src/sp-guide.cpp

   1 #define __SP_GUIDE_C__
   2
   3 /*
   4  * Inkscape guideline implementation
   5  *
   6  * Authors:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   Peter Moulder <pmoulder@mail.csse.monash.edu.au>
   9  *
  10  * Copyright (C) 2000-2002 authors
  11  * Copyright (C) 2004 Monash University
  12  *
  13  * Released under GNU GPL, read the file 'COPYING' for more information
  14  */
  15
  16 #ifdef HAVE_CONFIG_H
  17 # include <config.h>
  18 #endif
  19 #include "display/guideline.h"
  20 #include "svg/svg.h"
  21 #include "attributes.h"
  22 #include "sp-guide.h"
  23 #include <sp-item-notify-moveto.h>
  24 #include <sp-item.h>
  25 #include <sp-guide-constraint.h>
  26 #include <glibmm/i18n.h>
  27 #include <xml/repr.h>
  28 #include <remove-last.h>
  29 using std::vector;
  30
  31 enum {
  32     PROP_0,
  33     PROP_COLOR,
  34     PROP_HICOLOR
  35 };
  36
  37 static void sp_guide_class_init(SPGuideClass *gc);
  38 static void sp_guide_init(SPGuide *guide);
  39 static void sp_guide_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
  40 static void sp_guide_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
  41
  42 static void sp_guide_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
  43 static void sp_guide_release(SPObject *object);
  44 static void sp_guide_set(SPObject *object, unsigned int key, const gchar *value);
  45
  46 static SPObjectClass *parent_class;
  47
  48 GType sp_guide_get_type(void)
  49 {
  50     static GType guide_type = 0;
  51
  52     if (!guide_type) {
  53         GTypeInfo guide_info = {
  54             sizeof(SPGuideClass),
  55             NULL, NULL,
  56             (GClassInitFunc) sp_guide_class_init,
  57             NULL, NULL,
  58             sizeof(SPGuide),
  59             16,
  60             (GInstanceInitFunc) sp_guide_init,
  61             NULL,       /* value_table */
  62         };
  63         guide_type = g_type_register_static(SP_TYPE_OBJECT, "SPGuide", &guide_info, (GTypeFlags) 0);
  64     }
  65
  66     return guide_type;
  67 }
  68
  69 static void sp_guide_class_init(SPGuideClass *gc)
  70 {
  71     GObjectClass *gobject_class = (GObjectClass *) gc;
  72     SPObjectClass *sp_object_class = (SPObjectClass *) gc;
  73
  74     parent_class = (SPObjectClass*) g_type_class_ref(SP_TYPE_OBJECT);
  75
  76     gobject_class->set_property = sp_guide_set_property;
  77     gobject_class->get_property = sp_guide_get_property;
  78
  79     sp_object_class->build = sp_guide_build;
  80     sp_object_class->release = sp_guide_release;
  81     sp_object_class->set = sp_guide_set;
  82
  83     g_object_class_install_property(gobject_class,
  84                                     PROP_COLOR,
  85                                     g_param_spec_uint("color", "Color", "Color",
  86                                                       0,
  87                                                       0xffffffff,
  88                                                       0xff000000,
  89                                                       (GParamFlags) G_PARAM_READWRITE));
  90
  91     g_object_class_install_property(gobject_class,
  92                                     PROP_HICOLOR,
  93                                     g_param_spec_uint("hicolor", "HiColor", "HiColor",
  94                                                       0,
  95                                                       0xffffffff,
  96                                                       0xff000000,
  97                                                       (GParamFlags) G_PARAM_READWRITE));
  98 }
  99
 100 static void sp_guide_init(SPGuide *guide)
 101 {
 102     guide->normal = component_vectors[NR::Y];
 103     /* constrain y coordinate; horizontal line.  I doubt it ever matters what we initialize
 104        this to. */
 105     guide->position = 0.0;
 106     guide->color = 0x0000ff7f;
 107     guide->hicolor = 0xff00007f;
 108 }
 109
 110 static void sp_guide_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
 111 {
 112     SPGuide &guide = *SP_GUIDE(object);
 113
 114     switch (prop_id) {
 115         case PROP_COLOR:
 116             guide.color = g_value_get_uint(value);
 117             for (GSList *l = guide.views; l != NULL; l = l->next) {
 118                 sp_guideline_set_color(SP_GUIDELINE(l->data), guide.color);
 119             }
 120             break;
 121
 122         case PROP_HICOLOR:
 123             guide.hicolor = g_value_get_uint(value);
 124             break;
 125     }
 126 }
 127
 128 static void sp_guide_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
 129 {
 130     SPGuide const &guide = *SP_GUIDE(object);
 131
 132     switch (prop_id) {
 133         case PROP_COLOR:
 134             g_value_set_uint(value, guide.color);
 135             break;
 136         case PROP_HICOLOR:
 137             g_value_set_uint(value, guide.hicolor);
 138             break;
 139     }
 140 }
 141
 142 static void sp_guide_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
 143 {
 144     if (((SPObjectClass *) (parent_class))->build) {
 145         (* ((SPObjectClass *) (parent_class))->build)(object, document, repr);
 146     }
 147
 148     sp_object_read_attr(object, "orientation");
 149     sp_object_read_attr(object, "position");
 150 }
 151
 152 static void sp_guide_release(SPObject *object)
 153 {
 154     SPGuide *guide = (SPGuide *) object;
 155
 156     while (guide->views) {
 157         gtk_object_destroy(GTK_OBJECT(guide->views->data));
 158         guide->views = g_slist_remove(guide->views, guide->views->data);
 159     }
 160
 161     if (((SPObjectClass *) parent_class)->release) {
 162         ((SPObjectClass *) parent_class)->release(object);
 163     }
 164 }
 165
 166 static void sp_guide_set(SPObject *object, unsigned int key, const gchar *value)
 167 {
 168     SPGuide *guide = SP_GUIDE(object);
 169
 170     switch (key) {
 171         case SP_ATTR_ORIENTATION:
 172             if (value && !strcmp(value, "horizontal")) {
 173                 /* Visual representation of a horizontal line, constrain vertically (y coordinate). */
 174                 guide->normal = component_vectors[NR::Y];
 175             } else {
 176                 guide->normal = component_vectors[NR::X];
 177             }
 178             break;
 179         case SP_ATTR_POSITION:
 180             sp_svg_number_read_d(value, &guide->position);
 181             // update position in non-committing way
 182             // fixme: perhaps we need to add an update method instead, and request_update here
 183             sp_guide_moveto(*guide, guide->position, false);
 184             break;
 185         default:
 186             if (((SPObjectClass *) (parent_class))->set) {
 187                 ((SPObjectClass *) (parent_class))->set(object, key, value);
 188             }
 189             break;
 190     }
 191 }
 192
 193 void sp_guide_show(SPGuide *guide, SPCanvasGroup *group, GCallback handler)
 194 {
 195     bool const vertical_line_p = ( guide->normal == component_vectors[NR::X] );
 196     g_assert(( guide->normal == component_vectors[NR::X] )  ||
 197              ( guide->normal == component_vectors[NR::Y] ) );
 198     SPCanvasItem *item = sp_guideline_new(group, guide->position, vertical_line_p);
 199     sp_guideline_set_color(SP_GUIDELINE(item), guide->color);
 200
 201     g_signal_connect(G_OBJECT(item), "event", G_CALLBACK(handler), guide);
 202
 203     guide->views = g_slist_prepend(guide->views, item);
 204 }
 205
 206 void sp_guide_hide(SPGuide *guide, SPCanvas *canvas)
 207 {
 208     g_assert(guide != NULL);
 209     g_assert(SP_IS_GUIDE(guide));
 210     g_assert(canvas != NULL);
 211     g_assert(SP_IS_CANVAS(canvas));
 212
 213     for (GSList *l = guide->views; l != NULL; l = l->next) {
 214         if (canvas == SP_CANVAS_ITEM(l->data)->canvas) {
 215             gtk_object_destroy(GTK_OBJECT(l->data));
 216             guide->views = g_slist_remove(guide->views, l->data);
 217             return;
 218         }
 219     }
 220
 221     g_assert_not_reached();
 222 }
 223
 224 void sp_guide_sensitize(SPGuide *guide, SPCanvas *canvas, gboolean sensitive)
 225 {
 226     g_assert(guide != NULL);
 227     g_assert(SP_IS_GUIDE(guide));
 228     g_assert(canvas != NULL);
 229     g_assert(SP_IS_CANVAS(canvas));
 230
 231     for (GSList *l = guide->views; l != NULL; l = l->next) {
 232         if (canvas == SP_CANVAS_ITEM(l->data)->canvas) {
 233             sp_guideline_set_sensitive(SP_GUIDELINE(l->data), sensitive);
 234             return;
 235         }
 236     }
 237
 238     g_assert_not_reached();
 239 }
 240
 241 double sp_guide_position_from_pt(SPGuide const *guide, NR::Point const &pt)
 242 {
 243     return dot(guide->normal, pt);
 244 }
 245
 246 /**
 247  * \arg commit False indicates temporary moveto in response to motion event while dragging,
 248  *              true indicates a "committing" version: in response to button release event after
 249  *              dragging a guideline, or clicking OK in guide editing dialog.
 250  */
 251 void sp_guide_moveto(SPGuide const &guide, gdouble const position, bool const commit)
 252 {
 253     g_assert(SP_IS_GUIDE(&guide));
 254
 255     for (GSList *l = guide.views; l != NULL; l = l->next) {
 256         sp_guideline_set_position(SP_GUIDELINE(l->data),
 257                                   position);
 258     }
 259
 260     /* Calling sp_repr_set_svg_double must precede calling sp_item_notify_moveto in the commit
 261        case, so that the guide's new position is available for sp_item_rm_unsatisfied_cns. */
 262     if (commit) {
 263         sp_repr_set_svg_double(SP_OBJECT(&guide)->repr,
 264                            "position", position);
 265     }
 266
 267     for (vector<SPGuideAttachment>::const_iterator i(guide.attached_items.begin()),
 268              iEnd(guide.attached_items.end());
 269          i != iEnd; ++i)
 270     {
 271         SPGuideAttachment const &att = *i;
 272         sp_item_notify_moveto(*att.item, guide, att.snappoint_ix, position, commit);
 273     }
 274 }
 275
 276 /**
 277  * Returns a human-readable description of the guideline for use in dialog boxes and status bar.
 278  *
 279  * The caller is responsible for freeing the string.
 280  */
 281 char *sp_guide_description(SPGuide const *guide)
 282 {
 283     using NR::X;
 284     using NR::Y;
 285
 286     if ( guide->normal == component_vectors[X] ) {
 287         return g_strdup(_("vertical guideline"));
 288     } else if ( guide->normal == component_vectors[Y] ) {
 289         return g_strdup(_("horizontal guideline"));
 290     } else {
 291         double const radians = atan2(guide->normal[X],
 292                                      guide->normal[Y]);
 293         /* flip y axis and rotate 90 degrees to convert to line angle */
 294         double const degrees = ( radians / M_PI ) * 180.0;
 295         int const degrees_int = (int) floor( degrees + .5 );
 296         return g_strdup_printf("%d degree guideline", degrees_int);
 297         /* Alternative suggestion: "angled guideline". */
 298     }
 299 }
 300
 301 void sp_guide_remove(SPGuide *guide)
 302 {
 303     g_assert(SP_IS_GUIDE(guide));
 304
 305     for (vector<SPGuideAttachment>::const_iterator i(guide->attached_items.begin()),
 306              iEnd(guide->attached_items.end());
 307          i != iEnd; ++i)
 308     {
 309         SPGuideAttachment const &att = *i;
 310         remove_last(att.item->constraints, SPGuideConstraint(guide, att.snappoint_ix));
 311     }
 312     guide->attached_items.clear();
 313
 314     sp_repr_unparent(SP_OBJECT(guide)->repr);
 315 }
 316
 317 /*
 318   Local Variables:
 319   mode:c++
 320   c-file-style:"stroustrup"
 321   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 322   indent-tabs-mode:nil
 323   fill-column:99
 324   End:
 325 */
 326 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :