net.sourceforge.webcompmath.applets
Class IntegralCurves

java.lang.Object
  java.awt.Component
      java.awt.Container
          java.awt.Panel
              java.applet.Applet
                  javax.swing.JApplet
                      net.sourceforge.webcompmath.applets.GenericGraphApplet
                          net.sourceforge.webcompmath.applets.IntegralCurves

All Implemented Interfaces:

java.awt.event.ActionListener, java.awt.event.ItemListener, java.awt.image.ImageObserver, java.awt.MenuContainer, java.io.Serializable, java.util.EventListener, javax.accessibility.Accessible, javax.swing.RootPaneContainer

public class IntegralCurves
extends GenericGraphApplet

This applet displays a vector field (f1(x,y),f2(x,y)) and integral curves for that vector field (although the integral curve feature can be turned off with an applet param). The drawing of the curves is animated; they are drawn segment-by-segment. In the default setup, a curve is started when the user clicks on the canvas. A curve can also be started by entering the starting x and y coords in a pair of text input boxes and clicking a button.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class javax.swing.JApplet

javax.swing.JApplet.AccessibleJApplet

Nested classes/interfaces inherited from class java.applet.Applet

java.applet.Applet.AccessibleApplet

Nested classes/interfaces inherited from class java.awt.Panel

java.awt.Panel.AccessibleAWTPanel

Nested classes/interfaces inherited from class java.awt.Container

java.awt.Container.AccessibleAWTContainer

Nested classes/interfaces inherited from class java.awt.Component

java.awt.Component.AccessibleAWTComponent, java.awt.Component.BaselineResizeBehavior, java.awt.Component.BltBufferStrategy, java.awt.Component.FlipBufferStrategy

Field Summary

Fields inherited from class net.sourceforge.webcompmath.applets.GenericGraphApplet

canvas, computeButton, defaultFrameSize, exampleMenuPanel, fontSize, frameTitle, functionInput, ggBGColor, ggFGColor, inputPanel, lbf, limitsPanel, mainController, mainPanel, parameterDefaults, parser, pBGColor, presentation, xVar

Fields inherited from class javax.swing.JApplet

accessibleContext, rootPane, rootPaneCheckingEnabled

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

IntegralCurves()

Method Summary

void	actionPerformed(java.awt.event.ActionEvent evt) React if user presses return in xStart or yStart, or pass evt on to GenericGraphApplet
protected void	doLoadExample(java.lang.String example) This method is called when the user loads an example from the example menu (if there is one).
void	extendCurves() Add the next segment to each integral curve.
protected void	setUpBottomPanel() Override this to make a panel containing controls.
protected void	setUpCanvas() Override this to add more stuff to the canvas.
protected void	setUpParser() create the "y" variable; also set up some parameter defaults.
void	startCurve(double x, double y) Start an integral curve at the point (x,y)
void	stop() stop animator when applet is stopped

Methods inherited from class net.sourceforge.webcompmath.applets.GenericGraphApplet

addCanvasBorder, destroy, doLoadFirstExample, getColorParam, getColorParam, getNumericParam, getNumericParam, getParameter, getParameter, init, itemStateChanged, makeAxes, parseTableFuncDef, setUpExampleMenu, setUpLimitsPanel, setUpMainPanel, setUpParameterDefaults, setUpTopPanel

Methods inherited from class javax.swing.JApplet

addImpl, createRootPane, getAccessibleContext, getContentPane, getGlassPane, getGraphics, getJMenuBar, getLayeredPane, getRootPane, getTransferHandler, isRootPaneCheckingEnabled, paramString, remove, repaint, setContentPane, setGlassPane, setJMenuBar, setLayeredPane, setLayout, setRootPane, setRootPaneCheckingEnabled, setTransferHandler, update

Methods inherited from class java.applet.Applet

getAppletContext, getAppletInfo, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, getParameterInfo, isActive, newAudioClip, play, play, resize, resize, setStub, showStatus, start

Methods inherited from class java.awt.Panel

addNotify

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getInsets, getLayout, getListeners, getMaximumSize, getMinimumSize, getMousePosition, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paint, paintComponents, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, removeAll, removeContainerListener, removeNotify, setComponentZOrder, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, transferFocusBackward, transferFocusDownCycle, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusUpCycle

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

IntegralCurves

public IntegralCurves()

Method Detail

setUpParser

protected void setUpParser()

create the "y" variable; also set up some parameter defaults.

Overrides:

setUpParser in class GenericGraphApplet

setUpCanvas

protected void setUpCanvas()

Override this to add more stuff to the canvas.

Overrides:

setUpCanvas in class GenericGraphApplet

setUpBottomPanel

protected void setUpBottomPanel()

Override this to make a panel containing controls. This is complicated because it's possible to turn off a lot of the inputs with applet params.

Overrides:

setUpBottomPanel in class GenericGraphApplet

actionPerformed

public void actionPerformed(java.awt.event.ActionEvent evt)

React if user presses return in xStart or yStart, or pass evt on to GenericGraphApplet

Specified by:

actionPerformed in interface java.awt.event.ActionListener

Overrides:

actionPerformed in class GenericGraphApplet

Parameters:

evt - event created when user presses return

startCurve

public void startCurve(double x,
                       double y)

Start an integral curve at the point (x,y)

Parameters:

x - the x coordinate

y - the y coordinate

extendCurves

public void extendCurves()

Add the next segment to each integral curve. This function is called repeatedly by the animator.

doLoadExample

protected void doLoadExample(java.lang.String example)

This method is called when the user loads an example from the example menu (if there is one). It overrides an empty method in GenericGraphApplet. For the IntegrapCurves applet, the example string should contain two expression that defines the vector field, separated by a semicolon. This can optionally be followed by another semicolon and a list of numbers, separated by spaces and/or commas. The first four numbers give the x- and y-limits to be used for the example. If they are not present, then -5,5,-5,5 is used. The next number, if present, specifies a value for delta t. If there are more numbers, they should come in pairs. each pair specifies a point where a curve will be started when the example is loaded. There is a 0.5 second delay between loading and starting the curves to allow time for the redrawing (although it seems to block the redrawing, at least on some platforms).

Overrides:

doLoadExample in class GenericGraphApplet

Parameters:

example - the function to graph

stop

public void stop()

stop animator when applet is stopped

Overrides:

stop in class java.applet.Applet