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| Label: corona android iphone ipad building error inmobi problem display screen View image tableView failed object physics touch button game lua config event listener | |
I have entered this for interactivity with the ball --
--Add Event Listener and allow for interactivity
function moveBall(event)
local vx = (ball.x-event.x)/100
local vy=-5.0
ball:applyLinearImpulse( vx, vy, event.x, event.y )
score = score + 1
scoreText.text = score
end
ball:addEventListener("touch", moveBall)
The score count goes up once every time I tap the ball, but when it hits the ground, how do I make it so the score automatically goes back to zero?
You probably need a Runtime:addEventListener to listen for collisions with the ground and use an if statement inside another function to test for event.other then if it's equal (==) to your variable ground then set the score to zero again. Your'll probably need to set a global score up too.
can you type in a code of what that'd look like? i tried a few but im still new to this
Heres what your main.lua file should roughly look like, if you pop in two graphics for your ball and the ground then the following should give you a good starting point for creating what you were looking for:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | local physics = require("physics") physics.start() physics.setGravity(0, 9.8) -- set up the physics stuff score = 10 -- a global score up, i've set it to 10 to test local ball -- ball local ground -- the ground local scoreText -- the score scoreText = display.newText(score, 100, 10, Helvetica, 50) -- sets up the basic score ball = display.newImage( "ball.png", 50, 0 ) -- ball image physics.addBody(ball, "dynamic", {density = 1.0, friction = 0.3, bounce = 0.2}) -- add physics to the ball so it moves ground = display.newImage( "ground.png", 0, 300 ) -- ground image physics.addBody(ground, "static", {density = 1.0, friction = 0.3, bounce = 0.2}) -- set the ground to static but have some bounce and friction ball.name = "ball" -- create a name for the ball object ground.name = "ground" -- create a name for the ground so we can compare function moveBall(event) -- your original function local vx = (ball.x-event.x)/100 local vy=-5.0 ball:applyLinearImpulse( vx, vy, event.x, event.y ) score = score + 1 scoreText.text = score end ball:addEventListener("touch", moveBall) function onCollision( self, event ) -- function to test for hitting the ground if self.name == "ground" and event.other.name =="ball" then -- if the ball hits the ground then score = 0 -- score = 0 scoreText.text = score -- set the score text end end ground.collision = onCollision -- call function onCollision ground:addEventListener( "collision", ground) -- add event listener to the ground |
it worked ! thank you! any idea what a realistic friction is?
Hi,
thanks for the great tutorial. i need the code to add a score when the ball falls down to ground , and once a collision is made to remove the object from the screen.
I was playing with the code to add multiple dropped items with a timer, but im unable to get scoring
when using multiple items.
here is the modified code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | local physics = require("physics") physics.start() physics.setGravity(0, 9.8) -- set up the physics stuff score = 100 -- a global score up, i've set it to 100 to test local ground -- the ground local scoreText -- the score scoreText = display.newText(score, 100, 10, Helvetica, 50) -- sets up the basic score ground = display.newImage( "assets/graphics/ground.png", 0, 400 ) -- ground image physics.addBody(ground, "static", {density = 1.0, friction = 0.3, bounce = 0.2}) -- set the ground to static but have some bounce and friction function dropBalls() rand = math.random(100) if (rand < 65) then j = display.newImage("assets/graphics/ball.png"); j.x = 60 + math.random( 45, 160 ) j.y = -100 physics.addBody( j, { density=0.9, friction=0.3, bounce=0.2} ) elseif (rand < 80) then j = display.newImage("assets/graphics/ball2.png") j.x = 60 + math.random( 45, 160 ) j.y = -100 physics.addBody( j, { density=1.4, friction=0.3, bounce=0.5} ) end end -- this controls amount of crates drop and the time between (in Milliseconds. 1000 Milliseconds = 1 Sec local dropBalls = timer.performWithDelay( 1500, dropBalls, 22 ) dropBalls.name = "dropBalls()" -- create a name for the ball object ground.name = "ground" -- create a name for the ground so we can compare function moveBall(event) -- your original function local vx = (dropBalls().x-event.x)/100 local vy=-5.0 dropBalls():applyLinearImpulse( vx, vy, event.x, event.y ) score = score + 10 scoreText.text = score end dropBalls():addEventListener("touch", moveBall) function onCollision( self, event ) -- function to test for hitting the ground if self.name == "ground" and event.other.name =="dropBalls()" then -- if the ball hits the ground then score = score - 5 -- score - 5 scoreText.text = score -- set the score text end end ground.collision = onCollision -- call function onCollision ground:addEventListener( "collision", ground) -- add event listener to the ground |
views:1325 update：2011/10/5 21:23:48