diff options
Diffstat (limited to 'src/box3d-face.cpp')
| -rw-r--r-- | src/box3d-face.cpp | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/box3d-face.cpp b/src/box3d-face.cpp new file mode 100644 index 000000000..eb05b2c04 --- /dev/null +++ b/src/box3d-face.cpp @@ -0,0 +1,161 @@ +#define __SP_3DBOX_FACE_C__ + +/* + * Face of a 3D box ('perspectivic rectangle') + * + * Authors: + * Maximilian Albert <Anhalter42@gmx.de> + * + * Copyright (C) 2007 authors + * + * Released under GNU GPL, read the file 'COPYING' for more information + */ + +#include "box3d-face.h" +#include <iostream> + +Box3DFace::Box3DFace(SP3DBox *box3d) : corner1 (0, 0), corner2 (0, 0), corner3 (0, 0), corner4 (0, 0), + dir1 (Box3D::NONE), dir2 (Box3D::NONE), path (NULL), parent_box3d (box3d) +{ +} + +void Box3DFace::set_shape(NR::Point const ul, NR::Point const lr, + Box3D::PerspDir const dir1, Box3D::PerspDir const dir2, + unsigned int shift_count, NR::Maybe<NR::Point> pt_align, bool align_along_PL) +{ + corner1 = ul; + if (!pt_align) { + corner3 = lr; + } else { + if (align_along_PL) { + Box3D::PerspDir dir3; + if (dir1 == Box3D::X && dir2 == Box3D::Y) dir3 = Box3D::Z; + if (dir1 == Box3D::X && dir2 == Box3D::Z) dir3 = Box3D::Y; + if (dir1 == Box3D::Y && dir2 == Box3D::X) dir3 = Box3D::Z; + if (dir1 == Box3D::Y && dir2 == Box3D::Z) dir3 = Box3D::X; + if (dir1 == Box3D::Z && dir2 == Box3D::X) dir3 = Box3D::Y; + if (dir1 == Box3D::Z && dir2 == Box3D::Y) dir3 = Box3D::X; + Box3D::Line line1(*SP3DBoxContext::current_perspective->get_vanishing_point(dir1), lr); + Box3D::Line line2(*pt_align, *SP3DBoxContext::current_perspective->get_vanishing_point(dir3)); + corner3 = *line1.intersect(line2); + } else { + corner3 = Box3D::Line(*pt_align, *SP3DBoxContext::current_perspective->get_vanishing_point(dir1)).closest_to(lr); + } + } + + Box3D::PerspectiveLine first_line (corner1, dir1); + Box3D::PerspectiveLine second_line (corner3, dir2); + NR::Maybe<NR::Point> ur = first_line.intersect(second_line); + + Box3D::PerspectiveLine third_line (corner1, dir2); + Box3D::PerspectiveLine fourth_line (corner3, dir1); + NR::Maybe<NR::Point> ll = third_line.intersect(fourth_line); + + // FIXME: How to handle the case if one of the intersections doesn't exist? + // Maybe set them equal to the corresponding VPs? + if (!ur) ur = NR::Point(0.0, 0.0); + if (!ll) ll = NR::Point(0.0, 0.0); + + corner2 = *ll; + corner4 = *ur; + + this->dir1 = dir1; + this->dir2 = dir2; + + // FIXME: More effective with array of corners + NR::Point tmp_pt; + for (unsigned int i=0; i < shift_count; i++) { + tmp_pt = corner4; + corner2 = corner1; + corner3 = corner2; + corner4 = corner3; + corner1 = tmp_pt; + } +} + +Box3DFace::Box3DFace(Box3DFace const &box3dface) +{ + this->corner1 = box3dface.corner1; + this->corner2 = box3dface.corner2; + this->corner3 = box3dface.corner3; + this->corner4 = box3dface.corner4; + this->dir1 = box3dface.dir1; + this->dir2 = box3dface.dir2; +} + +NR::Point Box3DFace::operator[](unsigned int i) +{ + unsigned int index = i % 4; + switch (index) { + case 0: return corner1; break; + case 1: return corner2; break; + case 2: return corner3; break; + case 3: return corner4; break; + } + // The following two lines are just to prevent a compiler warning ("control reaches + // end of non-void function); they can be removed if desired + g_message ("Error: This code line hould not be reached\n"); + return NR::Point (0, 0); +} + +/** + * Append the curve's path as a child to the given 3D box (since SP3DBox + * is derived from SPGroup, so we can append children to its svg representation) + */ +void Box3DFace::hook_path_to_3dbox() +{ + SPDesktop *desktop = inkscape_active_desktop(); + Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_EVENT_CONTEXT_DOCUMENT(inkscape_active_event_context())); + Inkscape::XML::Node *repr_face = xml_doc->createElement("svg:path"); + sp_desktop_apply_style_tool (desktop, repr_face, "tools.shapes.3dbox", false); + this->path = SP_PATH(SP_OBJECT(parent_box3d)->appendChildRepr(repr_face)); + Inkscape::GC::release(repr_face); +} + +/** + * Write the path's "d" attribute to the SVG representation. + */ +void Box3DFace::set_path_repr() +{ + SP_OBJECT(this->path)->repr->setAttribute("d", svg_repr_string()); +} + +void Box3DFace::set_curve() +{ + SPDocument *doc = SP_OBJECT_DOCUMENT(this->parent_box3d); + gdouble height = sp_document_height(doc); + + SPCurve *curve = sp_curve_new(); + sp_curve_moveto(curve, corner1[NR::X], height - corner1[NR::Y]); + sp_curve_lineto(curve, corner2[NR::X], height - corner2[NR::Y]); + sp_curve_lineto(curve, corner3[NR::X], height - corner3[NR::Y]); + sp_curve_lineto(curve, corner4[NR::X], height - corner4[NR::Y]); + sp_curve_closepath(curve); + sp_shape_set_curve(SP_SHAPE(this->path), curve, true); + sp_curve_unref(curve); +} + +gchar * Box3DFace::svg_repr_string() +{ + SPDocument *doc = SP_OBJECT_DOCUMENT(this->parent_box3d); + gdouble height = sp_document_height(doc); + + GString *pstring = g_string_new(""); + g_string_sprintf (pstring, "M %f,%f L %f,%f L %f,%f L %f,%f z", + corner1[NR::X], height - corner1[NR::Y], + corner2[NR::X], height - corner2[NR::Y], + corner3[NR::X], height - corner3[NR::Y], + corner4[NR::X], height - corner4[NR::Y]); + return pstring->str; +} + +/* + 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 : |