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Detecting all kinds of shape collisions in Flash - Posted: Thu Apr 03, 2008 12:41 pm

Sanju
King

Joined: 05 Jan 2008
Posts: 16
Location: INDIA

Hi,
Im gonna teach ye how to detect all kinds of collisions in Flash.
In flash the hitTest understands everything as lines,squares,rectangles.
In this tutorial Im gonna teach you how to DETECT COLLISIONS BETWEEN CIRCLES,TRIANGLES and all other shapes you can imagine Laughing

It's very very simple than you imagine Razz

HEREs HOW

For example Ill teach you with a circle.

1)Draw a circle and make it as a movie clip.

2)Draw another circle and make it as a movie clip and name its instance name as "c2".
3)Make 4 small circles(All 4 of the same size).Convert them into movie clips and name their instances as Left,Right,Up and Down respectively.

4)Copy the following actionscript to the tiny circle which you made.NOTE:This is only for the LEFT tiny circle.

Code:

onClipEvent(enterFrame){
if(this.hitTest(_root.c2)){
_root.c2._x-=5;
}
}

5)Copy the following actionscript to the tiny circle which you made.NOTE:This is only for the RIGHT tiny circle.

Code:

onClipEvent(enterFrame){
if(this.hitTest(_root.c2)){
_root.c2._x+=5;
}
}

6)Copy the following actionscript to the tiny circle which you made.NOTE:This is only for the UP tiny circle.

Code:

onClipEvent(enterFrame){
if(this.hitTest(_root.c2)){
_root.c2._y-=5;
}
}

7)Copy the following actionscript to the tiny circle which you made.NOTE:This is only for the DOWN tiny circle.

Code:

onClipEvent(enterFrame){
if(this.hitTest(_root.c2)){
_root.c2._y+=5;
}
}

8)Now give the following actionscript to C2(The other big circle).

Code:

onClipEvent(enterFrame){
if(Key.isDown(37)){
   this._x-=10;
}
}
onClipEvent(enterFrame){
if(Key.isDown(39)){
   this._x+=10;
}
}
onClipEvent(enterFrame){
if(Key.isDown(38)){
   this._y-=10;
}
}
onClipEvent(enterFrame){
if(Key.isDown(40)){
   this._y+=10;
}
}

9)Make three copies of your LEFT and RIGHT tiny circles.And arrange em like shown in the below picture(Arranged at borders of the given shape and the pattern may change according to different shapes.Exactly at the borders of the main shape.).
NOTE:SILVER colour for UP tiny circle,RED colour for RIGHT tiny circle,BLUE colour for DOWN tiny circle and GREEN colour for LEFT tiny circle.

10)Press Ctrl+Enter.

Wasn't that simple Exclamation

If you got any doubts or comments reply here and Ill clarify it as soon as possible.

_________________
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