1 files changed, 112 insertions, 0 deletions
diff --git a/src/libjin/Graphics/particles/je_particle_emitter.h b/src/libjin/Graphics/particles/je_particle_emitter.h
new file mode 100644
index 0000000..9200532
--- /dev/null
+++ b/src/libjin/Graphics/particles/je_particle_emitter.h
@@ -0,0 +1,112 @@
+#ifndef __JE_PARTICLE_EMITTER_H__
+#define __JE_PARTICLE_EMITTER_H__
+
+#include "../../common/je_temporary.h"
+#include "../../math/je_vector2.hpp"
+
+#include "je_particle.h"
+
+namespace JinEngine
+{
+    namespace Graphics
+    {
+        namespace Particles
+        {
+
+            struct PositionDef
+            {
+                bool enableRandom = false;
+                union
+                {
+                    struct
+                    {
+                        Math::Vector2<float> min;
+                        Math::Vector2<float> max;
+                    } random;
+                    Math::Vector2<float> position;
+                } position;
+            };
+
+            struct DirectionDef
+            {
+                bool enableRandom = false;
+                union
+                {
+                    struct
+                    {
+                        float min = 0;
+                        float max = 0;
+                    } random;
+                    float direction = 0;
+                } direction;
+            };
+
+            ///
+            /// How many particles emitted per second.
+            ///
+            struct EmitRateDef
+            {
+                bool enableRandom = false;
+                union
+                {
+                    struct
+                    {
+                        float min = 1;
+                        float max = 1;
+                    } random;
+                    float rate = 1;
+                } rate;
+            };
+
+            ///
+            /// Definition of particle emitter.
+            ///
+            struct ParticleEmitterDef : public Temporary
+            {
+                PositionDef positionDef;   ///< Emit position(relativily to the particle system center).
+                DirectionDef directionDef; ///< Emit direction.
+                EmitRateDef emitRateDef;   ///< Emit rate.
+            };
+
+            class ParticleSystem;
+
+            ///
+            /// Emit a single particle.
+            ///
+            class ParticleEmitter
+            {
+            public:
+                ///
+                ///
+                ///
+                ParticleEmitter(ParticleSystem& ps);
+
+                ///
+                ///
+                ///
+                void update(float dt);
+
+            private:
+                ///
+                ///
+                ///
+                ParticleSystem& mParticleSystem;
+
+                ///
+                /// Emit a particle according to emitter definition and particle definition, particle system should 
+                /// assign particle value to the particle in particle pool, but not use this return particle.
+                ///
+                void emit();
+
+                ///
+                ///
+                ///
+                float mTime;
+
+            };
+
+        } // namespace Particles
+    } // namespace Graphics
+} // namespace JinEngine
+
+#endif
+\ No newline at end of file