Collision with coins not working

Solar2D General Questions/Discussion
#1

I’m making an app where I spawn coins and add horizontal gravity to them. I was having problems with my previous code that, whenever the coins collided, whether with the player or the enemy, it added a point to the score. I tried to fix it, but now that coins just bounce when they hit the player (or the enemy)
How can I make that the coins disappear (and add 1 point) only if they hit the player?

[code]
local player
local enemy

–Function to spawn a coin
local function spawn(params)
local coin = display.newImage(params.image)
setPos(coin, W + 10, math.random(10, H - 10))
–Set the coin table to a table passed in by parameters
coin.objTable = params.objTable
–Automatically set the table index to be inserted into the next available table index
coin.index = #coin.objTable + 1

–Give the coin a custom name
coin.myName = "coin : " … coin.index
–If the coin should have a body create it, else dont.
if params.hasBody then
–Allow physics parameters to be passed by parameters:
coin.density = params.density or 0
coin.friction = params.friction or 0
coin.bounce = params.bounce or 0
coin.isSensor = params.isSensor or false
coin.bodyType = params.bodyType or “dynamic”

physics.addBody(coin, coin.bodyType, {density = coin.density, friction = coin.friction, bounce = coin.bounce, isSensor = coin.isSensor})
end

–The coins group
coin.group = params.group or nil

–If the function call has a parameter named group then insert it into the specified group
coin.group:insert(coin)

–Insert the coin into the table at the specified index
coin.objTable[coin.index] = coin

function onCollision(e)

local function updateScore()
textScore.text = "Score: " … score
end

local function addScore()
score = score + 1
end

if e.phase == “began” then
if e.other.myName == ‘player’ then
coin:removeSelf()
coin = nil
addScore()
updateScore()
end
end
end
coin:addEventListener(“collision”, onCollision)

return coin
end

local localGroup = display.newGroup()

local spawnTable = {}

function spawnCoin()
local spawns = spawn(
{
image = “src/coin.png”,
objTable = spawnTable,
hasBody = true,
bodyType = “dynamic”,
group = localGroup,
}
)
end

coinTimer = timer.performWithDelay(1000, spawnCoin, 0)
[/code] [import]uid: 154404 topic_id: 32634 reply_id: 332634[/import]

#2

Take a look at Corona For Newbies part 4 on Techority - you need to assign a name to the coins to do proper collision detection so you know what collides with what. Then your initial code would work to not remove them when they collided with the bombs.

Also, you should be spawning them in a table. There’s a great post by Jon Beebe on tables worth checking out for this, or the for loop tutorial on Techority if you want something shorter/a little more newbie friendly.

Peach :slight_smile: [import]uid: 52491 topic_id: 32634 reply_id: 129961[/import]

#3

Take a look at Corona For Newbies part 4 on Techority - you need to assign a name to the coins to do proper collision detection so you know what collides with what. Then your initial code would work to not remove them when they collided with the bombs.

Also, you should be spawning them in a table. There’s a great post by Jon Beebe on tables worth checking out for this, or the for loop tutorial on Techority if you want something shorter/a little more newbie friendly.

Peach :slight_smile: [import]uid: 52491 topic_id: 32634 reply_id: 129961[/import]

#4

Thanks Peach, you always give the best and clearest comments. :slight_smile: [import]uid: 154404 topic_id: 32634 reply_id: 130159[/import]

#5

Thanks Peach, you always give the best and clearest comments. :slight_smile: [import]uid: 154404 topic_id: 32634 reply_id: 130159[/import]

#6

No worries, after you have given that a go let me know how you get on. [import]uid: 52491 topic_id: 32634 reply_id: 130192[/import]

#7

No worries, after you have given that a go let me know how you get on. [import]uid: 52491 topic_id: 32634 reply_id: 130192[/import]