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[java] Faster smoother input

Started by sakky Dec 18, 2002 at 1:22 PM 0 replies 300+ views

Original Post

Dec 18, 2002 at 1:22 PM

I get really jerky input from my applet. this is my code public boolean keyDown( Event e, int key ) { if ( key == Event.LEFT ) { x = x - 4; } if ( key == Event.RIGHT ) { x = x + 4; } if ( key == Event.DOWN ) { y = y + 4; } if ( key == Event.UP ) { y = y - 4; } if ( key == Event.ENTER ) { } return ( true ); } I use doule buffering and I''m having an animated gif moving along the screen. I found it easier to make the gifs animated because Java automaticly animated gifs that have frames in them. So I get more animation for less code work. Is this a bad thing? Can it be that the animated gifs are slowing the applet''s input down? Is there a way I can speed the input up?

Abob

Dec 18, 2002 at 3:34 PM

To get better response you have to use something like this

  

import java.awt.*;
import java.awt.event.*;

public class CKeyStates implements KeyListener {
private boolean[] keys = new boolean[256];
CKeyStates() {} 
public void keyPressed(KeyEvent e)
{
	int keyCode = e.getKeyCode();
	keys[keyCode] = true;
}

public void keyReleased(KeyEvent e)
{
	int keyCode = e.getKeyCode();
	keys[keyCode] = false;
}

public void keyTyped(KeyEvent e) {} // Do nothing


public boolean IsPressed(int keyCode)
{
if ((keyCode < 0) || (keyCode >= 256)) {
	return false;	
}
return keys[keyCode];
}

}

to use the class do this

//make one
CkeyStates keyboard = new CkeyStates();

// attach It to the applet
addKeyListener(keyboard);

// use it
if (keyboard. IsPressed(‘a’)) {
System.out.println(“A is down”);
}

With this class to get the arrow keys, you have to use the constants

VK_UP, VK_DOWN, VK_LEFT, VK_RIGHT

Not Event.RIGHT etc.

hope this helps

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