functions and protoypes

[wainui]

functions and protoypes.

Can someone explain to me how to use the prototype function.

I have built a game with a dog that slides to a target point when the mouse is clicked. I have done this with a function. At some point I am going to want to have 2 dogs and want to use the same function. Is this possible by making a prototype? And if so how?

thanks

[nunomira]

Hi,

here you have a simple example:

code:

---

MovieClip.prototype.resize = function() {

	this._xscale = this._xscale * 2;

	this._yscale = this._yscale * 2;

};

//if you have a mc called ball_mc

//this doubles its size:

ball_mc.resize();

---

now you can apply this method to any movie clip

you can also have your own objects.
for example a paper sheet with color and size:

code:

---

Paper = function (pColor, pSize) {

	this.pColor = pColor;

	this.pSize = pSize;

};

p1 = new Paper("white", "A4");

trace(p1.pColor);

Paper.prototype.changeColor = function(pColor) {

	this.pColor = pColor;

};

p1.changeColor("black");

trace(p1.pColor);

---

this is not the most correct way to modify an object properties... But as an example I think it will do

[wainui]

thanks for the reply!

I am trying to force myself to get out of flash 5 --> MX. I have been using for a while but never bother to start using functions etc properly.

I assume that by using e.g..

MovieClip.prototype.resize = function() {
this._xscale = this._xscale * 2;
this._yscale = this._yscale * 2;
};


That this function will apply to all movieClips?
whereas if I want to make just for a dog I would call it something like..

dog.prototype.resize = function() {
this._xscale = this._xscale * 2;
this._yscale = this._yscale * 2;
};

thanks again... found a great site with advanced functions I should share as well http://proto.layer51.com/

[nunomira]

if the dog is an object that you created, like my paper sheet, that is true.
If it is a movie clip, it is not.

this all has to do with oop in flash
here's a tutorial
http://www.debreuil.com/docs/

also, Colin Mook's asdg2 is great...