src/modeleditcontext.cpp

/*
 *  LDForge: LDraw parts authoring CAD
 *  Copyright (C) 2013 - 2020 Teemu Piippo
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "modeleditcontext.h"

Model::EditContext::EditContext(Model& model) :
	storedModel{model}
{
}

ldraw::id_t Model::EditContext::append(std::unique_ptr<ldraw::Object>&& object)
{
	const ldraw::id_t id = object->id;
	this->model().objectsById[id] = object.get();
	this->model().append(std::move(object));
	return id;
}

void Model::EditContext::remove(int position)
{
	this->model().remove(position);
}

void Model::EditContext::setObjectProperty(
	ldraw::id_t id,
	ldraw::Property property,
	const QVariant& value)
{
	ldraw::Object* object = this->model().objectAt(id);
	if (object != nullptr)
	{
		object->setProperty(property, value);
	}
}

void Model::EditContext::invertObject(ldraw::id_t id)
{
	auto it = this->model().objectsById.find(id);
	if (it != this->model().objectsById.end())
	{
		ldraw::Object* object = it->second;
		object->invert();
	}
}

Model& Model::EditContext::model()
{
	return this->storedModel;
}

namespace
{
	using PropertyTriplet = std::tuple<ldraw::Property, ldraw::Property, ldraw::Property>;
}

static std::array<PropertyTriplet, 2> diagonalToPointProperties(ldraw::Diagonal diagonal)
{
	std::array<PropertyTriplet, 2> result;
	switch (diagonal)
	{
	case ldraw::Diagonal::Diagonal_13:
		result = {
			std::make_tuple(ldraw::Property::Point1, ldraw::Property::Point2, ldraw::Property::Point3),
			std::make_tuple(ldraw::Property::Point1, ldraw::Property::Point3, ldraw::Property::Point4)
		};
		break;
	case ldraw::Diagonal::Diagonal_24:
		result = {
			std::make_tuple(ldraw::Property::Point1, ldraw::Property::Point2, ldraw::Property::Point4),
			std::make_tuple(ldraw::Property::Point2, ldraw::Property::Point3, ldraw::Property::Point4)
		};
		break;
	}
	return result;
}

auto ldraw::splitQuadrilateral(
	Model::EditContext& editor,
	ldraw::quadrilateralid_t quadrilateral_id,
	ldraw::Diagonal splitType
) -> std::optional<std::pair<ldraw::triangleid_t, ldraw::triangleid_t>>
{
	std::optional<std::pair<ldraw::triangleid_t, ldraw::triangleid_t>> result;
	QModelIndex index;
	const ldraw::Quadrilateral* quadrilateral = editor.model().get(quadrilateral_id, &index);
	if (quadrilateral != nullptr)
	{
		Q_ASSERT(index.isValid());
		int position = index.row();
		editor.remove(position);
		std::vector<ldraw::triangleid_t> triangles;
		triangles.reserve(2);
		const std::array<PropertyTriplet, 2> split = diagonalToPointProperties(splitType);
		for (const PropertyTriplet& properties : split)
		{
			const ldraw::triangleid_t triangle = editor.insert<ldraw::Triangle>(
				position,
				quadrilateral->getProperty(std::get<0>(properties)).value<glm::vec3>(),
				quadrilateral->getProperty(std::get<1>(properties)).value<glm::vec3>(),
				quadrilateral->getProperty(std::get<2>(properties)).value<glm::vec3>(),
				ldraw::Color{quadrilateral->getProperty(ldraw::Property::Color).toInt()});
			triangles.push_back(triangle);
			position += 1;
		}
		result = {triangles[0], triangles[1]};
	}
	return result;
}