From 6ec22587583ff7a7344cab5e5eec536edcb0cc13 Mon Sep 17 00:00:00 2001
From: sippeangelo <holmberg.simon@gmail.com>
Date: Sun, 17 Jan 2016 06:22:35 +0100
Subject: [PATCH] Added UniformScale component which keeps an entity's scale at
 a uniform value relative to the screen.

---
 include/Engine/Core/UniformScaleSystem.h     | 22 ++++++++++++++++++
 resources/Schema/Components.xsd              |  1 +
 resources/Schema/Components/UniformScale.xml |  4 ++++
 resources/Schema/Components/UniformScale.xsd | 16 +++++++++++++
 resources/Schema/Types/Entity.xsd            |  1 +
 src/Engine/Core/UniformScaleSystem.cpp       | 24 ++++++++++++++++++++
 6 files changed, 68 insertions(+)
 create mode 100644 include/Engine/Core/UniformScaleSystem.h
 create mode 100755 resources/Schema/Components/UniformScale.xml
 create mode 100755 resources/Schema/Components/UniformScale.xsd
 create mode 100644 src/Engine/Core/UniformScaleSystem.cpp

diff --git a/include/Engine/Core/UniformScaleSystem.h b/include/Engine/Core/UniformScaleSystem.h
new file mode 100644
index 00000000..f44409f0
--- /dev/null
+++ b/include/Engine/Core/UniformScaleSystem.h
@@ -0,0 +1,22 @@
+#ifndef UniformScaleSystem_h__
+#define UniformScaleSystem_h__
+
+#include "../GLM.h"
+#include "System.h"
+#include "../Rendering/ESetCamera.h"
+
+class UniformScaleSystem : public PureSystem
+{
+public:
+    UniformScaleSystem(EventBroker* eventBroker);
+
+    virtual void UpdateComponent(World* world, EntityWrapper& entity, ComponentWrapper& cUniformScale, double dt) override;
+
+private:
+    EntityWrapper m_Camera = EntityWrapper::Invalid;
+
+    EventRelay<UniformScaleSystem, Events::SetCamera> m_ESetCamera;
+    bool OnSetCamera(const Events::SetCamera& e);
+};
+
+#endif
\ No newline at end of file
diff --git a/resources/Schema/Components.xsd b/resources/Schema/Components.xsd
index 8d837aea..b9c8647c 100644
--- a/resources/Schema/Components.xsd
+++ b/resources/Schema/Components.xsd
@@ -18,4 +18,5 @@
 	<xs:include schemaLocation="Components/SpawnPoint.xsd"/>
 	<xs:include schemaLocation="Components/PlayerSpawn.xsd"/>
 	<xs:include schemaLocation="Components/Team.xsd"/>
+	<xs:include schemaLocation="Components/UniformScale.xsd"/>
 </xs:schema>
\ No newline at end of file
diff --git a/resources/Schema/Components/UniformScale.xml b/resources/Schema/Components/UniformScale.xml
new file mode 100755
index 00000000..0eed72d4
--- /dev/null
+++ b/resources/Schema/Components/UniformScale.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
+<UniformScale xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="UniformScale.xsd">
+	<Scale X="1" Y="1" Z="1"/>
+</UniformScale>
\ No newline at end of file
diff --git a/resources/Schema/Components/UniformScale.xsd b/resources/Schema/Components/UniformScale.xsd
new file mode 100755
index 00000000..cbd218ea
--- /dev/null
+++ b/resources/Schema/Components/UniformScale.xsd
@@ -0,0 +1,16 @@
+<?xml version="1.0"?>
+
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:t="types">
+	<xs:import schemaLocation="../Types.xsd" namespace="types"/>
+
+	<xs:element name="UniformScale">
+		<xs:annotation>
+			<xs:documentation>Keeps an entity at an uniform scale relative to the camera</xs:documentation>
+		</xs:annotation>
+		<xs:complexType>
+			<xs:all>
+				<xs:element name="Scale" type="t:Vector" minOccurs="0"/>
+			</xs:all>
+		</xs:complexType>
+	</xs:element>
+</xs:schema>
diff --git a/resources/Schema/Types/Entity.xsd b/resources/Schema/Types/Entity.xsd
index 1aaa8497..47c4d614 100644
--- a/resources/Schema/Types/Entity.xsd
+++ b/resources/Schema/Types/Entity.xsd
@@ -27,6 +27,7 @@
 							<xs:element ref="c:SpawnPoint" minOccurs="0"/>
 							<xs:element ref="c:PlayerSpawn" minOccurs="0"/>
 							<xs:element ref="c:Team" minOccurs="0"/>
+							<xs:element ref="c:UniformScale" minOccurs="0"/>
 						</xs:all>
 					</xs:complexType>
 				</xs:element>
diff --git a/src/Engine/Core/UniformScaleSystem.cpp b/src/Engine/Core/UniformScaleSystem.cpp
new file mode 100644
index 00000000..8cf670fc
--- /dev/null
+++ b/src/Engine/Core/UniformScaleSystem.cpp
@@ -0,0 +1,24 @@
+#include "Core/UniformScaleSystem.h"
+
+UniformScaleSystem::UniformScaleSystem(EventBroker* eventBroker) 
+    : System(eventBroker)
+    , PureSystem("UniformScale")
+{
+    EVENT_SUBSCRIBE_MEMBER(m_ESetCamera, &UniformScaleSystem::OnSetCamera);
+}
+
+void UniformScaleSystem::UpdateComponent(World* world, EntityWrapper& entity, ComponentWrapper& cUniformScale, double dt)
+{
+    if (!m_Camera.Valid()) {
+        return;
+    }
+
+    float distance = glm::length((glm::vec3)entity["Transform"]["Position"] - (glm::vec3&)m_Camera["Transform"]["Position"]);
+    entity["Transform"]["Scale"] = (glm::vec3&)cUniformScale["Scale"] * distance;
+}
+
+bool UniformScaleSystem::OnSetCamera(const Events::SetCamera& e)
+{
+    m_Camera = e.CameraEntity;
+    return false;
+}
\ No newline at end of file