app/paginate_gnomeprint.c

   1 /* Dia -- an diagram creation/manipulation program
   2  * Copyright (C) 1998, 1999 Alexander Larsson
   3  *
   4  * paginate_gnomeprint.[ch] -- pagination code for the gnome-print backend
   5  * Copyright (C) 1999 James Henstridge
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include "diagram.h"
  27 #include "diagramdata.h"
  28 #include "libgnome/libgnome.h"
  29 #include "paginate_gnomeprint.h"
  30 #include "message.h"
  31
  32 #include <gnome.h>
  33 #include <libgnomeprint/gnome-printer-dialog.h>
  34
  35 static void
  36 count_objs(Object *obj, Renderer *renderer, int active_layer, guint *nobjs)
  37 {
  38   (*nobjs)++;
  39 }
  40
  41
  42 static guint
  43 print_page(DiagramData *data, RendererGPrint *rend, Rectangle *bounds,
  44            gint xpos, gint ypos)
  45 {
  46   guint nobjs = 0;
  47   gdouble tmargin = data->paper.tmargin, bmargin = data->paper.bmargin;
  48   gdouble lmargin = data->paper.lmargin;
  49 #ifdef THIS_IS_PROBABLY_DEAD_CODE
  50   gdouble rmargin = data->paper.rmargin;
  51 #endif
  52   gdouble scale = data->paper.scaling;
  53   char buf[256];
  54
  55   /* count the number of objects in this region */
  56   data_render(data, (Renderer *)rend, bounds,
  57               (ObjectRenderer) count_objs, &nobjs);
  58
  59   if (nobjs == 0)
  60     return nobjs;
  61
  62   /* give a name to this page */
  63   g_snprintf(buf, sizeof(buf), "%d,%d", xpos, ypos);
  64   gnome_print_beginpage(rend->ctx, buf);
  65
  66   /* save print context */
  67   gnome_print_gsave(rend->ctx);
  68
  69   /* transform coordinate system */
  70   if (data->paper.is_portrait) {
  71     gnome_print_scale(rend->ctx, 28.346457 * scale, -28.346457 * scale);
  72     gnome_print_translate(rend->ctx, lmargin/scale - bounds->left,
  73                           -bmargin/scale - bounds->bottom);
  74   } else {
  75     gnome_print_rotate(rend->ctx, 90);
  76     gnome_print_scale(rend->ctx, 28.346457 * scale, -28.346457 * scale);
  77     gnome_print_translate(rend->ctx, lmargin/scale - bounds->left,
  78                           tmargin/scale - bounds->top);
  79   }
  80
  81   /* set up clip mask */
  82   gnome_print_newpath(rend->ctx);
  83   gnome_print_moveto(rend->ctx, bounds->left, bounds->top);
  84   gnome_print_lineto(rend->ctx, bounds->right, bounds->top);
  85   gnome_print_lineto(rend->ctx, bounds->right, bounds->bottom);
  86   gnome_print_lineto(rend->ctx, bounds->left, bounds->bottom);
  87   gnome_print_lineto(rend->ctx, bounds->left, bounds->top);
  88   gnome_print_clip(rend->ctx);
  89
  90   /* render the region */
  91   data_render(data, (Renderer *)rend, bounds, NULL, NULL);
  92
  93   /* restore print context */
  94   gnome_print_grestore(rend->ctx);
  95
  96   /* print the page */
  97   gnome_print_showpage(rend->ctx);
  98
  99   return nobjs;
 100 }
 101
 102 void
 103 paginate_gnomeprint(Diagram *dia, GnomePrintContext *ctx)
 104 {
 105   RendererGPrint *rend;
 106   Rectangle *extents;
 107   gdouble width, height;
 108   gdouble x, y, initx, inity;
 109   gint xpos, ypos;
 110   guint nobjs = 0;
 111
 112   rend = new_gnomeprint_renderer(dia, ctx);
 113
 114   /* the usable area of the page */
 115   width = dia->data->paper.width;
 116   height = dia->data->paper.height;
 117
 118   /* get extents, and make them multiples of width / height */
 119   extents = &dia->data->extents;
 120   initx = extents->left;
 121   inity = extents->top;
 122   /* make page boundaries align with origin */
 123   if (!dia->data->paper.fitto) {
 124     initx = floor(initx / width)  * width;
 125     inity = floor(inity / height) * height;
 126   }
 127
 128   /* iterate through all the pages in the diagram */
 129   for (y = inity, ypos = 0; y < extents->bottom; y += height, ypos++)
 130     for (x = inity, xpos = 0; x < extents->right; x += width, xpos++) {
 131       Rectangle page_bounds;
 132
 133       page_bounds.left = x;
 134       page_bounds.right = x + width;
 135       page_bounds.top = y;
 136       page_bounds.bottom = y + height;
 137
 138       nobjs += print_page(dia->data, rend, &page_bounds, xpos, ypos);
 139     }
 140
 141   g_free(rend);
 142
 143   gnome_print_context_close(ctx);
 144
 145   gtk_object_unref(GTK_OBJECT(ctx));
 146 }
 147
 148 void
 149 diagram_print_gnome(Diagram *dia)
 150 {
 151   GtkWidget *dialog, *printersel;
 152   int btn;
 153   GnomePrinter *printer;
 154   GnomePrintContext *ctx;
 155
 156   dialog = gnome_dialog_new(_("Print Diagram"), GNOME_STOCK_BUTTON_OK,
 157                             GNOME_STOCK_BUTTON_CANCEL, NULL);
 158
 159   printersel = gnome_printer_widget_new();
 160   gtk_box_pack_start(GTK_BOX(GNOME_DIALOG(dialog)->vbox), printersel,
 161                      TRUE, TRUE, 0);
 162   gtk_widget_show(printersel);
 163
 164   gtk_window_set_modal(GTK_WINDOW(dialog), TRUE);
 165   btn = gnome_dialog_run(GNOME_DIALOG(dialog));
 166   if (btn < 0)
 167     return;
 168
 169   /* cancel was pressed */
 170   if (btn == 1) {
 171     gtk_widget_destroy(dialog);
 172     return;
 173   }
 174
 175   /* get the printer name */
 176   printer = gnome_printer_widget_get_printer(GNOME_PRINTER_WIDGET(printersel));
 177
 178   ctx = gnome_print_context_new_with_paper_size(printer,dia->data->paper.name);
 179
 180   if (ctx != NULL)
 181     paginate_gnomeprint(dia, ctx);
 182   else
 183     message_error(_("An error occured while creating the print context"));
 184
 185   gtk_object_unref(GTK_OBJECT(printer));
 186   gtk_widget_destroy(dialog);
 187 }