1 #define __SP_LINE_C__
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 */
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>
25 static void sp_line_class_init (SPLineClass *klass);
26 static void sp_line_init (SPLine *line);
28 static void sp_line_build (SPObject * object, SPDocument * document, Inkscape::XML::Node * repr);
29 static void sp_line_set (SPObject *object, unsigned int key, const gchar *value);
30 static Inkscape::XML::Node *sp_line_write (SPObject *object, Inkscape::XML::Node *repr, guint flags);
32 static gchar *sp_line_description (SPItem * item);
33 static NR::Matrix sp_line_set_transform(SPItem *item, NR::Matrix const &xform);
35 static void sp_line_update (SPObject *object, SPCtx *ctx, guint flags);
36 static void sp_line_set_shape (SPShape *shape);
38 static SPShapeClass *parent_class;
40 GType
41 sp_line_get_type (void)
42 {
43 static GType line_type = 0;
45 if (!line_type) {
46 GTypeInfo line_info = {
47 sizeof (SPLineClass),
48 NULL, /* base_init */
49 NULL, /* base_finalize */
50 (GClassInitFunc) sp_line_class_init,
51 NULL, /* klass_finalize */
52 NULL, /* klass_data */
53 sizeof (SPLine),
54 16, /* n_preallocs */
55 (GInstanceInitFunc) sp_line_init,
56 NULL, /* value_table */
57 };
58 line_type = g_type_register_static (SP_TYPE_SHAPE, "SPLine", &line_info, (GTypeFlags)0);
59 }
60 return line_type;
61 }
63 static void
64 sp_line_class_init (SPLineClass *klass)
65 {
66 parent_class = (SPShapeClass *) g_type_class_ref (SP_TYPE_SHAPE);
68 SPObjectClass *sp_object_class = (SPObjectClass *) klass;
69 sp_object_class->build = sp_line_build;
70 sp_object_class->set = sp_line_set;
71 sp_object_class->write = sp_line_write;
73 SPItemClass *item_class = (SPItemClass *) klass;
74 item_class->description = sp_line_description;
75 item_class->set_transform = sp_line_set_transform;
77 sp_object_class->update = sp_line_update;
79 SPShapeClass *shape_class = (SPShapeClass *) klass;
80 shape_class->set_shape = sp_line_set_shape;
81 }
83 static void
84 sp_line_init (SPLine * line)
85 {
86 line->x1.unset();
87 line->y1.unset();
88 line->x2.unset();
89 line->y2.unset();
90 }
93 static void
94 sp_line_build (SPObject * object, SPDocument * document, Inkscape::XML::Node * repr)
95 {
96 if (((SPObjectClass *) parent_class)->build) {
97 ((SPObjectClass *) parent_class)->build (object, document, repr);
98 }
100 sp_object_read_attr (object, "x1");
101 sp_object_read_attr (object, "y1");
102 sp_object_read_attr (object, "x2");
103 sp_object_read_attr (object, "y2");
104 }
106 static void
107 sp_line_set (SPObject *object, unsigned int key, const gchar *value)
108 {
109 SPLine * line = SP_LINE (object);
111 /* fixme: we should really collect updates */
113 switch (key) {
114 case SP_ATTR_X1:
115 line->x1.readOrUnset(value);
116 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
117 break;
118 case SP_ATTR_Y1:
119 line->y1.readOrUnset(value);
120 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
121 break;
122 case SP_ATTR_X2:
123 line->x2.readOrUnset(value);
124 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
125 break;
126 case SP_ATTR_Y2:
127 line->y2.readOrUnset(value);
128 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
129 break;
130 default:
131 if (((SPObjectClass *) parent_class)->set)
132 ((SPObjectClass *) parent_class)->set (object, key, value);
133 break;
134 }
135 }
137 static void
138 sp_line_update (SPObject *object, SPCtx *ctx, guint flags)
139 {
140 if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
141 SPLine *line = SP_LINE (object);
143 SPStyle const *style = object->style;
144 double const d = 1.0 / NR::expansion(((SPItemCtx const *) ctx)->i2vp);
145 double const em = style->font_size.computed;
146 double const ex = em * 0.5; // fixme: get from pango or libnrtype.
147 line->x1.update(em, ex, d);
148 line->x2.update(em, ex, d);
149 line->y1.update(em, ex, d);
150 line->y2.update(em, ex, d);
152 sp_shape_set_shape ((SPShape *) object);
153 }
155 if (((SPObjectClass *) parent_class)->update)
156 ((SPObjectClass *) parent_class)->update (object, ctx, flags);
157 }
160 static Inkscape::XML::Node *
161 sp_line_write (SPObject *object, Inkscape::XML::Node *repr, guint flags)
162 {
163 SPLine *line = SP_LINE (object);
165 if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
166 repr = sp_repr_new ("svg:line");
167 }
169 if (repr != SP_OBJECT_REPR (object)) {
170 repr->mergeFrom(SP_OBJECT_REPR (object), "id");
171 }
173 sp_repr_set_svg_double(repr, "x1", line->x1.computed);
174 sp_repr_set_svg_double(repr, "y1", line->y1.computed);
175 sp_repr_set_svg_double(repr, "x2", line->x2.computed);
176 sp_repr_set_svg_double(repr, "y2", line->y2.computed);
178 if (((SPObjectClass *) (parent_class))->write)
179 ((SPObjectClass *) (parent_class))->write (object, repr, flags);
181 return repr;
182 }
184 static gchar *
185 sp_line_description(SPItem *item)
186 {
187 return g_strdup(_("<b>Line</b>"));
188 }
190 static NR::Matrix
191 sp_line_set_transform (SPItem *item, NR::Matrix const &xform)
192 {
193 SPLine *line = SP_LINE (item);
194 NR::Point points[2];
196 points[0] = NR::Point(line->x1.computed, line->y1.computed);
197 points[1] = NR::Point(line->x2.computed, line->y2.computed);
199 points[0] *= xform;
200 points[1] *= xform;
202 line->x1.computed = points[0][NR::X];
203 line->y1.computed = points[0][NR::Y];
204 line->x2.computed = points[1][NR::X];
205 line->y2.computed = points[1][NR::Y];
207 sp_item_adjust_stroke(item, NR::expansion(xform));
209 SP_OBJECT (item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
211 return NR::identity();
212 }
214 static void
215 sp_line_set_shape (SPShape *shape)
216 {
217 SPLine *line = SP_LINE (shape);
219 SPCurve *c = sp_curve_new ();
221 sp_curve_moveto (c, line->x1.computed, line->y1.computed);
222 sp_curve_lineto (c, line->x2.computed, line->y2.computed);
224 sp_shape_set_curve_insync (shape, c, TRUE); // *_insync does not call update, avoiding infinite recursion when set_shape is called by update
226 sp_curve_unref (c);
227 }