X-Git-Url: http://pileus.org/git/?p=grits;a=blobdiff_plain;f=src%2Fobjects%2Fgrits-volume.c;fp=src%2Fobjects%2Fgrits-volume.c;h=be08279be35c075d66be6f282d7548af7ed55a8d;hp=0000000000000000000000000000000000000000;hb=aae93be6e35c5c760d87f08e7993194adf1f6e44;hpb=ae7b2d9e5f5bae86f1d50ee68c8dee109a66ed5f diff --git a/src/objects/grits-volume.c b/src/objects/grits-volume.c new file mode 100644 index 0000000..be08279 --- /dev/null +++ b/src/objects/grits-volume.c @@ -0,0 +1,175 @@ +/* + * Copyright (C) 2009-2010 Andy Spencer + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +/** + * SECTION:grits-volume + * @short_description: 3-D gridded vovlume + * + * Each #GritsVolume consistes of a 3-dimentional grid of data points each + * consisting of a value. + * + * Currently iso-surfaces are extracted and displayed when rendering the volume + * data. + */ + +#include +#include +#include +#include +#include +#include "grits-volume.h" + +/* Drawing */ +static void draw_points(VolGrid *grid, gdouble level) +{ + glPointSize(200./grid->xs); + glBegin(GL_POINTS); + for (int x = 0; x < grid->xs; x++) + for (int y = 0; y < grid->ys; y++) + for (int z = 0; z < grid->zs; z++) { + VolPoint *pt = vol_grid_get(grid, x, y, z); + if (pt->value < level) + continue; + + g_debug("(%d,%d,%d) value=%f", x, y, z, pt->value); + + glColor4f(1.0, 1.0, 1.0, pt->value/100); + glVertex3dv((double*)&pt->c); + } + glEnd(); +} + +static void draw_iso(GList *tris) +{ + g_debug("GritsVolume: draw_iso"); + glDisable(GL_CULL_FACE); + glBegin(GL_TRIANGLES); + for (GList *cur = tris; cur; cur = cur->next) { + VolTriangle *tri = cur->data; + VolCoord c[3] = {tri->v[0]->c, tri->v[1]->c, tri->v[2]->c }; + VolCoord n[3] = {tri->v[0]->norm, tri->v[1]->norm, tri->v[2]->norm}; + + /* Normalize normal vector */ + for (int i = 0; i < 3; i++) { + double total = sqrt( + n[i].x * n[i].x + + n[i].y * n[i].y + + n[i].z * n[i].z); + if (total == 0) + continue; // wtf + n[i].x = n[i].x / total; + n[i].y = n[i].y / total; + n[i].z = n[i].z / total; + } + + //for (int i = 0; i < 3; i++) + // g_debug("norm=%f,%f,%f", + // n[i].x, n[i].y, n[i].z); + //glNormal3dv((double*)&tri->norm); + glNormal3dv((double*)&n[0]); glVertex3dv((double*)&c[0]); + glNormal3dv((double*)&n[1]); glVertex3dv((double*)&c[1]); + glNormal3dv((double*)&n[2]); glVertex3dv((double*)&c[2]); + } + glEnd(); +} + +static void draw(GritsObject *_volume, GritsOpenGL *opengl) +{ + g_debug("GritsVolume: draw"); + GritsVolume *volume = GRITS_VOLUME(_volume); + + gfloat amb[4] = {}; + gfloat dif[4] = {}; + switch (volume->disp) { + case GRITS_VOLUME_SURFACE: + glDisable(GL_COLOR_MATERIAL); + amb[0] = (double)volume->color[0] / 0xff; + amb[1] = (double)volume->color[1] / 0xff; + amb[2] = (double)volume->color[2] / 0xff; + amb[3] = 1; + dif[0] = (double)volume->color[0] / 0xff; + dif[1] = (double)volume->color[1] / 0xff; + dif[2] = (double)volume->color[2] / 0xff; + dif[3] = 1; + glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, amb); + glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, dif); + draw_iso(volume->tris); + break; + case GRITS_VOLUME_POINTS: + draw_points(volume->grid, volume->level); + break; + } +} + +/* Idle update */ +gboolean update_iso(gpointer _volume) +{ + GritsVolume *volume = _volume; + if (volume->tris) { + g_list_foreach(volume->tris, (GFunc)vol_triangle_free, NULL); + g_list_free(volume->tris); + } + volume->tris = marching_cubes(volume->grid, volume->level); + volume->update_id = 0; + grits_object_queue_draw(GRITS_OBJECT(volume)); + return FALSE; +} + +/*********** + * Methods * + ***********/ +void grits_volume_set_level(GritsVolume *volume, gdouble level) +{ + volume->level = level; + if (!volume->update_id) + volume->update_id = g_idle_add(update_iso, volume); +} + +GritsVolume *grits_volume_new(VolGrid *grid) +{ + g_debug("GritsVolume: new - %p[%d][%d][%d]", + grid, grid->xs, grid->ys, grid->zs); + GritsVolume *volume = g_object_new(GRITS_TYPE_VOLUME, NULL); + volume->grid = grid; + return volume; +} + +/* GObject code */ +G_DEFINE_TYPE(GritsVolume, grits_volume, GRITS_TYPE_OBJECT); +static void grits_volume_init(GritsVolume *volume) +{ +} + +static void grits_volume_finalize(GObject *_volume) +{ + GritsVolume *volume = GRITS_VOLUME(_volume); + volume->color[0] = 1; + volume->color[1] = 1; + volume->color[2] = 1; + volume->color[3] = 1; + //g_debug("GritsVolume: finalize - %s", volume->label); +} + +static void grits_volume_class_init(GritsVolumeClass *klass) +{ + g_debug("GritsVolume: class_init"); + GObjectClass *gobject_class = G_OBJECT_CLASS(klass); + gobject_class->finalize = grits_volume_finalize; + + GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass); + object_class->draw = draw; +}