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Diffstat (limited to 'src/object/persp3d.cpp')
| -rw-r--r-- | src/object/persp3d.cpp | 605 |
1 files changed, 605 insertions, 0 deletions
diff --git a/src/object/persp3d.cpp b/src/object/persp3d.cpp new file mode 100644 index 0000000..58a6d8a --- /dev/null +++ b/src/object/persp3d.cpp @@ -0,0 +1,605 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Class modelling a 3D perspective as an SPObject + * + * Authors: + * Maximilian Albert <Anhalter42@gmx.de> + * Jon A. Cruz <jon@joncruz.org> + * Abhishek Sharma + * + * Copyright (C) 2007 authors + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include "persp3d.h" + +#include <glibmm/i18n.h> + + +#include "attributes.h" +#include "box3d.h" +#include "desktop.h" +#include "document-undo.h" +#include "perspective-line.h" +#include "sp-defs.h" +#include "sp-root.h" +#include "vanishing-point.h" + +#include "svg/stringstream.h" +#include "ui/icon-names.h" +#include "ui/tools/box3d-tool.h" +#include "util/units.h" +#include "xml/node-event-vector.h" + +using Inkscape::DocumentUndo; + +static void persp3d_on_repr_attr_changed (Inkscape::XML::Node * repr, const gchar *key, const gchar *oldval, const gchar *newval, bool is_interactive, void * data); + +static int global_counter = 0; + +/* Constructor/destructor for the internal class */ + +Persp3DImpl::Persp3DImpl() : + tmat (Proj::TransfMat3x4 ()), + document (nullptr) +{ + my_counter = global_counter++; +} + +static Inkscape::XML::NodeEventVector const persp3d_repr_events = { + nullptr, /* child_added */ + nullptr, /* child_removed */ + persp3d_on_repr_attr_changed, + nullptr, /* content_changed */ + nullptr /* order_changed */ +}; + + +Persp3D::Persp3D() : SPObject() { + this->perspective_impl = new Persp3DImpl(); +} + +Persp3D::~Persp3D() = default; + + +/** + * Virtual build: set persp3d attributes from its associated XML node. + */ +void Persp3D::build(SPDocument *document, Inkscape::XML::Node *repr) { + SPObject::build(document, repr); + + this->readAttr(SPAttr::INKSCAPE_PERSP3D_VP_X); + this->readAttr(SPAttr::INKSCAPE_PERSP3D_VP_Y); + this->readAttr(SPAttr::INKSCAPE_PERSP3D_VP_Z); + this->readAttr(SPAttr::INKSCAPE_PERSP3D_ORIGIN); + + if (repr) { + repr->addListener (&persp3d_repr_events, this); + } +} + +/** + * Virtual release of Persp3D members before destruction. + */ +void Persp3D::release() { + delete this->perspective_impl; + this->getRepr()->removeListenerByData(this); +} + +/** + * Apply viewBox and legacy desktop transformation to point loaded from SVG + */ +static Proj::Pt2 legacy_transform_forward(Proj::Pt2 pt, SPDocument const *doc) { + // Read values are in 'user units'. + auto root = doc->getRoot(); + if (root->viewBox_set) { + pt[0] *= root->width.computed / root->viewBox.width(); + pt[1] *= root->height.computed / root->viewBox.height(); + } + + // <inkscape:perspective> stores inverted y-axis coordinates + if (doc->is_yaxisdown()) { + pt[1] *= -1; + if (pt[2]) { + pt[1] += doc->getHeight().value("px"); + } + } + + return pt; +} + +/** + * Apply viewBox and legacy desktop transformation to point to be written to SVG + */ +static Proj::Pt2 legacy_transform_backward(Proj::Pt2 pt, SPDocument const *doc) { + // <inkscape:perspective> stores inverted y-axis coordinates + if (doc->is_yaxisdown()) { + pt[1] *= -1; + if (pt[2]) { + pt[1] += doc->getHeight().value("px"); + } + } + + // Written values are in 'user units'. + auto root = doc->getRoot(); + if (root->viewBox_set) { + pt[0] *= root->viewBox.width() / root->width.computed; + pt[1] *= root->viewBox.height() / root->height.computed; + } + + return pt; +} + +/** + * Virtual set: set attribute to value. + */ +// FIXME: Currently we only read the finite positions of vanishing points; +// should we move VPs into their own repr (as it's done for SPStop, e.g.)? +void Persp3D::set(SPAttr key, gchar const *value) { + + switch (key) { + case SPAttr::INKSCAPE_PERSP3D_VP_X: { + if (value) { + Proj::Pt2 pt (value); + Proj::Pt2 ptn = legacy_transform_forward(pt, document); + perspective_impl->tmat.set_image_pt( Proj::X, ptn ); + } + break; + } + case SPAttr::INKSCAPE_PERSP3D_VP_Y: { + if (value) { + Proj::Pt2 pt (value); + Proj::Pt2 ptn = legacy_transform_forward(pt, document); + perspective_impl->tmat.set_image_pt( Proj::Y, ptn ); + } + break; + } + case SPAttr::INKSCAPE_PERSP3D_VP_Z: { + if (value) { + Proj::Pt2 pt (value); + Proj::Pt2 ptn = legacy_transform_forward(pt, document); + perspective_impl->tmat.set_image_pt( Proj::Z, ptn ); + } + break; + } + case SPAttr::INKSCAPE_PERSP3D_ORIGIN: { + if (value) { + Proj::Pt2 pt (value); + Proj::Pt2 ptn = legacy_transform_forward(pt, document); + perspective_impl->tmat.set_image_pt( Proj::W, ptn ); + } + break; + } + default: { + SPObject::set(key, value); + break; + } + } + + // FIXME: Is this the right place for resetting the draggers? PROBABLY NOT! + if (!SP_ACTIVE_DESKTOP) { + // Maybe in commandline mode. + return; + } + + Inkscape::UI::Tools::ToolBase *ec = SP_ACTIVE_DESKTOP->getEventContext(); + if (SP_IS_BOX3D_CONTEXT(ec)) { + Inkscape::UI::Tools::Box3dTool *bc = SP_BOX3D_CONTEXT(ec); + bc->_vpdrag->updateDraggers(); + bc->_vpdrag->updateLines(); + bc->_vpdrag->updateBoxHandles(); + bc->_vpdrag->updateBoxReprs(); + } +} + +void Persp3D::update(SPCtx *ctx, guint flags) { + if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) { + + /* TODO: Should we update anything here? */ + + } + + SPObject::update(ctx, flags); +} + +Persp3D * +Persp3D::create_xml_element(SPDocument *document) { + SPDefs *defs = document->getDefs(); + Inkscape::XML::Document *xml_doc = document->getReprDoc(); + Inkscape::XML::Node *repr; + + /* if no perspective is given, create a default one */ + repr = xml_doc->createElement("inkscape:perspective"); + repr->setAttribute("sodipodi:type", "inkscape:persp3d"); + + // Use 'user-units' + double width = document->getWidth().value("px"); + double height = document->getHeight().value("px"); + if( document->getRoot()->viewBox_set ) { + Geom::Rect vb = document->getRoot()->viewBox; + width = vb.width(); + height = vb.height(); + } + + Proj::Pt2 proj_vp_x = Proj::Pt2 (0.0, height/2.0, 1.0); + Proj::Pt2 proj_vp_y = Proj::Pt2 (0.0, 1000.0, 0.0); + Proj::Pt2 proj_vp_z = Proj::Pt2 (width, height/2.0, 1.0); + Proj::Pt2 proj_origin = Proj::Pt2 (width/2.0, height/3.0, 1.0 ); + + gchar *str = nullptr; + str = proj_vp_x.coord_string(); + repr->setAttribute("inkscape:vp_x", str); + g_free (str); + str = proj_vp_y.coord_string(); + repr->setAttribute("inkscape:vp_y", str); + g_free (str); + str = proj_vp_z.coord_string(); + repr->setAttribute("inkscape:vp_z", str); + g_free (str); + str = proj_origin.coord_string(); + repr->setAttribute("inkscape:persp3d-origin", str); + g_free (str); + + /* Append the new persp3d to defs */ + defs->getRepr()->addChild(repr, nullptr); + Inkscape::GC::release(repr); + + return reinterpret_cast<Persp3D *>( defs->get_child_by_repr(repr) ); +} + +Persp3D * +Persp3D::document_first_persp(SPDocument *document) +{ + Persp3D *first = nullptr; + for (auto& child: document->getDefs()->children) { + if (SP_IS_PERSP3D(&child)) { + first = SP_PERSP3D(&child); + break; + } + } + return first; +} + +/** + * Virtual write: write object attributes to repr. + */ +Inkscape::XML::Node* Persp3D::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) { + + if ((flags & SP_OBJECT_WRITE_BUILD & SP_OBJECT_WRITE_EXT) && !repr) { + // this is where we end up when saving as plain SVG (also in other circumstances?); + // hence we don't set the sodipodi:type attribute + repr = xml_doc->createElement("inkscape:perspective"); + } + + if (flags & SP_OBJECT_WRITE_EXT) { + { + Proj::Pt2 pt = perspective_impl->tmat.column( Proj::X ); + Inkscape::SVGOStringStream os; + pt = legacy_transform_backward(pt, document); + os << pt[0] << " : " << pt[1] << " : " << pt[2]; + repr->setAttribute("inkscape:vp_x", os.str()); + } + { + Proj::Pt2 pt = perspective_impl->tmat.column( Proj::Y ); + Inkscape::SVGOStringStream os; + pt = legacy_transform_backward(pt, document); + os << pt[0] << " : " << pt[1] << " : " << pt[2]; + repr->setAttribute("inkscape:vp_y", os.str()); + } + { + Proj::Pt2 pt = perspective_impl->tmat.column( Proj::Z ); + Inkscape::SVGOStringStream os; + pt = legacy_transform_backward(pt, document); + os << pt[0] << " : " << pt[1] << " : " << pt[2]; + repr->setAttribute("inkscape:vp_z", os.str()); + } + { + Proj::Pt2 pt = perspective_impl->tmat.column( Proj::W ); + Inkscape::SVGOStringStream os; + pt = legacy_transform_backward(pt, document); + os << pt[0] << " : " << pt[1] << " : " << pt[2]; + repr->setAttribute("inkscape:persp3d-origin", os.str()); + } + } + + SPObject::write(xml_doc, repr, flags); + + return repr; +} + +/* convenience wrapper around Persp3D::get_finite_dir() and Persp3D::get_infinite_dir() */ +Geom::Point +Persp3D::get_PL_dir_from_pt (Geom::Point const &pt, Proj::Axis axis) const { + if (Persp3D::VP_is_finite(this->perspective_impl, axis)) { + return this->get_finite_dir(pt, axis); + } else { + return this->get_infinite_dir(axis); + } +} + +Geom::Point +Persp3D::get_finite_dir (Geom::Point const &pt, Proj::Axis axis) const { + Box3D::PerspectiveLine pl(pt, axis, this); + return pl.direction(); +} + +Geom::Point +Persp3D::get_infinite_dir (Proj::Axis axis) const { + Proj::Pt2 vp(this->get_VP(axis)); + if (vp[2] != 0.0) { + g_print ("VP should be infinite but is (%f : %f : %f)\n", vp[0], vp[1], vp[2]); + g_return_val_if_fail(vp[2] != 0.0, Geom::Point(0.0, 0.0)); + } + return Geom::Point(vp[0], vp[1]); +} + +double +Persp3D::get_infinite_angle (Proj::Axis axis) const { + return this->perspective_impl->tmat.get_infinite_angle(axis); +} + +bool +Persp3D::VP_is_finite (Persp3DImpl *persp_impl, Proj::Axis axis) { + return persp_impl->tmat.has_finite_image(axis); +} + +void +Persp3D::toggle_VP (Proj::Axis axis, bool set_undo) { + this->perspective_impl->tmat.toggle_finite(axis); + // FIXME: Remove this repr update and rely on vp_drag_sel_modified() to do this for us + // On the other hand, vp_drag_sel_modified() would update all boxes; + // here we can confine ourselves to the boxes of this particular perspective. + this->update_box_reprs(); + this->updateRepr(SP_OBJECT_WRITE_EXT); + if (set_undo) { + DocumentUndo::done(SP_ACTIVE_DESKTOP->getDocument(), _("Toggle vanishing point"), INKSCAPE_ICON("draw-cuboid")); + } +} + +/* toggle VPs for the same axis in all perspectives of a given list */ +void +Persp3D::toggle_VPs (std::list<Persp3D *> list, Proj::Axis axis) { + for (Persp3D *persp : list) { + persp->toggle_VP(axis, false); + } + DocumentUndo::done(SP_ACTIVE_DESKTOP->getDocument(), _("Toggle multiple vanishing points"), INKSCAPE_ICON("draw-cuboid")); +} + +void +Persp3D::set_VP_state (Proj::Axis axis, Proj::VPState state) { + if (Persp3D::VP_is_finite(this->perspective_impl, axis) != (state == Proj::VP_FINITE)) { + this->toggle_VP(axis); + } +} + +void +Persp3D::rotate_VP (Proj::Axis axis, double angle, bool alt_pressed) { // angle is in degrees + // FIXME: Most of this functionality should be moved to trans_mat_3x4.(h|cpp) + if (this->perspective_impl->tmat.has_finite_image(axis)) { + // don't rotate anything for finite VPs + return; + } + Proj::Pt2 v_dir_proj (this->perspective_impl->tmat.column(axis)); + Geom::Point v_dir (v_dir_proj[0], v_dir_proj[1]); + double a = Geom::atan2 (v_dir) * 180/M_PI; + a += alt_pressed ? 0.5 * ((angle > 0 ) - (angle < 0)) : angle; // the r.h.s. yields +/-0.5 or angle + this->perspective_impl->tmat.set_infinite_direction (axis, a); + + this->update_box_reprs (); + this->updateRepr(SP_OBJECT_WRITE_EXT); +} + +void +Persp3D::apply_affine_transformation (Geom::Affine const &xform) { + this->perspective_impl->tmat *= xform; + this->update_box_reprs(); + this->updateRepr(SP_OBJECT_WRITE_EXT); +} + +void +Persp3D::add_box (SPBox3D *box) { + Persp3DImpl *persp_impl = this->perspective_impl; + + if (!box) { + return; + } + if (std::find (persp_impl->boxes.begin(), persp_impl->boxes.end(), box) != persp_impl->boxes.end()) { + return; + } + persp_impl->boxes.push_back(box); +} + +void +Persp3D::remove_box (SPBox3D *box) { + Persp3DImpl *persp_impl = this->perspective_impl; + + std::vector<SPBox3D *>::iterator i = std::find (persp_impl->boxes.begin(), persp_impl->boxes.end(), box); + if (i != persp_impl->boxes.end()) + persp_impl->boxes.erase(i); +} + +bool +Persp3D::has_box (SPBox3D *box) const { + Persp3DImpl *persp_impl = this->perspective_impl; + + // FIXME: For some reason, std::find() does not seem to compare pointers "correctly" (or do we need to + // provide a proper comparison function?), so we manually traverse the list. + for (auto & boxe : persp_impl->boxes) { + if (boxe == box) { + return true; + } + } + return false; +} + +void +Persp3D::update_box_displays () { + Persp3DImpl *persp_impl = this->perspective_impl; + + if (persp_impl->boxes.empty()) + return; + for (auto & boxe : persp_impl->boxes) { + boxe->position_set(); + } +} + +void +Persp3D::update_box_reprs () { + Persp3DImpl *persp_impl = this->perspective_impl; + + if (!persp_impl || persp_impl->boxes.empty()) + return; + for (auto & boxe : persp_impl->boxes) { + boxe->updateRepr(SP_OBJECT_WRITE_EXT); + boxe->set_z_orders(); + } +} + +void +Persp3D::update_z_orders () { + Persp3DImpl *persp_impl = this->perspective_impl; + + if (!persp_impl || persp_impl->boxes.empty()) + return; + for (auto & boxe : persp_impl->boxes) { + boxe->set_z_orders(); + } +} + +// FIXME: For some reason we seem to require a vector instead of a list in Persp3D, but in vp_knot_moved_handler() +// we need a list of boxes. If we can store a list in Persp3D right from the start, this function becomes +// obsolete. We should do this. +std::list<SPBox3D *> +Persp3D::list_of_boxes() const { + Persp3DImpl *persp_impl = this->perspective_impl; + + std::list<SPBox3D *> bx_lst; + for (auto & boxe : persp_impl->boxes) { + bx_lst.push_back(boxe); + } + return bx_lst; +} + +bool +Persp3D::perspectives_coincide(const Persp3D *other) const +{ + return this->perspective_impl->tmat == other->perspective_impl->tmat; +} + +void +Persp3D::absorb(Persp3D *other) { + /* double check if we are called in sane situations */ + g_return_if_fail (this->perspectives_coincide(other) && this != other); + + // Note: We first need to copy the boxes of other into a separate list; + // otherwise the loop below gets confused when perspectives are reattached. + std::list<SPBox3D *> boxes_of_persp2 = other->list_of_boxes(); + + for (auto & box : boxes_of_persp2) { + box->switch_perspectives(other, this, true); + box->updateRepr(SP_OBJECT_WRITE_EXT); // so that undo/redo can do its job properly + } +} + +static void +persp3d_on_repr_attr_changed ( Inkscape::XML::Node * /*repr*/, + const gchar */*key*/, + const gchar */*oldval*/, + const gchar */*newval*/, + bool /*is_interactive*/, + void * data ) +{ + if (!data) + return; + + Persp3D *persp = (Persp3D*) data; + persp->update_box_displays (); +} + +/* checks whether all boxes linked to this perspective are currently selected */ +bool +Persp3D::has_all_boxes_in_selection (Inkscape::ObjectSet *set) const { + Persp3DImpl *persp_impl = this->perspective_impl; + + std::list<SPBox3D *> selboxes = set->box3DList(); + + for (auto & boxe : persp_impl->boxes) { + if (std::find(selboxes.begin(), selboxes.end(), boxe) == selboxes.end()) { + // we have an unselected box in the perspective + return false; + } + } + return true; +} + +/* some debugging stuff follows */ + +void +Persp3D::print_debugging_info () const { + Persp3DImpl *persp_impl = this->perspective_impl; + g_print ("=== Info for Persp3D %d ===\n", persp_impl->my_counter); + gchar * cstr; + for (auto & axe : Proj::axes) { + cstr = this->get_VP(axe).coord_string(); + g_print (" VP %s: %s\n", Proj::string_from_axis(axe), cstr); + g_free(cstr); + } + cstr = this->get_VP(Proj::W).coord_string(); + g_print (" Origin: %s\n", cstr); + g_free(cstr); + + g_print (" Boxes: "); + for (auto & boxe : persp_impl->boxes) { + g_print ("%d (%d) ", boxe->my_counter, boxe->get_perspective()->perspective_impl->my_counter); + } + g_print ("\n"); + g_print ("========================\n"); +} + +void +Persp3D::print_debugging_info_all(SPDocument *document) +{ + for (auto& child: document->getDefs()->children) { + if (SP_IS_PERSP3D(&child)) { + SP_PERSP3D(&child)->print_debugging_info(); + } + } + Persp3D::print_all_selected(); +} + +void +Persp3D::print_all_selected() { + g_print ("\n======================================\n"); + g_print ("Selected perspectives and their boxes:\n"); + + std::list<Persp3D *> sel_persps = SP_ACTIVE_DESKTOP->getSelection()->perspList(); + + for (auto & sel_persp : sel_persps) { + Persp3D *persp = SP_PERSP3D(sel_persp); + Persp3DImpl *persp_impl = persp->perspective_impl; + g_print (" %s (%d): ", persp->getRepr()->attribute("id"), persp->perspective_impl->my_counter); + for (auto & boxe : persp_impl->boxes) { + g_print ("%d ", boxe->my_counter); + } + g_print ("\n"); + } + g_print ("======================================\n\n"); + } + +void print_current_persp3d(gchar *func_name, Persp3D *persp) { + g_print ("%s: current_persp3d is now %s\n", + func_name, + persp ? persp->getRepr()->attribute("id") : "NULL"); +} + +/* + 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:fileencoding=utf-8:textwidth=99 : |