# Collision detection help

**URL:** <https://forum.kirupa.com/t/collision-detection-help/253857>\
**Category:** Uncategorized\
**Created:** [March 5, 2008, 9:43pm UTC](https://forum.kirupa.com/t/collision-detection-help/253857 "2008-03-05T21:43:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Echelon\_5](https://avatars.discourse-cdn.com/v4/letter/e/c77e96/32.png) [@Echelon\_5](https://forum.kirupa.com/u/Echelon_5)\
**Post date:** [March 5, 2008, 9:43pm UTC](https://forum.kirupa.com/t/collision-detection-help/253857/1 "2008-03-05T21:43:44Z")

</div>

[FONT=Times New Roman][SIZE=3]Hello, I am having trouble with detecting collisions in a game I am making. A part of my game requires bubbles to be generated from a character and for them to interact with each other (like in bubble bobble for nes). Currently I am trying to do this by having one bubble that is duplicated and given a new name of bubble# with # being a number that is generated by a counter in the character’s movieclip. The problem with this is that I have no way of telling the newly spawned bubbles to interact with bubble1,2,3,4,5…. [/SIZE][/FONT]

[FONT=Times New Roman][SIZE=3]I have included a scratch version of the bubbles with this post, and will give the actionscript applied to each movieclip for those of you who do not wish to download the file. [/SIZE][/FONT]

[FONT=Times New Roman][SIZE=3]Also, I should note that I am using Actionscript 2.0[/SIZE][/FONT]

[FONT=Times New Roman][SIZE=3]Character (red square):[/SIZE][/FONT]

[FONT=Times New Roman][SIZE=3]onClipEvent (load) {[/SIZE][/FONT]  
[SIZE=3][FONT=Times New Roman]readytofire = true[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]\_root.bubblenumber = 1[/FONT][/SIZE]  
[FONT=Times New Roman][SIZE=3]}[/SIZE][/FONT]  
[FONT=Times New Roman][SIZE=3]onClipEvent (enterFrame) {[/SIZE][/FONT]  
[SIZE=3][FONT=Times New Roman]trace(n)[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]\_root.bubblenumber += 1[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]n = \_root.bubblenumber[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]if (Key.isDown(Key.UP)) {[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_y -= 10;[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]}[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]if (Key.isDown(Key.DOWN)) {[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_y += 10;[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]}[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]if (Key.isDown(Key.LEFT)) {[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_x -= 10;[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]}[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]if (Key.isDown(Key.RIGHT)) {[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_x += 10;[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]}[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]if (Key.isDown(Key.SPACE) && readytofire) {[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]\_root.bubble.duplicateMovieClip(“bubble”+n, n, {\_x:this.\_x, \_y:this.\_y});[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]countdowntimer = 10[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]readytofire = false[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]}[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]countdowntimer -= 1[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]if(countdowntimer \< 1){[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]readytofire = true[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]}[/FONT][/SIZE]  
[FONT=Times New Roman][SIZE=3]}[/SIZE][/FONT]

[FONT=Times New Roman][SIZE=3]Original bubble (blue circle):[/SIZE][/FONT]

[FONT=Times New Roman][SIZE=3]onClipEvent(load){[/SIZE][/FONT]  
[SIZE=3][FONT=Times New Roman]b = \_root.bubblenumber[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]h = Number \< b [/FONT][/SIZE]  
[FONT=Times New Roman][SIZE=3]}[/SIZE][/FONT]  
[FONT=Times New Roman][SIZE=3]onClipEvent(enterFrame){[/SIZE][/FONT]  
[SIZE=3][FONT=Times New Roman]this.\_y -= 5[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]if(\_root.roof.hitTest(this.\_x,this.\_y,true)){[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_y += 5[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_x -= 2[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]}[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]if(\_root.roof2.hitTest(this.\_x,this.\_y,true)){[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_y += 5[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_x += 2[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]}[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]if(\_root.roof3.hitTest(this.\_x,this.\_y,true)){[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_y += 5[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_x -= 2[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]}[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]if(\_root.roof4.hitTest(this.\_x,this.\_y,true)){[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_y += 5[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_x += 2[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]}[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]if(\_root[“bubble”+h].hitTest(this.\_x,this.\_y,true)){ [/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_x = 100[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]this.\_y = 100[/FONT][/SIZE]  
[SIZE=3][FONT=Times New Roman]}[/FONT][/SIZE]  
[FONT=Times New Roman][SIZE=3]}[/SIZE][/FONT]