Then, Ipe will not have to wait until the previewer or printing process terminates. The Postscript preamble has not been described before. It can be used to put a piece of Postscript code at the beginning of the Postscript part of the Ipe picture. It will be executed within the Ipedict environment, but before processing the image. It is provided to make it easy to change Postscript parameters like linejoin , linecap , or miterlimit for a drawing.
Drawings containing sharp angles sometimes look nicer when round line joins are used.
This can be achieved by setting the Postscript preamble to 1 setlinejoin Here is a figure illustrating the effect of the Postscript commands setlinecap and setlinejoin . Note that even if you specify a miter join, angles that are sharper than a certain threshold will be drawn as bevel joins. The LaTeX and Postscript preambles are saved with your drawing. When the drawing is loaded back, the previously set preambles will appear in the boxes in the configuration panel. For the preview command and the LaTeX preamble there are two different defaults in the X resources, one for ipe mode , one for mipe mode .