From 0adda9f95dc14e81d414313fcd810a6c0cc53303 Mon Sep 17 00:00:00 2001
From: Nicolas Brignol <tools@octet-studio.com>
Date: Fri, 11 Apr 2014 13:28:08 +0200
Subject: [PATCH] Basic acceleration for Actor.

---
 src/Actor.cpp | 8 ++++++++
 src/Actor.h   | 2 ++
 src/main.cpp  | 4 +++-
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/Actor.cpp b/src/Actor.cpp
index 6714cc8..f229b94 100644
--- a/src/Actor.cpp
+++ b/src/Actor.cpp
@@ -7,11 +7,19 @@ Actor::Actor(){
     this->width = 0;
     this->height = 0;
     this->velocity = 0;
+    this->maxVelocity = 0;
+    this->acceleration = 0;
     this->name = "unknown";
 }
 
 
 void Actor::move(float elapsedMs) {
+    //acceleration
+    this->velocity *= this->acceleration;
+
+    if (this->velocity > this->maxVelocity) {
+        this->velocity = this->maxVelocity;
+    }
 
     float elapsedSec = elapsedMs / 1000;
     float move = this->velocity * elapsedSec;
diff --git a/src/Actor.h b/src/Actor.h
index 1eea308..a8304e9 100644
--- a/src/Actor.h
+++ b/src/Actor.h
@@ -12,6 +12,8 @@ class Actor {
         int height;
 
         int velocity; //in pixels per second
+        int maxVelocity;
+        float acceleration;
 
         std::string name;
 
diff --git a/src/main.cpp b/src/main.cpp
index 61de555..dd61e06 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -20,7 +20,9 @@ int main( int argc, char* args[] )
     hero->height = 158;
     hero->x = 0;
     hero->y = (WINDOW_HEIGHT/2) - hero->height/2;
-    hero->velocity = 100;
+    hero->velocity = 10;
+    hero->maxVelocity = 300;
+    hero->acceleration = 1.2;
     
     Sdl2Renderer * renderer = new Sdl2Renderer("Incrementalist step 2", WINDOW_WIDTH, WINDOW_HEIGHT);