From 1030dc837b10a03a02a85d5504cbeec168ce49e2 Mon Sep 17 00:00:00 2001
From: Bernie Innocenti <bernie@codewiz.org>
Date: Mon, 03 May 2010 21:53:47 +0000
Subject: Import XaoS r489 (trunk after version 3.5)

---
(limited to 'help/rest/uiperturbation.txt')

diff --git a/help/rest/uiperturbation.txt b/help/rest/uiperturbation.txt
new file mode 100644
index 0000000..4195af9
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+++ b/help/rest/uiperturbation.txt
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+.. _uiperturbation:
+.. _perturbation:
+
+.. index::
+   pair: menu item; Perturbation
+   pair: command line option; perturbation
+   pair: command; perturbation
+
+Perturbation
+============
+
+Perturbation is a simple trick which changes the point at which orbits start.
+Traditionally zero is used, but other values can generate interesting results
+too.
+
+On enabling this function from the menu, you will be asked for a complex number
+specifying the perturbation. It is a toggle; selecting it again resets the
+perturbation to zero without prompting.
+
+It can be used to specify a complex number representing a point on the screen.
+If you hit the B key instead of using the menu, the current mouse position is
+used. This too is a toggle, so B again will disable perturbation by setting it
+to zero.
+
+This function only has an effect for certain formulae (like the
+:ref:`Mandelbrot set <mandel>`) and only then in :ref:`Mandelbrot mode
+<uimandelbrot>`.
+
+**Available as**: menu item
+
+**Syntax**:(perturbation complex)
+
+This is the scripting-language variation of the perturbation function. Instead
+of toggling, you always specify the perturbation to use. Use 0 0 to disable
+perturbation.
+
+**Available as**: command line option, command
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