Clicker now moves when you click him.

demos/clicker_game.cpp

@@ -3,6 +3,7 @@
 #include "guecs/ui.hpp"
 #include <fmt/xchar.h>
 #include <deque>
+#include <iostream>
 
 constexpr const int WINDOW_WIDTH=1280;
 constexpr const int WINDOW_HEIGHT=720;
@@ -15,9 +16,59 @@ enum class Event {
   CLICKER, A_BUTTON
 };
 
+struct Shake {
+  float scale_factor = 0.05f;
+  int frames = 10;
+  float ease_rate = 0.1f;
+  bool playing = false;
+  int current = 0;
+  float x=0.0;
+  float y=0.0;
+  float w=0.0;
+  float h=0.0;
+  sf::Vector2f initial_scale;
+
+  float ease() {
+    float tick = float(frames) / float(current) * ease_rate;
+    return (std::sin(tick) + 1.0) / 2.0;
+  }
+
+  void init(lel::Cell& cell) {
+    x = cell.x;
+    y = cell.y;
+    w = cell.w;
+    h = cell.h;
+  }
+
+  void play(guecs::Sprite& sprite) {
+    if(!playing) {
+      playing = true;
+      current = 0;
+      initial_scale = sprite.sprite->getScale();
+    }
+  }
+
+  void render(guecs::Sprite& sprite) {
+    current++;
+
+    if(playing && current < frames) {
+      float tick = ease();
+      sf::Vector2f scale{
+        std::lerp(initial_scale.x, initial_scale.x + scale_factor, tick),
+        std::lerp(initial_scale.y, initial_scale.y + scale_factor, tick)};
+
+      sprite.sprite->setScale(scale);
+    } else {
+      playing = false;
+      current = 0;
+      sprite.sprite->setScale(initial_scale);
+    }
+  }
+};
 
 struct ClickerUI {
   guecs::UI $gui;
+  guecs::Entity $clicker;
 
   ClickerUI() {
     $gui.position(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
@@ -30,7 +81,7 @@ struct ClickerUI {
   }
 
   void init() {
-    $gui.set<guecs::Background>($gui.MAIN, {});
+    $gui.set<guecs::Background>($gui.MAIN, {$gui.$parser, {0, 0, 0, 255}});
 
      for(auto& [name, cell] : $gui.cells()) {
        auto id = $gui.entity(name);
@@ -42,21 +93,32 @@ struct ClickerUI {
          $gui.set<guecs::Clickable>(id, {
              [&](auto, auto) { handle_button(Event::A_BUTTON); }
          });
-      } else {
-        $gui.set<guecs::Sprite>(id, {"clicker_the_dog"});
-        $gui.set<guecs::Sound>(id, {"clicker_bark"});
-        $gui.set<guecs::Effect>(id, {0.1f, "ui_shader"});
-        $gui.set<guecs::Clickable>(id, {
-            [&](auto, auto) { handle_button(Event::CLICKER); }
-        });
        }
      }
 
+     $clicker = $gui.entity("clicker");
+     $gui.set<guecs::Sprite>($clicker, {"clicker_the_dog"});
+     $gui.set<guecs::Sound>($clicker, {"clicker_bark"});
+     $gui.set<guecs::Clickable>($clicker, {
+         [&](auto, auto) { handle_button(Event::CLICKER); }
+     });
+
+     // custom components need to be initialized manually
+     $gui.set_init<Shake>($clicker, {});
+
     $gui.init();
   }
 
   void render(sf::RenderWindow& window) {
+    auto& shaker = $gui.get<Shake>($clicker);
+    if(shaker.playing) {
+      auto& sprite = $gui.get<guecs::Sprite>($clicker);
+      shaker.render(sprite);
+      window.clear();
+    }
+
     $gui.render(window);
+
     // $gui.debug_layout(window);
   }
 
@@ -67,10 +129,12 @@ struct ClickerUI {
   void handle_button(Event ev) {
     using enum Event;
     switch(ev) {
-      case CLICKER:
+      case CLICKER: {
+        auto& shaker = $gui.get<Shake>($clicker);
+        auto& sprite = $gui.get<guecs::Sprite>($clicker);
+        shaker.play(sprite);
         fmt::println("CLICKER LOVES YOU!");
-        break;
-
+      } break;
       case A_BUTTON:
         fmt::println("a button clicked");
         break;

src/guecs/sfml/components.cpp

@@ -1,6 +1,7 @@
 #include "guecs/ui.hpp"
 #include "guecs/sfml/backend.hpp"
 #include <cassert>
+#include <iostream>
 
 namespace guecs {
   using std::make_shared;
@@ -88,10 +89,19 @@ namespace guecs {
   }
 
   void Background::init() {
+    assert(w > 0.0f && "Background.w must be > 0.0f. Forgot $gui.$parser?");
+    assert(h > 0.0f && "Background.h must be > 0.0f. Forgot $gui.$parser?");
+
+    std::cout << "x=" << x << " y=" << y << " w=" << w << " h=" << h << std::endl;
     sf::Vector2f size{float(w), float(h)};
-    if(shape == nullptr) shape = make_shared<sf::RectangleShape>(size);
+    if(shape == nullptr) {
+      shape = make_shared<sf::RectangleShape>(size);
+    } else {
+      shape->setSize(size);
+    }
     shape->setPosition({float(x), float(y)});
     shape->setFillColor(color);
+    assert(shape != nullptr && "failed to make rectangle");
   }
 
   void Effect::init(lel::Cell &cell) {

src/guecs/ui.cpp

@@ -2,6 +2,7 @@
 #include <typeinfo>
 #include <cassert>
 #include <fmt/core.h>
+#include <iostream>
 
 namespace guecs {
   using std::make_shared;