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PinComp, PinView, PinGraphic, PSPin

pin connector subject, view, structured graphic, and PostScript external representation SlidingPin, FixedPin - rubberbands used in pin manipulation

#include <Unidraw/Components/pin.h>

PinComp is a Connector subclass that supports connectivity with zero degrees of freedom. It uses a PinGraphic to store its graphical attributes. PinView is a GraphicView for displaying the pin. PSPin is a PostScriptView that externalizes the subject's information in PostScript form.

SlidingPin and FixedPin are special rubberbands used to implement the animation effects that pins produce during direct manipulation. A SlidingPin is a circle with crosshairs (duplicating the appearance of a PinGraphic) that follows the mouse position, while a FixedPin draws a static circle with crosshairs.

The constructor takes an optional PinGraphic that defines the pin's graphical attributes. The pad has fixed mobility initially
PinComp (un)interprets a subset of commands that connectors can generally interpret, namely MoveCmd, BrushCmd, AlignCmd, MobilityCmd, DeleteCmd, and CutCmd.
PinComp redefines these functions to return and assign its _mobility protected member. The pin has fixed mobility initially.
Return the Pin graphic that defines the line's attributes. GetPin is simply a more specific form of the GetGraphic operation.

Create an PinView, optionally supplying the subject.
PinView interprets AlignToGridCmd to align its lower left to the grid.
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PinViews respond only to manipulation by GraphicCompTools, MoveTools, and ConnectTools. PinView inherits its MoveTool response from ConnectorView. GraphicCompTool will let the user place the pin at a particular position. Placement will be influenced by gravity, if any. PinView creates a ConnectManip in response to the ConnectTool, which will exhibit a gravational attraction to potential target connectors. PinView will produce a ConnectCmd to connect the pin to its target. A pin connected in this way will receive floating mobility.
Return the subject.

Return the PinGraphic that defines the pin's attributes. GetPin is simply a more specific form of the GetGraphic operation.
A helper function that creates a PinComp subject with the given pin graphic. This function produces the proper subject when the GraphicCompTool's manipulator is interpreted. Subclasses can redefine this operation to return a PinComp subclass, thus eliminating the need to reimplement InterpretManipulator.
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Helper functions used by CreateManipulator and InterpretManipulator to create and interpret the manipulators associated with GraphicCompTool and ConnectTool.

Create a PinGraphic, optionally specifying its center and a graphic from which to obtain its default graphics attributes.
Return the PinGraphic's original center coordinates as specified in the constructor.

Construct a PostScript external representation of the given subject, if any.

BrushCmd(3U), ConnectTool(3U), Connector(3U), ConnectorView3U), Event(3I), Graphic(3U), GraphicCompTool(3U), Grid(3U), MoveTool(3U), PatternCmd(3U), PostScriptView(3U), Rubband(3I), Transformer(3I), Viewer(3U), align(3U), edit(3U), manips(3U), transforms(3U)