_tess);
 103         }
 104
 105         glEnable(GL_POLYGON_SMOOTH);
 106         glEnable(GL_LINE_SMOOTH);
 107         glEnable(GL_POINT_SMOOTH);
 108
 109         if (!poly->color[3] && poly->border[3] && poly->width > 1) {
 110                 /* Draw line border in the middle */
 111                 glColor4d(0,0,0,1);
 112
 113                 glPointSize(poly->width*2);
 114                 glLineWidth(poly->width*2);
 115
 116                 glPolygonOffset(2, 2);
 117
 118                 glPolygonMode(GL_FRONT_AND_BACK, GL_POINT);
 119                 grits_poly_runlist(poly, 1, grits_poly_outline);
 120                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 121                 grits_poly_runlist(poly, 1, grits_poly_outline);
 122         }
 123
 124         if (poly->border[3]) {
 125                 /* Draw border front-most */
 126                 glColor4dv(poly->border);
 127
 128                 glPointSize(poly->width);
 129                 glLineWidth(poly->width);
 130
 131                 glPolygonOffset(1, 1);
 132                 if (poly->width > 1) {
 133                         glPolygonMode(GL_FRONT_AND_BACK, GL_POINT);
 134                         grits_poly_runlist(poly, 1, grits_poly_outline);
 135                 }
 136                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 137                 grits_poly_runlist(poly, 1, grits_poly_outline);
 138         }
 139
 140         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 141         glPopAttrib();
 142 }
 143
 144 static void grits_poly_pick(GritsObject *_poly, GritsOpenGL *opengl)
 145 {
 146         //g_debug("GritsPoly: pick");
 147         GritsPoly *poly = GRITS_POLY(_poly);
 148         glPushAttrib(GL_ENABLE_BIT);
 149         glDisable(GL_CULL_FACE);
 150         grits_poly_runlist(poly, 0, grits_poly_tess);
 151         glPopAttrib();
 152 }
 153
 154 static gboolean grits_poly_delete(gpointer list)
 155 {
 156         glDeleteLists((guint)list, 1);
 157         return FALSE;
 158 }
 159
 160 /**
 161  * grits_poly_new:
 162  * @points:  TODO
 163  * @npoints: TODO
 164  *
 165  * Create a new GritsPoly which TODO.
 166  *
 167  * Returns: the new #GritsPoly.
 168  */
 169 GritsPoly *grits_poly_new(gdouble (**points)[3])
 170 {
 171         //g_debug("GritsPoly: new - %p", points);
 172         GritsPoly *poly = g_object_new(GRITS_TYPE_POLY, NULL);
 173         poly->points    = points;
 174         return poly;
 175 }
 176
 177 static void _free_points(gdouble (**points)[3])
 178 {
 179         for (int i = 0; points[i]; i++)
 180                 g_free(points[i]);
 181         g_free(points);
 182 }
 183
 184 GritsPoly *grits_poly_parse(const gchar *str,
 185                 const gchar *poly_sep, const gchar *point_sep, const gchar *coord_sep)
 186 {
 187         /* Split and count polygons */
 188         gchar **spolys = g_strsplit(str, poly_sep, -1);
 189         int     npolys = g_strv_length(spolys);
 190
 191         GritsBounds bounds = {-90, 90, -180, 180};
 192         gdouble (**polys)[3] = (gpointer)g_new0(double*, npolys+1);
 193         for (int pi = 0; pi < npolys; pi++) {
 194                 /* Split and count coordinates */
 195                 gchar **scoords = g_strsplit(spolys[pi], point_sep, -1);
 196                 int     ncoords = g_strv_length(scoords);
 197
 198                 /* Create binary coords */
 199                 gdouble (*coords)[3] = (gpointer)g_new0(gdouble, 3*(ncoords+1));
 200                 for (int ci = 0; ci < ncoords; ci++) {
 201                         gdouble lat, lon;
 202                         sscanf(scoords[ci], "%lf,%lf", &lat, &lon);
 203                         if (lat > bounds.n) bounds.n = lat;
 204                         if (lat < bounds.s) bounds.s = lat;
 205                         if (lon > bounds.e) bounds.e = lon;
 206                         if (lon < bounds.w) bounds.w = lon;
 207                         lle2xyz(lat, lon, 0,
 208                                         &coords[ci][0],
 209                                         &coords[ci][1],
 210                                         &coords[ci][2]);
 211                 }
 212
 213                 /* Insert coords into poly array */
 214                 polys[pi] = coords;
 215                 g_strfreev(scoords);
 216         }
 217         g_strfreev(spolys);
 218
 219         /* Create GritsPoly */
 220         GritsPoly *poly = grits_poly_new(polys);
 221         GRITS_OBJECT(poly)->center.lat  = (bounds.n + bounds.s)/2;
 222         GRITS_OBJECT(poly)->center.lon  = lon_avg(bounds.e, bounds.w);
 223         GRITS_OBJECT(poly)->center.elev = 0;
 224         GRITS_OBJECT(poly)->skip        = GRITS_SKIP_CENTER;
 225         g_object_weak_ref(G_OBJECT(poly), (GWeakNotify)_free_points, polys);
 226         return poly;
 227 }
 228
 229 /* GObject code */
 230 G_DEFINE_TYPE(GritsPoly, grits_poly, GRITS_TYPE_OBJECT);
 231 static void grits_poly_init(GritsPoly *poly)
 232 {
 233         poly->border[0] = 1;
 234         poly->border[1] = 1;
 235         poly->border[2] = 1;
 236         poly->border[3] = 0.2;
 237         poly->width     = 1;
 238         GRITS_OBJECT(poly)->skip = GRITS_SKIP_STATE;
 239 }
 240
 241 static void grits_poly_finalize(GObject *_poly)
 242 {
 243         //g_debug("GritsPoly: finalize");
 244         GritsPoly *poly = GRITS_POLY(_poly);
 245         if (poly->list[0]) g_idle_add(grits_poly_delete, (gpointer)poly->list[0]);
 246         if (poly->list[1]) g_idle_add(grits_poly_delete, (gpointer)poly->list[1]);
 247 }
 248
 249 static void grits_poly_class_init(GritsPolyClass *klass)
 250 {
 251         g_debug("GritsPoly: class_init");
 252         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 253         gobject_class->finalize = grits_poly_finalize;
 254
 255         GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass);
 256         object_class->draw = grits_poly_draw;
 257         object_class->pick = grits_poly_pick;
 258 }