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

   1 /*
   2  * Copyright (C) 2010 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         gluTessBeginPolygon(tess, NULL);
  39         for (int pi = 0; points[pi]; pi++) {
  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         }
  48         gluTessEndPolygon(tess);
  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_LINE_LOOP);
  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                 glBegin(GL_POINTS);
  63                 for (int ci = 0; points[pi][ci][0] &&
  64                                  points[pi][ci][1] &&
  65                                  points[pi][ci][2]; ci++)
  66                         glVertex3dv(points[pi][ci]);
  67                 glEnd();
  68         }
  69 }
  70 static gboolean grits_poly_genlist(gpointer _poly)
  71 {
  72         //g_debug("GritsPoly: genlist");
  73         GritsPoly *poly = GRITS_POLY(_poly);
  74         guint list = glGenLists(2);
  75         glNewList(list+0, GL_COMPILE);
  76         grits_poly_tess(poly->points);
  77         glEndList();
  78         glNewList(list+1, GL_COMPILE);
  79         grits_poly_outline(poly->points);
  80         glEndList();
  81         poly->list = list;
  82         return FALSE;
  83 }
  84
  85 static void grits_poly_draw(GritsObject *_poly, GritsOpenGL *opengl)
  86 {
  87         //g_debug("GritsPoly: draw");
  88         GritsPoly *poly = GRITS_POLY(_poly);
  89
  90         if (!poly->list)
  91                 return;
  92
  93         glPushAttrib(GL_COLOR_BUFFER_BIT | GL_ENABLE_BIT | GL_CURRENT_BIT);
  94         glDisable(GL_TEXTURE_2D);
  95         glDisable(GL_ALPHA_TEST);
  96         glDisable(GL_CULL_FACE);
  97         glDisable(GL_LIGHTING);
  98         glEnable(GL_POLYGON_OFFSET_FILL);
  99         glPolygonOffset(1, 1);
 100         if (poly->color[3]) {
 101                 glColor4dv(poly->color);
 102                 glCallList(poly->list+0);
 103         }
 104         if (poly->border[3]) {
 105                 glPointSize(poly->width);
 106                 glLineWidth(poly->width);
 107                 glColor4dv(poly->border);
 108                 glCallList(poly->list+1);
 109         }
 110         glPopAttrib();
 111 }
 112
 113 /**
 114  * grits_poly_new:
 115  * @points:  TODO
 116  * @npoints: TODO
 117  *
 118  * Create a new GritsPoly which TODO.
 119  *
 120  * Returns: the new #GritsPoly.
 121  */
 122 GritsPoly *grits_poly_new(gdouble (**points)[3])
 123 {
 124         //g_debug("GritsPoly: new - %p", points);
 125         GritsPoly *poly = g_object_new(GRITS_TYPE_POLY, NULL);
 126         poly->points    = points;
 127         g_idle_add(grits_poly_genlist, poly);
 128         return poly;
 129 }
 130
 131 GritsPoly *grits_poly_parse(const gchar *str,
 132                 const gchar *poly_sep, const gchar *point_sep, const gchar *coord_sep)
 133 {
 134         /* Split and count polygons */
 135         gchar **spolys = g_strsplit(str, poly_sep, -1);
 136         int     npolys = g_strv_length(spolys);
 137
 138         GritsBounds bounds = {-90, 90, -180, 180};
 139         gdouble (**polys)[3] = (gpointer)g_new0(double*, npolys+1);
 140         for (int pi = 0; pi < npolys; pi++) {
 141                 /* Split and count coordinates */
 142                 gchar **scoords = g_strsplit(spolys[pi], point_sep, -1);
 143                 int     ncoords = g_strv_length(scoords);
 144
 145                 /* Create binary coords */
 146                 gdouble (*coords)[3] = (gpointer)g_new0(gdouble, 3*(ncoords+1));
 147                 for (int ci = 0; ci < ncoords; ci++) {
 148                         gdouble lat, lon;
 149                         sscanf(scoords[ci], "%lf,%lf", &lat, &lon);
 150                         if (lat > bounds.n) bounds.n = lat;
 151                         if (lat < bounds.s) bounds.s = lat;
 152                         if (lon > bounds.e) bounds.e = lon;
 153                         if (lon < bounds.w) bounds.w = lon;
 154                         lle2xyz(lat, lon, 0,
 155                                         &coords[ci][0],
 156                                         &coords[ci][1],
 157                                         &coords[ci][2]);
 158                 }
 159
 160                 /* Insert coords into poly array */
 161                 polys[pi] = coords;
 162                 g_strfreev(scoords);
 163         }
 164
 165         /* Create GritsPoly */
 166         GritsPoly *poly = grits_poly_new(polys);
 167         GRITS_OBJECT(poly)->center.lat  = (bounds.n + bounds.s)/2;
 168         GRITS_OBJECT(poly)->center.lon  = lon_avg(bounds.e, bounds.w);
 169         GRITS_OBJECT(poly)->center.elev = 0;
 170         GRITS_OBJECT(poly)->skip        = GRITS_SKIP_CENTER;
 171         return poly;
 172 }
 173
 174 /* GObject code */
 175 G_DEFINE_TYPE(GritsPoly, grits_poly, GRITS_TYPE_OBJECT);
 176 static void grits_poly_init(GritsPoly *poly)
 177 {
 178         poly->border[0] = 1;
 179         poly->border[1] = 1;
 180         poly->border[2] = 1;
 181         poly->border[3] = 0.2;
 182         poly->width     = 1;
 183 }
 184
 185 static void grits_poly_finalize(GObject *_poly)
 186 {
 187         g_debug("GritsPoly: finalize");
 188         GritsPoly *poly = GRITS_POLY(_poly);
 189         (void)poly;
 190         // TODO: free points
 191 }
 192
 193 static void grits_poly_class_init(GritsPolyClass *klass)
 194 {
 195         g_debug("GritsPoly: class_init");
 196         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 197         gobject_class->finalize = grits_poly_finalize;
 198
 199         GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass);
 200         object_class->draw = grits_poly_draw;
 201 }