From 8ab5afd3c4761274d0423657bdfdd801b345fe23 Mon Sep 17 00:00:00 2001
From: mushgunAX <mushgun_ax@hotmail.com>
Date: Sun, 25 Sep 2022 16:39:01 +0800
Subject: [PATCH] first version of IM ready for PR

---
 .../src/Application/SBApplication.cpp         |  4 ++++
 .../src/Input/SHInputManagerSystem.cpp        |  6 ++++++
 SHADE_Engine/src/Input/SHInputManagerSystem.h | 21 +++++++++++++++++++
 3 files changed, 31 insertions(+)

diff --git a/SHADE_Application/src/Application/SBApplication.cpp b/SHADE_Application/src/Application/SBApplication.cpp
index bb4ccc35..7ef8adfe 100644
--- a/SHADE_Application/src/Application/SBApplication.cpp
+++ b/SHADE_Application/src/Application/SBApplication.cpp
@@ -23,6 +23,7 @@
 #include "Graphics/MiddleEnd/Interface/SHRenderable.h"
 #include "Scene/SHSceneManager.h"
 #include "Math/Transform/SHTransformSystem.h"
+#include "Input/SHInputManagerSystem.h"
 
 #include "Scenes/SBTestScene.h"
 #include "Math/Transform/SHTransformComponent.h"
@@ -52,6 +53,7 @@ namespace Sandbox
     SHADE::SHSystemManager::CreateSystem<SHADE::SHTransformSystem>();
     SHADE::SHSystemManager::CreateSystem<SHADE::SHGraphicsSystem>();
     SHADE::SHGraphicsSystem* graphicsSystem = static_cast<SHADE::SHGraphicsSystem*>(SHADE::SHSystemManager::GetSystem<SHADE::SHGraphicsSystem>());
+    SHADE::SHSystemManager::CreateSystem<SHADE::SHInputManagerSystem>();
     
     // Create Routines
     SHADE::SHSystemManager::RegisterRoutine<SHADE::SHScriptEngine, SHADE::SHScriptEngine::FrameSetUpRoutine>();
@@ -71,6 +73,8 @@ namespace Sandbox
 
     SHADE::SHComponentManager::CreateComponentSparseSet<SHADE::SHRenderable>();
     SHADE::SHComponentManager::CreateComponentSparseSet<SHADE::SHTransformComponent>();
+
+    SHADE::SHSystemManager::RegisterRoutine<SHADE::SHInputManagerSystem, SHADE::SHInputManagerSystem::InputManagerRoutine>();
     
     // Set up graphics system and windows
     graphicsSystem->SetWindow(&window);
diff --git a/SHADE_Engine/src/Input/SHInputManagerSystem.cpp b/SHADE_Engine/src/Input/SHInputManagerSystem.cpp
index cbc49d7d..1beabe3f 100644
--- a/SHADE_Engine/src/Input/SHInputManagerSystem.cpp
+++ b/SHADE_Engine/src/Input/SHInputManagerSystem.cpp
@@ -35,6 +35,8 @@ namespace SHADE
   int SHInputManagerSystem::mouseScreenY = 0;
   int SHInputManagerSystem::mouseScreenXLast = 0;
   int SHInputManagerSystem::mouseScreenYLast = 0;
+  double SHInputManagerSystem::mouseVelocityX = 0;
+  double SHInputManagerSystem::mouseVelocityY = 0;
   int SHInputManagerSystem::mouseWheelVerticalDelta = 0;
   int SHInputManagerSystem::mouseWheelVerticalDeltaPoll = 0;
 
@@ -126,6 +128,10 @@ namespace SHADE
     //Mouse Positioning/////////////////////////////////////
     //https://stackoverflow.com/a/6423739
 
+    //Set last positioning
+    mouseScreenXLast = mouseScreenX;
+    mouseScreenYLast = mouseScreenY;
+
     //Get cursor position, even when it is outside window
     POINT p;
     GetCursorPos(&p);
diff --git a/SHADE_Engine/src/Input/SHInputManagerSystem.h b/SHADE_Engine/src/Input/SHInputManagerSystem.h
index 6ee73ae9..77d8f8fd 100644
--- a/SHADE_Engine/src/Input/SHInputManagerSystem.h
+++ b/SHADE_Engine/src/Input/SHInputManagerSystem.h
@@ -420,6 +420,16 @@ namespace SHADE
       if (y) *y = mouseScreenY;
     }
 
+    //Get the mouse velocity
+    //Two output parameters for x and y velocitites
+    //In pixels per second for both
+    static inline void GetMouseVelocity(double* x = nullptr,
+      double* y = nullptr) noexcept
+    {
+      if (x) *x = mouseVelocityX;
+      if (y) *y = mouseVelocityY;
+    }
+
     //Get the mouse wheel vertical delta
     static inline int GetMouseWheelVerticalDelta() noexcept
     {
@@ -529,15 +539,26 @@ namespace SHADE
     //MOUSE VARIABLES///////////////////////////////////////////////////////////
 
     //Present horizontal positioning of the mouse WRT the screen
+    //Increasing rightwards
     static int mouseScreenX;
     //Present vertical positioning of the mouse WRT the screen
+    //Increasing downwards
     static int mouseScreenY;
 
     //Horizontal positioning of the mouse WRT screen in last frame
+    //Increasing rightwards
     static int mouseScreenXLast;
     //Vertical positioning of the mouse WRT screen in the last frame
+    //Increasing downwards
     static int mouseScreenYLast;
 
+    //The velocity at which the mouse is being moved horizontally (px/s)
+    //Rightwards is positive
+    static double mouseVelocityX;
+    //The velocity at which the mouse is being moved vertically (px/s)
+    //Downwards is positive
+    static double mouseVelocityY;
+
     //For polling mouse wheel events, not to be read
     static int mouseWheelVerticalDeltaPoll;
     //Mouse wheel vertical rotation speed. Positive is rotation AWAY from user