1. circle - a filled circle lower left corner at (x,y) specify: radius in pixels
2. rectangle - a filled rectangle, centre at (x,y) specify: height and width in pixels
3. shell - a hollow circle, centre at (x,y) specify: radius in pixels
4. box - a hollow rectangle, centre at (x,y) specify: radius in pixels
5. box - a circle with cross hairs, centre at (x,y) specify: height and width in pixels (and thickness of border in pixels - but this feature doesn't work yet)
>>> tt >>> Add shape s|type|circle;rectangle;shell;box;cursor|shape: \$ .|d|x|1.0|x: .|d|y|0.0|y: .|i|w||width: .|i|h||heigth: .|i|r||radius: addObject|arr #FFDA92 >>> tt >>> Arrows are often animation slaves of other objects. >>> tt >>> Add arrow s|name|arrow|HIDDEN \$ .|d|x|1|x: .|d|y|1|y: .|s|h|1|horizontal: .|s|v|1|vertical: addObject|txt #FFDA92 >>> tt >>> Add a text x- double x position of the left side of the text in world units y- double y position of the top of the text in world units text- string static text. calc- string An analytic function to be evaluated. The calculation is displayed to the right of the static text.
Text objects are often slaved to other objects. If a text object is slaved to an object, it takes on the properties of that object. In this Physlet, a slaved text object can evaluate a function of t, x, y, bx, by, i, curl, and path.
Note: The curl of the field is evaluated at the position, (x, y). The path is the line integral evaluated along the perimeter of a shell or a box object.
Note: To change the decimal format of the calculation use the setFormat method with the generated txt-variable as object. >>> tt >>> Add text s|name|text|HIDDEN \$ .|d|x|0|x: .|d|y|0.5|y: .|s|text|your text|text: .|s|calc||calculate: addObject|id #FFDA92 >>> tt >>> An image file. >>> tt >>> Add image s|name|image|HIDDEN \$ .|d|x|3.0|x: .|d|y|0.5|y: .|s|file|smile.gif|file: addObject|cap #FFDA92 >>> tt >>> A caption is text that is centered near the top of the screen. Specify: x- double x position of the center in world units y- double y position of the center in world units text- string text of the caption Use the generated cap-Variable as object for "change color" >>> tt >>> Title s|name|caption|HIDDEN \$ .|d|x|1.0|x: .|d|y|-0.5|y: .|s|text|your title|text: setDragable| #FFFF99 >>> tt >>> Make an object relocatable with the mouse. Use the id (variable) returned by the add methods to identify the object you wish to change.

Parameters:
id - the object identifier
drag - true if dragable
Returns:
true if successful >>> tt >>> make dragable o|id||This object b|drag|true|is dragable: setResizable| #FFFF99 >>> tt >>> Make an object resizable. A resizable object will usually change its physical properites. For example, a resizable lens will change
its focal length.

Parameters:
id - the object identifier.
resizable - property
Returns:
true if successful. >>> tt >>> make resizable o|id||This object b|isResizable|true|is resizable: setVisibility| #FFFF99 >>> tt >>> Makes an object visible or invisible. The object is not destroyed; it is hidden and can be made visible at any time. >>> tt >>> Show/Hide o|id||This object b|show|false|is visible: setAnimationSlave| #FFFF99 >>> tt >>> Combine a master object and a slave object so that the slave follows the master. Slave could be a text - often in combination with a "display offset" for the text (see below) >>> tt >>> Animation Slave o|masterID||master object: o|slaveID||following object: addObject|constr #FFFF70 >>> tt >>> Specify a region to which other objects can be bound. Then use the newly generated ID "constr.." in a setContraint() command to apply this restriction to an object. >>> tt >>> Constraint region s|name|constraint|HIDDEN \$ .|d|xmin||xmin: .|d|xmax||xmax: .|d|ymin||ymin: .|d|ymax||ymax: setConstraint| #FFFF70 >>> tt >>> Restrict the possible movements of an object to a region. This region must previously be specified as a "constraint" in a separate command. >>> tt >>> restrict motion o|id||This object o|constraintid||is restricted by this constraint (as defined above): setShowFieldVectors| #CCFFCC >>> tt >>> Show the direction field. >>> tt >>> Display field vectors b|sfv|true|show field vectors: setShowFieldLineOnDblClick| #CCFFCC >>> tt >>> Enable the user to double click in order to draw a magnetic field line. >>> tt >>> Field line doubleclick b|sfl|true|show a field line on double click: setShowFVector| #CCFFCC >>> tt >>> Enable a wire to show the net force vector acting on it. >>> tt >>> Show F vector o|id||This object b|showForce|true|shows a force vector: setShowBOnDrag| #CCFFCC >>> tt >>> Enable a the user to read the magnetic field magnitude by click-dragging the mouse. >>> tt >>> Display B b|sb|true|Show B value on drag: setShowCoordOnDrag| #CCFFCC >>> tt >>> Enable a the user to read coordinates by click-dragging the mouse. >>> tt >>> Display x,y b|sc|true|Mouse coordinates are displayed: setShowForce| #CCFFCC >>> tt >>> Show the absolute value of the force of a dragable object (in yellow box, behind the coordinates). Default: true >>> tt >>> Display F o|id||This object b|showForce|false|displays its force value: setShowInfo| #CCFFCC >>> tt >>> Enable a dragable object to show information such as the current on drag >>> tt >>> Display info o|id||This object b|showInfo|true|displays info on drag: setSketchMode|id #CCFFCC >>> tt >>> Enable sketching with the mouse. >>> tt >>> Sketch mode b|sketch|true|Users can draw sketches with mouse in applet: setDisplayOffset| #B3EFFF >>> tt >>> Offset the object's position on the screen from its default drawing position. >>> tt >>> Display offset o|id||For This object i|xOff|20|xo: i|yOff|20|yo: swapZOrder| #B3EFFF >>> tt >>> Swap the drawing order on the screen. >>> tt >>> Foreground/ Background o|id1||This object: o|id2||swaps z-order with this object: setObjectFont| #B3EFFF >>> tt >>> change the object's font for any text that is displayed. >>> tt >>> Object font o|id||For this text object: s|family||font family: i|style|20|style: i|size|20|size: setRGB| #B3EFFF >>> tt >>> Set the red, green, and blue color values for a wire or coil that has already been created. >>> tt >>> Color o|id||This object i|r|20|has color components r: i|g|20|g: i|b|20|b: getBx|bx #E9D3FF >>> tt >>> Get the x component of the B field at a point. >>> tt >>> Get Bx d|x|1.0|x: d|y|1.0|y: getBy|by #E9D3FF >>> tt >>> Get the y component of the B field at a point. >>> tt >>> Get By d|x|1.0|x: d|y|1.0|y: setCurrent| #FF707D >>> tt >>> Change the current of a wire or loop after it has been created. This can be performed by sliders. >>> tt >>> Set I o|id||This object d|c|1.0|has current I: setBFunctions| #FF707D >>> tt >>> Set an external magnetic field in a rectangular array >>> tt >>> Set B s|bx||Bx(x,y): s|by||By(x,y): d|xmin|1.0|xmin: d|xmax|1.0|xmax: d|ymin|1.0|ymin: d|ymax|1.0|ymax: setRadius| #FF707D >>> tt >>> Change the radius (in world units) of a loop after it has been created. >>> tt >>> Set r o|id||This object d|r|1.0|has radius r: setXY| #FF707D >>> tt >>> Set position of an object. >>> tt >>> Set x,y o|id||This object d|x|1.0|has coordinates x: d|y|1.0|y: reset| #FFFFFF >>> tt >>> Reset the applet and clear the field lines. >>> tt >>> Reset setDefault| #FFFFFF >>> tt >>> Clear all the wires and coils and set the applet into a predefined state. >>> tt >>> set default