Creating geometric elements

Through the variable board new geometry elements can be added to the board. All elements are added with the method createElement():

board.createElement('point', [1,3], {name:'A', strokecolor:'red'});

Another example:

board.createElement('point', [function(){return s.X();},function(){return t.X()}], {trace:true});

The parameters of createElement() are:

board.createElement(elementType, parentElements, attributes);

where

• elementType is a string containing the type of the element which is constructed. At the moment, possible types are:
  • primitive elements like points and lines
  • composite elements like bisectors, midpoints
• parentElements is an array containing the parameters which define the element. This can be parent elements like two points which define a line. It can also consist of JavaScript functions, numbers, and strings containing GEONExT syntax. The possible array elements depend on the element type.
• attributes is a JavaScript object. Usually it is given in the "literal object" form

{key1:value1, key2:value2, ...}

Point is an easy example.

• Properties of a point:
  • style
  • strokeColor
  • strokeWidth
  • fillColor
  • highlightStrokeColor
  • highlightFillColor
  • labelColor
  • visible
  • fixed
  • draft
  • trace
• Additional properties of a line:
  • straightFirst
  • straightLast

There are no additional properties of a circle

• Additional properties for an element:
  • needsRegularUpdate = [true]/false (eg axis are set to needsRegularUpdate=false) These elements are updated only, if the origin of the board is moved or after zooming
• Possible parameters:

el.setProperty('key1:value1','key2:value2',...);
el.setProperty([key1:value1],[key2:value2],...);
el.setProperty({key1:value1, key2:value2},...);