app physics not working

Getting Started Newbie Questions
#1

when I run the program, the ship object always goes up instead of down. adding physics.setGravity doesn’t help. can I have some help?

here is the code (not permitted to upload sublime text file):

local physics1 = require(“physics”)
physics.start()
physics.setGravity( 0, 9.8 )

local ground = display.newImage(“ground.png”)
ground.x = display.contentWidth/2
ground.y = 340

physics.addBody(ground, {friction = .5})
ground.bodyType = “static”

local ship = display.newImage(“Space_Ship_Furniture.png”)
ship.x = display.contentWidth/2
ship.y = 340
ship.xScale = .06
ship.yScale = .06
 

physics.addBody( ship, { density = 2.0, friction = 0.5, bounce = 0.3 } )

#2

Try making your ship object heavier.
I don’t use gravity in my game, but I do set my object’s density to 10000 so they don’t move around when they hit other objects.
Probably a bit extreme for your case, but nevertheless try increasing the density.

-Saer

#3

update: I got it to fall down, except now it doesn’t bounce off the ground object. help?

#4

Increase the ‘bounce’ value.

#5

it goes straight through the ground, so the increasing the bounce didn’t help either.

#6

Try this: physics.addBody( ship, “dynamic”, { density = 2.0, friction = 0.5, bounce = 0.3 } )

#7

doesn’t work

#8

Well it should. Try adding the ground’s bodyType in-line rather than post.
physics.addBody(ground, “static”, {friction = .5})

And again, try playing with the ship’s physics values.

#9

now it is flying up again

#10

What is the density of the ship object?

#11

You must have code else where that is causing this to happen.
This code works perfectly fine:
[lua]
local physics = require (“physics”)
physics.start()
physics.setGravity( 0, 9.8 )

local ground = display.newRect(0, 0, 1024,10)
ground.y = display.contentHeight/2
physics.addBody(ground, “static”, {friction = .5})
 

local ship = display.newRect(0,0,50,50)
ship.x = display.contentWidth/2
ship.y = 0
physics.addBody( ship, { density = 2.0, friction = 0.5, bounce = 0.5 } )
[/lua]

Edit: Also, this is helpful for when you are trying to work with physics objects:
physics.setDrawMode( “hybrid” ) – overlays collision outlines on normal Corona objects
 

#12

Try making your ship object heavier.
I don’t use gravity in my game, but I do set my object’s density to 10000 so they don’t move around when they hit other objects.
Probably a bit extreme for your case, but nevertheless try increasing the density.

-Saer

#13

update: I got it to fall down, except now it doesn’t bounce off the ground object. help?

#14

Increase the ‘bounce’ value.

#15

it goes straight through the ground, so the increasing the bounce didn’t help either.

#16

Try this: physics.addBody( ship, “dynamic”, { density = 2.0, friction = 0.5, bounce = 0.3 } )

#17

doesn’t work

#18

Well it should. Try adding the ground’s bodyType in-line rather than post.
physics.addBody(ground, “static”, {friction = .5})

And again, try playing with the ship’s physics values.

#19

now it is flying up again

#20

What is the density of the ship object?