From f650bea7ad4e9b2960105dfe67b637335b5680af Mon Sep 17 00:00:00 2001
From: Gulum <julian.niessner@mni.thm.de>
Date: Thu, 19 Oct 2017 01:28:40 +0200
Subject: [PATCH] Implemented render Prediction

---
 core/src/com/darkrp2d/DarkRP2D.java                   | 8 ++++----
 core/src/com/darkrp2d/entitySystems/RenderSystem.java | 9 +++++++--
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/core/src/com/darkrp2d/DarkRP2D.java b/core/src/com/darkrp2d/DarkRP2D.java
index f6e9bc5..c615bf7 100755
--- a/core/src/com/darkrp2d/DarkRP2D.java
+++ b/core/src/com/darkrp2d/DarkRP2D.java
@@ -67,7 +67,7 @@ public class DarkRP2D extends Game {
 	@Override
         // GameLoop
 	public void render () {
-                accumulator += Gdx.graphics.getDeltaTime(); //Seconds to milliseconds
+                accumulator += Gdx.graphics.getRawDeltaTime(); //Seconds to milliseconds
                 
                 //Process Input
                 Command currentCommand = CommandStream.pollCommand();
@@ -84,7 +84,7 @@ public class DarkRP2D extends Game {
                     skippedFrames++;
                 }
                 
-                trueRender();
+                trueRender(accumulator / MS_PER_UPDATE);
 	}
         
         public void update(float deltaTime) {
@@ -92,7 +92,7 @@ public class DarkRP2D extends Game {
             engine.update(deltaTime);
         }
         
-        public void trueRender() {
+        public void trueRender(float delta) {
                 Gdx.gl.glClearColor(0.f, 0.f, 0.f, 1.f);
                 Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
                 
@@ -108,7 +108,7 @@ public class DarkRP2D extends Game {
                 b2dbr.render(world, debugMatrix);
                 
                 //TODO: will be later moved to Gamescreen
-                engine.getSystem(RenderSystem.class).render(batch);
+                engine.getSystem(RenderSystem.class).render(delta, batch);
                     
                 //some testdrawing
                 batch.begin();
diff --git a/core/src/com/darkrp2d/entitySystems/RenderSystem.java b/core/src/com/darkrp2d/entitySystems/RenderSystem.java
index bbedad3..230c5ee 100644
--- a/core/src/com/darkrp2d/entitySystems/RenderSystem.java
+++ b/core/src/com/darkrp2d/entitySystems/RenderSystem.java
@@ -11,6 +11,7 @@ import com.badlogic.ashley.core.EntitySystem;
 import com.badlogic.ashley.core.Family;
 import com.badlogic.ashley.utils.ImmutableArray;
 import com.badlogic.gdx.graphics.g2d.SpriteBatch;
+import com.badlogic.gdx.math.Vector2;
 
 import com.darkrp2d.entities.components.Mappers;
 import com.darkrp2d.entities.components.PhysicComponent;
@@ -33,14 +34,18 @@ public class RenderSystem extends EntitySystem {
         entities = engine.getEntitiesFor(Family.all(TextureComponent.class, PhysicComponent.class).get());
     }
     
-    public void render(SpriteBatch batch) {
+    public void render(float delta, SpriteBatch batch) {
         batch.begin();
         for (int i = 0; i < entities.size(); ++i) {
 			Entity entity = entities.get(i);
 			PhysicComponent physics = Mappers.physicComponentMapper.get(entity);
 			TextureComponent texture = Mappers.textureComponentMapper.get(entity);
                         
-                        batch.draw(texture.tex, Box2DUtils.worldToScreen(physics.body.getPosition().x) - texture.tex.getWidth() / 2, Box2DUtils.worldToScreen(physics.body.getPosition().y)  - texture.tex.getHeight()/2);
+                        Vector2 vel = physics.body.getLinearVelocity();
+                        vel.scl(1.f/60.f);
+                        vel.scl(delta);
+                        
+                        batch.draw(texture.tex, Box2DUtils.worldToScreen(physics.body.getPosition().x + vel.x) - texture.tex.getWidth() / 2, Box2DUtils.worldToScreen(physics.body.getPosition().y + vel.y)  - texture.tex.getHeight()/2);
 		}
         batch.end();
     }