src/pattern.c

   1 /*
   2  * pattern.c : Support and specifications for patterns.
   3  *
   4  * Author:
   5  *     Jody Goldberg <jody@gnome.org>
   6  *
   7  *  (C) 1999-2003 Jody Goldberg
   8  */
   9 #include <gnumeric-config.h>
  10 #include <gnumeric.h>
  11 #include <pattern.h>
  12
  13 #include <style-color.h>
  14
  15 #include <goffice/utils/go-pattern.h>
  16
  17 static const GOPatternType patterns[] = {
  18         GO_PATTERN_SOLID, /* dummy filler */
  19         GO_PATTERN_SOLID,
  20         GO_PATTERN_GREY75,
  21         GO_PATTERN_GREY50,
  22         GO_PATTERN_GREY25,
  23         GO_PATTERN_GREY125,
  24         GO_PATTERN_GREY625,
  25         GO_PATTERN_HORIZ,
  26         GO_PATTERN_VERT,
  27         GO_PATTERN_DIAG,
  28         GO_PATTERN_REV_DIAG,
  29         GO_PATTERN_DIAG_CROSS,
  30         GO_PATTERN_THICK_DIAG_CROSS,
  31         GO_PATTERN_THIN_HORIZ,
  32         GO_PATTERN_THIN_VERT,
  33         GO_PATTERN_THIN_REV_DIAG,
  34         GO_PATTERN_THIN_DIAG,
  35         GO_PATTERN_THIN_HORIZ_CROSS,
  36         GO_PATTERN_THIN_DIAG_CROSS,
  37         GO_PATTERN_SMALL_CIRCLES,
  38         GO_PATTERN_SEMI_CIRCLES,
  39         GO_PATTERN_THATCH,
  40         GO_PATTERN_LARGE_CIRCLES,
  41         GO_PATTERN_BRICKS,
  42         GO_PATTERN_FOREGROUND_SOLID
  43 };
  44
  45 /**
  46  * gnm_pattern_background_set:
  47  * @mstyle:
  48  * @cr:
  49  * @is_selected:
  50  * @ctxt:
  51  *
  52  * Returns: %TRUE if there is a background to paint.
  53  *
  54  * Set up a cairo context to paint the background of a cell.
  55  */
  56
  57 gboolean
  58 gnm_pattern_background_set (GnmStyle const *mstyle, cairo_t *cr,
  59                             gboolean const is_selected, GtkStyleContext *ctxt)
  60 {
  61         int pattern;
  62
  63         g_return_val_if_fail (!is_selected || ctxt != NULL, FALSE);
  64
  65         /*
  66          * Draw the background if the PATTERN is non 0
  67          * Draw a stipple too if the pattern is > 1
  68          */
  69         pattern = gnm_style_get_pattern (mstyle);
  70         if (pattern > 0 && pattern < GNM_PATTERNS_MAX) {
  71                 GOPattern gopat;
  72                 cairo_pattern_t *crpat;
  73                 gopat.pattern = patterns[pattern];
  74                 gopat.fore = gnm_style_get_pattern_color (mstyle)->go_color;
  75                 gopat.back = gnm_style_get_back_color (mstyle)->go_color;
  76                 if (is_selected) {
  77                         GOColor light;
  78                         GdkRGBA rgba;
  79                         gtk_style_context_get_background_color
  80                                 (ctxt, GTK_STATE_FLAG_SELECTED, &rgba);
  81                         light = GO_COLOR_FROM_GDK_RGBA (rgba);
  82                         gopat.fore = GO_COLOR_INTERPOLATE (light, gopat.fore, .5);
  83                         gopat.back = GO_COLOR_INTERPOLATE (light, gopat.back, .5);
  84                 }
  85                 crpat = go_pattern_create_cairo_pattern (&gopat, cr);
  86                 if (crpat)
  87                         cairo_set_source (cr, crpat);
  88                 cairo_pattern_destroy (crpat);
  89                 return TRUE;
  90         } else if (is_selected) {
  91                 GdkRGBA rgba;
  92                 GOColor color;
  93
  94                 gtk_style_context_get_background_color (ctxt, GTK_STATE_FLAG_SELECTED, &rgba);
  95                 color = GO_COLOR_FROM_GDK_RGBA (rgba);
  96                 /* Make a lighter version. */
  97                 color = GO_COLOR_INTERPOLATE (GO_COLOR_WHITE, color, .5);
  98                 cairo_set_source_rgba (cr, GO_COLOR_TO_CAIRO (color));
  99         }
 100         return FALSE;
 101 }