Objects that display current lives dissapears after returning to scene

Getting Started Newbie Questions
#1

I am working on a game that shows the amount of lives the player has on the top left corner. The problem is: if the player dies and wants to play again, the lives are not shown. The lives were created in scene:create and I knew that this would only show once. So, I tried moving it to scene:show(phase == “will”), but now, the player does not appear to lose lives, and they show on different scenes.

This is how they are created and removed: 

Two forward declares:

local lives = {} -- table that will hold the lives object local livesCount = 4

For loop:

for i=1, livesCount do lives[i] = display.newImageRect("heart.png", 50, 50) lives[i].x = \_L + (i \* 65) - 25 lives[i].y = \_T + 50 end

Player Gets Hit:

local function playerHit() composer.gotoScene("level1-Try-Again") lives[livesCount].alpha = 0 livesCount = livesCount - 1 if(livesCount \< 1) then onGameOver() end end

May someone please help me in resolving this matter so I may move forward with my game. Thank you.

Sincerely,

Alex

#2

When adding objects to a scene, don’t forget to insert them into a scene group, that is self.view or scene.view

display.newImageRect(self.view, "heart.png", 50, 50)

That way when you leave the scene, they will disappear automatically.

You can create these images in scene:create(), but do reset them on scene:show() with a “will” phase. That is set alpha = 0 to each of them and immediately after that set alpha = 1 to the correct amount of them (livesCount).

#3

In the will phase, should I use a timer.performWithDelay to set them back to alpha = 1?

#4

For example:

local function resetLives()

      lives.alpha = 1

end

lives.alpha = 0

timer.performWithDelay(50, resetLives, 1)

#5

No, you don’t need a timer for that action.

#6

They are not showing when the code is run.

#7 
lives.alpha = 0 lives.alpha = 1

This is what I did.

#8

Do I have to insert them to the scene group through sceneGroup:insert?

#9

lives is an array, not a group. To change their alpha, iterate over the array and assign alpha to each of them individually. 

#10

The exact same thing occurred.

for i=1, livesCount do lives[i].alpha = 0 lives[i].alpha = 1 end
#11 
for i=1, #lives do lives[i].alpha = 0 end for i=1, livesCount do lives[i].alpha = 1 end

I meant this.

#12

It still does not work, I used your exact code and then I tried this:

for i=1, livesCount do lives[i].alpha = 0 end for i=1, livesCount do lives[i].alpha = 1 end
#13

Do you have some background images that can overlap the lives, e.g. are you reinserting anything on scene:show()

Right now it’s guessing, you can upload your code somewhere and we can see.

#14

Can I send you a private message containing all my code through the corona messenger?

#15

Do you have any screen sharing software or program?

#16

You can, but it’s better to upload it to say github. That way it’s easier to see the code and help you.

#17

I have never uploaded code to github, it will take me a while, could you kindly wait for me, please? Once I post on github, I will send you the link, thank you so much.

#18

Sure. Working with github and source versioning in general is a must have skill anyway.

#19

https://gist.github.com/sdktester15/a113811289e1c322fb5c3c3fd6e811ae

This is the link that should direct you to my level1.lua code.

#20

Also, I have another question, how can I create a scoring system that gives the user 10 points every time they jump over an object?