From 8032f2efec59a28128b6fe21b58a2eda43d4998a Mon Sep 17 00:00:00 2001
From: karl <karl.bittner@hexaquo.at>
Date: Fri, 13 Dec 2019 13:26:18 +0100
Subject: [PATCH] Add basic project with gravity system test

---
 .idea/ecsgame.iml |  2 ++
 .idea/misc.xml    |  7 +++++++
 .idea/modules.xml |  8 ++++++++
 .idea/vcs.xml     |  6 ++++++
 CMakeLists.txt    |  6 ++++++
 main.cpp          | 50 +++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 79 insertions(+)
 create mode 100644 .idea/ecsgame.iml
 create mode 100644 .idea/misc.xml
 create mode 100644 .idea/modules.xml
 create mode 100644 .idea/vcs.xml
 create mode 100644 CMakeLists.txt
 create mode 100644 main.cpp

diff --git a/.idea/ecsgame.iml b/.idea/ecsgame.iml
new file mode 100644
index 0000000..f08604b
--- /dev/null
+++ b/.idea/ecsgame.iml
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module classpath="CMake" type="CPP_MODULE" version="4" />
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..8822db8
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$" />
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..26103e7
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/ecsgame.iml" filepath="$PROJECT_DIR$/.idea/ecsgame.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..6fbf53f
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.15)
+project(ecsgame)
+
+set(CMAKE_CXX_STANDARD 17)
+
+add_executable(ecsgame main.cpp)
\ No newline at end of file
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..4226a0c
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,50 @@
+#include <iostream>
+#include "ECS.h"
+
+using namespace ECS;
+
+struct Position
+{
+    Position(float x, float y, float z) : x(x), y(y), z(z) {}
+    Position() : x(0.f), y(0.f), z(0.f) {}
+
+    float x;
+    float y;
+    float z;
+};
+
+class GravitySystem : public EntitySystem
+{
+public:
+    GravitySystem(float amount)
+    {
+        gravityAmount = amount;
+    }
+
+    virtual ~GravitySystem() {}
+
+    virtual void tick(World* world, float deltaTime) override
+    {
+        world->each<Position>([&](Entity* ent, ComponentHandle<Position> position) {
+            position->y += gravityAmount * deltaTime;
+        });
+    }
+
+private:
+    float gravityAmount;
+};
+
+int main() {
+    World* world = World::createWorld();
+    world->registerSystem(new GravitySystem(-9.8f));
+
+    Entity* ent = world->create();
+    ent->assign<Position>(0.f, 0.f, 0.f); // assign() takes arguments and passes them to the constructor
+
+    world->tick(1.0f);
+
+    ComponentHandle<Position> pos = ent->get<Position>();
+
+    std::cout << "y position after tick: " << pos->y << std::endl;
+    return 0;
+}