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#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) : dir1 (Box3D::NONE), dir2 (Box3D::NONE), path (NULL), parent_box3d (box3d)
{
for (int i = 0; i < 4; ++i) {
this->corners[i] = NR::Point(0, 0);
}
}
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)
{
corners[0] = ul;
if (!pt_align) {
corners[2] = lr;
} else {
if (align_along_PL) {
Box3D::PerspDir dir3 = Box3D::third_axis_direction (dir1, dir2);
Box3D::Line line1(*SP3DBoxContext::current_perspective->get_vanishing_point(dir1), lr);
Box3D::Line line2(*pt_align, *SP3DBoxContext::current_perspective->get_vanishing_point(dir3));
corners[2] = *line1.intersect(line2);
} else {
corners[2] = Box3D::Line(*pt_align, *SP3DBoxContext::current_perspective->get_vanishing_point(dir1)).closest_to(lr);
}
}
Box3D::PerspectiveLine first_line (corners[0], dir1);
Box3D::PerspectiveLine second_line (corners[2], dir2);
NR::Maybe<NR::Point> ur = first_line.intersect(second_line);
Box3D::PerspectiveLine third_line (corners[0], dir2);
Box3D::PerspectiveLine fourth_line (corners[2], 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);
corners[1] = *ll;
corners[3] = *ur;
this->dir1 = dir1;
this->dir2 = dir2;
// FIXME: Can be made more concise
NR::Point tmp_pt;
for (unsigned int i=0; i < shift_count; i++) {
tmp_pt = corners[3];
corners[1] = corners[0];
corners[2] = corners[1];
corners[3] = corners[2];
corners[0] = tmp_pt;
}
}
Box3DFace::Box3DFace(Box3DFace const &box3dface)
{
for (int i = 0; i < 4; ++i) {
this->corners[i] = box3dface.corners[i];
}
this->dir1 = box3dface.dir1;
this->dir2 = box3dface.dir2;
}
NR::Point Box3DFace::operator[](unsigned int i)
{
return corners[i % 4];
}
/**
* 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, corners[0][NR::X], height - corners[0][NR::Y]);
sp_curve_lineto(curve, corners[1][NR::X], height - corners[1][NR::Y]);
sp_curve_lineto(curve, corners[2][NR::X], height - corners[2][NR::Y]);
sp_curve_lineto(curve, corners[3][NR::X], height - corners[3][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",
corners[0][NR::X], height - corners[0][NR::Y],
corners[1][NR::X], height - corners[1][NR::Y],
corners[2][NR::X], height - corners[2][NR::Y],
corners[3][NR::X], height - corners[3][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 :
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