.. _program_listing_file_gui_Entities_E_CameraControler.hpp:

Program Listing for File E_CameraControler.hpp
==============================================

|exhale_lsh| :ref:`Return to documentation for file <file_gui_Entities_E_CameraControler.hpp>` (``gui/Entities/E_CameraControler.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #pragma once
   
   #include <glm/gtc/matrix_transform.hpp>
   
   #include "Demeter/Demeter.hpp"
   #include "Demeter/Entity.hpp"
   #include "Demeter/Renderer/Camera.hpp"
   #include "SDL_mouse.h"
   #include "SDL_scancode.h"
   
   class E_CameraControler : public Dem::IEntity {
   private:
     static constexpr float vel = 5;
     static constexpr float sensitivity = 0.5F;
     static constexpr float zoomSpeed = 10.0F;
   
   public:
     bool Init(Dem::Demeter &) override
     {
       return true;
     }
   
     bool Update(Dem::Demeter &d) override
     {
       float dt = d.GetTime().GetDelta();
   
       // Input handling
       glm::vec3 position = d.camera.GetPosition();
       if (d.GetInput().keys[SDL_SCANCODE_UP])
         position += d.camera.GetFront() * dt * vel * zoomSpeed;
       if (d.GetInput().keys[SDL_SCANCODE_DOWN])
         position -= d.camera.GetFront() * dt * vel * zoomSpeed;
       if (d.GetInput().keys[SDL_SCANCODE_LEFT])
         position -=
           glm::normalize(glm::cross(d.camera.GetFront(), d.camera.GetUp())) * dt
           * vel;
       if (d.GetInput().keys[SDL_SCANCODE_RIGHT])
         position +=
           glm::normalize(glm::cross(d.camera.GetFront(), d.camera.GetUp())) * dt
           * vel;
   
       if (d.GetInput().keys[SDL_SCANCODE_SPACE])
         position += d.camera.GetUp() * dt * vel;
       if (d.GetInput().keys[SDL_SCANCODE_LCTRL])
         position -= d.camera.GetUp() * dt * vel;
       d.camera.SetPosition(position);
   
       float yaw = d.camera.GetYaw();
       float pitch = d.camera.GetPitch();
       if (d.GetInput().mouseButtons[SDL_BUTTON_MIDDLE]) {
         if (d.GetInput().mouseX > 0)
           yaw += 5.0F * d.GetInput().mouseDeltaX * dt * sensitivity;
         if (d.GetInput().mouseX < 0)
           yaw -= 5.0F * d.GetInput().mouseDeltaX * dt * sensitivity;
         if (d.GetInput().mouseY > 0)
           pitch -= 5.0F * d.GetInput().mouseDeltaY * dt * sensitivity;
         if (d.GetInput().mouseY < 0)
           pitch += 5.0F * d.GetInput().mouseDeltaY * dt * sensitivity;
         d.camera.SetRotation(yaw, pitch);
       }
       // std::cout
       //   << std::fixed << std::setprecision(2) << "Camera: pos "
       //   << d.camera.GetPosition().x << ", " << d.camera.GetPosition().y << ",
       //   "
       //   << d.camera.GetPosition().z << "\t"
       //   << "| yaw " << yaw << "\t"
       //   << "| pitch " << pitch << "\t"
       //   << "| front " << d.camera.GetFront().x << ", " <<
       //   d.camera.GetFront().y
       //   << ", " << d.camera.GetFront().z << "\t"
       //   << "| dt " << dt << "\n";
       return true;
     }
   
     bool Draw(Dem::Demeter &) override
     {
       return true;
     }
   };