This class represents a quadratic bezier segment between two points

Instance variables:
via <Point> The additional control point (OFF the curve)

	converting
	asBezier2Segment asIntegerSegment

	initialize
	from:to: from:to:via: from:to:withMidPoint: from:to:withMidPoint:at:

	printing
	printOn: printOnStream:

	testing
	hasZeroLength isBezier2Segment isStraight

	vector functions
	length lineSegmentsDo: tangentAt: tangentAtEnd tangentAtStart valueAt:

	accessing	top
	bounds Return the bounds containing the receiver
	via Return the control point

	converting	top
	asBezier2Segment Represent the receiver as quadratic bezier segment
	asIntegerSegment Convert the receiver into integer representation

	initialize	top
	from:to: Initialize the receiver as straight line
	from:to:via: Initialize the receiver
	from:to:withMidPoint: Initialize the receiver with the pointOnCurve assumed at the parametric value 0.5
	from:to:withMidPoint:at: Initialize the receiver with the pointOnCurve at the given parametric value

	printing	top
	printOn: Print the receiver on aStream
	printOnStream:

	testing	top
	hasZeroLength Return true if the receiver has zero length
	isBezier2Segment Return true if the receiver is a quadratic bezier segment
	isStraight Return true if the receiver represents a straight line

	vector functions	top
	length Return the length of the receiver
	lineSegmentsDo: Evaluate aBlock with the receiver's line segments
	tangentAt: Return the tangent at the given parametric value along the receiver
	tangentAtEnd Return the tangent for the last point
	tangentAtStart Return the tangent for the first point
	valueAt: Evaluate the receiver at the given parametric value

	instance creation	top
	from:to:via:
	from:to:withMidPoint:
	from:to:withMidPoint:at:
	from:via:to:
	from:withMidPoint:at:to:
	from:withMidPoint:to: