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 static void grits_poly_pick(GritsObject *_poly, GritsOpenGL *opengl)
 114 {
 115         //g_debug("GritsPoly: pick");
 116         GritsPoly *poly = GRITS_POLY(_poly);
 117         if (!poly->list)
 118                 return;
 119         glPushAttrib(GL_ENABLE_BIT);
 120         glDisable(GL_CULL_FACE);
 121         glCallList(poly->list+0);
 122         glPopAttrib();
 123 }
 124
 125 /**
 126  * grits_poly_new:
 127  * @points:  TODO
 128  * @npoints: TODO
 129  *
 130  * Create a new GritsPoly which TODO.
 131  *
 132  * Returns: the new #GritsPoly.
 133  */
 134 GritsPoly *grits_poly_new(gdouble (**points)[3])
 135 {
 136         //g_debug("GritsPoly: new - %p", points);
 137         GritsPoly *poly = g_object_new(GRITS_TYPE_POLY, NULL);
 138         poly->points    = points;
 139         g_idle_add(grits_poly_genlist, poly);
 140         return poly;
 141 }
 142
 143 GritsPoly *grits_poly_parse(const gchar *str,
 144                 const gchar *poly_sep, const gchar *point_sep, const gchar *coord_sep)
 145 {
 146         /* Split and count polygons */
 147         gchar **spolys = g_strsplit(str, poly_sep, -1);
 148         int     npolys = g_strv_length(spolys);
 149
 150         GritsBounds bounds = {-90, 90, -180, 180};
 151         gdouble (**polys)[3] = (gpointer)g_new0(double*, npolys+1);
 152         for (int pi = 0; pi < npolys; pi++) {
 153                 /* Split and count coordinates */
 154                 gchar **scoords = g_strsplit(spolys[pi], point_sep, -1);
 155                 int     ncoords = g_strv_length(scoords);
 156
 157                 /* Create binary coords */
 158                 gdouble (*coords)[3] = (gpointer)g_new0(gdouble, 3*(ncoords+1));
 159                 for (int ci = 0; ci < ncoords; ci++) {
 160                         gdouble lat, lon;
 161                         sscanf(scoords[ci], "%lf,%lf", &lat, &lon);
 162                         if (lat > bounds.n) bounds.n = lat;
 163                         if (lat < bounds.s) bounds.s = lat;
 164                         if (lon > bounds.e) bounds.e = lon;
 165                         if (lon < bounds.w) bounds.w = lon;
 166                         lle2xyz(lat, lon, 0,
 167                                         &coords[ci][0],
 168                                         &coords[ci][1],
 169                                         &coords[ci][2]);
 170                 }
 171
 172                 /* Insert coords into poly array */
 173                 polys[pi] = coords;
 174                 g_strfreev(scoords);
 175         }
 176
 177         /* Create GritsPoly */
 178         GritsPoly *poly = grits_poly_new(polys);
 179         GRITS_OBJECT(poly)->center.lat  = (bounds.n + bounds.s)/2;
 180         GRITS_OBJECT(poly)->center.lon  = lon_avg(bounds.e, bounds.w);
 181         GRITS_OBJECT(poly)->center.elev = 0;
 182         GRITS_OBJECT(poly)->skip        = GRITS_SKIP_CENTER;
 183         return poly;
 184 }
 185
 186 /* GObject code */
 187 G_DEFINE_TYPE(GritsPoly, grits_poly, GRITS_TYPE_OBJECT);
 188 static void grits_poly_init(GritsPoly *poly)
 189 {
 190         poly->border[0] = 1;
 191         poly->border[1] = 1;
 192         poly->border[2] = 1;
 193         poly->border[3] = 0.2;
 194         poly->width     = 1;
 195 }
 196
 197 static void grits_poly_finalize(GObject *_poly)
 198 {
 199         g_debug("GritsPoly: finalize");
 200         GritsPoly *poly = GRITS_POLY(_poly);
 201         (void)poly;
 202         // TODO: free points
 203 }
 204
 205 static void grits_poly_class_init(GritsPolyClass *klass)
 206 {
 207         g_debug("GritsPoly: class_init");
 208         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 209         gobject_class->finalize = grits_poly_finalize;
 210
 211         GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass);
 212         object_class->draw = grits_poly_draw;
 213         object_class->pick = grits_poly_pick;
 214 }