Better design that has a render/update cycle for components.

demos/meters.cpp

@@ -37,7 +37,15 @@ struct TestMeters {
       $gui.set<guecs::Clickable>(gui_id, {
           [&, gui_id, name](auto) {
             auto& meter = $gui.get<guecs::Meter>(gui_id);
-            meter.update_percent(1.0f);
+            auto& bg = $gui.get<guecs::Rectangle>(gui_id);
+            meter.percent = 1.0f;
+            if(meter.color.r == 255) {
+              meter.color = guecs::THEME.DARK_LIGHT;
+              bg.color = {120, 25, 25, 255};
+            } else {
+              meter.color = {255, 0, 0, 255};
+              bg.color = {0,255,0,255};
+            }
           }
       });
     }
@@ -54,6 +62,7 @@ struct TestMeters {
   }
 
   void update() {
+    $gui.update();
   }
 };
 
@@ -94,9 +103,9 @@ int main() {
 
       gui.$gui.query<guecs::Meter>([](auto ent, auto& meter) {
           if(meter.percent <= 0.0f) {
-            meter.update_percent(1.0f);
+            meter.percent = 1.0f;
           } else {
-            meter.update_percent(meter.percent - (0.01f * float(ent)));
+            meter.percent -= 0.01f * float(ent);
           }
       });
 

include/guecs/sfml/components.hpp

@@ -61,6 +61,7 @@ namespace guecs {
 
     void init(lel::Cell& cell);
     void render(sf::RenderTarget& window, sf::Shader *shader_ptr);
+    void update();
   };
 
   // BUG: meter needs a backing rectangle of one color for the full bar, then
@@ -72,17 +73,16 @@ namespace guecs {
     int padding = THEME.PADDING;
     bool vertical = false;
     Rectangle bar{padding, color};
+
     // this is set automatically if a Rectangle is configured for the cell
-    Rectangle backing_rect{padding, color};
     size_t $cell_x = 0;
     size_t $cell_y = 0;
     size_t $cell_w = 0;
     size_t $cell_h = 0;
 
-    void init(lel::Cell& cell, guecs::Rectangle &bg);
     void init(lel::Cell& cell);
     void render(sf::RenderTarget& window, sf::Shader *shader_ptr);
-    void update_percent(float pct);
+    void update();
   };
 
   struct Effect {

include/guecs/ui.hpp

@@ -82,6 +82,7 @@ namespace guecs {
 
       void init();
       void render(sf::RenderTarget& window);
+      void update();
       bool mouse(float x, float y, Modifiers mods);
       void click_on(const std::string& name, Modifiers mods=NO_MODS);
       void click_on(Entity slot_id, Modifiers mods=NO_MODS);

src/guecs/sfml/components.cpp

@@ -96,10 +96,7 @@ namespace guecs {
   void Rectangle::init(lel::Cell& cell) {
     sf::Vector2f size{float(cell.w) - padding * 2, float(cell.h) - padding * 2};
     if(shape == nullptr) shape = make_shared<sf::RectangleShape>(size);
-    shape->setFillColor(color);
-    shape->setOutlineColor(border_color);
-    shape->setOutlineThickness(border_px);
-
+    update();
     sfml_center_helper(shape, cell, padding);
   }
 
@@ -107,9 +104,10 @@ namespace guecs {
     window.draw(*shape, shader_ptr);
   }
 
-  void Meter::init(lel::Cell& cell, Rectangle& bg) {
-    backing_rect = bg;
-    init(cell);
+  void Rectangle::update() {
+    shape->setFillColor(color);
+    shape->setOutlineColor(border_color);
+    shape->setOutlineThickness(border_px);
   }
 
   void Meter::init(lel::Cell& cell) {
@@ -118,15 +116,18 @@ namespace guecs {
     $cell_w = cell.w;
     $cell_h = cell.h;
     bar.init(cell);
-    update_percent(percent);
+    update();
   }
 
   void Meter::render(sf::RenderTarget& window, sf::Shader *shader_ptr) {
     bar.render(window, shader_ptr);
   }
 
-  void Meter::update_percent(float pct) {
-    percent = pct;
+  void Meter::update() {
+    bar.color = color;
+    bar.padding = padding;
+    bar.update();
+
     if(vertical) {
       float level = std::clamp(percent, 0.0f, 1.0f) * float($cell_h);
       sf::Vector2f size{float($cell_w) - padding * 2, std::max(level, 0.0f) - padding};

src/guecs/ui.cpp

@@ -80,11 +80,7 @@ namespace guecs {
     });
 
     query<lel::Cell, Meter>([this](auto ent, auto &cell, auto& meter) {
-      if(auto bg = get_if<Rectangle>(ent)) {
-        meter.init(cell, *bg);
-      } else {
       meter.init(cell);
-      }
     });
 
     query<lel::Cell, Text>([this](auto, auto& cell, auto& text) {
@@ -119,6 +115,16 @@ namespace guecs {
     }
   }
 
+  void UI::update() {
+    query<Rectangle>([&](auto ent, auto& rect) {
+      rect.update();
+    });
+
+    query<Meter>([&](auto ent, auto &meter) {
+      meter.update();
+    });
+  }
+
   // BUG: either render detects that the things are initialized or there's
   // another validator function I can call in debug modes to confirm they are
   void UI::render(sf::RenderTarget& window) {