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sp-guide.cpp

#define __SP_GUIDE_C__

/*
 * Inkscape guideline implementation
 *
 * Authors:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   Peter Moulder <pmoulder@mail.csse.monash.edu.au>
 *
 * Copyright (C) 2000-2002 authors
 * Copyright (C) 2004 Monash University
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include "display/guideline.h"
#include "svg/svg.h"
#include "attributes.h"
#include "sp-guide.h"
#include <sp-guide-attachment.h>
#include <sp-item-notify-moveto.h>
#include <sp-item.h>
#include <sp-guide-constraint.h>
#include <libnr/nr-values.h>
#include <glibmm/i18n.h>
#include <xml/repr.h>
#include <remove-last.h>
using std::vector;

enum {
    PROP_0,
    PROP_COLOR,
    PROP_HICOLOR
};

static void sp_guide_class_init(SPGuideClass *gc);
static void sp_guide_init(SPGuide *guide);
static void sp_guide_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void sp_guide_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);

static void sp_guide_build(SPObject *object, SPDocument *document, SPRepr *repr);
static void sp_guide_release(SPObject *object);
static void sp_guide_set(SPObject *object, unsigned int key, const gchar *value);

static SPObjectClass *parent_class;

GType sp_guide_get_type(void)
{
    static GType guide_type = 0;
    
    if (!guide_type) {
        GTypeInfo guide_info = {
            sizeof(SPGuideClass),
            NULL, NULL,
            (GClassInitFunc) sp_guide_class_init,
            NULL, NULL,
            sizeof(SPGuide),
            16,
            (GInstanceInitFunc) sp_guide_init,
            NULL, /* value_table */
        };
        guide_type = g_type_register_static(SP_TYPE_OBJECT, "SPGuide", &guide_info, (GTypeFlags) 0);
    }
    
    return guide_type;
}

static void sp_guide_class_init(SPGuideClass *gc)
{
    GObjectClass *gobject_class = (GObjectClass *) gc;
    SPObjectClass *sp_object_class = (SPObjectClass *) gc;
    
    parent_class = (SPObjectClass*) g_type_class_ref(SP_TYPE_OBJECT);
    
    gobject_class->set_property = sp_guide_set_property;
    gobject_class->get_property = sp_guide_get_property;
    
    sp_object_class->build = sp_guide_build;
    sp_object_class->release = sp_guide_release;
    sp_object_class->set = sp_guide_set;

    g_object_class_install_property(gobject_class,
                                    PROP_COLOR,
                                    g_param_spec_uint("color", "Color", "Color",
                                                      0,
                                                      0xffffffff,
                                                      0xff000000,
                                                      (GParamFlags) G_PARAM_READWRITE));
    
    g_object_class_install_property(gobject_class,
                                    PROP_HICOLOR,
                                    g_param_spec_uint("hicolor", "HiColor", "HiColor",
                                                      0,
                                                      0xffffffff,
                                                      0xff000000,
                                                      (GParamFlags) G_PARAM_READWRITE));
}

static void sp_guide_init(SPGuide *guide)
{
    guide->normal = component_vectors[NR::Y];
    /* constrain y coordinate; horizontal line.  I doubt it ever matters what we initialize
       this to. */
    guide->position = 0.0;
    guide->color = 0x0000ff7f;
    guide->hicolor = 0xff00007f;
}

static void sp_guide_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
    SPGuide &guide = *SP_GUIDE(object);

    switch (prop_id) {
      case PROP_COLOR:
            guide.color = g_value_get_uint(value);
            for (GSList *l = guide.views; l != NULL; l = l->next) {
                sp_guideline_set_color(SP_GUIDELINE(l->data), guide.color);
            }
            break;

      case PROP_HICOLOR:
            guide.hicolor = g_value_get_uint(value);
            break;
    }
}

static void sp_guide_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
    SPGuide const &guide = *SP_GUIDE(object);

    switch (prop_id) {
      case PROP_COLOR:
            g_value_set_uint(value, guide.color);
            break;
      case PROP_HICOLOR:
            g_value_set_uint(value, guide.hicolor);
            break;
    }
}

static void sp_guide_build(SPObject *object, SPDocument *document, SPRepr *repr)
{
    if (((SPObjectClass *) (parent_class))->build) {
        (* ((SPObjectClass *) (parent_class))->build)(object, document, repr);
    }
    
    sp_object_read_attr(object, "orientation");
    sp_object_read_attr(object, "position");
}

static void sp_guide_release(SPObject *object)
{
    SPGuide *guide = (SPGuide *) object;
    
    while (guide->views) {
        gtk_object_destroy(GTK_OBJECT(guide->views->data));
        guide->views = g_slist_remove(guide->views, guide->views->data);
    }
    
    if (((SPObjectClass *) parent_class)->release) {
        ((SPObjectClass *) parent_class)->release(object);
    }
}

static void sp_guide_set(SPObject *object, unsigned int key, const gchar *value)
{
    SPGuide *guide = SP_GUIDE(object);

    switch (key) {
      case SP_ATTR_ORIENTATION:
            if (value && !strcmp(value, "horizontal")) {
                /* Visual representation of a horizontal line, constrain vertically (y coordinate). */
                guide->normal = component_vectors[NR::Y];
            } else {
                guide->normal = component_vectors[NR::X];
            }
            break;
      case SP_ATTR_POSITION:
            sp_svg_number_read_d(value, &guide->position);
            // update position in non-committing way
            // fixme: perhaps we need to add an update method instead, and request_update here
            sp_guide_moveto(*guide, guide->position, false);
            break;
      default:
            if (((SPObjectClass *) (parent_class))->set) {
                ((SPObjectClass *) (parent_class))->set(object, key, value);
            }
            break;
    }
}

void sp_guide_show(SPGuide *guide, SPCanvasGroup *group, GCallback handler)
{
    bool const vertical_line_p = ( guide->normal == component_vectors[NR::X] );
    g_assert(( guide->normal == component_vectors[NR::X] )  ||
             ( guide->normal == component_vectors[NR::Y] ) );
    SPCanvasItem *item = sp_guideline_new(group, guide->position, vertical_line_p);
    sp_guideline_set_color(SP_GUIDELINE(item), guide->color);
    
    g_signal_connect(G_OBJECT(item), "event", G_CALLBACK(handler), guide);

    guide->views = g_slist_prepend(guide->views, item);
}

void sp_guide_hide(SPGuide *guide, SPCanvas *canvas)
{
    g_assert(guide != NULL);
    g_assert(SP_IS_GUIDE(guide));
    g_assert(canvas != NULL);
    g_assert(SP_IS_CANVAS(canvas));
    
    for (GSList *l = guide->views; l != NULL; l = l->next) {
        if (canvas == SP_CANVAS_ITEM(l->data)->canvas) {
            gtk_object_destroy(GTK_OBJECT(l->data));
            guide->views = g_slist_remove(guide->views, l->data);
            return;
        }
    }
    
    g_assert_not_reached();
}

void sp_guide_sensitize(SPGuide *guide, SPCanvas *canvas, gboolean sensitive)
{
    g_assert(guide != NULL);
    g_assert(SP_IS_GUIDE(guide));
    g_assert(canvas != NULL);
    g_assert(SP_IS_CANVAS(canvas));
    
    for (GSList *l = guide->views; l != NULL; l = l->next) {
        if (canvas == SP_CANVAS_ITEM(l->data)->canvas) {
            sp_guideline_set_sensitive(SP_GUIDELINE(l->data), sensitive);
            return;
        }
    }
    
    g_assert_not_reached();
}

double sp_guide_position_from_pt(SPGuide const *guide, NR::Point const &pt)
{
    return dot(guide->normal, pt);
}

/**
 * \arg commit False indicates temporary moveto in response to motion event while dragging,
 *          true indicates a "committing" version: in response to button release event after
 *          dragging a guideline, or clicking OK in guide editing dialog.
 */
void sp_guide_moveto(SPGuide const &guide, gdouble const position, bool const commit)
{
    g_assert(SP_IS_GUIDE(&guide));

    for (GSList *l = guide.views; l != NULL; l = l->next) {
        sp_guideline_set_position(SP_GUIDELINE(l->data),
                                  position);
    }

    /* Calling sp_repr_set_double must precede calling sp_item_notify_moveto in the commit
       case, so that the guide's new position is available for sp_item_rm_unsatisfied_cns. */
    if (commit) {
        sp_repr_set_double(SP_OBJECT(&guide)->repr,
                           "position", position);
    }
    
    for (vector<SPGuideAttachment>::const_iterator i(guide.attached_items.begin()),
             iEnd(guide.attached_items.end());
         i != iEnd; ++i)
    {
        SPGuideAttachment const &att = *i;
        sp_item_notify_moveto(*att.item, guide, att.snappoint_ix, position, commit);
    }
}

/**
 * Returns a human-readable description of the guideline for use in dialog boxes and status bar.
 *
 * The caller is responsible for freeing the string.
 */
char *sp_guide_description(SPGuide const *guide)
{
    using NR::X;
    using NR::Y;
    
    if ( guide->normal == component_vectors[X] ) {
        return g_strdup(_("vertical guideline"));
    } else if ( guide->normal == component_vectors[Y] ) {
        return g_strdup(_("horizontal guideline"));
    } else {
        double const radians = atan2(guide->normal[X],
                                     guide->normal[Y]);
        /* flip y axis and rotate 90 degrees to convert to line angle */
        double const degrees = ( radians / M_PI ) * 180.0;
        int const degrees_int = (int) floor( degrees + .5 );
        return g_strdup_printf("%d degree guideline", degrees_int);
        /* Alternative suggestion: "angled guideline". */
    }
}

void sp_guide_remove(SPGuide *guide)
{
    g_assert(SP_IS_GUIDE(guide));
    
    for (vector<SPGuideAttachment>::const_iterator i(guide->attached_items.begin()),
             iEnd(guide->attached_items.end());
         i != iEnd; ++i)
    {
        SPGuideAttachment const &att = *i;
        remove_last(att.item->constraints, SPGuideConstraint(guide, att.snappoint_ix));
    }
    guide->attached_items.clear();
    
    sp_repr_unparent(SP_OBJECT(guide)->repr);
}

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :

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