Introduction:

For "Functiontype: From C to C", the following options are available (the table shows the key, text from the menu, and graph(s) to which the key applies):

Key	Menu text	Applies to:
ENTER	Select area (zoom)	All graphs and diagrams.
<T>	Change diagram type	All graphs and diagrams.
Space	Julia set	"Step-by-step iteration" and "Step-by-step inverse iteration"
Backspace	Step-by-step iteration	"Orbit diagram for var. z (Julia)"
Space	Mandelbrot set	"Orbit diagram for var. z (Julia)"
Backspace	Julia set	"Orbit diagram for var. c (Mandelbrot)"
<S>	Save menu	All graphs and diagrams.
ESCAPE	To parameter menu	All graphs and diagrams.

You can use the <Cursor Up> and <Cursor Down> keys to move through the list of items, and <Enter> or the (hot)key (in front of the item) to select one.

Select area (zoom):

After you press <Enter> to activate the zoom function, you will see a help menu (press <Enter> to exit). The following table shows the keys, help text and some comments:

Key	Help text	Description
ENTER	Select area (zoom)	confirm selected area
ESCAPE	Abort selection	back to central menu
PGUP	Smaller rectangle	zoom in
PGDN	Larger rectangle	zoom out
0..9	Skip n pixels (faster)	0 = 10

There are two ways to select an area:

• The keyboard
• The mouse

There's a difference between the keyboard zoom and mouse zoom, for example: the keyboard zoom preserves the aspect ratio, which the mouse zoom does not. While moving the mouse, you can monitor the coordinates corresponding to the mouse pointer position.

Keyboard

To select an area with the keyboard, press the page up and page down keys to select the size, and the cursor keys (up, down, left and right) to change the position of the rectangle. Since this is a bit slow, you can skip pixels by using the '0' - '9' keys (the '0' key can be used to skip 10 pixels). You can move the rectangle (with the cursor keys and <Page Down> key) beyond the screen boundaries. Though it will not be visible anymore, you can monitor it's position in the status bar at the bottom of the screen. Press <Enter> to confirm the new coordinates.

Mouse

To select an area with the mouse, press the left mouse button and hold it down while dragging the pointer. Releasing the mouse button does not confirm the selected area, you can still make some adjustments in position (with the cursor keys: up, down, left and right) and in size (with the <Page Up> and <Page Down> keys). Please note that, at this point, it's not possible to change the aspect ratio.

Press <Enter> to confirm the new coordinates, or <Esc> to cancel, and go back to the central menu.

Jump to other graphs and diagrams:

This section is about switching between several graphs and diagrams, one of the things mentioned in the short description of Funiter.

Switching between diagrams

"<T> Change diagram type" opens a new window which allows you to select another diagram:

Step-by-step iteration / Step-by-step inverse iteration

The first selection is the 'graph':

1	Iteration
2	Inverse iteration
ESCAPE	Previous menu

Followed by the 'shape':

P	Point
L	Line
R	Rectangle
C	Circle
ESCAPE	Previous menu

And finally the 'coloring method':

S	Color depends on starting point
I	Color depends on iter. steps
A	All iteration steps same color
ESCAPE	Previous menu

Please refer to Complex Graphs and diagrams for a description.

Orbit diagram for variable z (Julia) / Orbit diagram for variable c (Mandelbrot)

Only one menu which allows you to select the diagram:

F	Filled-in
E	Escape time diagram
B	Boundary trace
I	Inverse iteration method *)
ESCAPE	Previous menu

*) This option only applies to "Orbit diagram for variable z (Julia)".

Switching between graphs

Switching between graphs is easy, you can select the desired graph with the cursor keys in the central menu, or press the hotkey (spacebar to go 'forward' and backspace to go 'back'):

Spacebar (SPACE): "Step-by-step iteration" / "Step-by-step inverse iteration" to "Orbit diagram for variable z (Julia)" to "Orbit diagram for variable c (Mandelbrot)".

Backspace: "Orbit diagram for variable c (Mandelbrot)" to "Orbit diagram for variable z (Julia)" to "Step-by-step iteration" / "Step-by-step inverse iteration".

When you switch between graphs, a few parameters are transfered. In some cases you can select a value for such a parameter with the mouse.

The following table shows

• The source graph.
• The hotkey in the central menu.
• The destination graph.
• The parameter(s) which will be transfered to the new graph.
• The direction in which you should move the mouse to select a value.

The "Escape value" is always recalculated.

Source	Key	Destination	Transfered value(s)	Mouse postion
"Step-by-step iteration" *)	SPACE	"Orbit diagram for variable z (Julia)"	"Real part of c" , "Imaginary part of c"	-
"Orbit diagram for variable z (Julia)"	SPACE	"Orbit diagram for variable c (Mandelbrot)"	-	-
"Orbit diagram for variable c (Mandelbrot)"	Backspace	"Orbit diagram for variable z (Julia)"	"Real part of c" , "Imaginary part of c"	c
"Orbit diagram for var. z (Julia)"	Backspace	"Step-by-step iteration" *)	All parameters **).	-

*) This includes "Step-by-step inverse iteration"

**) The source graph remains visible, in some cases (zoom function or out-of-memory) it will be recalculated.

You can monitor the value for the parameter in the status bar at the bottom of the screen. The 'jump' from "Orbit diagram for variable c (Mandelbrot)" to "Orbit diagram for variable z (Julia)" requires some explanation:

Move mouse	Change value
L-button	Julia
R-button	Inverse Julia
P	Preview Julia
ENTER	Select value
ESCAPE	Previous menu

To confirm the selected value, press <Enter> or the left / right mouse button.

<Enter> defaults to the diagram you selected.

Save menu:

"<S> - Save menu" opens a new menu with the following options:

P	Postscript (Portrait)
L	Postscript (Landscape)
X	PC Paintbrush PCX
R	Parameters
ESCAPE	Previous menu

If you select one of these items, a file selector is opened so you can enter a filename.