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Set of trails

A set is just an empty element, that can host other elements (and sets). As such, a set has a position and a size, and accepts a transformation, but you need to add other elements to the set to make it display anything on the panel. The great advantage of sets is that they allow manipulation of collections of other drawables as a whole.

 

Underlying object: A Set of Elements, each of which is an ElementTrail.

 

Properties

TrailSet2D  
Number of elements  
Name Description Values accepted Default
#Elements The number of elements in the set. An integer value.
Input  
Name Description Values accepted Default
Input X The X coordinate of the point to add. A constant or variable of type double, int or double[].
Input Y The Y coordinate of the point to add. A constant or variable of type double, int or double[].
Position and Size  
Name Description Values accepted Default
Pos X The X coordinate for the elements. A constant or variable of type double, int or double[].
Pos Y The Y coordinate for the elements. A constant or variable of type double, int or double[].
Position [] The double[][] array with the coordinates of the elements. A double matrix.
Size X The size of the elements in the X direction. A constant or variable of type double, int or double[].
Size Y The size of the elements in the Y direction. A constant or variable of type double, int or double[].
Size [] The double[][] array with the size of the elements in each direction. A double matrix.
Transform The transformation to apply to this element. Use the editor provided or read more about 2D transformations.
Visibility and Interaction  
Name Description Values accepted Default
Menu Entry The name to display in the simulationīs corresponding elements menu entry. A String constant or variable.
Visible The visibility of the elements. A boolean variable or a boolean array with true or false values.
Measured Whether the element affects its parent panel’s autoscaling. A boolean variable or a boolean array with true or false values.
Draggable Whether the elements can be moved. A boolean variable or a boolean array with true or false values.
Drag Group Whether dragging the element affects its group. A boolean variable or a boolean array with true or false values.
Sensitivity The size of the hot spots (in pixels). A variable or array within integer values, 0 makes the full particle the hot spot.
Interaction Index The index of the element affected by the interaction. An integer value.
On Press The action to invoke when the element is pressed. The Java code to invoke for the action.
On Drag The action to invoke when the element is dragged. The Java code to invoke for the action.
On Release The action to invoke when the element is released. The Java code to invoke for the action.
On Enter The action to invoke when the mouse enters the element. The Java code to invoke for the action.
On Exit The action to invoke when the mouse leaves the element. The Java code to invoke for the action.
Graphical Aspect  
Name Description Values accepted Default
Max Points The maximum number of points of the element. A constant or variable of type int. Use an array to assign a maximum to each element.
Clear at Input Whether to clear old data whenever new data gets in. A boolean variable or a boolean array with true or false values.
Skip The number of input points to skip before plotting one. A constant or variable of type int. Use an array to assign a different value to each element.
Active Whether the element actually accepts input data. A boolean variable or a boolean array with true or false values.
No repeat Whether to ignore equal succesive points. A boolean variable or a boolean array with true or false values.
Connected Whether to connect each point to the next one. A boolean variable or a boolean array with true or false values.
Line Color The color used for the lines of the element. Use the editor provided or read about colors.
Line Width The thickness for the lines of the element. A constant or variable of type double or int indicates the thickness. Use an array to assign the thickness to each element. 1
Table Labels
Name Description Values accepted Default
X Data Col The label for the X column when displayed in a data tool. A constant or variable of type String or String[].
Y Data Col The label for the Y column when displayed in a data tool. A constant or variable of type String or String[].

 

Methods

 

  • org.opensourcephysics.drawing2d.Element getElement(int index); returns the element in the set with that index. You may need to typecast the result to apply some methods, as in,

org.opensourcephysics.drawing2d.ElementTrail firstTrail = (org.opensourcephysics.drawing2d.ElementTrail) getElement(0);


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Page last modified on February 27, 2013, at 01:44 PM