Thats the weird thing, the laser/asteroid collision is working perfectly as is the asteroid/asteroid collisions. Shooting an asteroid with the laser increments my score and both the objects disappear.
I’m going to copy/paste my entire code below if that helps
[lua]
–
– main.lua
–
– Title: Star Explorer - a space shooter game.
– Description: Maneuver your starship through an asteroid field, destroying
– asteroids as you progress.
– Controls: Tap on ship to fire. Drag to move left/right.
– Sounds: Shooting/explosion sounds.
– Source: https://docs.coronalabs.com/guide/programming/02/index.html
– Include physics (space so gravity = (0, 0))
local physics = require(“physics”)
physics.start()
physics.setGravity( 0, 0 )
– Seed the random number generator
math.randomseed(os.time())
– Load the image sheets
local sheetOptions =
{
frames =
{
{ --1 Asteroid 1
x = 0,
y = 0,
width = 102,
height = 85
},
{ --2 Asteroid 2
x = 0,
y = 85,
width = 90,
height = 83
},
{ --3 Asteroid 3
x = 0,
y = 168,
width = 100,
height = 97
},
{ --4 Ship
x = 0,
y = 265,
width = 98,
height = 79
},
{ --5 Laser
x = 98,
y = 265,
width = 14,
height = 40
},
}
}
local objectSheet = graphics.newImageSheet( “gameObjects.png”, sheetOptions )
– Initialize variables
local lives = 3
local score = 0
local died = false
– Empty table initialized
local asteroidsTable = {}
local ship
local gameLoopTimer
local livesText
local scoreText
– Set up display groups
local backGroup = display.newGroup() – Display group for background image
local mainGroup = display.newGroup() – Display group for the main images (ships, asteroids)
local uiGroup = display.newGroup() – Display group for the user interface
– Load the background
local background = display.newImageRect( backGroup, “background.png”, 800, 1400 )
background.x = display.contentCenterX
background.y = display.contentCenterY
– Load the ship
ship = display.newImageRect( mainGroup, objectSheet, 4, 98, 79 )
ship.x = display.contentCenterX
ship.y = display.contentHeight-100
physics.addBody(ship, {radius=30, isSensor=true})
ship.myName = “ship”
– Load the UI
livesText = display.newText(uiGroup, "Lives: " … lives, 200, 80, native.systemFont, 36)
scoreText = display.newText( uiGroup, "Score: " … score, 400, 80, native.systemFont, 36 )
– Hide the status bar
display.setStatusBar( display.HiddenStatusBar )
– Function to update text
local function updateText()
livesText.text = "Lives: " … lives
scoreText.text = "Score: " … score
end
– Function to create asteroids
local function createAsteroid()
local newAsteroid = display.newImageRect(mainGroup, objectSheet, 1, 102, 85)
– To keep track of the asteroids insert into a table
table.insert(asteroidsTable, newAsteroid)
physics.addBody( newAsteroid, “dynamic”, {radius=40, bounce=0.8} )
newAsteroid.myName = “asteroid”
– where to create the asteroid logic
local whereFrom = math.random(3)
if (whereFrom == 1) then
– From the left and anywhere between y = 0->500
newAsteroid.x = -60
newAsteroid.y = math.random(500)
newAsteroid:setLinearVelocity(math.random(40, 120), math.random(20, 60))
elseif (whereFrom == 2) then
newAsteroid.x = math.random(display.contentWidth)
newAsteroid.y = -60
newAsteroid:setLinearVelocity(math.random(-40, 40), math.random(40, 120))
elseif (whereFrom == 3) then
newAsteroid.x = display.contentWidth + 60
newAsteroid.y = math.random(500)
newAsteroid:setLinearVelocity(math.random(-120, -40), math.random(20, 60))
end
– Add torque to the asteroid image
newAsteroid:applyTorque(math.random(-6,6))
end
– Function to shoot lasers
local function fireLaser()
local newLaser = display.newImageRect( mainGroup, objectSheet, 5, 14, 40 )
physics.addBody( newLaser, “dynamic”, { isSensor=true} )
newLaser.isBullet = true
newLaser.myName = “laser”
newLaser.x = ship.x
newLaser.y = ship.y
newLaser:toBack()
transition.to(newLaser, {y = -40, time=500,
onComplete = function() display.remove(newLaser) end
})
end
– Add event to shoot laser
ship:addEventListener(“tap”, fireLaser)
– Function to move the ship
local function dragShip(event)
– ship var is the thing that was ‘touched’
local ship = event.target
– phase var for the 4 phases of the touch event “began”, “moved”, “ended”, “cancelled”
local phase = event.phase
if (“began” == phase) then
– Set touch focus on the ship
display.currentStage:setFocus(ship)
– Store initial offset position
ship.touchOffsetX = event.x - ship.x
elseif (“moved” == phase) then
– Move the ship to the new touch position
– Using the offset value produces a smooth dragging effect
--if (ship.x < display.contentWidth-50 and ship.x > 50) then
ship.x = event.x - ship.touchOffsetX
--end
elseif (“ended” == phase or “cancelled” == phase) then
– Release touch focus from ship
display.currentStage:setFocus(nil)
end
return true – Prevents touch propagation to underlying objects
end
– Add event to drag ship
ship:addEventListener(“touch”, dragShip)
– Game loop function
local function gameLoop()
– Create new asteroid
createAsteroid()
– Remove asteroids that have drifted off the screen
for i = #asteroidsTable, 1, -1 do
local thisAsteroid = asteroidsTable[i]
if ( thisAsteroid.x < -100 or
thisAsteroid.x > display.contentWidth + 100 or
thisAsteroid.y < -100 or
thisAsteroid.y > display.contentHeight + 100)
then
display.remove(thisAsteroid)
table.remove(asteroidsTable, i)
end
end
end
gameLoopTimer = timer.performWithDelay( 500, gameLoop, 0 )
– Function to restore ship after death
local function restoreShip()
– set body active to false so it does not interact with asteroids on fade-in
ship.isBodyActive = false
– Position and set the velocity of the ship
ship:setLinearVelocity(0, 0)
ship.x = display.contentCenterX
ship.y = display.contentHeight-100
– Fade in the ship
– Alpha 0->1, 4000ms, onComplete turn body active, set died to false
transition.to(ship, {alpha=1, time=4000,
onComplete = function()
ship.isBodayActive = true
died = false
print(“set died to false”)
end
})
end
local function onCollision( event )
print(“onCollision called”)
if (event.phase == “began”) then
local obj1 = event.object1
local obj2 = event.object2
– Handle the laser / asteroid collision
if ( (obj1.myName == “laser” and obj2.myName == “asteroid”) or
(obj1.myName == “asteroid” and obj2.myName == “laser”) )
then
– Remove both the laser and asteroid
display.remove(obj1)
display.remove(obj2)
for i = #asteroidsTable, 1, -1 do
if (asteroidsTable[i] == obj1 or asteroidsTable[i] == obj2) then
table.remove(asteroidsTable, i)
break
end
end
– Increase score
score = score + 100
scoreText.text = "Score: " … score
– Handle the ship / asteroid collision
elseif ( (obj1.myName == “ship” and obj2.myName == “asteroid”) or
(obj1.myName == “asteroid” and obj2.myName == “ship”) )
then
print(“inside death loop”)
if (died == false) then
died = true
– Update lives
lives = lives - 1
livesText.text = "Lives: " … lives
if (lives == 0) then
display.remove(ship)
else
ship.alpha = 0
timer.performWithDelay( 1000, restoreShip )
end
end
end
end
end
Runtime:addEventListener(“collision”, onCollision)
[/lua]
