Fixed inverted camera, and added RegionPager::Prune()

common/region_pager.cpp

@@ -90,8 +90,8 @@ void RegionPager::DrawTo(SDL_Surface* const dest, std::list<TileSheet>* const sh
 	for (auto& regionIter : regionList) {
 		//draw the region's location
 		SDL_Rect box = {
-			Sint16(regionIter.GetX() + camX),
-			Sint16(regionIter.GetY() + camY),
+			Sint16(regionIter.GetX() - camX),
+			Sint16(regionIter.GetY() - camY),
 			Uint16(regionIter.GetWidth()),
 			Uint16(regionIter.GetHeight())
 		};
@@ -103,8 +103,8 @@ void RegionPager::DrawTo(SDL_Surface* const dest, std::list<TileSheet>* const sh
 				if (sheetIter.InRange(tileIter.tileIndex)) {
 					sheetIter.DrawTo(
 						dest,
-						tileIter.x + regionIter.GetX() + camX,
-						tileIter.y + regionIter.GetY() + camY,
+						tileIter.x + regionIter.GetX() - camX,
+						tileIter.y + regionIter.GetY() - camY,
 						tileIter.tileIndex
 					);
 					//skip to the next tile
@@ -119,4 +119,20 @@ void RegionPager::DrawTo(SDL_Surface* const dest, std::list<TileSheet>* const sh
 			//continue with the next tile
 		}
 	}
-}
+}
+
+void RegionPager::Prune(int left, int top, int right, int bottom) {
+	std::list<Region>::iterator it = regionList.begin();
+
+	while(it != regionList.end()) {
+		if (it->GetX() >= right || it->GetY() >= bottom || it->GetX() + it->GetWidth() < left || it->GetY() + it->GetHeight() < top) {
+			if (onDelete) {
+				onDelete(&(*it));
+			}
+			regionList.erase(it);
+			it = regionList.begin();
+			continue;
+		}
+		it++;
+	}
+}

common/region_pager.hpp

@@ -47,8 +47,8 @@ public:
 	void SetOnNew(regionCallback_t f) { onNew = f; }
 	void SetOnDelete(regionCallback_t f) { onDelete = f; }
 
-	//TODO
-	//void Prune(int camX, int camY, int screenW, int screenH);
+	//params: Absolute values
+	void Prune(int left, int top, int right, int bottom);
 
 	//accessors and mutators
 	int SetWidth(int i) { return regionWidth = i; }