require 'bizzieGeometry'
require 'bizzieMath'
require 'bizziePath'

#region subclasses must implement doRegionLine, doRegionPoint
class Region
  # numLines >= 2
  def doRegionPoints(numLines, epsilon)
    doRegionLines {|line, val|
      line.doPath
    }
  end
  
  def doRegionLines(numLines)
    val = 0
    while val <= numLines
      yield doRegionLine(val, numLines), val
      val += 1
    end
  end
end

# represent the region between two lines
class TwoLineRegion < Region
  def initialize(val1, val2, val3 = 0, val4 = 0)
    
    @line1 = val1
    @line2 = val2
  end
  
  def doRegionPoint(num, maxNum, epsilon)
    return doRegionLine(num, maxNum).doPathPoint(epsilon)
  end
  
  def doRegionLine(num, maxNum)
    newLine1 = Line.new(@line1.p1, @line2.p1)
    newLine2 = Line.new(@line1.p2, @line2.p2)
    epsilon = (num/maxNum)
    return Line2d.new(newLine1.doPathPoint(epsilon), newLine2.doPathPoint(epsilon))
  end
  
  def doCrossHatchLines(epsilon, initialSkip)
    val1 = 0
    val2 = initialSkip * epsilon
    while val2 <= 1 + $epsilonVal
      yield Line2d.new(@line1.doPathPoint(val1), @line2.doPathPoint(val2)), val1
    
      val2 += epsilon
      val1 += epsilon
    end
    
    val1 = initialSkip * epsilon
    val2 = 0
    while val1 <= 1 + $epsilonVal
      yield Line2d.new(@line1.doPathPoint(val1), @line2.doPathPoint(val2)), val2
    
      val1 += epsilon
      val2 += epsilon
    end
  end
end