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unique_style0D45
Participant
April 13, 2015
Answered

Instantiate a class from a dynamic variable

  • April 13, 2015
  • 1 reply
  • 328 views

Hi everyone. I am just working on a little tilebased project, and I would like to be able to place any of my tile objects with one bit of code.

Right now I've just got this in my left click function:

__________________________________

if(tileType == "grass"){

    var grasstile:grass = new grass;

    addObj(grasstile, absMX, absMY);

}else if(tileType == "dirt"){

    var dirttile:dirt = new dirt;

    addObj(dirttile, absMX, absMY);

}

__________________________________

Where tileType is a variable that changes depending on what tile the user has select from the menu, and addObj is a custom function for adding objects.

However there are many tiles, and I'd much prefer to be able to use one bit of generation code rather than duplicating it over and over again for every tile.

Is there a way to do this?

Thank you very much for your time.

Brendan

This topic has been closed for replies.
Correct answer Ned Murphy

I think the following sample will answer that as far as using a string to dynamically define a new class object, just translate it to your situation...

var ClassRef:Class = Class(getDefinitionByName("className"));

var classInstance:* = new ClassRef();

addChild(classInstance);

1 reply

Ned Murphy
Ned Murphy
Legend
April 13, 2015

Why do you have to create new code for each tile?  What about the code you show makes it unique to each tile?  If there is something unique to each tile then that is the portion of the code that you need to focus on making generic so that it can be applied for any tile.

U
unique_style0D45Author
Participant
April 13, 2015

Sorry, maybe I didn't explain the issue properly. Each tile is unique in that it has a different graphic and properties corresponding to what it is: grass, dirt, wood, etc. Each one with properties like friction, breakable, movable, etc.

Right now I am using the code as such:

if(tileType == "grass"){

    var grasstile:grass = new grass;

    addObj(grasstile, absMX, absMY);

}else if(tileType == "dirt"){

    var dirttile:dirt = new dirt;

    addObj(dirttile, absMX, absMY);

}else if(tileType == "wood"){

    var woodtile:wood = new wood;

    addObj(woodtile, absMX, absMY);

}else if(tileType == "sand"){

    var sandtile:sand = new sand;

    addObj(sandtile, absMX, absMY);

}

...etc


If I do this for each tile, it's going to be a huge list, and it seems like a very ineffiecnt way of doing things. I was hoping for something more like this:


var tileType:String = "grass";

var [tileType+"tile"]:tileType = new tileType;

addObj([tileType+"tile"], absMX, absMY);

That way I can just change the tileType variable and generate each tile with a single bit of code, rather than duplicating it over and over.

Ned Murphy
Ned MurphyCorrect answer
Legend
April 13, 2015

I think the following sample will answer that as far as using a string to dynamically define a new class object, just translate it to your situation...

var ClassRef:Class = Class(getDefinitionByName("className"));

var classInstance:* = new ClassRef();

addChild(classInstance);

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