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Mark objects
Mark's objects are useful to mark points in your drawing. They come with
different looks (little circles, discs, squares, boxes, or crosses).
Note that marks behave quite different from other objects. In
particular, you should not confuse a disc mark with a little disc
created as a circle object:
- a mark only obeys the stroke color
- when you scale a mark, it will not change its size (you can change the
mark size from the configuration panel, though)
- the bounding box of a mark only contains the mark's center
- when you rotate a mark, it does not change its orientation
You can change a mark's type and size later.
Sometimes you may wish you had a mark with, say, black boundary and
white interior (because you want to place it on some dark, but
irregular background). The best way to achieve this is to place
two marks, a white disc and a black circle on top of each other.
You could either group one such double-mark and then paste it to the
desired locations (the pasting mechanism will put the center of the mark
at the point location, so you can work as usual with marks), but you can
also just place the white discs. Then set snap to vertex on, and
place the black circles. Or you may want to install such a marker as
an Ipe user object.