identification = “myRectangle”… self.id + “1”
print(identification)
identification:setFillColor(120,120,120)
Hi! I am trying to use a variable to reference an object. That variable is equal to an object name such as myRectangle1, myRectangle25, and all numbers between. Why isn’t it working?
Thanks in advance,
BRiAN
Hey,
I don’t believe that Lua (hence Corona) allows dynamic variable names. I’ve tried similar to what you have and had no luck. However, you can achieve something similar but with the use of tables:
local id = self.id + 1
identification[“myRectangle” … id] = <object>
and then you can use something like this:
local temp = 25
identification[“myRectangle” … temp]
to refer to the object at reference identification[“myRectangle25”]
Another option is to use tables again indexing them from myRectangle[1] to myRectangle[25]
Rich
What is self? Is this code within a function?
This is my newest code that i am using…
Im trying to get it to so it lights up when it is pressed. The self:setFillColor is the thing that is not working.
[lua]
function changeColor(event, self)
if (event.phase == “began”) then
self:setFillColor(250,0,0)
end
end
rectangles = {}
for i = 1, 25 do
rectangles[i] = display.newRect(i * 30, i * 30,20,20)
if (i < 6) then
rectangles[i].y = 100
end
if (i > 5) and (i < 11) then
rectangles[i].y = 150
end
if (i >10) and (i <16) then
rectangles[i].y = 200
end
if (i >15) and (i <21) then
rectangles[i].y = 200
end
if (i >20) and (i <26) then
rectangles[i].y = 250
end
if ( i % 5 == 0) then
rectangles[i].x = 50
elseif (i % 5 == 1) then
rectangles[i].x = 100
elseif (i % 5 == 2) then
rectangles[i].x = 150
elseif ( i % 5 == 3) then
rectangles[i].x = 200
elseif (i % 5 == 4) then
rectangles[i].x = 250
end
rectangles[i]:addEventListener(“touch”, changeColor)
end
[/lua]
This updated code should work. You might also look at this for some other options.
You were using the self reference, but it was not set up properly.
In any case, just using the event target in the changeColor method is enough, as shown below.
[lua]
function changeColor( event )
if (event.phase == “began”) then
event.target:setFillColor(250,0,0)
end
end
rectangles = {}
for i = 1, 25 do
rectangles[i] = display.newRect(i * 30, i * 30,20,20)
if (i < 6) then
rectangles[i].y = 100
end
if (i > 5) and (i < 11) then
rectangles[i].y = 150
end
if (i >10) and (i <16) then
rectangles[i].y = 200
end
if (i >15) and (i <21) then
rectangles[i].y = 200
end
if (i >20) and (i <26) then
rectangles[i].y = 250
end
if ( i % 5 == 0) then
rectangles[i].x = 50
elseif (i % 5 == 1) then
rectangles[i].x = 100
elseif (i % 5 == 2) then
rectangles[i].x = 150
elseif ( i % 5 == 3) then
rectangles[i].x = 200
elseif (i % 5 == 4) then
rectangles[i].x = 250
end
rectangles[i]:addEventListener( “touch”, changeColor )
end
[/lua]
Hope that helps.
Hey,
I don’t believe that Lua (hence Corona) allows dynamic variable names. I’ve tried similar to what you have and had no luck. However, you can achieve something similar but with the use of tables:
local id = self.id + 1
identification[“myRectangle” … id] = <object>
and then you can use something like this:
local temp = 25
identification[“myRectangle” … temp]
to refer to the object at reference identification[“myRectangle25”]
Another option is to use tables again indexing them from myRectangle[1] to myRectangle[25]
Rich
What is self? Is this code within a function?
This is my newest code that i am using…
Im trying to get it to so it lights up when it is pressed. The self:setFillColor is the thing that is not working.
[lua]
function changeColor(event, self)
if (event.phase == “began”) then
self:setFillColor(250,0,0)
end
end
rectangles = {}
for i = 1, 25 do
rectangles[i] = display.newRect(i * 30, i * 30,20,20)
if (i < 6) then
rectangles[i].y = 100
end
if (i > 5) and (i < 11) then
rectangles[i].y = 150
end
if (i >10) and (i <16) then
rectangles[i].y = 200
end
if (i >15) and (i <21) then
rectangles[i].y = 200
end
if (i >20) and (i <26) then
rectangles[i].y = 250
end
if ( i % 5 == 0) then
rectangles[i].x = 50
elseif (i % 5 == 1) then
rectangles[i].x = 100
elseif (i % 5 == 2) then
rectangles[i].x = 150
elseif ( i % 5 == 3) then
rectangles[i].x = 200
elseif (i % 5 == 4) then
rectangles[i].x = 250
end
rectangles[i]:addEventListener(“touch”, changeColor)
end
[/lua]
This updated code should work. You might also look at this for some other options.
You were using the self reference, but it was not set up properly.
In any case, just using the event target in the changeColor method is enough, as shown below.
[lua]
function changeColor( event )
if (event.phase == “began”) then
event.target:setFillColor(250,0,0)
end
end
rectangles = {}
for i = 1, 25 do
rectangles[i] = display.newRect(i * 30, i * 30,20,20)
if (i < 6) then
rectangles[i].y = 100
end
if (i > 5) and (i < 11) then
rectangles[i].y = 150
end
if (i >10) and (i <16) then
rectangles[i].y = 200
end
if (i >15) and (i <21) then
rectangles[i].y = 200
end
if (i >20) and (i <26) then
rectangles[i].y = 250
end
if ( i % 5 == 0) then
rectangles[i].x = 50
elseif (i % 5 == 1) then
rectangles[i].x = 100
elseif (i % 5 == 2) then
rectangles[i].x = 150
elseif ( i % 5 == 3) then
rectangles[i].x = 200
elseif (i % 5 == 4) then
rectangles[i].x = 250
end
rectangles[i]:addEventListener( “touch”, changeColor )
end
[/lua]
Hope that helps.