visad.java2d

Class KeyboardBehaviorJ2D

java.lang.Object

visad.java2d.KeyboardBehaviorJ2D

All Implemented Interfaces:

KeyboardBehavior

public class KeyboardBehaviorJ2D
extends Object
implements KeyboardBehavior

KeyboardBehaviorJ2D is the VisAD class for keyboard control of translate (pan) and zoom in Java2D.

Author:

Troy Sandblom NCAR/RAP May, 2000, Don Murray (adapted to VisAD with help from Curtis)

Field Summary

Fields

Modifier and Type	Field and Description
static int	ROTATE_Z_NEG Identifier for function to rotate negatively around the Z viewing axis (perpendicular to the screen plane)
static int	ROTATE_Z_POS Identifier for function to rotate positively around the Z viewing axis (perpendicular to the screen plane)

Fields inherited from interface visad.KeyboardBehavior

NO_MASK, RESET, TRANSLATE_DOWN, TRANSLATE_LEFT, TRANSLATE_RIGHT, TRANSLATE_UP, ZOOM_IN, ZOOM_OUT

Constructor Summary

Constructors

Constructor and Description
KeyboardBehaviorJ2D(DisplayRendererJ2D r) Construct a new keyboard behavior for the DisplayRenderer.

Method Summary

Methods

Modifier and Type	Method and Description
void	execFunction(int function) Executes the given function.
void	mapKeyToFunction(int function, int keycode, int modifiers) Maps key represented by keycode & modifiers to the given function.
void	processKeyEvent(KeyEvent event) Process a key event.

Methods inherited from class java.lang.Object

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

Field Detail

ROTATE_Z_POS

public static final int ROTATE_Z_POS

Identifier for function to rotate positively around the Z viewing axis (perpendicular to the screen plane)

See Also:

Constant Field Values

ROTATE_Z_NEG

public static final int ROTATE_Z_NEG

Identifier for function to rotate negatively around the Z viewing axis (perpendicular to the screen plane)

See Also:

Constant Field Values

Constructor Detail

KeyboardBehaviorJ2D

public KeyboardBehaviorJ2D(DisplayRendererJ2D r)

Construct a new keyboard behavior for the DisplayRenderer. You need to add the behavior to the DisplayRenderer if you want to use it. Default keys for manipulations are as follows:
Translation

• Arrow keys - translate up, down, left, right

Zoom

• Shift + Up arrow - zoom in (ZOOM_IN)
• Shift + Down arrow - zoom out (ZOOM_OUT)

Rotate

• Shift + Left arrow - rotate left (ROTATE_Z_POS)
• Shift + Right arrow - rotate right (ROTATE_Z_NEG)

Reset

• Ctrl + R key - reset to original projection (RESET)

Parameters:

r - DisplayRenderer to use.

See Also:

DisplayRendererJ2D.addKeyboardBehavior(KeyboardBehaviorJ2D behavior)

Method Detail

mapKeyToFunction

public void mapKeyToFunction(int function,
                    int keycode,
                    int modifiers)

Maps key represented by keycode & modifiers to the given function. Each function can only have one key/modifier combination assigned to it at a time.

Specified by:

mapKeyToFunction in interface KeyboardBehavior

Parameters:

function - keyboard function (ROTATE_X_POS, ZOOM_IN, etc)

keycode - KeyEvent virtual keycodes

modifiers - InputEvent key mask

See Also:

KeyEvent, InputEvent

processKeyEvent

public void processKeyEvent(KeyEvent event)

Process a key event. Determines whether a meaningful key was pressed.

Specified by:

processKeyEvent in interface KeyboardBehavior

Parameters:

even - KeyEvent stimulus

execFunction

public void execFunction(int function)

Executes the given function.

Specified by:

execFunction in interface KeyboardBehavior

Parameters:

function - function to perform (TRANSLATE_UP, ZOOM_IN, etc)