planarity/gameboard_draw_curtain.c

   1 /*
   2  *
   3  *  gPlanarity:
   4  *     The geeky little puzzle game with a big noodly crunch!
   5  *
   6  *     gPlanarity copyright (C) 2005 Monty <monty@xiph.org>
   7  *     Original Flash game by John Tantalo <john.tantalo@case.edu>
   8  *     Original game concept by Mary Radcliffe
   9  *
  10  *  gPlanarity is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2, or (at your option)
  13  *  any later version.
  14  *
  15  *  gPlanarity is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with Postfish; see the file COPYING.  If not, write to the
  22  *  Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  *
  25  */
  26
  27 #define _GNU_SOURCE
  28 #include <gtk/gtk.h>
  29 #include <gtk/gtkmain.h>
  30 #include <gdk/gdk.h>
  31 #include <gdk/gdkx.h>
  32 #include <stdlib.h>
  33 #include <math.h>
  34 #include <string.h>
  35
  36 #include "graph.h"
  37 #include "gameboard.h"
  38
  39 /* cache the curtain surface/pattern ******************************/
  40
  41 #define CW 4
  42 void cache_curtain(Gameboard *g){
  43   int x,y;
  44   cairo_t *c;
  45   g->curtains=
  46     cairo_surface_create_similar (cairo_get_target (g->wc),
  47                                   CAIRO_CONTENT_COLOR_ALPHA,
  48                                   CW,CW);
  49
  50   c = cairo_create(g->curtains);
  51   cairo_save(c);
  52   cairo_set_operator(c,CAIRO_OPERATOR_CLEAR);
  53   cairo_set_source_rgba (c, 1,1,1,1);
  54   cairo_paint(c);
  55   cairo_restore(c);
  56
  57   cairo_set_line_width(c,1);
  58   cairo_set_source_rgba (c, 0,0,0,.5);
  59
  60   for(y=0;y<CW;y++){
  61     for(x=y&1;x<CW;x+=2){
  62       cairo_move_to(c,x+.5,y);
  63       cairo_rel_line_to(c,0,1);
  64     }
  65   }
  66   cairo_stroke(c);
  67   cairo_destroy(c);
  68
  69   g->curtainp=cairo_pattern_create_for_surface (g->curtains);
  70   cairo_pattern_set_extend (g->curtainp, CAIRO_EXTEND_REPEAT);
  71
  72 }
  73
  74 void draw_curtain(Gameboard *g){
  75
  76   cairo_t *c = cairo_create(g->background);
  77
  78   cairo_set_source (c, g->curtainp);
  79   cairo_paint(c);
  80   cairo_destroy(c);
  81 }