MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH Manual page 576

8.
Enter the following code into the Actions panel:
balance_mc.top = balance_mc._y;
balance_mc.bottom = balance_mc._y;
balance_mc.left = balance_mc._x;
balance_mc.right = balance_mc._x + 100;
balance_mc._x += 50;
balance_mc.handle_btn.onPress = function() {
startDrag(this._parent, false, this._parent.left, this._parent.top,
this._parent.right, this._parent.bottom);
};
balance_mc.handle_btn.onRelease = function() {
stopDrag();
var level:Number = Math.ceil((this._parent._x - this._parent.left -
50) * 2);
this._parent._parent.song_sound.setPan(level);
};
balance_mc.handle_btn.onReleaseOutside =
balance_mc.handle_btn.onRelease;
The
startDrag()
movie clip action.
9. Select Control > Test Movie to use the balance slider.
For more information about the methods of the Sound class, see Sound in the
ActionScript 2.0 Language Reference.
Detecting collisions
The method of the MovieClip class detects collisions in a SWF file. It checks to
hitTest()
see if an object has collided with a movie clip and returns a Boolean value (
You would want to know whether a collision has occurred either to test if the user has arrived
at a certain static area on the Stage, or to determine when one movie clip has reached another.
With , you can determine these results.
hitTest()
You can use the parameters of
the Stage or use the target path of another movie clip as a hit area. When you specify
returns
hitTest() true
target is passed to
hitTest()
they intersect,
hitTest()
returns .
false
You can also use
hitTest()
The following example shows how to detect a collision between a mouse and movie clips on
the Stage.
576 Creating Interaction with ActionScript
parameters ,
left top
to specify the
hitTest()
if the point identified by (
, the bounding boxes of the two movie clips are compared. If
returns . If the two boxes do not intersect,
true
to test a collision between two movie clips.
, , and
right bottom
and coordinates of a hit area on
x y
, ) is a non-transparent point. When a
x y
are variables set in a
or
true false
x
hitTest()
).
and ,
y