TransformMorph


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TransformMorph

Last updated at 12:29 pm UTC on 17 January 2006

"Class comment:" (from 3.7a)

"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).

instance var	type	description
transform	MorphicTransform	The coordinate transform between my coordinates and the local coordinates of my submorphs.
smoothing	Boolean	Perform smoothing of my contents during drawing
localBounds	Rectangle or nil	caches the value of #localSubmorphBounds for performance

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."