Handles and Connection Points
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All objects have handles that generally allow the
object to be resized. The usual handles are small boxes with a green
fill. You can move these handles by dragging them with the mouse.
This will resize the object. If the handles have a dark blue fill
instead then
the object can not be resized. This is typical of boxes that resize
automatically as you enter text into the box.
Lines have handles at each end that are also green (but also have a
small internal cross identifying it as a connection point--see
below). Once again you can resize the line simply by grabbing these
handles with the left mouse button and moving the handle around.
Some lines (e.g., a polyline) have internal handles that are coloured
orange. These handles have restricted movement and may also move as
you move the line end-points.
Most objects also have connection points
that identify locations on the shape to which lines can be
snapped. (An Arc, for example, does not have any connection points.)
They are identified as the small blue crosses on the edges of the
objects. The handles on the end of lines also have crosses identifying
connection points. A line's connection point becomes attached to the
connection point of an object, as indicated by the line's green handle
becoming red. Moving the object will also move all of the attached
lines.
The Line shape can have extra connection points added to it through
the middle mouse button menu. Each new connection point is added to
evenly space all of the connection points along the line.
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