Hippani built-in objects

[boowho]

Where is the reference documentation for this code located?

For example,  FlakeDetails[0].Sprite.Y......  The FlakeDetails is obviously a user defined object, but where are the methods, etc of that object defined??  This code is from one of the demos by Hippany called Snow Globe.   I couldn't find any other code within the project where the object structure could be defined. So where is it??

Please help if you can.

Boowoho

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Timer+=TimeChange; //Increase the time by the amount of time that has changed since the last update.



if(Timer>2){ //When the time reaches 2 frames, create a new Flake.

Timer=0; //Reset the time.

DuplicateCount++; //Increase the script id

var NewFlake=ItemDuplicate("MainFlake","Flake"+DuplicateCount); //create a new Flake with a new script id.

var NewFlakeDetails=CreateFlakeDetails("Flake"+DuplicateCount,NewFlake); //create new details.

FlakeDetails.push(NewFlakeDetails); //add the new details to the details array.



if(FlakeDetails[0].Sprite.Y>(GetMovieHeight()+20)){ //if the first flake in the list goes off the bottom of the movie, delete it.

var OldDetails=FlakeDetails.shift(); //remove the first details from the details array

ItemDelete(OldDetails.ScriptId); //delete the Flake

}



}



for(var i=0;i<FlakeDetails.length;i++){ //Loop through the array of Flakes.

FlakeDetails.Sprite.X+=FlakeDetails.VelocityX*TimeChange; //Move the Flake using the velocity and the amount of time that has changed since the last update.

FlakeDetails.Sprite.Y+=FlakeDetails.VelocityY*TimeChange;

FlakeDetails.Sprite.Angle+=FlakeDetails.VelocityAngle*TimeChange; //Rotate the Flake

}

[Jack]

It's defined in the "General" script section - the code you are referencing is in the "On Update" method for the Movie. Here is the code from the General section:

var FlakeDetails=new Array(); //Keep a log of the Flakes and details about their speed etc.

var DuplicateCount=0; //Use this value to give each Flake a unique script Id.

var Timer=0; //Wait a small amount of time before creating a new Flake.



//Function to create an object containing details of each Flake e.g. velocity, script id



function CreateFlakeDetails(NewScriptId,NewSprite){

var NewDetails=new Object();

NewDetails.ScriptId=NewScriptId; //Store the script Id so the Flake can be deleted later.

NewDetails.Sprite=NewSprite; //Store the image sprite.

NewDetails.Sprite.X=Math.random()*GetMovieWidth(); //start position

NewDetails.Sprite.Y=-20; //start position

NewSprite.Width*=.3+(Math.random()*.7); //Set random width

NewSprite.Height=NewSprite.Width;

NewDetails.VelocityX=-3+(Math.random()*6); //create random velocity between -3 and +3

NewDetails.VelocityY=NewSprite.Width*.3; //Y velocity based on width, bigger snowflakes fall faster.

NewDetails.VelocityAngle=-10+(Math.random()*20); //random spin between -10 and +10



return NewDetails;

}

[boowho]

Yes, you are right.... I forgot to reference the "General" section code. Still, I have a second question

In the "general" section there is an object (NewDetails) defined as an object().

Then a reference to NewDetails.Sprite is made as well as NewDetails.Sprite.X.

With normal OO the object structure (Property, Methods, etc) would have to be formally defined. Apparently not so in JS?

Where would the structure definition for NewDetails occur??  Thanks for your reply, BTW.

[Hippani]

In js there are no classes, you can just attach values to an object.

e.g.
function createPoint(X,Y);
var A=new Object();
A.X=X;
A.Y=Y;
return A;
}

var newPoint=createPoint(5,6);
alert(newPoint.X+","+newPoint.Y);

Note: There is also a system called JSON which we don't support yet.