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Getting Started Newbie Questions
#1

Hi Ansca,

I am programming a word game, but with some physics twists. So whenever you find the word bed, it spawns a bed. A cannon also shoots balls out of it. So I wanted the ball to disappear once it collided with the bed. So I put this code in:

[lua]

local function cat()

local flame = display.newImage(“flame.gif”, 422, 68);

transition.to(flame, {time=500, alpha=0});

local ball = display.newImage(“meteor.png”, 430, 65)

ball.yScale = 0.5;

ball.xScale = 0.5;

ball.myName = “ball”;

physics.addBody(ball, “static”, {density=0.4, friction=0.5, bounce=0.1, radius=15});

–ball.collision = coll;

–ball:addEventListener(“collision”, ball);

–lett:insert(ball);

local function fall()

local function falla()

transition.to(ball, {x=ball.x-215, y=ball.y+50, time=900});

end

transition.to(ball, {x=ball.x-50, time=250, onComplete=falla});

end

transition.to(ball, {x=ball.x-215, y=ball.y-50, time=900, onComplete=fall});

–physics.setGravity(-7, -5);

–timer.performWithDelay(650, gchange, 1);

end

 

timer.performWithDelay( math.random(7000, 12000), cat, 0);

local function onLocalCollision( self, event )

        if ( self.myName == “bed” ) and (event.other.myName == “ball”) then

        ball:removeSelf();

        end

end

[/lua]

 

 

 

#2

As you can see, it spawns the ball, and the bed is already spawned. So I did: ball:removeSelf();

And it said in the error section that ball was not defined. Why is it telling me ball is a nil value? I definitely spawned it.

Thanks in advance

#3

Ball is local to the function cat, declare it outside the function, and you should be fine.

I think there is a blog post about scope, search for it, i think you would like it.

Cheers,

Tommy

#4

Or, just reference the ball inside the collision function from the event record.

So instead of ball:removeSelf() you’d do event.other:removeSelf().

Jay

#5

Thanks so much!

event.other:removeSelf() worked! Very excited. Almost done with it!

#6

Thanks so much! event.other:removeSelf() worked! Thx so much for your help. Don’t know what I’d do without the community.

#7

Thanks, it worked!

#8

As you can see, it spawns the ball, and the bed is already spawned. So I did: ball:removeSelf();

And it said in the error section that ball was not defined. Why is it telling me ball is a nil value? I definitely spawned it.

Thanks in advance

#9

Ball is local to the function cat, declare it outside the function, and you should be fine.

I think there is a blog post about scope, search for it, i think you would like it.

Cheers,

Tommy

#10

Or, just reference the ball inside the collision function from the event record.

So instead of ball:removeSelf() you’d do event.other:removeSelf().

Jay

#11

Thanks so much!

event.other:removeSelf() worked! Very excited. Almost done with it!

#12

Thanks so much! event.other:removeSelf() worked! Thx so much for your help. Don’t know what I’d do without the community.

#13

Thanks, it worked!