Adding player class instance into sceneGroup (to draw on-screen)

Solar2D General Questions/Discussion
#1

Hi,

I’m struggling a lot here and desperately hoping I’m not just being a total fool.

I have a character class that I have created using 30logglobal, I can’t for some reason figure out how to draw it in the game.lua sceneGroup using the insert command.

character.lua

local Character = class()
Character.__name = “Character”

function Character:__init( name )
    self.name = name
   
    self = display.newImageRect( “Content/hero.png”, 0, 15, 50, 50 )
    self.rotation = 90
    self.anchorX, self.anchorY = 0.5, 0.6
    self.direction =  “right”
end

return Character

player.lua

local Character = require( “Character” )

local Player = Character:extends()
Player.__name = “Player”

function Player:__init( name )
    Player.super.__init( self, name )    

return Player

game.lua

local composer = require( “composer” )
local scene = composer.newScene()

local Player = require( “player” )

local player = Player:new( “playerOne” )

local widget = require “widget”

local screenW, screenH, halfW = display.actualContentWidth, display.actualContentHeight, display.contentCenterX

function scene:create( event )

    local sceneGroup = self.view

    local background = display.newImageRect( “Content/levelOneMap.png”, display.actualContentWidth, display.actualContentHeight )
    background.anchorX = 0
    background.anchorY = 0
    background.x = 0 + display.screenOriginX
    background.y = 0 + display.screenOriginY

    sceneGroup:insert( background )
    sceneGroup:insert( player )
end

function scene:show( event )
    local sceneGroup = self.view
    local phase = event.phase
    
    if phase == “will” then
       
    elseif phase == “did” then

    end
end

function scene:hide( event )
    local sceneGroup = self.view
    
    local phase = event.phase
    
    if event.phase == “will” then

    elseif phase == “did” then

    end    
    
end

function scene:destroy( event )

    local sceneGroup = self.view

end

scene:addEventListener( “create”, scene )
scene:addEventListener( “show”, scene )
scene:addEventListener( “hide”, scene )
scene:addEventListener( “destroy”, scene )

return scene

Many thanks in advance for any help that can be offered!

Alex

#2

Over complication of code… try this

function scene:create( event ) local sceneGroup = self.view local background = display.newImageRect(sceneGroup, "Content/levelOneMap.png", display.actualContentWidth, display.actualContentHeight ) background.x, background.y = display.actualContentWidth/2, display.actualContentHeight/2 --create new player local player = display.newImageRect(sceneGroup, "Content/hero.png", 0, 15, 50, 50 ) player.rotation = 90 end
#3

Hi adrianm,

Thank you for your advice, this actually helped me by stepping back. I do however want entirely separated entities that are self-contained within their classes. After taking your approach though, I re-entered the code into the class and found the solution in doing this:

character.lua

   self.image = display.newImage( “Content/hero.png”, 0, 15, 50, 50 )

game.lua

local player = Player:new( self, “playerOne” )

    sceneGroup:insert( player.image )

It seems so obvious now but I realise that when I tried this same thing previously, I hadn’t added ‘self’ when initialising the ‘player’ in the game.lua file.

I’m getting there now, I just need to figure out how to apply the rotation and anchors using this approach.

Thanks again for your help!

#4

Great glad it helped…

Personally, I would advise player.lua to return a display group on it’s new() like this.  You shouldn’t need to pass a reference of self as that is passed by default.

local aNewPlayer = Player:new( "playerOne" ) sceneGroup:insert( aNewPlayer )

This way you are free to modify and extend the display capabilities of the player in the future without making any code changes to game.lua

#5

Over complication of code… try this

function scene:create( event ) local sceneGroup = self.view local background = display.newImageRect(sceneGroup, "Content/levelOneMap.png", display.actualContentWidth, display.actualContentHeight ) background.x, background.y = display.actualContentWidth/2, display.actualContentHeight/2 --create new player local player = display.newImageRect(sceneGroup, "Content/hero.png", 0, 15, 50, 50 ) player.rotation = 90 end
#6

Hi adrianm,

Thank you for your advice, this actually helped me by stepping back. I do however want entirely separated entities that are self-contained within their classes. After taking your approach though, I re-entered the code into the class and found the solution in doing this:

character.lua

   self.image = display.newImage( “Content/hero.png”, 0, 15, 50, 50 )

game.lua

local player = Player:new( self, “playerOne” )

    sceneGroup:insert( player.image )

It seems so obvious now but I realise that when I tried this same thing previously, I hadn’t added ‘self’ when initialising the ‘player’ in the game.lua file.

I’m getting there now, I just need to figure out how to apply the rotation and anchors using this approach.

Thanks again for your help!

#7

Great glad it helped…

Personally, I would advise player.lua to return a display group on it’s new() like this.  You shouldn’t need to pass a reference of self as that is passed by default.

local aNewPlayer = Player:new( "playerOne" ) sceneGroup:insert( aNewPlayer )

This way you are free to modify and extend the display capabilities of the player in the future without making any code changes to game.lua