Made planets selectable

src/Screen.cpp

@@ -8,9 +8,14 @@
 #include <QTimer>
 #include <QtMath>
 
+#define BIND_LMB(f) (lmbAction = std::bind(&Screen::f, this, std::placeholders::_1))
+
 Screen::Screen(QWidget* parent) :
 	QOpenGLWidget(parent)
 {
+	setMouseTracking(true);
+	BIND_LMB(lmb_MakePlanet);
+
 	srand(time(NULL));
 
 	background = QBrush(Qt::black);
@@ -25,23 +30,39 @@ Screen::Screen(QWidget* parent) :
 
 void Screen::mouseMoveEvent(QMouseEvent* event)
 {
-	if (mouseDown)
+	if (mouseDown && hovered == nullptr)
 	{
 		Planet* planet = planets.back();
 		QPointF distance = event->localPos() - mouseClickPos;
 		planet->Resize(qSqrt(distance.x()*distance.x() + distance.y() *distance.y()));
 	}
+	else
+	{
+		hovered = nullptr;
+		for (unsigned i = planets.size(); i-- > 0; )
+		{
+			if (planets[i]->IsInside(event->localPos()))
+			{
+				setCursor(Qt::OpenHandCursor);
+				BIND_LMB(lmb_SelectPlanet);
+				hovered = planets[i];
+				break;
+			}
+		}
+
+		if (hovered == nullptr)
+		{
+			setCursor(Qt::ArrowCursor);
+			BIND_LMB(lmb_MakePlanet);
+		}
+	}
 }
 
 void Screen::mousePressEvent(QMouseEvent* event)
 {
 	if (event->button() == Qt::MouseButton::LeftButton)
 	{
-		planets.push_back(new Planet(event->localPos(), 0,
-			QColor(rand() % 256, rand() % 256, rand() % 256)
-		));
-		mouseClickPos = event->localPos();
-		mouseDown = true;
+		lmbAction(event);
 	}
 
 	if (event->button() == Qt::MouseButton::RightButton)
@@ -65,6 +86,28 @@ void Screen::Render()
 	update();
 }
 
+void Screen::lmb_MakePlanet(QMouseEvent* event)
+{
+	planets.push_back(new Planet(event->localPos(), 0,
+		QColor(rand() % 256, rand() % 256, rand() % 256)
+	));
+	mouseClickPos = event->localPos();
+	mouseDown = true;
+}
+
+void Screen::lmb_SelectPlanet(QMouseEvent* event)
+{
+	if (hovered != nullptr)
+	{
+		if (selected != nullptr)
+			selected->Select(false);
+
+		hovered->Select(true);
+	}
+
+	selected = hovered;
+}
+
 void Screen::paintEvent(QPaintEvent* event)
 {
 	QPainter painter;