add and delete on simulation thread

src/MainWindow.cpp

@@ -12,7 +12,6 @@
 #include <QDial>
 #include <QColorDialog>
 #include <QCoreApplication>
-#include "Pendulum.h"
 #include "Button.h"
 #include <QThread>
 #include <QCloseEvent>
@@ -297,6 +296,7 @@ QWidget * MainWindow::buildAddUI() {
 	removeBtn->setStyleSheet("background-color: #ffaaaa");
 
 	connect(addBtn, &QPushButton::clicked, this, &MainWindow::add);
+	connect(this, &MainWindow::pendulaCreated, simulation, &Simulation::addPendula);
 	connect(removeBtn, &QPushButton::clicked, simulation, &Simulation::clearPendula);
 
 	btnLyt->addWidget(addBtn);
@@ -393,8 +393,8 @@ void MainWindow::normalizeLengths() {
 }
 
 void MainWindow::add() {
+	std::vector<Pendulum *> addPendula;
 	if (multiple){
-
 		for (int i = 0; i < count; i++){
 			auto M = std::vector(masses.begin(), masses.begin() + segments);
 			auto L = std::vector(lengths.begin(), lengths.begin() + segments);
@@ -417,13 +417,14 @@ void MainWindow::add() {
 				auto hue = float(progress + 0.5);
 				c = QColor::fromHsvF(hue, 1, 1);
 			}
-			simulation->pendula.push_back(new Pendulum(M, L, c, angle));
+			addPendula.push_back(new Pendulum(M, L, c, angle));
 		}
 	} else {
 		auto M = std::vector(masses.begin(), masses.begin() + segments);
 		auto L = std::vector(lengths.begin(), lengths.begin() + segments);
-		simulation->pendula.push_back(new Pendulum(M, L, color, startingAngle));
+		addPendula.push_back(new Pendulum(M, L, color, startingAngle));
 	}
+	emit pendulaCreated(addPendula);
 }
 
 void MainWindow::resetSimulationControl() {

src/MainWindow.h

@@ -1,6 +1,7 @@
 #include <QWidget>
 #include <vector>
 #include "Slider.h"
+#include "Pendulum.h"
 
 class Simulation;
 class QGridLayout;
@@ -9,6 +10,7 @@ class GLWidget;
 enum Property {Angle, Mass, Length};
 
 class MainWindow : public QWidget {
+	Q_OBJECT
 public:
 	explicit MainWindow();
 protected:
@@ -39,7 +41,8 @@ private:
 	Slider<double> * gravitySlider = nullptr, * timescaleSlider = nullptr;
 	Slider<> * substepsSlider = nullptr;
 
-
+signals:
+	void pendulaCreated(const std::vector<Pendulum*> &add);
 public slots:
 	void resetMasses();
 	void resetLengths();

src/Simulation.cpp

@@ -14,7 +14,7 @@ Simulation::Simulation() {
 	lastUpdate = high_resolution_clock::now();
 };
 
-void Simulation::draw(QPainter *p, int screenSize) const {
+void Simulation::draw(QPainter *p, int screenSize) {
 	double scale = screenSize * 0.95 / size;
 
 	for (const auto pendulum : pendula)
@@ -35,14 +35,22 @@ void Simulation::update() {
 	h /= substeps;
 
 	#pragma omp parallel for
-	for (const auto pendulum : pendula)
-		for (int i = 0; i < substeps; i++)
+	for (const auto & pendulum : pendula)
+		for (int k = 0; k < substeps; k++)
 			pendulum->update(h, gravity);
 }
 
 void Simulation::clearPendula() {
-	for (auto p : pendula)
-		delete p;
+	auto deleteLater = pendula;
 	pendula.clear();
+	pendula.shrink_to_fit();
+	QThread::usleep(500000);
+	for (auto p : deleteLater)
+		delete p;
+}
+
+void Simulation::addPendula(const std::vector<Pendulum *> &add) {
+	for (auto p : add)
+		pendula.push_back(p);
 }
 

src/Simulation.h

@@ -19,19 +19,17 @@ public:
 	double timescale {};
 	int substeps {};
 
-	int updateInterval = 17;
-
 	bool isPlaying = false;
 
-	std::vector<Pendulum *> pendula;
-
-	QTimer * timer;
-
-	void draw(QPainter*, int) const;
+	void draw(QPainter*, int);
 public slots:
 	void clearPendula();
+	void addPendula(const std::vector<Pendulum *> &add);
 private slots:
 	void update();
 private:
+	QTimer * timer;
+	int updateInterval = 17;
+	std::vector<Pendulum *> pendula;
 	time_point<system_clock> lastUpdate;
 };