A TransformMorph introduces a 2-D transformation between its (global) coordinates and the (local) coordinates of its submorphs, while also clipping all display to its bounds. Specifically, with no offset, angle or scaling, a submorph with coordinates (0@0) will appear exactly at the topLeft of the windowMorph (its position). Rotation and scaling are relative to the local origin, (0@0).

TransformMorphs operate with two different display strategies, depending on whether the transformation is a pure translation or not. If so, then they simply use a clipping canvas and display their submorphs with the appropriate offset. If the transformation includes scaling or rotation, then a caching canvas is used, whose active area covers the fullBounds of the submorphs intersected with the source quadrilateral corresponding to the window bounds.

	change reporting
	invalidRect:from:

	drawing
	colorForInsets drawSubmorphsOn:

	events
	grabTransform transformFrom:

	geometry
	containsPoint: contentBounds fullBounds privateFullMoveBy: submorphBounds wantsHaloFromClick

	initialization
	initialize

	menu
	addCustomMenuItems:hand:

	submorphs-accessing

	accessing	top
	angle
	angle:
	offset
	offset:
	scale
	scale:
	setOffset:angle:scale:
	smoothing:
	smoothingOff
	smoothingOn
	transform
	transform:

	change reporting	top
	invalidRect:from: Translate damage reports from submorphs by the scrollOffset.

	drawing	top
	colorForInsets Return the color to be used for shading inset borders. The default is my own color, but it might want to be, eg, my owner's color. Whoever's color ends up prevailing, the color itself gets the last chance to determine, so that when, for example, an InfiniteForm serves as the color, callers won't choke on some non-Color object being returned
	drawSubmorphsOn: Display submorphs back to front

	events	top
	grabTransform Return the transform for the receiver which should be applied during grabbing
	transformFrom: Return a transform to map coorinates of uberMorph, a morph above me in my owner chain, into the coordinates of my submorphs.

	geometry	top
	containsPoint:
	contentBounds
	fullBounds Overridden to clip submorph hit detection to my bounds.
	privateFullMoveBy: Private! Relocate me, but not my subMorphs.
	submorphBounds Private. Compute the actual full bounds of the receiver
	wantsHaloFromClick

	initialization	top
	initialize

	menu	top
	addCustomMenuItems:hand: Add morph-specific items to the given menu which was invoked by the given hand. This method provides is invoked both from the halo-menu and from the control-menu regimes.

submorphs-accessing

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