testbed: make the rect bounce in the movement system

testbed/system/movement_system.cpp

@@ -1,5 +1,6 @@
 #include <application/context.h>
 #include <component/position_component.h>
+#include <component/rect_component.h>
 #include <component/velocity_component.h>
 #include <entt/entity/registry.hpp>
 #include <system/movement_system.h>
@@ -10,9 +11,25 @@ void movement_system(entt::registry &registry, const context &ctx, const double
     int width{};
     int height{};
 
-    for(auto [entity, position, velocity]: registry.view<position_component, velocity_component>().each()) {
+    for(auto [entity, position, velocity, rect]: registry.view<position_component, velocity_component, rect_component>().each()) {
         position.x += (velocity.dx * delta) * (ctx.logical_width() / 10.);
         position.y += velocity.dy * delta * (ctx.logical_height() / 10.);
+
+        if(position.x < 0) {
+            position.x = 0.;
+            velocity.dx = 1.;
+        } else if(auto pos = position.x + rect.w; pos > ctx.logical_width()) {
+            position.x = ctx.logical_width() - rect.w;
+            velocity.dx = -1;
+        }
+
+        if(position.y < 0) {
+            position.y = 0.;
+            velocity.dy = 1.;
+        } else if(auto pos = position.y + rect.h; pos > ctx.logical_height()) {
+            position.y = ctx.logical_height() - rect.h;
+            velocity.dy = -1;
+        }
     }
 }