AddObject Method

Package

Class

Index

DataGraph addObject Method

DataGraph allows the addition of geometric shapes using the addObject method:

addObject(String name, String attributes).

Objects usually, but not always, have an on-screen representation. The first argument is the name of the object to be added, and the second is a comma-delimited list of parameters. A lens can be added using the following JavaScript statement:

id=document.physletname.addObject("box", "x=1,y=2,w=50,h=20");.

The addObject method is very forgiving since not all parameters need to be specified. Default values are overridden only if the parameter appears in the list. Incorrect and unsupported parameters do not affect the applet and are ignored.

Name	Attributes
arrow An arrow.	x- double x position of the center in world units y- double y position of the center in world units h- double horizontal component s- int size of the arrow head v- double vertical component
box A hollow rectangle.	x- double x position of the center in world units y- double y position of the center in world units h- int height in pixels w- int width in pixels
calculation text followed by a calculation. same as calculation object	x- double x position of the center in world units y- double y position of the center in world units text- string the text calc- string the calculation function, f(x,y,t)
cfunction analytic function: f(x,t)	re- string the real part. Usually Re[f(x,t)] im- string the imaginary part. Usually Im[f(x,t)] var- string the independent variable: default=x n- int the number of evaluation points xmin- double the minimum value for the independent variable xmax- double the maximum value for the independent variable centered- boolean center the wave function A function will use the graph's current xmin and xmax values if the following are not specified. Functions can be explicit functions of time. The function will animate if the clock is running.
complexdata See cfunction for analytic complex functions	centered- boolean center the wave function This object is a placeholder for a complex function that is sent using a data-connection.
caption text	x- double x position of the center in world units y- double y position of the center in world units text- string the text
circle A filled circle with radius r.	x- double x position of the center in world units y- double y position of the center in world units. r- int radius in pixels
cursor A circle with crosshair.	x- double x position of the center in world units y- double y position of the center in world units text- string the text calc- string the calculation function, f(x,y,t)
function analytic function: f(x,t)	f- string the function. Usually f(x) or f(x,t). var- string the independent variable n- int the number of evaluation points xmin- double the minimum value for the independent variable xmax- double the maximum value for the independent variable A function will use the graph's current xmin and xmax values if the following are not specified. Functions can be explicit functions of time. The function will animate if the clock is running.
graph a placeholder for the data points	No attributes. Use this parameter to determine the drawing order for the data points relative to the geometric objects.
image A gif image	x- double x position of the center in world units y- double y position of the center in world units. gif- string a gif image file- string same as gif DataGraph will search for images in the code-base directory. This is the directory containing the jar files. You may use subdirectories relative to the code-base to organize images. Example: addObject("image","file=mechanics/car.gif");
phasewheel shows angle as color See complex functions.	x- double x position of the center in world units y- double y position of the center in world units. r- int radius in pixels
protractor a protractor for measuring angles	x- double x position of the vertex in world units y- double y position of the vertex in world units. s- int base size in pixel theta- double vertex interior angle theta0- double vertex base angle fixedbase- fixes the base angle fixedsize- fixes the length of the arm
rectangle A filled rectangle.	x- double x position of the center in world units y- double y position of the center in world units h- int height in pixels w- int width in pixels
shell A hollow circle with radius r.	x- double x position of the center in world units y- double y position of the center in world units. r- int radius in pixels
tangent A tangent line with slope=rise/run.	x- double x position of the center in world units y- double y position of the center in world units h- double the rise w- double the run
text text followed by a calculation.	x- double x position of the center in world units y- double y position of the center in world units text- string the text calc- string the calculation function, f(x,y,t)
vectorfield analytic expression for a vector field	fx- string the x component fy- string the y component n- int the number of evaluation points