commit aa03bf3a2181a09a79291cc02ed1aa91d9e55956
Author: thecookingsenpai <elmastrococinero@gmail.com>
Date:   Mon Dec 25 13:24:14 2023 +0100

    Initial commit

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+
+README.pdf
+
+.luacheckrc
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+# 3DSenpai
+
+This documentation describes how the 3DSenpai engine works.
+
+3DSenpai is a 2D (despite the name) engine that manages the logic and the GUI of Nintendo 3DS
+homebrews that use [Lua Player Plus 3DS engine](https://github.com/Rinnegatamante/lpp-3ds) by [Rinnegatamante](https://rinnegatamante.it/).
+
+Despite being tought for creating games, it is totally possible to use the engine to create
+graphical applications (e.g. managing navigation, menus, etc).
+
+## Attached Example
+
+The attached example (index.lua) contains a demo application that shows how to use the engine.
+Feel free to use it as a reference and a starting point for your applications.
+
+## Global objects
+
+To better manage the workflow of the game, some global objects are created at runtime and
+are accessed during the game loop.
+
+### Program
+
+This object contains informations about the game such as author, version, title and so on.
+
+### emptyElement
+
+This object is a prototype of an empty element that is used to initialize an element and standardize its properties.
+
+### Scene
+
+This object contains the character object, the currentScene property, the imagesToDraw table
+and the environment object.
+
+#### Scene.environment
+
+This is the most important object of the scene. It represents every pixel as a tile and is used to define, determine and manipulate the position and behavior of the elements in the scene.
+
+It contains a size property with the width and height of the screen and the matrix table which is initialized by the setScene function as a 2D array representing every tile content. It is
+accessed through:
+
+    Scene.environment.matrix[x][y]
+
+## initalLoad
+
+This method is called just after all the variables have been initialized.
+Normally, you would use it to set the first scene through setScene method and load
+everything you need to start the game.
+
+### setScene
+
+This method accepts a scene method that is called to obtain the desired scene properties.
+Additionally, it resets the Scene.environment.matrix property to the default values.
+These properties are then assigned to the Scene.currentScene and Scene.imagesToDraw objects.
+
+### Scene methods
+
+These methods are to be created by the developer.
+For setScene to be effective, the scene method should return a table containing two booleans
+that define whether or not the background and the main character should be drawn, and a table containing every element that should be drawn.
+
+## The main loop
+
+The game engine revolves around a mainLoop function that keep calling
+keyEvents and mainGUI functions.
+
+## keyEvents
+
+This function keep the inputs monitored for key events and react consequently.
+
+## mainGUI
+
+This function loads the Scene object and, if specified, draws both the background and
+the main character.
+
+Then, if any, it parses the Scene.imagesToDraw table and draws the elements images that
+are specified in it.
+
+## Elements methods
+
+These methods are a set of functions that help the developer create, manage and inspect elements in the current scene.
+
+### isElement
+
+This function returns wheter or not an element covers the specified coordinates (x and y).
+A boolean is returned.
+
+### elementPosition
+
+If an element is in the elementsTable table, it returns the element object. Else, it returns nil.
+
+### placeElement
+
+This function is used to place an element in the scene.
+It checks whether the element is already placed and if the tiles that should be covered are free
+or not.
+It returns a boolean and a string containing the result of the operation.
+
+### removeElement
+
+This function removes an element from the scene by checking its existence and position through the elementsTable and the the scene environment.Matrix.
+
+### checkTileCollision
+
+Given a set of coordinates (x and y), this function checks whether there is an element that covers the specified coordinates and if the element has the Collision property set to true.
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+Screen.disable3D() --Disabling 3D for the top screen
+
+-- SECTION Program object
+local Program = {
+    title = "3DSenpai",
+    dir = "0_LPP_Test"
+}
+-- !SECTION Program object
+
+-- SECTION Misc objects
+local emptyElement = {
+    Element = nil, -- name of the element
+    Type = 0, -- 0 = empty, 1 = element, 2 = creature, 3 = object
+    Collision = false, -- true / false
+    Size = { 0, 0 }, -- Size of the element
+    StartingPosition = { 0, 0 }, -- Starting position of the element
+    Image = nil, -- Image of the element (object)
+    Screen = TOP_SCREEN, -- Screen of the element
+    Properties = {} -- Properties of the element (e.g. health, damage, etc.)
+}
+
+local elementsTable = {} -- {name = {x,y}}
+-- !SECTION Misc objects
+
+-- SECTION Elements object
+local Scene = {
+    environment = {
+        size = { x = 400, y = 240 },
+        matrix = {}
+    },
+    character = {
+        image = "assets/character.png",
+        imageLoaded = nil,
+        position = { x = 176, y = 96 }
+    },
+    currentScene = nil, -- Current scene method
+    imagesToDraw = {} -- A table containing the images to draw each frame
+}
+-- !SECTION Elements object
+
+-- SECTION Scenes
+-- Scenes are functions that are called to draw the scene on the screen at the
+-- beginning of the program or when the user changes the scene (e.g. next level)
+local firstLevel = function ()
+    local isBackground = true
+    local isCharacter = true
+    local imagesToDraw = {}
+    return {isBackground, isCharacter}, imagesToDraw
+end
+-- !SECTION Scenes
+
+local setScene = function (scene) -- Sets the current scene method
+    -- Reset the environment matrix
+    for i = 1, Scene.environment.size.x do
+        Scene.environment.matrix[i] = {}
+        -- Each pixel of the environment contains the informations about the element on it (if any)
+        for j = 1, Scene.environment.size.y do
+            Scene.environment.matrix[i][j] = {emptyElement}
+        end
+    end
+    local settings = scene() -- Call the scene method that returns settings and images to draw
+    Scene.currentScene = settings[0]
+    Scene.imagesToDraw = settings[1]
+    return true
+end
+
+local initialLoad = function ()
+    System.currentDirectory("/3ds/" .. Program.dir .. "/")
+    Scene.character.imageLoaded = Screen.loadImage(System.currentDirectory()
+                                                   .. Scene.character.image)
+    -- Setting the first scene
+    setScene(firstLevel)
+end
+
+-- SECTION Controls check
+local keyEvents = function ()
+    local pad = Controls.read() -- Read Controls
+    if (Controls.check(pad, KEY_START)) then -- check if start is pressed
+        System.exit() -- Exit back to HBL
+    -- Movements with bounds
+    elseif (Controls.check(pad, KEY_DUP)) then
+        Scene.character.position.y = Scene.character.position.y - 1
+        if (Scene.character.position.y > 195) then
+            Scene.character.position.y = 195
+        end
+    elseif (Controls.check(pad, KEY_DDOWN)) then
+        Scene.character.position.y = Scene.character.position.y + 1
+        if (Scene.character.position.y < 5) then
+            Scene.character.position.y = 5
+        end
+    elseif (Controls.check(pad, KEY_DRIGHT)) then
+        Scene.character.position.x = Scene.character.position.x + 1
+        if (Scene.character.position.x > 355) then
+            Scene.character.position.x = 355
+        end
+    elseif (Controls.check(pad, KEY_DLEFT)) then
+        Scene.character.position.x = Scene.character.position.x - 1
+        if (Scene.character.position.x < 5) then
+            Scene.character.position.x = 5
+        end
+    end
+end
+-- !SECTION Controls check
+
+local mainGUI = function ()
+   -- Load the current scene
+   local isBackground = Scene.currentScene[1]
+   local isCharacter = Scene.currentScene[2]
+   -- Draw the background
+   if (isBackground) then
+       Screen.fillRect(5, 395, 5, 235, Color.new(255, 0, 0), TOP_SCREEN)
+   end
+   -- Draw the character
+   if (isCharacter) then
+       Screen.drawImage(Scene.character.position.x, Scene.character.position.y,
+                        Scene.character.imageLoaded, TOP_SCREEN)
+   end
+   -- Draw the images listed in the imagesToDraw table
+   for i, image in pairs(Scene.imagesToDraw) do
+       -- REVIEW Should the element be placed in the scene here with 'i'?
+       Screen.drawImage(image.StartingPosition[0], image.StartingPosition[1],
+                        image.Image, image.Screen)
+   end
+end
+
+-- SECTION Methods
+local isElement = function (x, y)
+    if (Scene.environment.matrix[x][y].Element == nil) then
+        return false
+    else
+        return true
+    end
+end
+
+local elementPosition = function (elementName)
+    if (elementsTable[elementName] == nil) then
+        return nil
+    end
+    return elementsTable[elementName]
+end
+
+local placeElement = function (x, y, element, imagePath)
+    local screen = element.screen or TOP_SCREEN
+    -- Ensure the element is not already placed
+    if (elementPosition(element.name) ~= nil) then
+        return false, "alreadyplaced" -- Element already placed
+    end
+    -- Ensure the tiles are empty
+    for i = x + 1, x + element.width do
+        for j = y + 1, y + element.height do
+            if isElement(x, y) then
+                return false, "notempty" -- Tile is not empty
+            end
+        end
+    end
+    -- Loading the image
+    local imageObject = Screen.loadImage(System.currentDirectory() .. imagePath)
+    -- Setting the starting cell
+    Scene.environment.matrix[x][y].Element = element.name
+    Scene.environment.matrix[x][y].Type = element.type
+    Scene.environment.matrix[x][y].Collision = element.collision
+    Scene.environment.matrix[x][y].StartingPosition = {x, y}
+    Scene.environment.matrix[x][y].Size = {element.width, element.height}
+    Scene.environment.matrix[x][y].Image = imageObject
+    Scene.environment.matrix[x][y].Screen = screen
+    Scene.environment.matrix[x][y].Properties = element.properties
+    -- Filling the matrix with the element
+    for i = x + 1, x + element.width do
+        for j = y + 1, y + element.height do
+            Scene.environment.matrix[i][j] = Scene.environment.matrix[x][y]
+        end
+    end
+    -- Adding the element to the elements table
+    elementsTable[element.name] = {x, y}
+    return true, "placed"
+end
+
+local removeElement = function (elementName)
+    -- Getting the element coordinates
+    local coordinates = elementPosition(elementName)
+    -- Check if the element is in the elements table
+    if (coordinates == nil) then
+        return
+    end
+    local x = coordinates[1]
+    local y = coordinates[2]
+    -- Setting the starting cell
+    Scene.environment.matrix[x][y] = {emptyElement}
+    -- Filling the matrix with the element
+    for i = x + 1, x + element.width do
+        for j = y + 1, y + element.height do
+            Scene.environment.matrix[i][j] = Scene.environment.matrix[x][y]
+        end
+    end
+end
+
+
+local checkTileCollision = function (x, y)
+    if (Scene.environment.matrix[x][y].Collision) then
+        return true
+    else
+        return false
+    end
+end
+-- !SECTION Methods
+
+local mainLoop = function ()
+    Screen.waitVblankStart() -- Screen related stuff
+    Screen.refresh() -- Other Screen related stuff
+    Screen.clear(TOP_SCREEN) -- Clear top screen
+    Screen.clear(BOTTOM_SCREEN) -- Clear bottom screen
+    -- Keypress handling
+    keyEvents() -- Check for key events
+    -- Elements on screen
+    mainGUI()
+    Screen.flip() -- More screen related stuff
+end
+
+-- START MAIN LOGIC
+initialLoad()
+
+-- Continuously loop
+while (true) do
+    mainLoop() -- Draw to screen
+end
+
+