My messy game.lua code as it stands.
[lua]module(…, package.seeall)
function new()
–local group for Director
local localGroup = display.newGroup()
local physics = require (“physics”)
– Start physics engine and set options
physics.setGravity( 0 , 0 )
–physics.setDrawMode( “hybrid” )
physics.start()
– Setup Display Groups
local bkgdGroup = display.newGroup()
local frgdGroup = display.newGroup()
local scoreGroup = display.newGroup()
– Setup background image
local bkgd = display.newImage (“background.png”)
– Setup foreground images
local station = display.newImage(“station.png”)
local pausebtn = display.newImage(“pause.png”)
– Display Group For Background Images
bkgdGroup:insert(bkgd)
bkgdGroup:setReferencePoint(display.CenterReferencePoint)
bkgdGroup.x = _W / 2; bkgdGroup.y = _H / 2;
– Displayground for foreground images
frgdGroup:insert(station)
station.x = _W / 2; station.y = _H - 100;
frgdGroup:insert(pausebtn)
pausebtn:setReferencePoint(display.BottomRightReferencePoint)
pausebtn.x = _W - 30; pausebtn.y = _H - 25; pausebtn.alpha = 0.5;
– Setup Scoreboard
local scoreBoard = display.newRect(0, 0, 200, 40)
– Preset Settings for disaply objects
scoreBoard:setFillColor(255, 255, 200, 70)
local myScoreText = display.newText(“0”, 0, 0, native.systemFont, 30)
myScoreText:setTextColor(255, 255, 255)
myScoreText:setReferencePoint(display.TopLeftReferencePoint)
myScoreText.x = 165; myScoreText.y = 4;
– Display Group for ScoreBoard
scoreGroup:insert(scoreBoard)
scoreGroup:insert(myScoreText)
scoreGroup:setReferencePoint(display.BottomLeftReferencePoint)
scoreGroup.x = 30; scoreGroup.y = _H - 25;
–Setup shield around station
shield = display.newImage(“shield_1.png”)
shield.myName = “shield”
frgdGroup:insert(shield)
shield.x = _W / 2 - 6; shield.y = _H - 100;
physics.addBody(shield, “static”, {density=1, friction=0, bounce=0, radius=78})
– Shoot listener function
function shootListener ()
function addShootListener()
bkgd:addEventListener (“tap”, shoot)
physics.start()
end
timer.performWithDelay( 300, addShootListener,1 )
end
– pause screen popup
local function pauseScreen( event )
if event.phase == “ended” then
bkgd:removeEventListener (“tap”, shoot)
physics.pause()
director:openPopUp( “pause”, shootListener)
end
end
– Update the score on the scoreboard
local function updateScore( event )
_MyScore = _myScore + 10
myScoreText.text = _MyScore
end
– Update shot data
local function updateShots ()
_ShotsFired = _ShotsFired + 1
end
– Update number of objects destroyed
local function updateDestroyed ()
_NumDestroyed = _NumDestroyed + 1
– End the game if the destroyed targets meets criteria
if _NumDestroyed == _ToDestroy then
endGame()
end
end
– When game ends, display game over graphis
– Show score, shots fired and number of object destroyed… dig i mention chicks dig it?
local function endGame ()
– Clean Up
bkgd:removeEventListener (“tap”, shoot)
cancelAllTransitions()
physics.stop()
– Display gameover dialogue
director:changeScene(“gameover”)
end
– Missile explosion at end of transition
local function msExplosion(x,y)
local explosion = display.newCircle(0,0,5)
frgdGroup:insert(explosion)
explosion.x = x; explosion.y = y; explosion.alpha=0.6;
explosion:setFillColor ( 255, 240, 0 )
local rand = math.random(15,25)
transitionStash.newTransition=transition.to(explosion, {time=1500, xScale=rand, yScale=rand, onComplete=function()explosion:removeSelf();updateDestroyed();end})
end
– Launch objects towards station from
– random locations across the top of the screen
local function deployAsteroid ()
local asteroid = display.newImage(“asteroid.png”)
asteroid.myName = “asteroid”
frgdGroup:insert(asteroid)
asteroid:setReferencePoint(display.CenterReferencePoint)
asteroid.x = math.random(-30, 1054); asteroid.y = -20;
asteroid.xScale = 0.75; asteroid.yScale = 0.75;
physics.addBody(asteroid, {density=1, friction=0, bounce=0, radius=47})
transitionStash.newTransition=transition.to(asteroid, {time=6000, x = _W / 2, y = _H-100, rotation= 180, onComplete=function()asteroid:removeSelf();end})
end
– Shoot the missile
function shoot ( event )
if event.y < (_H - 125) then
– update how many shots to have fired
updateShots()
– Initialize missile.png on screen
local smMissile = display.newImage(“smMissile.png”)
smMissile.myName = “missile”
frgdGroup:insert(smMissile)
– Maths… I hate it
radians = math.atan2(event.y-station.y,event.x-station.x)
degrees = ((radians/math.pi)*180)+90
– Maths… Rotate it
smMissile.rotation = degrees
– Missile launch location (on space station)
smMissile.x = display.contentCenterX
smMissile.y = 690
– Move missle from station to touch event… Vrooooom!
transitionStash.newTransition = transition.to(smMissile, {x=event.x, y=event.y, transition=easing.inQuad, onComplete=function() smMissile:removeSelf(); msExplosion(event.x,event.y); end})
end
end
local function depleteShield()
local function killShield()
shield = display.newImage(“shield_2.png”)
shield.myName = “shield”
frgdGroup:insert(shield)
shield.x = _W / 2 - 6; shield.y = _H - 100;
physics.addBody(shield, “static”, {density=1, friction=0, bounce=0, radius=78})
end
transitionStash.newTransition = transition.to(shield, {time=300, alpha = 0, onComplete= function() display.remove(shield); end})
timer.performWithDelay(300,killShield)
end
local function onCollision(e)
– Detect if the collision is from the asteroid hitting the station or a missile explosion
if (e.object2.myName == “asteroid”) and (e.phase == “began”) then
if _ShieldNo <= 5 then
_ShieldNo = 2
print(“Hit Detected”)
depleteShield()
–Insert code to remove asteroid here–
else
gameOver()
end
else if (e.object2.myName == “missile”) and (e.phase == “began”) then
msExplosion()
end
end
end
local function launchGame()
– check level number and increase items
– to be destroyed as game progresses
if _MyLevel == 1 then
_MyScore = 0
_ShotsFired = 0
_NumDestroyed = 0
_ToDestroy = 5
else
_ToDestroy = _toDestroy + math.random(5,8)
end
–Display what level you are onat start of game
local levelText = display.newText(("Level "… _MyLevel),0,0, “Bauhaus 93”, 140)
frgdGroup:insert(levelText)
levelText:setTextColor(255,255,255)
levelText.x = _W / 2
levelText.y = _H / 2
transitionStash.newTransition = transition.to(levelText, {time=1000, delay=1000, alpha=0, onComplete=shootListener})
local rnumb = math.random(2000,3500)
– insert code to deploy asteroids until _ToDestroy number has been met –
timer.performWithDelay(rnumb, deployAsteroid)
end
–Launch the game
launchGame()
–Pause Event Listeners
pausebtn:addEventListener(“touch”, pauseScreen)
Runtime:addEventListener(“collision”, onCollision)
localGroup:insert(bkgdGroup)
localGroup:insert(frgdGroup)
localGroup:insert(scoreGroup)
return localGroup
end[/lua] [import]uid: 83851 topic_id: 13987 reply_id: 53006[/import]
I’ve been through a few tutorials from Peach which has helped me get to where I am but Im having troubles with some math. I have an image of a missile that shoots out from a space station from the centre bottom of the screen. Im using a transition.to to move the image from teh station to the “tap” event which works fine and dandy but the problem I am having is working out the angle to rotate the image so the missile points towards where its going. I’ve restricted the game to iPad res only (1024,768) and in landscape (home button to the left). Below is the code i have so far… doing each little bit and as i learn to do something better, replace the code out. I have a basic scoreboard happening too… it increases when I click on the station for now.