Board properties

• General
• Background
• Grid
• Coordinate system
• Conditions

General

Every  -construction has a name (e.g. board 5) in the title bar, which can be changed in the field "Name".

Moreover the author and a comment can be entered in the respective fields.

"File name" indicates to which file the current board gets saved.

By clicking the appropriate checkbox "AntiAlias" can be switched on and off under "Further Properties".
The size of object names and texts on the board can be adjusted with the drop box "Font size". The default size is 15.

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Background

The  -board is white by default. A different color can be chosen using the color tool.

To include a background image, it is enough to click on "Load Image". A dialogue will open up which allows you to choose an image file (GIF-, JPG- or PNG-format).
The position of the image as well as its size can be changed by entering the x- and y-coordinate of the top left corner, the width and the height in the respective fields.
The background picture can be removed by using the button "Delete".

Notice

When saving the board the background image is included in the  -File.

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Grid

The color of the grid can be changed under "Grid Color". It is possible to either click on one of 16 pre-defined colors or enter the red, green, blue values of a user defined color.

Both fields "Grid line per unit" define into how many parts a unit of the coordinate system is divided into by grid lines. It is possible to either use the default values or enter different ones.
If the distance between to grid lines is less than 10 screen pixels, the grid lines will not be displayed.

If  Snap is active, points snap to the board's grid. If the check box "Snap to points only" is checked, points will only snap to already existing points.

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Coordinate system

"Pixels per unit" determines the number of screen pixels that correspond to one unit under  Zoom 100%.

"Caption of axis" allows the user to change the caption of the axes.

If the checkbox "Show unit" is active, a line segment of length 1 is displayed in the upper left corner of the board.

Using the checkbox "Hide thick labels" shows the respective axis without labels.

The numbers at the axes can be furnished with units, using "Multiples of". E.g. using the input "Multiples of" cm leads to the labels 1 cm, 2 cm, 3 cm ...

The option "axis as object" is activated by default, so that the respective axis can be used as a line on the board. This enables one to create points of intersection with the axis. Points that are put on axes are line sliders.

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Conditions

name.schl├╝sselwort=berechnung name names the object, keyword determines the property and calculation determines the new value of the property. All functions of the   algebra system are available for calculation. More information can be found under Calculations.

 

Adding a condition

As a first step the new condition has to be created. This is done by clicking the symbol "New Condition".

Then the condition can be entered.

Next the condition has to be saved.   automatically tests whether the respective object exists.

The condition is included into the list of all conditions.

The button "Close" or "Apply" must be clicked, in order for the new condition to take effect.

 

Changing a condition

To change a condition it must be selected in the list of all conditions. It then appears in red in the text field. After the desired changes are made they have to be affirmed by clicking the floppy disk symbol.

Deleting a condition To delete a condition it firstly has to be selected in the list of all conditions and then be deleted by clicking the "Delete"-symbol.

The condition is not in the list anymore.

Examples

• A.x=5 makes the x-coordinate of point A always having a value of 5.
• B.stroke=If(X(B)>0,"#ff0000","#0000ff") displays point B in red if its x-coordinate is less than 0. Otherwise it is displayed in blue.
• T1.visible=If(Y(C)>1,True,False) shows the text T1 as soon as the y-coordinate of point C is greater than 1. If this is not the case the text will not be displayed.

Overview of all possible keywords

Object	Keyword	Type	Meaning	Value
Keywords applying to all objects	area	int	Sensitive area	Integers
	dash	int	Line style	0, 1, 2, ..., 7
	draft	boolean	Object in draft mode	False / True
	draftcolor	Color	Color in draft mode	hexadecimal color code
	fill	Color	fill color	hexadecimal color code
	info	String	information of object	text
	label	Color	color of label	hexadecimal color code
	lighting	Color	color when selected	hexadecimal color code
	showinfo	boolean	Show information of object	False / True
	stroke	Color	Color of outline	hexadecimal color code
	strokewidth	double	line width	decimal fraction
	trace	boolean	trace mode	False / True
	visible	boolean	visible	False / True
line	editable	boolean	Possibility to change between line, ray and line segment	False / True
	first	boolean	Extended beyond starting point	False / True
	last	boolean	Extended beyond end point	False / True
slider	animated	boolean	Animation of slider	False / True
	direction	boolean	Slider's direction	False / True
	free	boolean	Free slider form carrier object	False / True
	position	double	Slider's position on the carrier object	decimal fraction
Arc	firstarrow	boolean	Display the arrowhead counterclockwise	False / True
	fullcircle	boolean	Display the complete circle with effects on the behaviour of sliders	False / True
	lastarrow	boolean	Display the arrowhead clockwise	False / True
Punkt	constructionline	boolean	Indicate the lines of intersection around points of intersection	False / True
	coordinates	boolean	Display coordinates of a point	False / True
	fix	boolean	Fixing the position of a point	False / True
	style	int	Point style	0, 1, 2, ..., 13
	x	double	x-coordinate of the point	Dezimalbr├╝che
	y	double	y-coordinate of the point	Dezimalbr├╝che
Text	autodigits	boolean	Automatically determine the number of decimal places for calculations	False / True
	digits	int	Number of decimal places for calculations	0, 1, ..., 5
	fix	boolean	Fixing the position of text	False / True
	x	double	x-coordinate of the text	decimal fraction
	y	double	y-coordinate of the text	decimal fraction
arc	radius	double	Radius of the arc	decimal fraction
	text	String	Label of angle	text

 

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•  object properties
•  Grid
•  Snap
•  coordinate system
•  Calculations