4 files changed, 85 insertions, 45 deletions

diff --git a/src/crepe/facade/DB.cpp b/src/crepe/facade/DB.cpp
index d5d19dc..95cf606 100644
--- a/src/crepe/facade/DB.cpp
+++ b/src/crepe/facade/DB.cpp
@@ -18,8 +18,8 @@ DB::DB(const string & path) {
 	this->db = {db, [](libdb::DB * db) { db->close(db, 0); }};
 
 	// load or create database file
-	ret = this->db->open(this->db.get(), NULL, path.c_str(), NULL, libdb::DB_BTREE, DB_CREATE,
-						 0);
+	const char * file = path.empty() ? NULL : path.c_str();
+	ret = this->db->open(this->db.get(), NULL, file, NULL, libdb::DB_BTREE, DB_CREATE, 0);
 	if (ret != 0) throw runtime_error(format("db->open: {}", libdb::db_strerror(ret)));
 
 	// create cursor
diff --git a/src/crepe/facade/DB.h b/src/crepe/facade/DB.h
index 629b0eb..115c0f1 100644
--- a/src/crepe/facade/DB.h
+++ b/src/crepe/facade/DB.h
@@ -22,8 +22,10 @@ class DB {
 public:
 	/**
 	 * \param path  The path of the database (created if nonexistant)
+	 *
+	 * \note If \p path is empty, the database is entirely in-memory
 	 */
-	DB(const std::string & path);
+	DB(const std::string & path = "");
 	virtual ~DB() = default;
 
 public:
diff --git a/src/crepe/facade/SDLContext.cpp b/src/crepe/facade/SDLContext.cpp
index f2daada..d352ea6 100644
--- a/src/crepe/facade/SDLContext.cpp
+++ b/src/crepe/facade/SDLContext.cpp
@@ -1,5 +1,6 @@
 #include <SDL2/SDL.h>
 #include <SDL2/SDL_image.h>
+#include <SDL2/SDL_keycode.h>
 #include <SDL2/SDL_rect.h>
 #include <SDL2/SDL_render.h>
 #include <SDL2/SDL_surface.h>
@@ -7,13 +8,15 @@
 #include <cmath>
 #include <cstddef>
 #include <functional>
-#include <iostream>
 #include <memory>
+#include <stdexcept>
 #include <string>
 
+#include "../api/Camera.h"
 #include "../api/Sprite.h"
 #include "../api/Texture.h"
 #include "../api/Transform.h"
+#include "../api/Vector2.h"
 #include "../util/Log.h"
 
 #include "SDLContext.h"
@@ -30,29 +33,21 @@ SDLContext::SDLContext() {
 	dbg_trace();
 	// FIXME: read window defaults from config manager
 
-	if (SDL_Init(SDL_INIT_VIDEO) < 0) {
-		// FIXME: throw exception
-		std::cerr << "SDL could not initialize! SDL_Error: " << SDL_GetError() << std::endl;
-		return;
+	if (SDL_Init(SDL_INIT_VIDEO) != 0) {
+		throw runtime_error(format("SDLContext: SDL_Init error: {}", SDL_GetError()));
 	}
 	SDL_Window * tmp_window
 		= SDL_CreateWindow("Crepe Game Engine", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
 						   this->viewport.w, this->viewport.h, 0);
 	if (!tmp_window) {
-		// FIXME: throw exception
-		std::cerr << "Window could not be created! SDL_Error: " << SDL_GetError() << std::endl;
-		return;
+		throw runtime_error(format("SDLContext: SDL_Window error: {}", SDL_GetError()));
 	}
 	this->game_window = {tmp_window, [](SDL_Window * window) { SDL_DestroyWindow(window); }};
 
 	SDL_Renderer * tmp_renderer
 		= SDL_CreateRenderer(this->game_window.get(), -1, SDL_RENDERER_ACCELERATED);
 	if (!tmp_renderer) {
-		// FIXME: throw exception
-		std::cerr << "Renderer could not be created! SDL_Error: " << SDL_GetError()
-				  << std::endl;
-		SDL_DestroyWindow(this->game_window.get());
-		return;
+		throw runtime_error(format("SDLContext: SDL_CreateRenderer error: {}", SDL_GetError()));
 	}
 
 	this->game_renderer
@@ -60,9 +55,7 @@ SDLContext::SDLContext() {
 
 	int img_flags = IMG_INIT_PNG;
 	if (!(IMG_Init(img_flags) & img_flags)) {
-		// FIXME: throw exception
-		std::cout << "SDL_image could not initialize! SDL_image Error: " << IMG_GetError()
-				  << std::endl;
+		throw runtime_error("SDLContext: SDL_image could not initialize!");
 	}
 }
 
@@ -103,40 +96,63 @@ void SDLContext::handle_events(bool & running) {
 void SDLContext::clear_screen() { SDL_RenderClear(this->game_renderer.get()); }
 void SDLContext::present_screen() { SDL_RenderPresent(this->game_renderer.get()); }
 
-void SDLContext::draw(const Sprite & sprite, const Transform & transform, const Camera & cam) {
-
-	SDL_RendererFlip render_flip
-		= (SDL_RendererFlip) ((SDL_FLIP_HORIZONTAL * sprite.flip.flip_x)
-							  | (SDL_FLIP_VERTICAL * sprite.flip.flip_y));
-
-	double adjusted_x = (transform.position.x - cam.x) * cam.zoom;
-	double adjusted_y = (transform.position.y - cam.y) * cam.zoom;
-	double adjusted_w = sprite.sprite_rect.w * transform.scale * cam.zoom;
-	double adjusted_h = sprite.sprite_rect.h * transform.scale * cam.zoom;
-
-	SDL_Rect srcrect = {
+SDL_Rect SDLContext::get_src_rect(const Sprite & sprite) const {
+	return SDL_Rect{
 		.x = sprite.sprite_rect.x,
 		.y = sprite.sprite_rect.y,
 		.w = sprite.sprite_rect.w,
 		.h = sprite.sprite_rect.h,
 	};
+}
+SDL_Rect SDLContext::get_dst_rect(const Sprite & sprite, const Vector2 & pos,
+								  const double & scale, const Camera & cam) const {
+
+	double adjusted_x = (pos.x - cam.x) * cam.zoom;
+	double adjusted_y = (pos.y - cam.y) * cam.zoom;
+	double adjusted_w = sprite.sprite_rect.w * scale * cam.zoom;
+	double adjusted_h = sprite.sprite_rect.h * scale * cam.zoom;
 
-	SDL_Rect dstrect = {
+	return SDL_Rect{
 		.x = static_cast<int>(adjusted_x),
 		.y = static_cast<int>(adjusted_y),
 		.w = static_cast<int>(adjusted_w),
 		.h = static_cast<int>(adjusted_h),
 	};
+}
+
+void SDLContext::draw_particle(const Sprite & sprite, const Vector2 & pos,
+							   const double & angle, const double & scale,
+							   const Camera & camera) {
+
+	SDL_RendererFlip render_flip
+		= (SDL_RendererFlip) ((SDL_FLIP_HORIZONTAL * sprite.flip.flip_x)
+							  | (SDL_FLIP_VERTICAL * sprite.flip.flip_y));
+
+	SDL_Rect srcrect = this->get_src_rect(sprite);
+	SDL_Rect dstrect = this->get_dst_rect(sprite, pos, scale, camera);
+
+	SDL_RenderCopyEx(this->game_renderer.get(), sprite.sprite_image->texture.get(), &srcrect,
+					 &dstrect, angle, NULL, render_flip);
+}
+
+void SDLContext::draw(const Sprite & sprite, const Transform & transform, const Camera & cam) {
+
+	SDL_RendererFlip render_flip
+		= (SDL_RendererFlip) ((SDL_FLIP_HORIZONTAL * sprite.flip.flip_x)
+							  | (SDL_FLIP_VERTICAL * sprite.flip.flip_y));
+
+	SDL_Rect srcrect = this->get_src_rect(sprite);
+	SDL_Rect dstrect = this->get_dst_rect(sprite, transform.position, transform.scale, cam);
 
 	SDL_RenderCopyEx(this->game_renderer.get(), sprite.sprite_image->texture.get(), &srcrect,
 					 &dstrect, transform.rotation, NULL, render_flip);
 }
 
-void SDLContext::camera(const Camera & cam) {
+void SDLContext::set_camera(const Camera & cam) {
 	this->viewport.w = static_cast<int>(cam.aspect_width);
 	this->viewport.h = static_cast<int>(cam.aspect_height);
-	this->viewport.x = static_cast<int>(cam.x) - (SCREEN_WIDTH / 2);
-	this->viewport.y = static_cast<int>(cam.y) - (SCREEN_HEIGHT / 2);
+	this->viewport.x = static_cast<int>(cam.x) - (this->viewport.w / 2);
+	this->viewport.y = static_cast<int>(cam.y) - (this->viewport.h / 2);
 
 	SDL_SetRenderDrawColor(this->game_renderer.get(), cam.bg_color.r, cam.bg_color.g,
 						   cam.bg_color.b, cam.bg_color.a);
@@ -148,9 +164,8 @@ std::unique_ptr<SDL_Texture, std::function<void(SDL_Texture *)>>
 SDLContext::texture_from_path(const std::string & path) {
 
 	SDL_Surface * tmp = IMG_Load(path.c_str());
-	if (tmp == nullptr) {
-		tmp = IMG_Load("asset/texture/ERROR.png");
-	}
+	if (tmp == nullptr)
+		throw runtime_error(format("SDLContext: IMG_Load error: {}", SDL_GetError()));
 
 	std::unique_ptr<SDL_Surface, std::function<void(SDL_Surface *)>> img_surface;
 	img_surface = {tmp, [](SDL_Surface * surface) { SDL_FreeSurface(surface); }};
@@ -159,7 +174,7 @@ SDLContext::texture_from_path(const std::string & path) {
 		= SDL_CreateTextureFromSurface(this->game_renderer.get(), img_surface.get());
 
 	if (tmp_texture == nullptr) {
-		throw runtime_error(format("Texture cannot be load from {}", path));
+		throw runtime_error(format("SDLContext: Texture cannot be load from {}", path));
 	}
 
 	std::unique_ptr<SDL_Texture, std::function<void(SDL_Texture *)>> img_texture;
diff --git a/src/crepe/facade/SDLContext.h b/src/crepe/facade/SDLContext.h
index 652a83e..841ffc9 100644
--- a/src/crepe/facade/SDLContext.h
+++ b/src/crepe/facade/SDLContext.h
@@ -1,8 +1,10 @@
 #pragma once
 
 #include <SDL2/SDL_keycode.h>
+#include <SDL2/SDL_rect.h>
 #include <SDL2/SDL_render.h>
 #include <SDL2/SDL_video.h>
+#include <cmath>
 #include <functional>
 #include <memory>
 #include <string>
@@ -10,10 +12,7 @@
 #include "../api/Sprite.h"
 #include "../api/Transform.h"
 #include "api/Camera.h"
-
-// FIXME: this needs to be removed
-const int SCREEN_WIDTH = 640;
-const int SCREEN_HEIGHT = 480;
+#include "api/Vector2.h"
 
 namespace crepe {
 
@@ -121,6 +120,9 @@ private:
 	 */
 	void draw(const Sprite & sprite, const Transform & transform, const Camera & camera);
 
+	void draw_particle(const Sprite & sprite, const Vector2 & pos, const double & angle,
+					   const double & scale, const Camera & camera);
+
 	//! Clears the screen, preparing for a new frame.
 	void clear_screen();
 
@@ -128,10 +130,31 @@ private:
 	void present_screen();
 
 	/**
-	 * \brief Sets the current camera for rendering.
+	 * \brief sets the background of the camera (will be adjusted in future PR)
 	 * \param camera Reference to the Camera object.
 	 */
-	void camera(const Camera & camera);
+	void set_camera(const Camera & camera);
+
+private:
+	/**
+	 * \brief calculates the sqaure size of the image
+	 *
+	 * \param sprite Reference to the sprite to calculate the rectangle
+	 * \return sdl rectangle to draw a src image
+	 */
+	SDL_Rect get_src_rect(const Sprite & sprite) const;
+	/**
+	 * \brief calculates the sqaure size of the image for an destination
+	 *
+	 * \param sprite Reference to the sprite to calculate the rectangle
+	 * \param pos the pos in pixel positions
+	 * \param scale the multiplier to increase of decrease for the specified sprite 
+	 * \param cam Reference to the current camera in the scene to calculate the position based
+	 * on the camera 
+	 * \return sdl rectangle to draw a dst image to draw on the screen
+	 */
+	SDL_Rect get_dst_rect(const Sprite & sprite, const Vector2 & pos, const double & scale,
+						  const Camera & cam) const;
 
 private:
 	//! sdl Window