1 #define __SP_3DBOX_FACE_C__
3 /*
4 * Face of a 3D box ('perspectivic rectangle')
5 *
6 * Authors:
7 * Maximilian Albert <Anhalter42@gmx.de>
8 *
9 * Copyright (C) 2007 authors
10 *
11 * Released under GNU GPL, read the file 'COPYING' for more information
12 */
14 #include "svg/svg.h"
15 #include "box3d-face.h"
16 #include "prefs-utils.h"
18 // FIXME: It's quite redundant to pass the box plus the corners plus the axes. At least the corners can
19 // theoretically be reconstructed from the box and the axes, but in order to do this we need
20 // access to box->corners, which is not possible if we only have a forward declaration of SP3DBox
21 // in box3d-face.h. (But we can't include box3d.h itself because the latter already includes
22 // box3d-face.h).
23 Box3DFace::Box3DFace(SP3DBox *box, NR::Point &A, NR::Point &B, NR::Point &C, NR::Point &D,
24 Box3D::Axis plane, Box3D::FrontOrRear rel_pos)
25 : front_or_rear (rel_pos), path (NULL), parent_box3d (box)
26 {
27 dir1 = extract_first_axis_direction (plane);
28 dir2 = extract_second_axis_direction (plane);
29 /*
30 Box3D::Axis axis = (rel_pos == Box3D::FRONT ? Box3D::NONE : Box3D::third_axis_direction (plane));
31 set_corners (box->corners[axis],
32 box->corners[axis ^ dir1],
33 box->corners[axis ^ dir1 ^ dir2],
34 box->corners[axis ^ dir2]);
35 */
36 set_corners (A, B, C, D);
37 }
39 Box3DFace::~Box3DFace()
40 {
41 for (int i = 0; i < 4; ++i) {
42 if (this->corners[i]) {
43 //delete this->corners[i];
44 this->corners[i] = NULL;
45 }
46 }
47 }
49 void Box3DFace::set_corners(NR::Point &A, NR::Point &B, NR::Point &C, NR::Point &D)
50 {
51 corners[0] = &A;
52 corners[1] = &B;
53 corners[2] = &C;
54 corners[3] = &D;
55 }
57 /***
58 void Box3DFace::set_shape(NR::Point const ul, NR::Point const lr,
59 Box3D::Axis const dir1, Box3D::Axis const dir2,
60 unsigned int shift_count, NR::Maybe<NR::Point> pt_align, bool align_along_PL)
61 {
62 corners[0] = ul;
63 if (!pt_align) {
64 corners[2] = lr;
65 } else {
66 if (align_along_PL) {
67 Box3D::Axis dir3 = Box3D::third_axis_direction (dir1, dir2);
68 Box3D::Line line1(*Box3D::Perspective3D::current_perspective->get_vanishing_point(dir1), lr);
69 Box3D::Line line2(*pt_align, *Box3D::Perspective3D::current_perspective->get_vanishing_point(dir3));
70 corners[2] = *line1.intersect(line2);
71 } else {
72 corners[2] = Box3D::Line(*pt_align, *Box3D::Perspective3D::current_perspective->get_vanishing_point(dir1)).closest_to(lr);
73 }
74 }
76 Box3D::PerspectiveLine first_line (corners[0], dir1);
77 Box3D::PerspectiveLine second_line (corners[2], dir2);
78 NR::Maybe<NR::Point> ur = first_line.intersect(second_line);
80 Box3D::PerspectiveLine third_line (corners[0], dir2);
81 Box3D::PerspectiveLine fourth_line (corners[2], dir1);
82 NR::Maybe<NR::Point> ll = third_line.intersect(fourth_line);
84 // FIXME: How to handle the case if one of the intersections doesn't exist?
85 // Maybe set them equal to the corresponding VPs?
86 if (!ur) ur = NR::Point(0.0, 0.0);
87 if (!ll) ll = NR::Point(0.0, 0.0);
89 corners[1] = *ll;
90 corners[3] = *ur;
92 this->dir1 = dir1;
93 this->dir2 = dir2;
95 // FIXME: Can be made more concise
96 NR::Point tmp_pt;
97 for (unsigned int i=0; i < shift_count; i++) {
98 tmp_pt = corners[3];
99 corners[1] = corners[0];
100 corners[2] = corners[1];
101 corners[3] = corners[2];
102 corners[0] = tmp_pt;
103 }
104 }
105 ***/
107 Box3DFace::Box3DFace(Box3DFace const &box3dface)
108 {
109 for (int i = 0; i < 4; ++i) {
110 this->corners[i] = box3dface.corners[i];
111 }
112 this->dir1 = box3dface.dir1;
113 this->dir2 = box3dface.dir2;
114 }
116 /**
117 * Construct a 3D box face with opposite corners A and C whose sides are directed
118 * along axis1 and axis2. The corners have the following order:
119 *
120 * A = corners[0] --> along axis1 --> B = corners[1] --> along axis2 --> C = corners[2]
121 * --> along axis1 --> D = corners[3] --> along axis2 --> D = corners[0].
122 *
123 * Note that several other functions rely on this precise order.
124 */
125 /***
126 void
127 Box3DFace::set_face (NR::Point const A, NR::Point const C, Box3D::Axis const axis1, Box3D::Axis const axis2)
128 {
129 *corners[0] = A;
130 *corners[2] = C;
131 if (!SP_IS_3DBOX_CONTEXT(inkscape_active_event_context()))
132 return;
133 SP3DBoxContext *bc = SP_3DBOX_CONTEXT(inkscape_active_event_context());
135 Box3D::PerspectiveLine line1 (A, axis1, Box3D::Perspective3D::current_perspective);
136 Box3D::PerspectiveLine line2 (C, axis2, Box3D::Perspective3D::current_perspective);
137 NR::Maybe<NR::Point> B = line1.intersect(line2);
139 Box3D::PerspectiveLine line3 (*corners[0], axis2, Box3D::Perspective3D::current_perspective);
140 Box3D::PerspectiveLine line4 (*corners[2], axis1, Box3D::Perspective3D::current_perspective);
141 NR::Maybe<NR::Point> D = line3.intersect(line4);
143 // FIXME: How to handle the case if one of the intersections doesn't exist?
144 // Maybe set them equal to the corresponding VPs?
145 if (!D) D = NR::Point(0.0, 0.0);
146 if (!B) B = NR::Point(0.0, 0.0);
148 *corners[1] = *B;
149 *corners[3] = *D;
151 this->dir1 = axis1;
152 this->dir2 = axis2;
153 }
154 ***/
156 NR::Point Box3DFace::operator[](unsigned int i)
157 {
158 return *corners[i % 4];
159 }
163 /**
164 * Append the curve's path as a child to the given 3D box (since SP3DBox
165 * is derived from SPGroup, so we can append children to its svg representation)
166 */
167 void Box3DFace::hook_path_to_3dbox(SPPath * existing_path)
168 {
169 if (this->path) {
170 //g_print ("Path already exists. Returning ...\n");
171 return;
172 }
174 if (existing_path != NULL) {
175 // no need to create a new path
176 this->path = existing_path;
177 return;
178 }
180 /* create new path for face */
181 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_OBJECT_DOCUMENT(SP_OBJECT(parent_box3d)));
183 Inkscape::XML::Node *repr_face = xml_doc->createElement("svg:path");
184 repr_face->setAttribute("inkscape:box3dface", this->axes_string());
185 this->path = SP_PATH(SP_OBJECT(parent_box3d)->appendChildRepr(repr_face));
186 Inkscape::GC::release(repr_face);
188 /* set the correct style */
189 this->set_style (repr_face);
190 }
192 void Box3DFace::set_style(Inkscape::XML::Node *repr_face, bool extruded)
193 {
194 if (repr_face == NULL) {
195 repr_face = SP_OBJECT_REPR (this->path);
196 }
198 if (!extruded && !strcmp (axes_string (), "XYrear")) {
199 // to avoid "flashing" during the initial dragging process, we make the rear face invisible in this case
200 repr_face->setAttribute("style", "fill:none");
201 return;
202 }
204 gchar *descr = g_strconcat ("desktop.", axes_string (), NULL);
205 const gchar * cur_style = prefs_get_string_attribute(descr, "style");
206 g_free (descr);
208 SPDesktop *desktop = inkscape_active_desktop();
209 bool use_current = prefs_get_int_attribute("tools.shapes.3dbox", "usecurrent", 0);
210 if (use_current && cur_style !=NULL) {
211 /* use last used style */
212 repr_face->setAttribute("style", cur_style);
213 } else {
214 /* use default style */
215 GString *pstring = g_string_new("");
216 g_string_printf (pstring, "tools.shapes.3dbox.%s", axes_string());
217 sp_desktop_apply_style_tool (desktop, repr_face, pstring->str, false);
218 }
219 }
221 /**
222 * Write the path's "d" attribute to the SVG representation.
223 */
224 void Box3DFace::set_path_repr()
225 {
226 NR::Matrix const i2d (sp_item_i2d_affine (SP_ITEM (this->parent_box3d)));
227 SPCurve * curve = sp_curve_new();
228 sp_curve_moveto (curve, ((*corners[0]) * i2d)[NR::X], ((*corners[0]) * i2d)[NR::Y]);
229 sp_curve_lineto (curve, ((*corners[1]) * i2d)[NR::X], ((*corners[1]) * i2d)[NR::Y]);
230 sp_curve_lineto (curve, ((*corners[2]) * i2d)[NR::X], ((*corners[2]) * i2d)[NR::Y]);
231 sp_curve_lineto (curve, ((*corners[3]) * i2d)[NR::X], ((*corners[3]) * i2d)[NR::Y]);
232 sp_curve_closepath (curve);
233 SP_OBJECT(this->path)->repr->setAttribute("d", sp_svg_write_path (SP_CURVE_BPATH(curve)));
234 }
236 void Box3DFace::set_curve()
237 {
238 if (this->path == NULL) {
239 g_warning("this->path is NULL! \n");
240 return;
241 }
242 NR::Matrix const i2d (sp_item_i2d_affine (SP_ITEM (this->parent_box3d)));
243 SPCurve *curve = sp_curve_new();
244 sp_curve_moveto(curve, (*corners[0]) * i2d);
245 sp_curve_lineto(curve, (*corners[1]) * i2d);
246 sp_curve_lineto(curve, (*corners[2]) * i2d);
247 sp_curve_lineto(curve, (*corners[3]) * i2d);
248 sp_curve_closepath(curve);
249 sp_shape_set_curve(SP_SHAPE(this->path), curve, true);
250 sp_curve_unref(curve);
251 }
253 gchar * Box3DFace::axes_string()
254 {
255 GString *pstring = g_string_new("");
256 g_string_printf (pstring, "%s", Box3D::string_from_axes ((Box3D::Axis) (dir1 ^ dir2)));
257 switch ((Box3D::Axis) (dir1 ^ dir2)) {
258 case Box3D::XY:
259 g_string_append_printf (pstring, (front_or_rear == Box3D::FRONT) ? "front" : "rear");
260 break;
261 case Box3D::XZ:
262 g_string_append_printf (pstring, (front_or_rear == Box3D::FRONT) ? "top" : "bottom");
263 break;
264 case Box3D::YZ:
265 g_string_append_printf (pstring, (front_or_rear == Box3D::FRONT) ? "right" : "left");
266 break;
267 default:
268 break;
269 }
270 return pstring->str;
271 }
273 gint Box3DFace::descr_to_id (gchar const *descr)
274 {
275 if (!strcmp (descr, "XYrear")) { return 5; }
276 if (!strcmp (descr, "XYfront")) { return 4; }
277 if (!strcmp (descr, "XZbottom")) { return 3; }
278 if (!strcmp (descr, "XZtop")) { return 2; }
279 if (!strcmp (descr, "YZleft")) { return 1; }
280 if (!strcmp (descr, "YZright")) { return 0; }
282 g_warning ("Invalid description of 3D box face.\n");
283 return -1;
284 }
286 /*
287 Local Variables:
288 mode:c++
289 c-file-style:"stroustrup"
290 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
291 indent-tabs-mode:nil
292 fill-column:99
293 End:
294 */
295 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :