Encapsulate timeline and implement logic on it

application.cpp

@@ -1,4 +1,5 @@
 #include "application.h"
+#include "note.h"
 #include <SFML/Graphics/Color.hpp>
 #include <SFML/Window/Event.hpp>
 
@@ -17,27 +18,7 @@ Application::Application() :
 
 void Application::run()
 {
-    // BPM of METEOR is 170.
-    // Length is 1:14
-    // I calculated that the time between beats is about 1412162 microseconds
-
     std::string song_filename = "/home/naiji/METEOR.flac";
-    microsec starting_beat_offset = 372162;
-    int amount_of_beats = 209;
-    microsec time_between_beats = 1412162;
-    microsec note_input_offset = 412162;
-    sf::Int64 iter = starting_beat_offset + (time_between_beats * amount_of_beats);
-
-    Note::setPrecisionQualifier(note_input_offset / 2);
-
-    while (iter > 0)
-    {
-        Note note(iter, note_input_offset);
-        _timeline.push(note);
-        iter -= time_between_beats;
-    }
-
-    //    //    //    //    //    //    //    //
 
     _music.openFromFile(song_filename);
     _music.play();
@@ -163,48 +144,31 @@ void Application::onKeyPressed(const sf::Keyboard::Key &key)
     const auto arrow = keyToArrow(key);
 
     if (arrow != Note::Arrow::NONE)
-    {
+    {                                       // TODO: SHIT BLOCK.
         _debug.spawnGreenPulse();
-
-        if (!_timeline.empty())
+        const auto note = _timeline.getActiveNote();
+        if (note)
         {
-            const auto current_note = _timeline.top();
-            const auto grade_result = current_note.onTap(arrow, _music.getPlayingOffset().asMicroseconds());
-            _grade = makeGradeString(grade_result.rating);
+            // This is obscure. Active note on timeline gets received by last ::update() call.
+            // there can be 100-200 microseconds delay between onKeyPressed and update...
+            // Also the problem is that we get music offset by CURRENT music time,
+            // when active note is activated by music time of last ::update call
+            // anyway gotta think on it, smh smh smh
+            const auto music_offset = _music.getPlayingOffset().asMicroseconds();
+            const auto tap_result = note->onTap(arrow, music_offset);
+            _grade = makeGradeString(tap_result.rating);
         }
     }
 }
 
 void Application::update()
 {
-    const auto microseconds = _music.getPlayingOffset().asMicroseconds();
+    const auto music_offset = _music.getPlayingOffset().asMicroseconds();
 
-    // To Do: Here we notice when next note becomes active and ready for user input.
-    //        Here I explicitly calculate its birth time for now.
-    if (!_timeline.empty() && _timeline.top().offset() - 412162 <= microseconds)
-    {
-        _debug.spawnBluePulse();
-    }
+    _timeline.update(music_offset);
+    _debug.update(music_offset);
 
-    // To do: Actual note offset should pulse only once and the note shouldn't die right after it,
-    //        because there is also "after pulse" offset, like, you know, player can be a little late
-    if (!_timeline.empty() && _timeline.top().offset() <= microseconds)
-    {
-        _timeline.pop();
-        _debug.spawnRedPulse();
-    }
-
-    // To do: Here should be the end of "after pulse" time. When user fucked up all the time and the
-    //        note dies with "Missed" grade.
-    //
-    // if ( . . . _timeline.top().offset() + 412162 <= microseconds)
-    // {
-    //
-    // }
-
-    _debug.update(microseconds);
-
-    if (_grade.getFillColor().a > 0)
+    if (_grade.getFillColor().a > 0)    // TODO: Encapsulate
     {
         const auto alpha = _grade.getFillColor().a - 20;
         _grade.setFillColor(sf::Color(255, 255, 255, alpha < 0 ? 0 : alpha));
@@ -215,7 +179,7 @@ void Application::update()
 void Application::draw()
 {
     _game_window.clear();
-    _debug.drawOn(_game_window);
+    _game_window.draw(_debug);
     _game_window.draw(_grade);
     _game_window.display();
 }

application.h

@@ -5,10 +5,8 @@
 #include <SFML/System/Clock.hpp>
 #include <SFML/Window/Keyboard.hpp>
 
-#include <stack>
-
 #include "debughelper.h"
-#include "note.h"
+#include "timeline.h"
 
 class Application
 {
@@ -23,12 +21,10 @@ private:
     sf::RenderWindow _game_window;
     sf::Music _music;
 
-    std::stack<Note> _timeline;
-    sf::Int64 _time_since_last_tick;
-    sf::Int64 _last_stamp;
     sf::Font _font;
     sf::Text _grade;
 
+    Timeline _timeline;
     DebugHelper _debug;
 
     void startGameLoop();

debughelper.cpp

@@ -28,14 +28,14 @@ void DebugHelper::update(const microsec &microseconds)
     _blue_pulse.fade();
 }
 
-void DebugHelper::drawOn(sf::RenderWindow &game_window) const
+void DebugHelper::draw(sf::RenderTarget& target, sf::RenderStates states) const
 {
     if (_toggled)
     {
-        _red_pulse.drawOn(game_window);
-        _green_pulse.drawOn(game_window);
-        _blue_pulse.drawOn(game_window);
-        game_window.draw(_time_print);
+        target.draw(_green_pulse, states);
+        target.draw(_red_pulse, states);
+        target.draw(_blue_pulse, states);
+        target.draw(_time_print, states);
     }
 }
 
@@ -83,7 +83,7 @@ void DebugHelper::Pulse::fade()
     _pulse_shape.setFillColor(fill_color);
 }
 
-void DebugHelper::Pulse::drawOn(sf::RenderWindow &game_window) const
+void DebugHelper::Pulse::draw(sf::RenderTarget& target, sf::RenderStates states) const
 {
-    game_window.draw(_pulse_shape);
+    target.draw(_pulse_shape, states);
 }

debughelper.h

@@ -8,14 +8,14 @@
 
 using microsec = sf::Int64;
 
-class DebugHelper
+class DebugHelper : public sf::Drawable
 {
 public:
     DebugHelper(bool init = true);
 
     void toggle();
     void update(const microsec& microseconds);
-    void drawOn(sf::RenderWindow &game_window) const;
+    virtual void draw(sf::RenderTarget& target, sf::RenderStates states) const override;
 
     void spawnGreenPulse();
     void spawnRedPulse();
@@ -26,14 +26,14 @@ private:
     sf::Font _font;
     sf::Text _time_print;
 
-    class Pulse
+    class Pulse : public sf::Drawable
     {
     public:
         Pulse(sf::Vector2f position, sf::Color fill_color);
         void appear();
         void fade();
 
-        void drawOn(sf::RenderWindow &game_window) const;
+        virtual void draw(sf::RenderTarget& target, sf::RenderStates states) const override;
 
     private:
         sf::RectangleShape _pulse_shape;

note.cpp

@@ -2,8 +2,8 @@
 #include <cmath>
 
 Note::Note(microsec offset, microsec life_span_offset, Note::Arrow type) :
-    _offset(offset),
-    _start_handling_offset(_offset + life_span_offset),
+    _offset(offset),                                     // TODO: Move to struct NoteData
+    _start_handling_offset(_offset + life_span_offset),  //   so Note::Note(NoteData&& data) : . . .
     _end_handling_offset(_offset - life_span_offset),
     _type(type)
 {}
@@ -50,7 +50,7 @@ bool Note::isActive(microsec music_play_offset) const noexcept
         && music_play_offset < _end_handling_offset;
 }
 
-void Note::setPrecisionQualifier(microsec qualifier)
+void Note::resetPrecisionQualifier(microsec qualifier)
 {
     _precision_qualifier = qualifier;
 }

note.h

@@ -47,7 +47,7 @@ public:
     NoteGrade onTap(Arrow arrow_type, microsec tap_time_stamp) const;
     bool isActive(microsec music_play_offset) const noexcept;
 
-    static void setPrecisionQualifier(microsec qualifier);
+    static void resetPrecisionQualifier(microsec qualifier = 500000);
 
 private:
     coordinates _position;

timeline.cpp

@@ -0,0 +1,66 @@
+#include "timeline.h"
+#include "note.h"
+
+Timeline::Timeline()
+{
+    // BPM of METEOR is 170.
+    // Length is 1:14
+    // I calculated that the time between beats is about 1412162 microseconds
+
+    microsec starting_beat_offset = 372162;
+    int amount_of_beats = 209;
+    microsec time_between_beats = 1412162;
+    microsec note_input_offset = 412162;
+    microsec interval = starting_beat_offset + (time_between_beats * amount_of_beats);
+
+    Note::resetPrecisionQualifier(note_input_offset / 2);
+
+    while (interval > 0)
+    {
+        _timeline.emplace_back(new Note(interval, note_input_offset));
+        interval -= time_between_beats;
+    }
+
+    _active_note = nullptr;
+    _top_note = _timeline.begin();
+}
+
+Timeline::~Timeline()
+{
+    for (auto note : _timeline)
+        delete note;
+
+    _timeline.clear();
+    _top_note = _timeline.end();
+    _active_note = nullptr;
+
+    Note::resetPrecisionQualifier();
+}
+
+void Timeline::update(const microsec &microseconds)
+{
+    checkCurrentActiveNote(microseconds);
+    checkForNextActiveNote(microseconds);
+}
+
+void Timeline::checkCurrentActiveNote(const microsec &microseconds)
+{
+    if (_active_note && !_active_note->isActive(microseconds))
+    {
+        _active_note = nullptr;
+        ++_top_note;
+    }
+}
+
+void Timeline::checkForNextActiveNote(const microsec &microseconds)
+{
+    if (!_active_note && (*_top_note)->isActive(microseconds))
+    {
+        _active_note = *_top_note;
+    }
+}
+
+const Note* Timeline::getActiveNote() const noexcept
+{
+    return _active_note;
+}

timeline.h

@@ -0,0 +1,44 @@
+#ifndef TIMELINE_H
+#define TIMELINE_H
+
+#include <SFML/Config.hpp>
+
+#include <vector>
+#include <memory>
+
+using microsec = sf::Int64;
+class Note;
+
+class Timeline
+{
+public:
+    explicit Timeline();
+    ~Timeline();
+
+    void update(const microsec& microseconds);
+    const Note* getActiveNote() const noexcept;
+
+private:
+    std::vector<Note*> _timeline;
+    std::vector<Note*>::iterator _top_note;
+    Note* _active_note;
+
+    void checkCurrentActiveNote(const microsec &microseconds);
+    void checkForNextActiveNote(const microsec &microseconds);
+
+    /* Difference between top and active note is that
+     * top note is the note handling input right now
+     * OR it's the closest note from current music offset
+     * position, not necessarily active. A note stops being top only
+     * after dying or being tapped by player, even if it's already
+     * past her perfect offset.
+     *
+     * Meanwhile active note is the note which is currently handling
+     *     player input for grade.
+     *
+     * An active note is always top note but a top note
+     *    is not always active note.
+     *                                         */
+};
+
+#endif // TIMELINE_H