src/sky/render.h

   1 /*
   2  * Copyright (C) 2005 Liam Girdwood
   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 2 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, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #ifndef _RENDER_H
  21 #define _RENDER_H
  22
  23 #include <glib-2.0/glib.h>
  24 #include <cairo.h>
  25
  26 /* renderer magnitude bands - non planets, sun or moon */
  27 #define RENDER_MAG_BANDS        32
  28 #define RENDER_MAX_COORDS       3
  29
  30 /*
  31  * Level of sky rendering detail.
  32  */
  33 enum render_detail
  34 {
  35         RT_FAST,  /* low type, and fast */
  36         RT_FULL,  /* high quality type, slower */
  37 };
  38
  39 /*
  40  * Object render_object coordinate
  41  */
  42 struct render_coord {
  43         struct ln_equ_posn* posn;       /* object true sky position - from db */
  44         gdouble x,y,z;                  /* cairo position - from transform */
  45         gdouble object_size;            /* object size in pixels - from render_object */
  46 };
  47
  48 /*
  49  * Object render_object flags, determines what aspects of object are
  50  * rendered. Note: If type is fast then this is ignored.
  51  */
  52 struct render_flags {
  53         guint show_object;
  54         guint show_outline;
  55         guint show_phase;
  56         guint show_label;
  57         guint show_mag_flag;
  58         guint show_axis_flag;
  59         gfloat show_mag_limit;
  60         gfloat show_axis_min;
  61         gfloat show_axis_max;
  62         guint night_mode;
  63 };
  64
  65 struct render_context {
  66         gdouble faintest_magnitude;
  67         gdouble pixels_per_degree;
  68         gdouble position_angle;
  69         gdouble JD;
  70 };
  71
  72 /*
  73  * Sky rendering context
  74  */
  75 struct render_object {
  76         /* object to be rendered */
  77         gpointer object;
  78
  79         /* render_object parameters */
  80         enum render_detail type;
  81         struct render_flags flags;
  82         struct render_context context;
  83
  84         /* cairo render_object handle */
  85         cairo_t* cr;
  86
  87         /* object coordinates */
  88         struct render_coord coord[RENDER_MAX_COORDS];
  89 };
  90
  91 #endif