1 /*
2 * SVG <line> implementation
3 *
4 * Authors:
5 * Lauris Kaplinski <lauris@kaplinski.com>
6 * Abhishek Sharma
7 * Jon A. Cruz <jon@joncruz.org>
8 *
9 * Copyright (C) 1999-2002 Lauris Kaplinski
10 *
11 * Released under GNU GPL, read the file 'COPYING' for more information
12 */
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 "sp-guide.h"
21 #include "display/curve.h"
22 #include <glibmm/i18n.h>
23 #include <libnr/nr-matrix-fns.h>
24 #include <xml/repr.h>
25 #include "document.h"
26 #include "inkscape.h"
28 SPShapeClass * SPLineClass::static_parent_class = 0;
30 GType SPLine::sp_line_get_type(void)
31 {
32 static GType line_type = 0;
34 if (!line_type) {
35 GTypeInfo line_info = {
36 sizeof(SPLineClass),
37 NULL, /* base_init */
38 NULL, /* base_finalize */
39 (GClassInitFunc) SPLineClass::sp_line_class_init,
40 NULL, /* klass_finalize */
41 NULL, /* klass_data */
42 sizeof(SPLine),
43 16, /* n_preallocs */
44 (GInstanceInitFunc) init,
45 NULL, /* value_table */
46 };
47 line_type = g_type_register_static(SP_TYPE_SHAPE, "SPLine", &line_info,(GTypeFlags)0);
48 }
49 return line_type;
50 }
52 void SPLineClass::sp_line_class_init(SPLineClass *klass)
53 {
54 SPLineClass::static_parent_class = (SPShapeClass *) g_type_class_ref(SP_TYPE_SHAPE);
56 SPObjectClass *sp_object_class = (SPObjectClass *) klass;
57 sp_object_class->build = SPLine::build;
58 sp_object_class->set = SPLine::set;
59 sp_object_class->write = SPLine::write;
61 SPItemClass *item_class = (SPItemClass *) klass;
62 item_class->description = SPLine::getDescription;
63 item_class->set_transform = SPLine::setTransform;
64 item_class->convert_to_guides = SPLine::convertToGuides;
66 sp_object_class->update = SPLine::update;
68 SPShapeClass *shape_class = (SPShapeClass *) klass;
69 shape_class->set_shape = SPLine::setShape;
70 }
72 void SPLine::init(SPLine * line)
73 {
74 line->x1.unset();
75 line->y1.unset();
76 line->x2.unset();
77 line->y2.unset();
78 }
81 void SPLine::build(SPObject * object, SPDocument * document, Inkscape::XML::Node * repr)
82 {
83 if (((SPObjectClass *) SPLineClass::static_parent_class)->build) {
84 ((SPObjectClass *) SPLineClass::static_parent_class)->build(object, document, repr);
85 }
87 object->readAttr( "x1" );
88 object->readAttr( "y1" );
89 object->readAttr( "x2" );
90 object->readAttr( "y2" );
91 }
93 void SPLine::set(SPObject *object, unsigned int key, const gchar *value)
94 {
95 SPLine * line = SP_LINE(object);
97 /* fixme: we should really collect updates */
99 switch (key) {
100 case SP_ATTR_X1:
101 line->x1.readOrUnset(value);
102 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
103 break;
104 case SP_ATTR_Y1:
105 line->y1.readOrUnset(value);
106 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
107 break;
108 case SP_ATTR_X2:
109 line->x2.readOrUnset(value);
110 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
111 break;
112 case SP_ATTR_Y2:
113 line->y2.readOrUnset(value);
114 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
115 break;
116 default:
117 if (((SPObjectClass *) SPLineClass::static_parent_class)->set) {
118 ((SPObjectClass *) SPLineClass::static_parent_class)->set(object, key, value);
119 }
120 break;
121 }
122 }
124 void SPLine::update(SPObject *object, SPCtx *ctx, guint flags)
125 {
126 if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
127 SPLine *line = SP_LINE(object);
129 SPStyle const *style = object->style;
130 SPItemCtx const *ictx = (SPItemCtx const *) ctx;
131 double const w = (ictx->vp.x1 - ictx->vp.x0);
132 double const h = (ictx->vp.y1 - ictx->vp.y0);
133 double const em = style->font_size.computed;
134 double const ex = em * 0.5; // fixme: get from pango or libnrtype.
135 line->x1.update(em, ex, w);
136 line->x2.update(em, ex, w);
137 line->y1.update(em, ex, h);
138 line->y2.update(em, ex, h);
140 ((SPShape *) object)->setShape();
141 }
143 if (((SPObjectClass *) SPLineClass::static_parent_class)->update) {
144 ((SPObjectClass *) SPLineClass::static_parent_class)->update(object, ctx, flags);
145 }
146 }
149 Inkscape::XML::Node * SPLine::write(SPObject *object, Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags)
150 {
151 SPLine *line = SP_LINE(object);
153 if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
154 repr = xml_doc->createElement("svg:line");
155 }
157 if (repr != object->getRepr()) {
158 repr->mergeFrom(object->getRepr(), "id");
159 }
161 sp_repr_set_svg_double(repr, "x1", line->x1.computed);
162 sp_repr_set_svg_double(repr, "y1", line->y1.computed);
163 sp_repr_set_svg_double(repr, "x2", line->x2.computed);
164 sp_repr_set_svg_double(repr, "y2", line->y2.computed);
166 if (((SPObjectClass *) (SPLineClass::static_parent_class))->write) {
167 ((SPObjectClass *) (SPLineClass::static_parent_class))->write(object, xml_doc, repr, flags);
168 }
170 return repr;
171 }
173 gchar * SPLine::getDescription(SPItem */*item*/)
174 {
175 return g_strdup(_("<b>Line</b>"));
176 }
178 void SPLine::convertToGuides(SPItem *item)
179 {
180 SPLine *line = SP_LINE(item);
181 Geom::Point points[2];
183 Geom::Matrix const i2d(item->i2d_affine());
185 points[0] = Geom::Point(line->x1.computed, line->y1.computed)*i2d;
186 points[1] = Geom::Point(line->x2.computed, line->y2.computed)*i2d;
188 SPGuide::createSPGuide(inkscape_active_desktop(), points[0], points[1]);
189 }
191 Geom::Matrix SPLine::setTransform(SPItem *item, Geom::Matrix const &xform)
192 {
193 SPLine *line = SP_LINE(item);
194 Geom::Point points[2];
196 points[0] = Geom::Point(line->x1.computed, line->y1.computed);
197 points[1] = Geom::Point(line->x2.computed, line->y2.computed);
199 points[0] *= xform;
200 points[1] *= xform;
202 line->x1.computed = points[0][Geom::X];
203 line->y1.computed = points[0][Geom::Y];
204 line->x2.computed = points[1][Geom::X];
205 line->y2.computed = points[1][Geom::Y];
207 item->adjust_stroke(xform.descrim());
209 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
211 return Geom::identity();
212 }
214 void SPLine::setShape(SPShape *shape)
215 {
216 SPLine *line = SP_LINE(shape);
218 SPCurve *c = new SPCurve();
220 c->moveto(line->x1.computed, line->y1.computed);
221 c->lineto(line->x2.computed, line->y2.computed);
223 shape->setCurveInsync(c, TRUE); // *_insync does not call update, avoiding infinite recursion when set_shape is called by update
225 c->unref();
226 }
228 /*
229 Local Variables:
230 mode:c++
231 c-file-style:"stroustrup"
232 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
233 indent-tabs-mode:nil
234 fill-column:99
235 End:
236 */
237 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :