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         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         glDisable(GL_TEXTURE_2D);
  88         glDisable(GL_ALPHA_TEST);
  89         glDisable(GL_CULL_FACE);
  90         glDisable(GL_LIGHTING);
  91         glEnable(GL_POLYGON_OFFSET_FILL);
  92         glPolygonOffset(1, 1);
  93         if (poly->color[3]) {
  94                 glColor4dv(poly->color);
  95                 grits_poly_runlist(poly, 0, grits_poly_tess);
  96         }
  97         glLineWidth(poly->width);
  98         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
  99         if (poly->border[3]) {
 100                 glColor4dv(poly->border);
 101                 grits_poly_runlist(poly, 1, grits_poly_outline);
 102         }
 103         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 104         glPopAttrib();
 105 }
 106
 107 static void grits_poly_pick(GritsObject *_poly, GritsOpenGL *opengl)
 108 {
 109         //g_debug("GritsPoly: pick");
 110         GritsPoly *poly = GRITS_POLY(_poly);
 111         glPushAttrib(GL_ENABLE_BIT);
 112         glDisable(GL_CULL_FACE);
 113         grits_poly_runlist(poly, 0, grits_poly_tess);
 114         glPopAttrib();
 115 }
 116
 117 /**
 118  * grits_poly_new:
 119  * @points:  TODO
 120  * @npoints: TODO
 121  *
 122  * Create a new GritsPoly which TODO.
 123  *
 124  * Returns: the new #GritsPoly.
 125  */
 126 GritsPoly *grits_poly_new(gdouble (**points)[3])
 127 {
 128         //g_debug("GritsPoly: new - %p", points);
 129         GritsPoly *poly = g_object_new(GRITS_TYPE_POLY, NULL);
 130         poly->points    = points;
 131         return poly;
 132 }
 133
 134 GritsPoly *grits_poly_parse(const gchar *str,
 135                 const gchar *poly_sep, const gchar *point_sep, const gchar *coord_sep)
 136 {
 137         /* Split and count polygons */
 138         gchar **spolys = g_strsplit(str, poly_sep, -1);
 139         int     npolys = g_strv_length(spolys);
 140
 141         GritsBounds bounds = {-90, 90, -180, 180};
 142         gdouble (**polys)[3] = (gpointer)g_new0(double*, npolys+1);
 143         for (int pi = 0; pi < npolys; pi++) {
 144                 /* Split and count coordinates */
 145                 gchar **scoords = g_strsplit(spolys[pi], point_sep, -1);
 146                 int     ncoords = g_strv_length(scoords);
 147
 148                 /* Create binary coords */
 149                 gdouble (*coords)[3] = (gpointer)g_new0(gdouble, 3*(ncoords+1));
 150                 for (int ci = 0; ci < ncoords; ci++) {
 151                         gdouble lat, lon;
 152                         sscanf(scoords[ci], "%lf,%lf", &lat, &lon);
 153                         if (lat > bounds.n) bounds.n = lat;
 154                         if (lat < bounds.s) bounds.s = lat;
 155                         if (lon > bounds.e) bounds.e = lon;
 156                         if (lon < bounds.w) bounds.w = lon;
 157                         lle2xyz(lat, lon, 0,
 158                                         &coords[ci][0],
 159                                         &coords[ci][1],
 160                                         &coords[ci][2]);
 161                 }
 162
 163                 /* Insert coords into poly array */
 164                 polys[pi] = coords;
 165                 g_strfreev(scoords);
 166         }
 167
 168         /* Create GritsPoly */
 169         GritsPoly *poly = grits_poly_new(polys);
 170         GRITS_OBJECT(poly)->center.lat  = (bounds.n + bounds.s)/2;
 171         GRITS_OBJECT(poly)->center.lon  = lon_avg(bounds.e, bounds.w);
 172         GRITS_OBJECT(poly)->center.elev = 0;
 173         GRITS_OBJECT(poly)->skip        = GRITS_SKIP_CENTER;
 174         return poly;
 175 }
 176
 177 /* GObject code */
 178 G_DEFINE_TYPE(GritsPoly, grits_poly, GRITS_TYPE_OBJECT);
 179 static void grits_poly_init(GritsPoly *poly)
 180 {
 181         poly->border[0] = 1;
 182         poly->border[1] = 1;
 183         poly->border[2] = 1;
 184         poly->border[3] = 0.2;
 185         poly->width     = 1;
 186         GRITS_OBJECT(poly)->skip = GRITS_SKIP_STATE;
 187 }
 188
 189 static void grits_poly_finalize(GObject *_poly)
 190 {
 191         g_debug("GritsPoly: finalize");
 192         GritsPoly *poly = GRITS_POLY(_poly);
 193         (void)poly;
 194         // TODO: free points
 195 }
 196
 197 static void grits_poly_class_init(GritsPolyClass *klass)
 198 {
 199         g_debug("GritsPoly: class_init");
 200         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 201         gobject_class->finalize = grits_poly_finalize;
 202
 203         GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass);
 204         object_class->draw = grits_poly_draw;
 205         object_class->pick = grits_poly_pick;
 206 }