I represent a rectangular area of the screen. Arithmetic functions take points as arguments and carry out scaling and translating operations to create new instances of me. Rectangle functions create new instances by determining intersections of rectangles with rectangles.

	accessing
	aboveCenter area bottom bottom: bottomCenter bottomLeft bottomRight boundingBox center corner corners extent height innerCorners left left: leftCenter origin right right: rightCenter top top: topCenter topLeft topRight width

	comparing
	= hash hashMappedBy:

	copying

	printing
	encodeForRemoteCanvas encodeForRemoteCanvasB encodePostscriptOn: printOn: propertyListOn: storeOn:

	private
	setOrigin:corner:

rectangle functions

adjustTo:along: amountToTranslateWithin: areasOutside: bordersOn:along: encompass: expandBy: extendBy: forPoint:closestSideDistLen: insetBy: insetOriginBy:cornerBy: intersect: merge: outsetBy: pointNearestTo: quickMerge: rectanglesAt:height: sideNearestTo: translatedToBeWithin: withBottom: withHeight: withLeft: withRight: withSide:setTo: withSideOrCorner:setToPoint: withSideOrCorner:setToPoint:minExtent: withSideOrCorner:setToPoint:minExtent:limit: withTop: withWidth:

	testing
	containsPoint: containsRect: hasPositiveExtent intersects: isTall isWide isZero

	transforming
	align:with: centeredBeneath: flipBy:centerAt: newRectButtonPressedDo: newRectFrom: rotateBy:centerAt: scaleBy: scaleFrom:to: squishedWithin: translateBy:

	truncation and round off
	rounded truncateTo: truncated

	FMP	top
	deltaToEnsureInOrCentered:extra:

	accessing	top
	aboveCenter Answer the point slightly above the center of the receiver.
	area Answer the receiver's area, the product of width and height.
	bottom Answer the position of the receiver's bottom horizontal line.
	bottom:
	bottomCenter Answer the point at the center of the bottom horizontal line of the receiver.
	bottomLeft Answer the point at the left edge of the bottom horizontal line of the receiver.
	bottomRight Answer the point at the right edge of the bottom horizontal line of the receiver.
	boundingBox
	center Answer the point at the center of the receiver.
	corner Answer the point at the bottom right corner of the receiver.
	corners Return an array of corner points in the order of a quadrilateral spec for WarpBlt.
	extent Answer with a rectangle with origin 0@0 and corner the receiver's width @ the receiver's height.
	height Answer the height of the receiver.
	innerCorners Return an array of inner corner points, ie, the most extreme pixels included, in the order of a quadrilateral spec for WarpBlt
	left Answer the position of the receiver's left vertical line.
	left:
	leftCenter Answer the point at the center of the receiver's left vertical line.
	origin Answer the point at the top left corner of the receiver.
	right Answer the position of the receiver's right vertical line.
	right:
	rightCenter Answer the point at the center of the receiver's right vertical line.
	top Answer the position of the receiver's top horizontal line.
	top:
	topCenter Answer the point at the center of the receiver's top horizontal line.
	topLeft Answer the point at the top left corner of the receiver's top horizontal line.
	topRight Answer the point at the top right corner of the receiver's top horizontal line.
	width Answer the width of the receiver.

	comparing	top
	= Answer true if the receiver's species, origin and corner match aRectangle's.
	hash Hash is reimplemented because = is implemented.
	hashMappedBy: My hash is independent of my oop.

copying

top

	printing	top
	encodeForRemoteCanvas
	encodeForRemoteCanvasB
	encodePostscriptOn:
	printOn: Refer to the comment in Object|printOn:.
	propertyListOn: {x=a; y=b; width=c; height=d}
	storeOn: printed form is good for storing too

	private	top
	setOrigin:corner:

	rectangle functions	top
	adjustTo:along: Return a copy adjusted to fit a neighbor that has changed size.
	amountToTranslateWithin: Answer a Point, delta, such that self + delta is forced within aRectangle.
	areasOutside: Answer an Array of Rectangles comprising the parts of the receiver not intersecting aRectangle.
	bordersOn:along:
	encompass: Answer a Rectangle that contains both the receiver and aPoint. 5/30/96 sw
	expandBy: Answer a Rectangle that is outset from the receiver by delta. delta is a Rectangle, Point, or scalar.
	extendBy: Answer a Rectangle with the same origin as the receiver, but whose corner is offset by delta. delta is a Rectangle, Point, or scalar.
	forPoint:closestSideDistLen: Evaluate the block with my side (symbol) closest to aPoint, the approx distance of aPoint from that side, and the length of the side (or 0 if aPoint is beyond the side)
	insetBy: Answer a Rectangle that is inset from the receiver by delta. delta is a Rectangle, Point, or scalar.
	insetOriginBy:cornerBy: Answer a Rectangle that is inset from the receiver by a given amount in the origin and corner.
	intersect: Answer a Rectangle that is the area in which the receiver overlaps with aRectangle. Optimized for speed; old code read: ^Rectangle origin: (origin max: aRectangle origin) corner: (corner min: aRectangle corner)
	merge: Answer a Rectangle that contains both the receiver and aRectangle.
	outsetBy: Answer a Rectangle that is outset from the receiver by delta. delta is a Rectangle, Point, or scalar.
	pointNearestTo: Return the point on my border closest to aPoint
	quickMerge: Answer the receiver if it encloses the given rectangle or the merge of the two rectangles if it doesn't. THis method is an optimization to reduce extra rectangle creations.
	rectanglesAt:height:
	sideNearestTo:
	translatedToBeWithin: Answer a copy of the receiver that does not extend beyond aRectangle. 7/8/96 sw
	withBottom: Return a copy of me with a different bottom y
	withHeight: Return a copy of me with a different height
	withLeft: Return a copy of me with a different left x
	withRight: Return a copy of me with a different right x
	withSide:setTo: return a copy with side set to value
	withSideOrCorner:setToPoint: Return a copy with side set to newPoint
	withSideOrCorner:setToPoint:minExtent: Return a copy with side set to newPoint
	withSideOrCorner:setToPoint:minExtent:limit: Return a copy with side set to newPoint
	withTop: Return a copy of me with a different top y
	withWidth: Return a copy of me with a different width

	testing	top
	containsPoint: Answer whether aPoint is within the receiver.
	containsRect: Answer whether aRect is within the receiver (OK to coincide).
	hasPositiveExtent
	intersects: Answer whether aRectangle intersects the receiver anywhere.
	isTall
	isWide
	isZero

	transforming	top
	align:with: Answer a Rectangle that is a translated by aPoint2 - aPoint1.
	centeredBeneath: Move the reciever so that its top center point coincides with the bottom center point of aRectangle. 5/20/96 sw:
	flipBy:centerAt: Return a copy flipped #vertical or #horizontal, about aPoint.
	newRectButtonPressedDo: Track the outline of a new rectangle until mouse button changes. newFrameBlock produces each new rectangle from the previous. Only tracks while mouse is down.
	newRectFrom: Track the outline of a new rectangle until mouse button changes. newFrameBlock produces each new rectangle from the previous
	rotateBy:centerAt: Return a copy rotated #right, #left, or #pi about aPoint
	scaleBy: Answer a Rectangle scaled by scale, a Point or a scalar.
	scaleFrom:to: Produce a rectangle stretched according to the stretch from rect1 to rect2
	squishedWithin: Return an adjustment of the receiver that fits within aRectangle by reducing its size, not by changing its origin.
	translateBy: Answer a Rectangle translated by factor, a Point or a scalar.

	truncation and round off	top
	rounded Answer a Rectangle whose origin and corner are rounded.
	truncateTo: Answer a Rectangle whose origin and corner are truncated to grid x and grid y.
	truncated Answer a Rectangle whose origin and corner have any fractional parts removed. Answer the receiver if its coordinates are already integral.

	instance creation	top
	center:extent: Answer an instance of me whose center is centerPoint and width by height is extentPoint.
	encompassing: A number of callers of encompass: should use this method.
	fromUser Answer an instance of me that is determined by having the user designate the top left and bottom right corners. The gridding for user selection is 1@1.
	fromUser: Answer a Rectangle that is determined by having the user designate the top left and bottom right corners. The cursor reamins linked with the sensor, but the outline is kept gridded.
	left:right:top:bottom: Answer an instance of me whose left, right, top, and bottom coordinates are determined by the arguments.
	merging: A number of callers of merge: should use this method.
	origin:corner: Answer an instance of me whose corners (top left and bottom right) are determined by the arguments.
	origin:extent: Answer an instance of me whose top left corner is originPoint and width by height is extentPoint.
	originFromUser: Answer an instance of me that is determined by having the user designate the top left corner. The width and height are determined by extentPoint. The gridding for user selection is 1@1.
	originFromUser:grid: Answer an instance of me that is determined by having the user designate the top left corner. The width and height are determined by extentPoint. The gridding for user selection is scaleFactor. Assumes that the sender has determined an extent that is a proper multiple of scaleFactor.