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/* FormationPositioner.h
Copyright (c) 2019-2022 by Peter van der Meer
Endless Sky 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.
Endless Sky 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 <https://www.gnu.org/licenses/>.
*/
#pragma once
#include "Angle.h"
#include <map>
#include <memory>
#include <vector>
class Body;
class FormationPattern;
class Ship;
// Represents an active formation for a set of spaceships. Assigns each ship
// to a position (Point) in the formation.
class FormationPositioner {
public:
// Initializer based on the formation pattern to follow.
FormationPositioner(const Body *formationLead, const FormationPattern *pattern);
// Start/reset/initialize for a (new) round of formation position calculations.
void Step();
// Get the formation position for the ship given as parameter. If a given ship is
// not participating yet, then it will be added.
Point Position(const Ship *ship);
private:
// Re-generate the list of (relative) positions for the ships in the formation.
void CalculatePositions();
// Calculate the direction the formation is facing.
void CalculateDirection();
// Check if a ship is actually still participating in the current formation(ring).
bool IsActiveInFormation(const Ship *ship) const;
// Remove a ship from the formation (based on its index). The last ship
// in the formation will take the position of the removed ship (if the removed
// ship itself is not the last ship).
void Remove(unsigned int index);
private:
// Lists of ships on the rings. Used when (re)generating positions for the ring.
// The actual positions are stored in shipPositions.
std::vector<std::weak_ptr<const Ship>> shipsInFormation;
// Lookup/cache of the ship coordinates in the formation, its ring-section and
// an indicator if it was seen since last generate loop.
std::map<const Ship *, std::pair<Point, bool>> shipPositions;
// Timer that controls the (re)generation of ship positions.
int positionsTimer = 0;
// The scaling factor as we currently have for this formation for the ship or
// other body around which this formation is formed.
double centerBodyRadius = 150;
// The body around which the formation will be formed and the pattern to follow.
const Body *formationLead;
const FormationPattern *pattern;
// The formation facing direction.
Angle direction;
// Settings for flipping/mirroring of the pattern.
bool flippedX = false;
bool flippedY = false;
// Status variable used to track if ships still participate in the formation.
// TODO: This method of tracking shouldn't be needed; ships themselves should have a state to show what they are doing.
bool tickTock = true;
};
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