2 files changed, 75 insertions, 20 deletions

diff --git a/src/crepe/system/RenderSystem.cpp b/src/crepe/system/RenderSystem.cpp
index 96c5f27..05b7337 100644
--- a/src/crepe/system/RenderSystem.cpp
+++ b/src/crepe/system/RenderSystem.cpp
@@ -1,12 +1,16 @@
 #include <algorithm>
 #include <cassert>
+#include <cmath>
 #include <functional>
+#include <iostream>
 #include <stdexcept>
 #include <vector>
 
 #include "../ComponentManager.h"
+#include "../api/ParticleEmitter.h"
 #include "../api/Sprite.h"
 #include "../api/Transform.h"
+#include "../api/Vector2.h"
 #include "../facade/SDLContext.h"
 
 #include "RenderSystem.h"
@@ -14,9 +18,9 @@
 using namespace crepe;
 using namespace std;
 
-void RenderSystem::clear_screen() { this->context.clear_screen(); }
+void RenderSystem::clear_screen() const { this->context.clear_screen(); }
 
-void RenderSystem::present_screen() { this->context.present_screen(); }
+void RenderSystem::present_screen() const { this->context.present_screen(); }
 void RenderSystem::update_camera() {
 	ComponentManager & mgr = this->component_manager;
 
@@ -25,7 +29,7 @@ void RenderSystem::update_camera() {
 	if (cameras.size() == 0) throw std::runtime_error("No cameras in current scene");
 
 	for (Camera & cam : cameras) {
-		this->context.camera(cam);
+		this->context.set_camera(cam);
 		this->curr_cam_ref = &cam;
 	}
 }
@@ -38,7 +42,7 @@ bool sorting_comparison(const Sprite & a, const Sprite & b) {
 }
 
 std::vector<std::reference_wrapper<Sprite>>
-RenderSystem::sort(std::vector<std::reference_wrapper<Sprite>> & objs) {
+RenderSystem::sort(std::vector<std::reference_wrapper<Sprite>> & objs) const {
 
 	std::vector<std::reference_wrapper<Sprite>> sorted_objs(objs);
 	std::sort(sorted_objs.begin(), sorted_objs.end(), sorting_comparison);
@@ -46,20 +50,54 @@ RenderSystem::sort(std::vector<std::reference_wrapper<Sprite>> & objs) {
 	return sorted_objs;
 }
 
-void RenderSystem::render_sprites() {
+void RenderSystem::update() {
+	this->clear_screen();
+	this->update_camera();
+	this->render();
+	this->present_screen();
+}
+
+bool RenderSystem::render_particle(const Sprite & sprite, const double & scale) const {
+
+	ComponentManager & mgr = this->component_manager;
+
+	vector<reference_wrapper<ParticleEmitter>> emitters
+		= mgr.get_components_by_id<ParticleEmitter>(sprite.game_object_id);
+
+	bool rendering_particles = false;
+
+	for (const ParticleEmitter & em : emitters) {
+		if (!(&em.data.sprite == &sprite)) continue;
+		rendering_particles = true;
+		if (!em.active) continue;
+
+		for (const Particle & p : em.data.particles) {
+			if (!p.active) continue;
+			this->context.draw_particle(sprite, p.position, p.angle, scale,
+										*this->curr_cam_ref);
+		}
+	}
+	return rendering_particles;
+}
+void RenderSystem::render_normal(const Sprite & sprite, const Transform & tm) const {
+	this->context.draw(sprite, tm, *this->curr_cam_ref);
+}
+
+void RenderSystem::render() const {
+
 	ComponentManager & mgr = this->component_manager;
 	vector<reference_wrapper<Sprite>> sprites = mgr.get_components_by_type<Sprite>();
 	vector<reference_wrapper<Sprite>> sorted_sprites = this->sort(sprites);
 
 	for (const Sprite & sprite : sorted_sprites) {
-		auto transforms = mgr.get_components_by_id<Transform>(sprite.game_object_id);
-		this->context.draw(sprite, transforms[0], *this->curr_cam_ref);
-	}
-}
+		if (!sprite.active) continue;
+		const Transform & transform
+			= mgr.get_components_by_id<Transform>(sprite.game_object_id).front().get();
 
-void RenderSystem::update() {
-	this->clear_screen();
-	this->update_camera();
-	this->render_sprites();
-	this->present_screen();
+		bool rendered_particles = this->render_particle(sprite, transform.scale);
+
+		if (rendered_particles) continue;
+
+		this->render_normal(sprite, transform);
+	}
 }
diff --git a/src/crepe/system/RenderSystem.h b/src/crepe/system/RenderSystem.h
index 57b9c73..1a11d5b 100644
--- a/src/crepe/system/RenderSystem.h
+++ b/src/crepe/system/RenderSystem.h
@@ -6,6 +6,7 @@
 #include "facade/SDLContext.h"
 
 #include "System.h"
+#include <cmath>
 
 namespace crepe {
 
@@ -30,16 +31,33 @@ public:
 
 private:
 	//! Clears the screen in preparation for rendering.
-	void clear_screen();
+	void clear_screen() const;
 
 	//! Presents the rendered frame to the display.
-	void present_screen();
+	void present_screen() const;
 
 	//! Updates the active camera used for rendering.
 	void update_camera();
 
-	//! Renders all active sprites to the screen.
-	void render_sprites();
+	//! Renders the whole screen
+	void render() const;
+
+	/**
+	 * \brief Renders all the particles on the screen from a given sprite.
+	 *
+	 * \param sprite renders the particles with given texture
+	 * \param tm the Transform component for scale
+	 * \return true if particles have been rendered
+	 */
+	bool render_particle(const Sprite & sprite, const double & scale) const;
+
+	/**
+	 * \brief renders a sprite with a Transform component on the screen 
+	 *
+	 * \param sprite  the sprite component that holds all the data
+	 * \param tm the Transform component that holds the position,rotation and scale 
+	 */
+	void render_normal(const Sprite & sprite, const Transform & tm) const;
 
 	/**
 	 * \brief sort a vector sprite objects with
@@ -48,11 +66,10 @@ private:
 	 * \return returns a sorted reference vector
 	 */
 	std::vector<std::reference_wrapper<Sprite>>
-	sort(std::vector<std::reference_wrapper<Sprite>> & objs);
+	sort(std::vector<std::reference_wrapper<Sprite>> & objs) const;
 
 	/**
 	 * \todo Include color handling for sprites.
-	 * \todo Implement particle emitter rendering with sprites.
 	 * \todo Add text rendering using SDL_ttf for text components.
 	 * \todo Implement a text component and a button component.
 	 * \todo Ensure each sprite is checked for active status before rendering.