com.seisw.util.geom.demo
Class PolyCanvas

java.lang.Object
  java.awt.Component
      java.awt.Container
          javax.swing.JComponent
              com.seisw.util.geom.demo.PolyCanvas

All Implemented Interfaces:

java.awt.image.ImageObserver, java.awt.MenuContainer, java.io.Serializable

public class PolyCanvas

extends javax.swing.JComponent

PolyCanvas is the central UI object of the PolyDemo application. It allows the user to put points on the canvas to define a complex polygon of a single contour. The clipper algorithm supports more complex polygons, but the polygons created by the user are still complex enough to show the capabilities of the algorithm.

PolyCanvas can be in one of the of states specified in CanvasState. It supports the Observer/Listener pattern by accepting StateChangedListener objects and then telling these objects when a state change has been completed.

Refactoring: There is plenty of opportunity for refactoring within this class, but I'm out of time. It would be nice to create an inner class that contained a polygon and its associated list of points. It could possibly be the StatePoly class.

Author:

Dan Bridenbecker, Solution Engineering, Inc.

See Also:

Serialized Form

Nested Class Summary

Nested classes inherited from class javax.swing.JComponent

javax.swing.JComponent.AccessibleJComponent

Nested classes inherited from class java.awt.Container

java.awt.Container.AccessibleAWTContainer

Nested classes inherited from class java.awt.Component

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

Field Summary

Fields inherited from class javax.swing.JComponent

accessibleContext, listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

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

PolyCanvas()
Creates a new instance of PolyCanvas

Method Summary

void	addStateChangedListener(StateChangedListener listener) Add a listener for changes in state of the canvas.
boolean	canPerformOperations() Return true if the set operations can be performed.
void	clear() Clear the points and polygons of the canvas and reset the state to entering points for polygon 1.
double	getPolyArea1() Return the area of the polygon number 1.
double	getPolyArea2() Return the area of the polygon number 2.
double	getPolyAreaOp() Return the area of the resulting polygon of the selected set operation.
void	intersection() Change the state of the canvas to intersection.
boolean	isEnteringData() Return true if data points can be added.
boolean	isIntersectionState() Return true if the current state is intersection.
boolean	isUnionState() Return true if the current state is union.
boolean	isXorState() Return true if the current state is xor.
void	paint(java.awt.Graphics g) Draw the points and polygons.
void	startEnteringPoly1() Change the state of the canvas to entering points for Polygon 1.
void	startEnteringPoly2() Change the state of the canvas to entering points for Polygon 2.
void	stopEntering() Change the state of the canvas to stop/done.
void	union() Change the state of the canvas to union.
void	xor() Change the state of the canvas to xor.

Methods inherited from class javax.swing.JComponent

addAncestorListener, addNotify, addPropertyChangeListener, addPropertyChangeListener, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getAccessibleContext, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBorder, getBounds, getClientProperty, getComponentGraphics, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getGraphics, getHeight, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getUIClassID, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isOptimizedDrawingEnabled, isPaintingTile, isPreferredSizeSet, isRequestFocusEnabled, isValidateRoot, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, paramString, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFont, setForeground, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update, updateUI

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setLayout, 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, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, 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

PolyCanvas

public PolyCanvas()

Creates a new instance of PolyCanvas

Method Detail

paint

public void paint(java.awt.Graphics g)

Draw the points and polygons. Also display what to do message when nothing else displayed and we're in a state to add points.

canPerformOperations

public boolean canPerformOperations()

Return true if the set operations can be performed.

isEnteringData

public boolean isEnteringData()

Return true if data points can be added.

isIntersectionState

public boolean isIntersectionState()

Return true if the current state is intersection.

isUnionState

public boolean isUnionState()

Return true if the current state is union.

isXorState

public boolean isXorState()

Return true if the current state is xor.

getPolyArea1

public double getPolyArea1()

Return the area of the polygon number 1. It returns -1 if data is currently being accepted for the polygon.

getPolyArea2

public double getPolyArea2()

Return the area of the polygon number 2. It returns -1 if data is currently being accepted for the polygon.

getPolyAreaOp

public double getPolyAreaOp()

Return the area of the resulting polygon of the selected set operation. It returns -1 if the canvas is not in a set operation state.

startEnteringPoly1

public void startEnteringPoly1()

Change the state of the canvas to entering points for Polygon 1.

startEnteringPoly2

public void startEnteringPoly2()

Change the state of the canvas to entering points for Polygon 2.

stopEntering

public void stopEntering()

Change the state of the canvas to stop/done.

intersection

public void intersection()

Change the state of the canvas to intersection.

union

public void union()

Change the state of the canvas to union.

xor

public void xor()

Change the state of the canvas to xor.

clear

public void clear()

Clear the points and polygons of the canvas and reset the state to entering points for polygon 1.

addStateChangedListener

public void addStateChangedListener(StateChangedListener listener)

Add a listener for changes in state of the canvas.