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Particle

Particle: An interactive particle.

 

A particle is a 2D drawing element that displays a simple geometrical shape (a rectangle or an ellipse), at given coordinates of the parent drawing or plotting panel. The shape is drawn relative (see the Position property) to the given coordinates with the size specified in each direction. The element can also be applied a rotation and a scale factor for each coordinate.

 

Particles respond to user interaction on their position coordinates (changing their position), invoking up to five different actions.

 

Object wrapped

 

The object wrapped by this element is of the class org.opensourcephysics.displayejs.InteractiveParticle. The class has been designed to control all of its features through properties, so there is no need to use directly any of the object methods.

 

Useful methods

  • (This list deliberately left empty.)

 

Properties

 

Position and Size
NameDescriptionValues accepted
XThe X coordinate for the element.A constant or variable of type double or int.
YThe Y coordinate for the element.A constant or variable of type double or int.
Size XThe size of the element in the X direction.A constant or variable of type double or int.
Size YThe size of the element in the Y direction.A constant or variable of type double or int.
Pixel SizeWhether the size of the element is given in pixels. By default (i.e. false) the size of the element is relative to its parent panel coordinate system.A boolean variable or one of the constants true or false.
Scale XThe scale factor for the element in the X direction.A constant or variable of type double or int.
Scale YThe scale factor for the element in the Y direction.A constant or variable of type double or int.
Visibility and Interaction
NameDescriptionValues accepted
VisibleThe visibility of the element.A boolean variable or one of the constants true or false.
DraggableWhether the element can be moved.A boolean variable or one of the constants true or false.
SensitivityThe size of the hot spot (in pixels).A constant or variable of type int, 0 makes the full particle the hot spot.
On PressThe action to invoke when the element is pressed.The Java code to invoke for the action.
On DragThe action to invoke when the element is dragged.The Java code to invoke for the action.
On ReleaseThe action to invoke when the element is released.The Java code to invoke for the action.
On EnterThe action to invoke when the mouse enters the element.The Java code to invoke for the action.
On ExitThe action to invoke when the mouse leaves the element.The Java code to invoke for the action.
Graphical Aspect
NameDescriptionValues accepted
StyleThe drawing style for the element.Use the editor provided or read about particle styles.
PositionThe exact drawing position relative to the element's coordinates.Use the editor provided or read about positions.
RotateThe (counter-clockwise) rotation angle to apply to the element.A constant or variable of type double for an angle in radians, or a constant or variable of type int for an angle in degrees.
Line ColorThe color used for the lines of the element.Use the editor provided or read about colors.
Fill ColorThe color used to fill the element.Use the editor provided or read about colors. The special value null draws a hollow element.
StrokeThe thickness and line style for the lines of the element.A constant or variable of type double or int indicates the thickness. Default is 1. For more sophisticated strokes, read about strokes?.

 

 

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Page last modified on January 01, 2008, at 11:32 PM