sms: rate-limit selections from mouse move events

sms/sms/include/display.h

@@ -21,6 +21,7 @@ class Display : public QGLWidget {
     const unsigned int GRID_SIZE = 100;
     const float AXES_HEIGHT = 5.0f;
     const unsigned int AXES_SLICES = 32;
+    const float SELECT_RATE_LIMIT = 1000.0f / 5.0f;
 
     public:
         Display(QWidget * parent = nullptr);
@@ -52,7 +53,7 @@ class Display : public QGLWidget {
         virtual void wheelEvent(QWheelEvent * event);
 
     private:
-        void select(Vector click);
+        void select(Vector click, bool rate_limit);
         void draw_simulation(Simulation * s);
         void update_fps();
 
@@ -62,6 +63,7 @@ class Display : public QGLWidget {
         GLuint m_texture;
         GLUquadric * m_quadric;
 
+        QTime m_last_select;
         QTime m_last_frame;
         unsigned int m_frame_count;
         unsigned int m_fps;

sms/sms/src/display.cpp

@@ -12,6 +12,7 @@ Display::Display(QWidget * parent) :
         m_selected(nullptr),
         m_texture(0),
         m_quadric(nullptr),
+        m_last_select(QTime::currentTime()),
         m_last_frame(QTime::currentTime()),
         m_ctrl_key_down(false),
         m_draw_grid(false),
@@ -61,7 +62,10 @@ void Display::paintGL() {
     Rendering::draw_hud(this->m_fps);
 }
 
-void Display::select(Vector click) {
+void Display::select(Vector click, bool rate_limit) {
+    if(rate_limit && this->m_last_select.elapsed() < this->SELECT_RATE_LIMIT)
+        return;
+    this->m_last_select = QTime::currentTime();
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     GLint viewport[4];
     glGetIntegerv(GL_VIEWPORT, viewport);
@@ -176,7 +180,7 @@ void Display::keyReleaseEvent(QKeyEvent * event) {
 void Display::mousePressEvent(QMouseEvent * event) {
     this->m_click_position = Vector(event->x(), event->y());
     if(event->button() == Qt::LeftButton)
-        this->select(this->m_click_position);
+        this->select(this->m_click_position, false);
 }
 
 void Display::mouseReleaseEvent(QMouseEvent * event) {
@@ -198,7 +202,7 @@ void Display::mouseMoveEvent(QMouseEvent * event) {
         }
     } else {
         if(!(event->buttons() & Qt::LeftButton))
-            this->select(position);
+            this->select(position, true);
         else if(this->m_selected) {
             auto move = (this->m_click_position - position)
                 / this->m_camera.distance();