Now have a simple camera system that I can configure in json for different motion effects.

assets/cameras.json

@@ -0,0 +1,74 @@
+{
+  "pan": {
+    "_type": "Animation",
+    "easing": 2,
+    "motion": 7,
+    "ease_rate": 0.05,
+    "min_x": 0,
+    "min_y": 0,
+    "max_x": 150.0,
+    "max_y": 0.0,
+    "simple": true,
+    "frames": 1,
+    "speed": 0.01,
+    "scaled": false,
+    "stationary": true,
+    "toggled": false,
+    "flipped": false,
+    "looped": false
+  },
+  "shake": {
+    "_type": "Animation",
+    "easing": 6,
+    "motion": 1,
+    "ease_rate": 0.05,
+    "min_x": -10.0,
+    "min_y": -10.0,
+    "max_x": 10.0,
+    "max_y": 10.0,
+    "simple": true,
+    "frames": 1,
+    "speed": 0.01,
+    "scaled": false,
+    "stationary": true,
+    "toggled": false,
+    "flipped": false,
+    "looped": false
+  },
+  "dolly": {
+    "_type": "Animation",
+    "easing": 2,
+    "motion": 0,
+    "ease_rate": 0.05,
+    "min_x": 0.8,
+    "min_y": 0.8,
+    "max_x": 1.3,
+    "max_y": 1.3,
+    "simple": true,
+    "frames": 1,
+    "speed": 0.01,
+    "scaled": true,
+    "stationary": true,
+    "toggled": false,
+    "flipped": false,
+    "looped": false
+  },
+  "bounce": {
+    "_type": "Animation",
+    "easing": 3,
+    "motion": 2,
+    "ease_rate": 0.05,
+    "min_x": -10,
+    "min_y": -10,
+    "max_x": 10,
+    "max_y": 10,
+    "simple": true,
+    "frames": 1,
+    "speed": 0.01,
+    "scaled": false,
+    "stationary": true,
+    "toggled": false,
+    "flipped": false,
+    "looped": false
+  }
+}

boss/fight.cpp

@@ -87,7 +87,7 @@ namespace boss {
         const std::string& player_pos = run % 10 < 5 ? "player1" : "player2";
         $ui.move_actor("player", player_pos);
         $ui.zoom(player_pos);
-        $ui.$zoom_anim.play();
+        $ui.$camera.play();
         int attack_id = std::any_cast<int>(data);
         boss::System::combat(attack_id);
         state(State::PLAYER_TURN);

boss/ui.cpp

@@ -12,10 +12,10 @@ namespace boss {
     $combat_ui(true),
     $arena(scene),
     $view_texture({BOSS_VIEW_WIDTH, BOSS_VIEW_HEIGHT}),
-    $view_sprite($view_texture.getTexture()),
-    $zoom_anim(animation::load("test_zoom"))
+    $view_sprite($view_texture.getTexture())
   {
     $view_sprite.setPosition({BOSS_VIEW_X, BOSS_VIEW_Y});
+    $camera.style("bounce");
   }
 
   void UI::init() {
@@ -45,7 +45,7 @@ namespace boss {
     $actions.render(window);
     $combat_ui.render(window);
 
-    if($zoom_anim.playing) {
+    if($camera.playing()) {
       zoom("player2");
     }
 
@@ -80,12 +80,12 @@ namespace boss {
     if(cell_name == "") {
       sf::View zoom{{BOSS_VIEW_WIDTH/2,BOSS_VIEW_HEIGHT/2}, {BOSS_VIEW_WIDTH, BOSS_VIEW_HEIGHT}};
       $view_texture.setView(zoom);
-    } else if($zoom_anim.playing) {
+    } else if($camera.playing()) {
       auto& cell = $arena.$ui.cell_for(cell_name);
-      sf::Vector2f pos{float(cell.x/2), float(cell.y/2)};
-      sf::View zoom;
-      $zoom_anim.apply(zoom, pos, {BOSS_VIEW_WIDTH/2, BOSS_VIEW_HEIGHT/2});
-      $view_texture.setView(zoom);
+
+      $camera.resize({BOSS_VIEW_WIDTH/2, BOSS_VIEW_HEIGHT/2});
+      $camera.move($view_texture,
+          {float(cell.x/2), float(cell.y/2)});
     }
 
     $view_sprite.setPosition({BOSS_VIEW_X, BOSS_VIEW_Y});

boss/ui.hpp

@@ -3,6 +3,7 @@
 #include <guecs/ui.hpp>
 #include "gui/combat_ui.hpp"
 #include "scene.hpp"
+#include "camera.hpp"
 
 namespace components {
   struct Animation;
@@ -18,7 +19,7 @@ namespace boss {
     guecs::UI $actions;
     sf::RenderTexture $view_texture;
     sf::Sprite $view_sprite;
-    components::Animation $zoom_anim;
+    cinematic::Camera $camera;
 
     UI(components::AnimatedScene &scene, DinkyECS::Entity boss_id);
 

camera.cpp

@@ -0,0 +1,56 @@
+#include "camera.hpp"
+#include <fmt/core.h>
+#include "animation.hpp"
+#include <unordered_map>
+#include "components.hpp"
+#include "config.hpp"
+
+namespace cinematic {
+  using components::Animation, std::string;
+
+  struct CameraManager {
+    std::unordered_map<string, Animation> animations;
+  };
+
+  static CameraManager MGR;
+  static bool initialized = false;
+
+  void init() {
+    if(!initialized) {
+      auto cameras = settings::get("cameras");
+      for(auto &[name, data] : cameras.json().items()) {
+        auto anim = components::convert<Animation>(data);
+        MGR.animations.try_emplace(name, anim);
+      }
+
+      initialized = true;
+    }
+  }
+
+  Camera::Camera() :
+    anim(MGR.animations.at("pan"))
+  {
+  }
+
+  void Camera::resize(sf::Vector2f to) {
+    size = to;
+  }
+
+  void Camera::style(const std::string &name) {
+    anim = MGR.animations.at(name);
+  }
+
+  void Camera::move(sf::RenderTexture& target, sf::Vector2f pos) {
+    sf::View zoom;
+    anim.apply(zoom, pos, size);
+    target.setView(zoom);
+  }
+
+  bool Camera::playing() {
+    return anim.playing;
+  }
+
+  void Camera::play() {
+    anim.play();
+  }
+}

camera.hpp

@@ -1 +1,21 @@
 #pragma once
+#include "components.hpp"
+#include <SFML/Graphics/RenderTexture.hpp>
+
+namespace cinematic {
+  struct Camera {
+    components::Animation anim;
+    sf::View view;
+    sf::Vector2f size;
+
+    Camera();
+
+    void resize(sf::Vector2f size);
+    void move(sf::RenderTexture& target, sf::Vector2f pos);
+    bool playing();
+    void play();
+    void style(const std::string &name);
+  };
+
+  void init();
+}

main.cpp

@@ -8,6 +8,7 @@
 #include "shaders.hpp"
 #include "backend.hpp"
 #include "game_level.hpp"
+#include "camera.hpp"
 
 int main(int argc, char* argv[]) {
   try {
@@ -16,6 +17,7 @@ int main(int argc, char* argv[]) {
     guecs::init(&backend);
     ai::init("ai");
     animation::init();
+    cinematic::init();
     GameDB::init();
 
     if(DEBUG_BUILD) sound::mute(true);

meson.build

@@ -89,6 +89,7 @@ sources = [
   'boss/fight.cpp',
   'boss/system.cpp',
   'boss/ui.cpp',
+  'camera.cpp',
   'combat.cpp',
   'components.cpp',
   'config.cpp',
@@ -132,9 +133,9 @@ sources = [
 executable('runtests', sources + [
   'tests/ai.cpp',
   'tests/animation.cpp',
-  'tests/animation2.cpp',
   'tests/base.cpp',
   'tests/battle.cpp',
+  'tests/camera.cpp',
   'tests/components.cpp',
   'tests/config.cpp',
   'tests/dbc.cpp',

tests/animation2.cpp

@@ -1,117 +0,0 @@
-#include <catch2/catch_test_macros.hpp>
-#include <fmt/core.h>
-#include <string>
-#include <coroutine>
-#include <chrono>
-#include "rand.hpp"
-#include <thread>
-#include <vector>
-#include "components.hpp"
-#include <iostream>
-#include "stats.hpp"
-#include "simplefsm.hpp"
-#include "textures.hpp"
-#include "animation.hpp"
-
-using namespace std::chrono_literals;
-using components::Animation;
-using TheClock = std::chrono::steady_clock;
-using TimeDelta = TheClock::duration;
-using TimePoint = std::chrono::time_point<TheClock>;
-const TimeDelta MIN_TICK = 200ms;
-
-struct AnimationState {
-  Animation anim;
-  TimeDelta wait = 1s;
-  sf::Vector2f scale{1.0, 1.0};
-  sf::Vector2f pos{0.0, 0.0};
-  sf::IntRect rect{{0, 0}, {300, 300}};
-
-  void step() {
-    anim.step(scale, pos, rect);
-  }
-
-  void apply(textures::SpriteTexture& st) {
-    anim.apply(*st.sprite, pos);
-  }
-};
-
-struct AnimationQueue {
-  std::vector<AnimationState> active;
-  TimePoint last_tick;
-  TimeDelta wait_for = MIN_TICK;
-  size_t in_queue = 0;
-  size_t chunk = 1000;
-
-  TimeDelta delta() {
-    return TheClock::now() - last_tick;
-  }
-
-  void tick() {
-    last_tick = TheClock::now();
-  }
-
-  size_t add(Animation& anim, int initial_wait) {
-    active.emplace_back(anim, TheClock::duration(initial_wait));
-    return active.size() - 1;
-  }
-
-  AnimationState& get(size_t id) {
-    return active.at(id);
-  }
-
-  void render() {
-    wait_for = MIN_TICK;
-    auto dt = delta();
-
-    for(size_t i = 0; i < chunk; i++) {
-      in_queue++;
-      auto& a = active[in_queue % active.size()];
-
-      if(!a.anim.playing) continue;
-
-      if(a.wait < wait_for) {
-        wait_for = a.wait;
-      }
-
-      if(a.wait < dt) {
-        // fmt::println("play animation: {} total                  ", active.size());
-        a.step();
-      }
-    }
-  }
-};
-
-TEST_CASE("simple coroutine animation test", "[coro]") {
-  AnimationQueue queue;
-  Animation anim;
-  anim.play();
-
-  for(int i = 0; i < 100; i++) {
-    int time = Random::uniform(16, 32);
-    size_t id = queue.add(anim, time);
-    auto& what = queue.get(id);
-
-    REQUIRE(what.wait == TheClock::duration(time));
-  }
-
-  dbc::check(queue.active.size() > 0, "zero size queue after adding is impossible.");
-  queue.tick();
-  Stats stats;
-
-  for(int i = 0; i < 10000; i++) {
-    auto start = stats.time_start();
-    auto delta = queue.delta();
-
-    queue.render();
-
-    if(delta > queue.wait_for) {
-      queue.add(anim, Random::uniform(100, 5000));
-      queue.tick();
-    }
-
-    stats.sample_time(start);
-  }
-
-  fmt::print("stdev: {}, mean: {}\r", stats.stddev(), stats.mean());
-}

tests/camera.cpp

@@ -0,0 +1,6 @@
+#include <catch2/catch_test_macros.hpp>
+#include <fmt/core.h>
+
+TEST_CASE("view based camera system", "[camera]") {
+  REQUIRE(1 == 1);
+}

tools/arena.cpp

@@ -13,6 +13,7 @@
 #include "events.hpp"
 #include "constants.hpp"
 #include "gui/event_router.hpp"
+#include "camera.hpp"
 
 void craft_weapon() {
   auto world = GameDB::current_world();
@@ -28,6 +29,7 @@ int main(int, char*[]) {
   ai::init("ai");
   animation::init();
   GameDB::init();
+  cinematic::init();
 
   sf::RenderWindow window(sf::VideoMode({SCREEN_WIDTH, SCREEN_HEIGHT}), "Bossfight Testing Arena");
   window.setVerticalSyncEnabled(VSYNC);