src/sp-line.cpp

   1 #define __SP_LINE_C__
   2
   3 /*
   4  * SVG <line> implementation
   5  *
   6  * Authors:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *
   9  * Copyright (C) 1999-2002 Lauris Kaplinski
  10  *
  11  * Released under GNU GPL, read the file 'COPYING' for more information
  12  */
  13
  14 #ifdef HAVE_CONFIG_H
  15 # include <config.h>
  16 #endif
  17 #include "attributes.h"
  18 #include "style.h"
  19 #include "sp-line.h"
  20 #include "display/curve.h"
  21 #include <glibmm/i18n.h>
  22 #include <libnr/nr-matrix-fns.h>
  23 #include <xml/repr.h>
  24 #include "document.h"
  25
  26 static void sp_line_class_init (SPLineClass *klass);
  27 static void sp_line_init (SPLine *line);
  28
  29 static void sp_line_build (SPObject * object, SPDocument * document, Inkscape::XML::Node * repr);
  30 static void sp_line_set (SPObject *object, unsigned int key, const gchar *value);
  31 static Inkscape::XML::Node *sp_line_write (SPObject *object, Inkscape::XML::Node *repr, guint flags);
  32
  33 static gchar *sp_line_description (SPItem * item);
  34 static NR::Matrix sp_line_set_transform(SPItem *item, NR::Matrix const &xform);
  35
  36 static void sp_line_update (SPObject *object, SPCtx *ctx, guint flags);
  37 static void sp_line_set_shape (SPShape *shape);
  38
  39 static SPShapeClass *parent_class;
  40
  41 GType
  42 sp_line_get_type (void)
  43 {
  44         static GType line_type = 0;
  45
  46         if (!line_type) {
  47                 GTypeInfo line_info = {
  48                         sizeof (SPLineClass),
  49                         NULL,   /* base_init */
  50                         NULL,   /* base_finalize */
  51                         (GClassInitFunc) sp_line_class_init,
  52                         NULL,   /* klass_finalize */
  53                         NULL,   /* klass_data */
  54                         sizeof (SPLine),
  55                         16,     /* n_preallocs */
  56                         (GInstanceInitFunc) sp_line_init,
  57                         NULL,   /* value_table */
  58                 };
  59                 line_type = g_type_register_static (SP_TYPE_SHAPE, "SPLine", &line_info, (GTypeFlags)0);
  60         }
  61         return line_type;
  62 }
  63
  64 static void
  65 sp_line_class_init (SPLineClass *klass)
  66 {
  67         parent_class = (SPShapeClass *) g_type_class_ref (SP_TYPE_SHAPE);
  68
  69         SPObjectClass *sp_object_class = (SPObjectClass *) klass;
  70         sp_object_class->build = sp_line_build;
  71         sp_object_class->set = sp_line_set;
  72         sp_object_class->write = sp_line_write;
  73
  74         SPItemClass *item_class = (SPItemClass *) klass;
  75         item_class->description = sp_line_description;
  76         item_class->set_transform = sp_line_set_transform;
  77
  78         sp_object_class->update = sp_line_update;
  79
  80         SPShapeClass *shape_class = (SPShapeClass *) klass;
  81         shape_class->set_shape = sp_line_set_shape;
  82 }
  83
  84 static void
  85 sp_line_init (SPLine * line)
  86 {
  87         line->x1.unset();
  88         line->y1.unset();
  89         line->x2.unset();
  90         line->y2.unset();
  91 }
  92
  93
  94 static void
  95 sp_line_build (SPObject * object, SPDocument * document, Inkscape::XML::Node * repr)
  96 {
  97         if (((SPObjectClass *) parent_class)->build) {
  98                 ((SPObjectClass *) parent_class)->build (object, document, repr);
  99         }
 100
 101         sp_object_read_attr (object, "x1");
 102         sp_object_read_attr (object, "y1");
 103         sp_object_read_attr (object, "x2");
 104         sp_object_read_attr (object, "y2");
 105 }
 106
 107 static void
 108 sp_line_set (SPObject *object, unsigned int key, const gchar *value)
 109 {
 110         SPLine * line = SP_LINE (object);
 111
 112         /* fixme: we should really collect updates */
 113
 114         switch (key) {
 115         case SP_ATTR_X1:
 116                 line->x1.readOrUnset(value);
 117                 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
 118                 break;
 119         case SP_ATTR_Y1:
 120                 line->y1.readOrUnset(value);
 121                 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
 122                 break;
 123         case SP_ATTR_X2:
 124                 line->x2.readOrUnset(value);
 125                 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
 126                 break;
 127         case SP_ATTR_Y2:
 128                 line->y2.readOrUnset(value);
 129                 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
 130                 break;
 131         default:
 132                 if (((SPObjectClass *) parent_class)->set)
 133                         ((SPObjectClass *) parent_class)->set (object, key, value);
 134                 break;
 135         }
 136 }
 137
 138 static void
 139 sp_line_update (SPObject *object, SPCtx *ctx, guint flags)
 140 {
 141         if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
 142                 SPLine *line = SP_LINE (object);
 143
 144                 SPStyle const *style = object->style;
 145                 double const d = 1.0 / NR::expansion(((SPItemCtx const *) ctx)->i2vp);
 146                 double const em = style->font_size.computed;
 147                 double const ex = em * 0.5;  // fixme: get from pango or libnrtype.
 148                 line->x1.update(em, ex, d);
 149                 line->x2.update(em, ex, d);
 150                 line->y1.update(em, ex, d);
 151                 line->y2.update(em, ex, d);
 152
 153                 sp_shape_set_shape ((SPShape *) object);
 154         }
 155
 156         if (((SPObjectClass *) parent_class)->update)
 157                 ((SPObjectClass *) parent_class)->update (object, ctx, flags);
 158 }
 159
 160
 161 static Inkscape::XML::Node *
 162 sp_line_write (SPObject *object, Inkscape::XML::Node *repr, guint flags)
 163 {
 164         SPLine *line  = SP_LINE (object);
 165
 166         if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
 167                 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_OBJECT_DOCUMENT(object));
 168                 repr = xml_doc->createElement("svg:line");
 169         }
 170
 171         if (repr != SP_OBJECT_REPR (object)) {
 172                 repr->mergeFrom(SP_OBJECT_REPR (object), "id");
 173         }
 174
 175         sp_repr_set_svg_double(repr, "x1", line->x1.computed);
 176         sp_repr_set_svg_double(repr, "y1", line->y1.computed);
 177         sp_repr_set_svg_double(repr, "x2", line->x2.computed);
 178         sp_repr_set_svg_double(repr, "y2", line->y2.computed);
 179
 180         if (((SPObjectClass *) (parent_class))->write)
 181                 ((SPObjectClass *) (parent_class))->write (object, repr, flags);
 182
 183         return repr;
 184 }
 185
 186 static gchar *
 187 sp_line_description(SPItem *item)
 188 {
 189         return g_strdup(_("<b>Line</b>"));
 190 }
 191
 192 static NR::Matrix
 193 sp_line_set_transform (SPItem *item, NR::Matrix const &xform)
 194 {
 195         SPLine *line = SP_LINE (item);
 196         NR::Point points[2];
 197
 198         points[0] = NR::Point(line->x1.computed, line->y1.computed);
 199         points[1] = NR::Point(line->x2.computed, line->y2.computed);
 200
 201         points[0] *= xform;
 202         points[1] *= xform;
 203
 204         line->x1.computed = points[0][NR::X];
 205         line->y1.computed = points[0][NR::Y];
 206         line->x2.computed = points[1][NR::X];
 207         line->y2.computed = points[1][NR::Y];
 208
 209         sp_item_adjust_stroke(item, NR::expansion(xform));
 210
 211         SP_OBJECT (item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
 212
 213         return NR::identity();
 214 }
 215
 216 static void
 217 sp_line_set_shape (SPShape *shape)
 218 {
 219         SPLine *line = SP_LINE (shape);
 220
 221         SPCurve *c = sp_curve_new ();
 222
 223         sp_curve_moveto (c, line->x1.computed, line->y1.computed);
 224         sp_curve_lineto (c, line->x2.computed, line->y2.computed);
 225
 226         sp_shape_set_curve_insync (shape, c, TRUE); // *_insync does not call update, avoiding infinite recursion when set_shape is called by update
 227
 228         sp_curve_unref (c);
 229 }