This question is a little goofy and I’m not really sure how to explain it.
Below is a simple example of what I’m trying to accomplish.
[lua]
spaceShip = display.newCircle(50,50,50)
function move(object, axis, value)
object.axis = object.axis + value
end
move(spaceShip, “y”, 10)
[/lua]
Thanks!
You can’t do that. You are creating a new variable called “axis” not setting .y. You have to do:
function move( object, axis, value ) if axis == "y" then object.y = object.y + value else object.x = object.x + value end end
Rob
Alternatively if the field exists on the object you could do this:
function incr( object, fieldName, value ) if(object and object[fieldName]) then object[fieldName] = object[fieldName] + value end end
This assumes of course that the value in the field and the value in ‘value’ argument are numbers.
Ah yes I should have thought of that. Thanks roaminggamer!
To make my sample code work I would have needed to write it like this.
[lua]
spaceShip = display.newCircle(50,50,50)
function move(object, axis, value)
object[axis] = object[axis] + value
end
move(spaceShip, “y”, 10)
[/lua]
By the way, there is a more efficient way to do this specific example.
https://docs.coronalabs.com/daily/api/type/DisplayObject/translate.html
spaceShip:translate( 10, 0 ) -- Move +10 x; No change in yYou can’t do that. You are creating a new variable called “axis” not setting .y. You have to do:
function move( object, axis, value ) if axis == "y" then object.y = object.y + value else object.x = object.x + value end end
Rob
Alternatively if the field exists on the object you could do this:
function incr( object, fieldName, value ) if(object and object[fieldName]) then object[fieldName] = object[fieldName] + value end end
This assumes of course that the value in the field and the value in ‘value’ argument are numbers.
Ah yes I should have thought of that. Thanks roaminggamer!
To make my sample code work I would have needed to write it like this.
[lua]
spaceShip = display.newCircle(50,50,50)
function move(object, axis, value)
object[axis] = object[axis] + value
end
move(spaceShip, “y”, 10)
[/lua]
By the way, there is a more efficient way to do this specific example.
https://docs.coronalabs.com/daily/api/type/DisplayObject/translate.html
spaceShip:translate( 10, 0 ) -- Move +10 x; No change in y