Work in progress

src/entity.cpp

@@ -72,9 +72,13 @@ void entity::draw() const noexcept {
   }
 
   const auto source = _props.animations.at(_props.action)[_props.frame].frame;
-  geometry::rect destination{_props.position, source.size()};
+  const auto offset = _props.animations.at(_props.action)[_props.frame].offset;
+  geometry::rect destination{_props.position + offset, source.size()};
   destination.scale(_props.scale);
 
+  if (_props.action == "dead") {
+    std::cout << ">>> offset x" << offset.x() << std::endl;
+  }
   _props.spritesheet->draw(
       source,
       destination,

src/entitymanager.cpp

@@ -41,8 +41,13 @@ std::shared_ptr<entity> entitymanager::spawn(const std::string &kind) {
         geometry::size size{f.at("width").get<int32_t>(), f.at("height").get<int32_t>()};
         geometry::rect rect{position, size};
         uint64_t duration = f.at("duration").get<uint64_t>();
+        geometry::point offset{0, 0};
+        const auto o = f.value("offset", json::object());
+        if (o.contains("x") || o.contains("y")) {
+          offset = geometry::point{o.value("x", 0), o.value("y", 0)};
+        }
 
-        keyframes.emplace_back(rect, duration);
+        keyframes.emplace_back(rect, duration, offset);
       }
     }
 

src/entityprops.hpp

@@ -11,9 +11,11 @@ namespace framework {
 struct keyframe {
   geometry::rect frame;
   uint64_t duration;
+  geometry::point offset;
 
   keyframe() = default;
-  keyframe(const geometry::rect &rect, uint64_t duration) : frame(rect), duration(duration) {}
+  keyframe(const geometry::rect &rect, uint64_t duration, const geometry::point &offset)
+      : frame(rect), duration(duration), offset(offset) {}
 };
 
 struct entityprops {

src/point.cpp

@@ -20,3 +20,7 @@ int32_t point::y() const noexcept { return _y; }
 void point::set_y(int32_t y) noexcept { _y = y; }
 
 point::operator SDL_Point() const noexcept { return SDL_Point{_x, _y}; }
+
+point point::operator+(const point &other) const noexcept {
+  return point(_x + other._x, _y + other._y);
+}

src/point.hpp

@@ -20,6 +20,8 @@ class point {
 
   operator SDL_Point() const noexcept;
 
+  point operator+(const point &other) const noexcept;
+
 private:
   int32_t _x;
   int32_t _y;