Class TrackCanvas

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Canvas
              |
              +--TrackCanvas

public class TrackCanvas

extends java.awt.Canvas

implements java.awt.event.MouseListener, java.awt.event.MouseMotionListener

See Also:

Serialized Form

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Constructor Summary

TrackCanvas(java.awt.Frame parent, Track t, java.util.Observer observer)
Initialize a new track canvas.

Method Summary

java.awt.Point	getMouseCoordinates() Returns the current mouse coordinates.
static int	mapFieldCoords(float fx, float rangef, int rangex, float minf) Convert field coordinates to mouse coordinates.
void	mouseClicked(java.awt.event.MouseEvent e) Empty mouse clicked handler
void	mouseDragged(java.awt.event.MouseEvent e) Empty mouse dragged handler
void	mouseEntered(java.awt.event.MouseEvent e) Changes the cursor to a crosshair when the mouse enters the canvas.
void	mouseExited(java.awt.event.MouseEvent e) Changes the cursor back to the default cursor when the mouse exits the canvas.
void	mouseMoved(java.awt.event.MouseEvent e) Updates the current mouse position and the canvas's observer.
void	mousePressed(java.awt.event.MouseEvent e) Empty mouse pressed handler
void	mouseReleased(java.awt.event.MouseEvent e) Empty mouse released handler
void	paint(java.awt.Graphics g) Paint the image to the canvas
void	setTrack(Track t) Set the current track.
static float	unmapMouseCoords(int mx, int rangex, float rangef, float minf) Convert mouse coordinates to field coordinates.
void	update(java.awt.Graphics g) Update the underlying image object

Methods inherited from class java.awt.Canvas

addNotify

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getAlignmentX, getAlignmentY, getBackground, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getInputContext, getInputMethodRequests, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getName, getParent, getPeer, getPreferredSize, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isDisplayable, isDoubleBuffered, isEnabled, isFocusTraversable, isLightweight, isOpaque, isShowing, isValid, isVisible, keyDown, keyUp, layout, list, list, list, list, list, locate, location, lostFocus, minimumSize, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, paramString, postEvent, preferredSize, prepareImage, prepareImage, print, printAll, processComponentEvent, processEvent, processFocusEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFont, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus, validate

Methods inherited from class java.lang.Object

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

Constructor Detail

TrackCanvas

public TrackCanvas(java.awt.Frame parent,
                   Track t,
                   java.util.Observer observer)

Initialize a new track canvas.

Parameters:

frame - the canvas's parent

t - the track object to render

observer - the object to notify for position updates

Method Detail

setTrack

public void setTrack(Track t)

Set the current track.

Parameters:

t - the track object to render

update

public void update(java.awt.Graphics g)

Update the underlying image object

Parameters:

g - the graphics object to update

Overrides:

update in class java.awt.Component

paint

public void paint(java.awt.Graphics g)

Paint the image to the canvas

Overrides:

paint in class java.awt.Canvas

unmapMouseCoords

public static float unmapMouseCoords(int mx,
                                     int rangex,
                                     float rangef,
                                     float minf)

Convert mouse coordinates to field coordinates.

Parameters:

mx - the mouse's x coordinate

rangex - the range of the mouse coordinates

rangef - the range of the field coordinates

minf - the minimum x field coordinates

mapFieldCoords

public static int mapFieldCoords(float fx,
                                 float rangef,
                                 int rangex,
                                 float minf)

Convert field coordinates to mouse coordinates.

Parameters:

fx - the field's x coordinate

rangef - the range of the field coordinates

rangex - the range of the mouse coordinates

minf - the minimum x field coordinates

getMouseCoordinates

public java.awt.Point getMouseCoordinates()

Returns the current mouse coordinates.

mouseMoved

public void mouseMoved(java.awt.event.MouseEvent e)

Updates the current mouse position and the canvas's observer.

Specified by:

mouseMoved in interface java.awt.event.MouseMotionListener

Parameters:

e - the event to process

mouseEntered

public void mouseEntered(java.awt.event.MouseEvent e)

Changes the cursor to a crosshair when the mouse enters the canvas.

Specified by:

mouseEntered in interface java.awt.event.MouseListener

Parameters:

e - the mouse entered event

mouseExited

public void mouseExited(java.awt.event.MouseEvent e)

Changes the cursor back to the default cursor when the mouse exits the canvas.

Specified by:

mouseExited in interface java.awt.event.MouseListener

Parameters:

e - the mouse exited event

mouseClicked

public void mouseClicked(java.awt.event.MouseEvent e)

Empty mouse clicked handler

Specified by:

mouseClicked in interface java.awt.event.MouseListener

Parameters:

e - the mouse clicked event

mouseDragged

public void mouseDragged(java.awt.event.MouseEvent e)

Empty mouse dragged handler

Specified by:

mouseDragged in interface java.awt.event.MouseMotionListener

Parameters:

e - the mouse dragged event

mouseReleased

public void mouseReleased(java.awt.event.MouseEvent e)

Empty mouse released handler

Specified by:

mouseReleased in interface java.awt.event.MouseListener

Parameters:

e - the mouse released event

mousePressed

public void mousePressed(java.awt.event.MouseEvent e)

Empty mouse pressed handler

Specified by:

mousePressed in interface java.awt.event.MouseListener

Parameters:

e - the mouse pressed event