From f0f340dec7821cee103ab9267ef941a917ef4dc4 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Sun, 18 Nov 2018 23:31:17 +0800
Subject: =?UTF-8?q?*=E7=9B=AE=E5=BD=95=E6=94=B9=E4=B8=BA=E5=B0=8F=E5=86=99?=
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---
 src/libjin/graphics/particles/je_particle.cpp | 72 +++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/libjin/graphics/particles/je_particle.cpp

(limited to 'src/libjin/graphics/particles/je_particle.cpp')

diff --git a/src/libjin/graphics/particles/je_particle.cpp b/src/libjin/graphics/particles/je_particle.cpp
new file mode 100644
index 0000000..53f4570
--- /dev/null
+++ b/src/libjin/graphics/particles/je_particle.cpp
@@ -0,0 +1,72 @@
+#include "../../math/je_math.h"
+
+#include "je_particle.h"
+
+using namespace JinEngine::Math;
+
+namespace JinEngine
+{
+    namespace Graphics
+    {
+        namespace Particles
+        {
+
+            Particle::Particle(const Graphic* grc)
+                : graphic(grc)
+            {
+                reset();
+            }
+
+            void Particle::reset()
+            {
+                transform.set(0, 0, 1, 1, 0, 0, 0);
+                lifeTime = 1.0f; 
+                life = 0.0f; 
+                speed.set(0, 0); 
+                linearAcceleration.set(0, 0); 
+                radialAcceleration = 0.0f; 
+                angularSpeed = 0;
+                scaleBegin = 1;
+                scaleEnd = 1;
+                color = Color::WHITE;
+                colorStart = Color::WHITE;
+                colorEnd = Color::WHITE;
+                alive = true;
+            }
+
+            void Particle::update(float dt)
+            {
+                float t = life / lifeTime;
+                // Lerp color 
+                color.r = lerp<int>(colorStart.r, colorEnd.r, t);
+                color.g = lerp<int>(colorStart.g, colorEnd.g, t);
+                color.b = lerp<int>(colorStart.b, colorEnd.b, t);
+                color.a = lerp<int>(colorStart.a, colorEnd.a, t);
+                // Lerp scale.
+                Vector2<float> scale = transform.getScale();
+                scale.x = lerp<float>(scaleBegin, scaleEnd, t);
+                scale.y = scale.x;
+                transform.setScale(scale.x, scale.y);
+                // Calculate position.
+                speed += linearAcceleration * dt;
+                transform.move(speed * dt);
+                // Calculate rotation.
+                angularSpeed += radialAcceleration * dt;
+                transform.rotate(angularSpeed * dt);
+                // Update life time.
+                life += dt;
+                alive = life < lifeTime;
+            }
+
+            void Particle::render()
+            {
+                Color c = gl.getColor();
+                gl.setColor(color);
+                if (graphic != nullptr)
+                    graphic->render(transform);
+                gl.getColor();
+            }
+
+        }
+    }
+}
\ No newline at end of file
-- 
cgit v1.1-26-g67d0