Range

/*
    CASA Lib for ActionScript 3.0
    Copyright (c) 2011, Aaron Clinger & Contributors of CASA Lib
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*/
package org.casalib.math {
    import org.casalib.math.Percent;
    
    /**
        Creates a standardized way of describing and storing an extent of variation/a value range.
        
        @author Aaron Clinger
        @author Mike Creighton
        @version 03/26/10
    */
    public class Range {
        protected var _end:Number;
        protected var _start:Number;
        
        
        /**
            Creates and defines a Range object.
            
            @param start: Beginning value of the range.
            @param end: Ending value of the range.
            @usageNote You are not required to define the range in the contructor you can do it at any point by calling {@link #setRange}.
        */
        public function Range(start:Number, end:Number) {
            super();
            
            this.setRange(start, end);
        }
        
        /**
            Defines or redefines range.
            
            @param start: Beginning value of the range.
            @param end: Ending value of the range.
        */
        public function setRange(start:Number, end:Number):void {
            this.start = start;
            this.end   = end;
        }
        
        /**
            The start value of the range.
        */
        public function get start():Number {
            return this._start;
        }
        
        public function set start(value:Number):void {
            this._start = value;
        }
        
        /**
            The end value of the range.
        */
        public function get end():Number {
            return this._end;
        }
        
        public function set end(value:Number):void {
            this._end = value;
        }
        
        /**
            The minimum or smallest value of the range.
        */
        public function get min():Number {
            return Math.min(this.start, this.end);
        }
        
        /**
            The maximum or largest value of the range.
        */
        public function get max():Number {
            return Math.max(this.start, this.end);
        }
        
        /**
            Determines if value is included in the range including the range's start and end values.
            
            @return Returns true if value was included in range; otherwise false.
        */
        public function isWithinRange(value:Number):Boolean {
            return (value <= this.max && value >= this.min);
        }
        
        /**
            Calculates the percent of the range.
            
            @param percent: A {@link Percent} object.
            @return The value the percent represent of the range.
        */
        public function getValueOfPercent(percent:Percent):Number {
            var min:Number;
            var max:Number;
            var val:Number;
            var per:Percent = percent.clone();
            
            if (this.start <= this.end) {
                min = this.start;
                max = this.end;
            } else {
                per.decimalPercentage = 1 - per.decimalPercentage;
                
                min = this.end;
                max = this.start;
            }
            
            val = Math.abs(max - min) * per.decimalPercentage + min;
            
            return val;
        }
        
        /**
            Returns the percentage the value represents out of the range.
            
            @param value: An integer.
            @return A Percent object.
        */
        public function getPercentOfValue(value:Number):Percent {
            return new Percent((value - this.min) / (this.max - this.min));
        }
        
        /**
            Determines if the range specified by the range parameter is equal to this range object.
            
            @param percent: A Range object.
            @return Returns true if ranges are identical; otherwise false.
        */
        public function equals(range:Range):Boolean {
            return this.start == range.start && this.end == range.end;
        }
        
        /**
            Determines if this range and the range specified by the range parameter overlap.
            
            @param A Range object.
            @return Returns true if this range contains any value of the range specified; otherwise false.
        */
        public function overlaps(range:Range):Boolean {
            if (this.equals(range) || this.contains(range) || range.contains(this) || this.isWithinRange(range.start) || this.isWithinRange(range.end))
                return true;
            
            return false;
        }
        
        /**
            Determines if this range contains the range specified by the range parameter.
            
            @param A Range object.
            @return Returns true if this range contains all values of the range specified; otherwise false.
        */
        public function contains(range:Range):Boolean {
            return this.start <= range.start && this.end >= range.end;
        }
        
        /**
            @return A new range object with the same values as this range.
        */
        public function clone():Range {
            return new Range(this.start, this.end);
        }
    }
}