/*

		dw_clip.js - clip methods for use with dw_core.js

		developed from study of code from dynduo, brainjar and bratta

		i.e., http://www.dansteinman.com/dynduo/

		http://www.brainjar.com/ and http://www.dhtmlcentral.com/

		

		This code is from Dynamic Web Coding 

    at http://www.dyn-web.com/

    See Terms of Use at http://www.dyn-web.com/bus/terms.html

    Permission granted to use this code 

    as long as this entire notice is included.

*/



dynObj.prototype.getClipValues = function() {

  if (typeof this.css.clip != "undefined") {

    var clipVal = new Array();

    if (typeof this.css.clip.top != "undefined") {

  		clipVal[0] = this.css.clip.top;

  		clipVal[1] = this.css.clip.right;

  		clipVal[2] = this.css.clip.bottom;

  		clipVal[3] = this.css.clip.left;

  	} else {

  		clipVal = this.css.clip.slice(5,-1).split(' ');

  			for (var i=0; i<4; i++) {

  				clipVal[i] = parseInt(clipVal[i]);

  			}

    } 

    return clipVal;

  } 

  else return false;

}



dynObj.prototype.clipBy = function(top,rt,btm,lft) {

	if (typeof this.css.clip != "undefined") {

    if (typeof this.css.clip.top != "undefined") {

    	this.css.clip.top += top;

  		this.css.clip.right += rt;

  		this.css.clip.bottom += btm;

  		this.css.clip.left += lft;

    } else {

      var clipVal = this.getClipValues();

    	this.css.clip = "rect(" + Number(clipVal[0]+top) + "px, " + Number(clipVal[1]+rt)  + "px, " + Number(clipVal[2]+btm) + "px, " + Number(clipVal[3]+lft) + "px)";

    } 

  }

}



dynObj.prototype.clipTo = function(top,rt,btm,lft) {

	 if (typeof this.css.clip != "undefined") {

    if (typeof this.css.clip.top != "undefined") {

    	this.css.clip.top = top;

  		this.css.clip.right = rt;

  		this.css.clip.bottom = btm;

  		this.css.clip.left = lft;

    } else {

      this.css.clip = "rect("+top+"px, "+rt+"px, "+btm+"px, "+lft+"px)";

    }

  }

}