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Diffstat (limited to 'help/rest/uiperturbation.txt')
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diff --git a/help/rest/uiperturbation.txt b/help/rest/uiperturbation.txt new file mode 100644 index 0000000..4195af9 --- /dev/null +++ b/help/rest/uiperturbation.txt @@ -0,0 +1,37 @@ +.. _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 |