want a new object to appear onscreen only after user touches five separate objects.

Solar2D General Questions/Discussion
#1

I want a new object to appear onscreen only after the user touches five separate objects. that are displayed on screen. No Idea what to do. Except it involves if then and I can put object.isVisible = true in the then part. Any help/sample code would be appreciated. I am still very new to corona.

Thanks
Jeremy [import]uid: 127028 topic_id: 25687 reply_id: 325687[/import]

#2

Hey Jeremy.

You could use object.isVisible = true in an “if statement” but I’d probably opt for writing a function like so:

local function createObject()  
 myObj = display.newImage ("theObject.png");  
 myObj.x = 200   
 myObj.y = 200  
 myObj.alpha = 1  
 exampleGroup:insert(myObj)  
  
 function touchTheObject(event)  
 myObj.alpha = .5  
 end  
 myObj:addEventListener( "touch", touchTheObject )  
end

You can then “call” the function anytime you like by simply writing the function name, like this:

createObject()

This is quite powerful because within the function you have a touch event for that specific object. Touching it changes it’s alpha to make it 50% transparent. Outside that function, you could write another function, and call it using a timer every 5 seconds. It would check to see what the alpha of myObj is, and if it is less than 1, set it back to 1 again. The code for such a function would look something like this:

local function alphaTimer()  
 if myObj.alpha \< 1 then  
 myObj.alpha = 1  
 end  
end  
  
myTimer = timer.performWithDelay(5000,alphaTimer, 0)

You could set up a timer which checks the alpha of a number of objects, simply by adding extra if statements to the alphaTimer function, (if myObj2.alpha < 1…etc).

Finally, it’s a reasonably short jump from that, to checking if the alpha of 5 objects is less than 1, and if it is, calling “createObject” as suggested above.

The reason I didn’t write out a full block of code for you is that by doing so, you wouldn’t learn anything. It’s much better to work the solution out than just being given the answer. If you get stuck let me know and I’ll help where I can. The solution I suggest is not the most elegant or best method, but it should work.

Good luck, and welcome to the community:)

Dan [import]uid: 67933 topic_id: 25687 reply_id: 103863[/import]