Spawning multiple images

Getting Started Newbie Questions
#1

Hi

The below code loops ten times from the gametimer but only one image is displayed, or appears to be. What is wrong with my code?

Thanks

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

local centerX = display.contentCenterX;
local centerY = display.contentCenterY;
local ball1
_W = display.contentWidth
_H = display.contentHeight

local physics = require(“physics”)
physics.start( )
physics.setGravity( xGravity, yGravity)

local function startgame()

 ball1.x =  math.random(display.contentWidth)
 ball1.y = display.contentHeight-4 --tried different number here
 physics.addBody(ball1, {bounce = 0.6, friction =0.1, radius=45})
 ball1:setLinearVelocity(900,1500)
 end

function scene:createScene( event )
 local group = self.view
    local group = scene.view;

  local bg = display.newImageRect(group, “IMG/bgBlack.png”, totalWidth, totalHeight);
  bg.x, bg.y = centerX, centerY;
 

local left_wall = display.newRect(0,0,2,_H*2)
physics.addBody(left_wall,“static”, {bounce = 0.5, friction=0.5,filter = boarderCollsionFilter})
left_wall.myName = “Left Wall”

local right_wall = display.newRect(_W-1,0,2,_H*2)
physics.addBody(right_wall,“static”, {bounce = 0.5, friction=0.5,filter = boarderCollsionFilter})
right_wall.myName = “Right Wall”

local top_wall = display.newRect(0,0,_W*2,2)
physics.addBody(top_wall,“static”, {bounce = 0.5, friction=0.5,filter = boarderCollsionFilter})
top_wall.myName = “Top Wall”

local bottom_wall = display.newRect(0,_H,_W*2,2)
physics.addBody(bottom_wall,“static”, {bounce = 1, friction=0.5,filter = boarderCollsionFilter})
bottom_wall.myName = “Bottom Wall”

 
  gametimer = timer.performWithDelay( 20, startgame, 10)
  end
 
 

 – Called immediately after scene has moved onscreen:
function scene:enterScene( event )
local group = self.view
 ball1 = display.newImage(group, “IMG/image1.png”,10)

end
 

#2

where is your code in spawning new objects? is it in the startgame function?

#3

yes it is called from this timer gametimer = timer.performWithDelay( 20, startgame, 10)

#4

you dont seem to be actually spawning any balls, just replacing the position of ball 1. Also its much more effecient to use a for loop instead of timer.performWithDelay for short periods of time, e.g

local ball = {} local random = math.random local \_W = display.viewableContentWidth local \_H = display.viewableContentHeight local physics = require("physics") physics.start( ) physics.setGravity( 0,0) for i = 1, 10 do     ball[i] = display.newImage(group, "IMG/image1.png",10)     ball[i].x = random(\_W)     ball[i].y = \_H \* .5     physics.addBody( ball[i] , {bounce = 0.6, friction =0.1, radius=45})      ball[i]:setLinearVelocity(900,1500)  end  
#5

Much cleaner thank you

#6

where is your code in spawning new objects? is it in the startgame function?

#7

yes it is called from this timer gametimer = timer.performWithDelay( 20, startgame, 10)

#8

you dont seem to be actually spawning any balls, just replacing the position of ball 1. Also its much more effecient to use a for loop instead of timer.performWithDelay for short periods of time, e.g

local ball = {} local random = math.random local \_W = display.viewableContentWidth local \_H = display.viewableContentHeight local physics = require("physics") physics.start( ) physics.setGravity( 0,0) for i = 1, 10 do     ball[i] = display.newImage(group, "IMG/image1.png",10)     ball[i].x = random(\_W)     ball[i].y = \_H \* .5     physics.addBody( ball[i] , {bounce = 0.6, friction =0.1, radius=45})      ball[i]:setLinearVelocity(900,1500)  end  
#9

Much cleaner thank you