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;
}

static std::array<geom::Triangle, 2> splitTriangles(ldraw::Diagonal diagonal, const glm::vec3(&points)[4])
{
	std::array<geom::Triangle, 2> result;
	switch (diagonal)
	{
	case ldraw::Diagonal::Diagonal_13:
		result = {geom::Triangle{points[0], points[1], points[2]}, {points[0], points[2], points[3]}};
		break;
	case ldraw::Diagonal::Diagonal_24:
		result = {geom::Triangle{points[0], points[1], points[3]}, {points[1], points[2], points[3]}};
		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)
	{
		const ldraw::Color color = quadrilateral->colorIndex;
		const std::array<geom::Triangle, 2> split = splitTriangles(splitType, quadrilateral->points);
		const int position = index.row();
		editor.remove(position);
		result = std::make_pair(
			editor.insert<ldraw::Triangle>(position, split[0].points, color),
			editor.insert<ldraw::Triangle>(position, split[1].points, color));
	}
	return result;
}