Deletion with arrays - GameCreators Forum

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Kozax

8

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Joined: 28th Jul 2015

Location: London, UK

Posted: 4th Sep 2015 19:34 Edited at: 4th Sep 2015 19:35

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Hello,

I have created an array to create boxes per x seconds.
I want to delete the boxes with two conditions.
One after the tween ends and another if the circle(player) touches them.

+ Code Snippet

for m = 0 to Boxes.length step 1

If GetSpriteExists(Boxes[m]) = 1

       //Tween that reduces alpha color
       PlayTweenSprite(BoxTween, Boxes[m], 0)

       //Delete after some time
       If GetSpriteColorAlpha(Boxes[m]) <= 5 
		DeleteSprite(Boxes[m])
		Boxes.remove(m)	
       EndIf

       //Delete on collision
       If GetSpriteCollision(Boxes[m], Circle) = 1 
		Boxesvar = Boxesvar + 1				
		PlaySound(BoxesSound, Volume)
                DeleteSprite(Boxes[m])
		Boxes.remove(m)	
       EndIf
EndIf
				
next m

If I touch the Box it works but if I let the box disappear it shows the error Index:0, Array Length: <Empty> in main.agc at line 209.
Line 209 is : If GetSpriteCollision(Boxes[m], Circle) = 1

Can anyone help?

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Hockeykid

DBPro Tool Maker

16

Years of Service

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Joined: 26th Sep 2007

Location:

Posted: 4th Sep 2015 20:09 Edited at: 4th Sep 2015 20:10

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You are deleting the box from the array when it fades out, but then the "GetSpriteCollision()" command is called and it is attempting to get the value for "Boxes[m]" which has already been removed.

This should work:

+ Code Snippet

for m = 0 to Boxes.length step 1

	removeBox as integer : removeBox = 0
	If GetSpriteExists(Boxes[m]) = 1

		//Tween that reduces alpha color
		PlayTweenSprite(BoxTween, Boxes[m], 0)

		//Delete after some time
		If GetSpriteColorAlpha(Boxes[m]) <= 5 
			removeBox = 1
		EndIf

		//Delete on collision
		If GetSpriteCollision(Boxes[m], Circle) = 1 
			Boxesvar = Boxesvar + 1				
			PlaySound(BoxesSound, Volume)
			removeBox = 1
		EndIf

		if (removeBox = 1)
			DeleteSprite(Boxes[m])
			Boxes.remove(m)	
		endif
	EndIf
				
next m

Also, you probably should be calling "PlayTweenSprite" every loop. Just call it once to start the tween and it should update itself.

Sean

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Kozax

8

Years of Service

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Joined: 28th Jul 2015

Location: London, UK

Posted: 4th Sep 2015 20:27

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Thank you very much! It works !

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