Download - User Interaction

COSC 4126 User Interaction

User Interaction

capturing and respondingto

input events


Event handling in java

user action

input device

OS

JRE

AWT event queue

component event listeners

component+ event


Events – message passing

AWTEvent ... ComponentEvent

... InputEvent

KeyEvent MouseEvent

... MouseWheelEvent


Listening for events - interfaces

EventListener ... AWTEventListener all AWT events WindowListener window state KeyListener keyboard MouseListener click, press, enter MouseMotionListener move, drag MouseWheelListener


constructing a listener

create component object to capture events (window, button, etc)

create object that implements listener interface code for reacting to event

attach listener to component


Keyboard controlKeyListener methodspublic void keyTyped(KeyEvent e)

Invoked when a key has been typed. See the class description for KeyEvent for a definition of a key typed event.

(not often used in a real-time situation – includes multi-key combinations as single events)

public void keyPressed(KeyEvent e)

Invoked when a key has been pressed. See the class description for KeyEvent for a definition of a key pressed event.

public void keyReleased(KeyEvent e) Invoked when a key has been released. See the class

description for KeyEvent for a definition of a key released event.


Keyboard control

KeyEventcontains information about the event

what character, key location (eg left/right shift)multiple formats, string, unicode, ...

for games, typically a small set of key actions are used for game control; other key events are ignored; note details in Brackeen (e.g., disabling tabs and alts)

example: KeyTest.java in chapter 3


Mouse control MouseListenervoid mouseClicked(MouseEvent e)

Invoked when the mouse button has been clicked (pressed and released) on a component.

void mouseEntered(MouseEvent e) Invoked when the mouse enters a component.

void mouseExited(MouseEvent e) Invoked when the mouse exits a component.

for game interactionvoid mousePressed(MouseEvent e)

Invoked when a mouse button has been pressed on a component.

void mouseReleased(MouseEvent e) Invoked when a mouse button has been released on a component.


Mouse control

MouseEvent which button is pressed, released mouse location


Mouse control MouseMotionListenervoidmouseDragged(MouseEvent e)

Invoked when a mouse button is pressed on a component and then dragged. All dragged events go to component where button was pushed.

voidmouseMoved(MouseEvent e) Invoked when the mouse button has been moved on a component (with no buttons down).


Mouse control

MouseWheelListenervoid mouseWheelMoved(MouseWheelEvent e)

Invoked when the mouse wheel is rotated.

MouseWheelEvent extends MouseEvent number of clicks (pos or neg) number of scroll units scroll type ( by line or by page )

example: MouseTest.java


The user input “language” keyReleased(key) mousePressed(button),

mouseReleased(button)

keyPressed(key)

mouseMoved, mouseDragged mouseWheelMoved

change of state

single action

possible multiple or continuous action


User controlattaching action to inputs

interface program - game

input action

update

point of view

point of view:

display on/off, tooltips, pan/zoom


Mouselook – panning the view

(x,y)

draw fullscreen image four times at:

(x,y)

(x-w,y)

(x,y-h)

(x-w,y-h)


Mouselook – Panning with mouse

mouseMoved event calculate change in mouse position apply change to image display point (x,y) reset mouse to screen centre

example: MouselookTest.java


Robot classcontrolling mouse and keys

void keyPress(int keycode) Presses a given key.

void keyRelease(int keycode) Releases a given key.

void mouseMove(int x, int y) Moves mouse pointer to given screen coordinates.

void mousePress(int buttons) Presses one or more mouse buttons.

void mouseRelease(int buttons) Releases one or more mouse buttons.

void mouseWheel(int wheelAmt) Rotates the scroll wheel on wheel-equipped mice.

... other methods


Brackeen’s Input Manager capture input Events manage Event interpretation manage connection of Events to GameActions control when GameActions are made


InputManager class

keyActions

mouseActions

gameActions

update game state

listeners

1 - 1

remapped


InputManagerTest example

game actions

moveLeft

moveRight

jump

pause

exit

keysspace

ADP

<esc>mouse

MOUSEBUTTON1MOUSEMOVELEFT

MOUSEMOVERIGHT

events

keyPressed

keyReleased

mousePressed

mouseReleased

mouseMoved


Player class

moveLeft, moveRight, jump effect sprite Player extends Sprite class

state: jumping or normal floor: y-coordinate of normal pathvertical velocity set by jump

‘falls’ over time

0jump event


Assignments:

first individual assignment – one week two interfaces

second group assignment – Thursday topic document – team plus topic

Download - User Interaction

Top Related