Physics body for ground does not line up to the image on iPad devices

Getting Started Newbie Questions
#1

The physics body for my ground is slightly higher than the image of the ground itself. Please note that this only occurs on iPad devices. How can I change this in a manner that it won’t affect the other sizes?

local groundShape = { -halfW \* 1.4, ground.height \* 0.32, halfW \* 1.4, ground.height \* 0.32, halfW \* 1.4, ground.height \* 0.52, -halfW \* 1.4, ground.height \* 0.52} physics.addBody( ground, "static", { friction=1, bounce = 0, shape=groundShape }) --This code creates the ground's physics body, halfW is display.contentCenterX

The attached screenshot shows what it looks like for the iPad device.

Thank you.

#2

Does this have something to do with my config.lua file?

Also, the declaration for the halfW variable is here:

local screenW, screenH, halfW = display.actualContentWidth, display.actualContentHeight, display.contentCenterX
#3

I wouldn’t use those type of calculations for the ground. Is the ground simply a rectangle? If so, why not just let the physics default trace the bounds of the image?

If it’s a rectangle but you need to reduce it to slightly smaller than the actual image bounds, you can use an “offset rectangular body” as described here:

https://docs.coronalabs.com/api/library/physics/addBody.html#offsetangled-rectangular-body

Brent

#4

Thanks Brent, but the image of the ground is actually a lot larger than it seems. I will try to crop it and see what happens.

#5

I have found what is causing the problem the dimensions to the @2x image is not proportionate to the dimensions of the normal sized images.

#6

Fixing the proportions worked.

#7

Does this have something to do with my config.lua file?

Also, the declaration for the halfW variable is here:

local screenW, screenH, halfW = display.actualContentWidth, display.actualContentHeight, display.contentCenterX
#8

I wouldn’t use those type of calculations for the ground. Is the ground simply a rectangle? If so, why not just let the physics default trace the bounds of the image?

If it’s a rectangle but you need to reduce it to slightly smaller than the actual image bounds, you can use an “offset rectangular body” as described here:

https://docs.coronalabs.com/api/library/physics/addBody.html#offsetangled-rectangular-body

Brent

#9

Thanks Brent, but the image of the ground is actually a lot larger than it seems. I will try to crop it and see what happens.

#10

I have found what is causing the problem the dimensions to the @2x image is not proportionate to the dimensions of the normal sized images.

#11

Fixing the proportions worked.