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[java] Key Event problems

Started by shtkn Dec 11, 2001 at 10:56 AM 1 replies 600+ views

Original Post

Dec 11, 2001 at 10:56 AM

Hey all, I''m planning to make a Street Fighter - ish game, and am in need of some help. Obviously, the game will be in java, and as such I use the Key Event listener to listen for keyboard presses. However, the problem is that the keyboard presses can only detect one key at a time. So essentially, I am only limited to having one character move at a time only. Is there any way around this problem? My teacher said that using keys like Control, Alt, Shift would do the trick, but I want to avoid that so the player can have a keyboard configuration that makes sense. Any help would be appreciated, Kevin Hsu

mill-o

Dec 11, 2001 at 12:07 PM

i had the same problem with my car game. i couldn't accelerate and turn the car at the same time.

so when i got an KeyEvent which was VK_UP, i simply put a boolean in my car class that it should accelerate, as in car.up(true) and then the car would move etc.

    
public void keyPressed(KeyEvent e) {
	int key = e.getKeyCode();
	
	// controls

	if (key == e.VK_DOWN)
		car1.down(true);
	if (key == e.VK_UP)
		car1.up(true);
	// and so on

}

// and this is in my car class

public void move(int dt) {
	if (up)
		accelerate(dt);
	if (down)
		brake(dt);
	// and so on

}

Edited by - mill-o on December 11, 2001 1:08:16 PM

Kanzetsu

Dec 16, 2001 at 9:00 AM

Create an array of booleans called something like keysDown, and on keyPressed() set the item in the array corresponding to the pressed key to true. On keyReleased, set it to false. This way, you won't have the "type delay" problem and you can handle multiple pressed keys.

      
boolean [] keysDown;

...

keysDown = new boolean[256];
for (int i = 0; i < 256; i++)
  keysDown[i] = false;

...

void keyPressed(KeyEvent e) {
  keysDown[(e.getKeyCode())] = true;
}
void keyReleased(KeyEvent e) {
  keysDown[(e.getKeyCode())] = false;
}
boolean keyIsDown(int key) {
  return keysDown[key];
}

// Kanzetsu

UPDATE: oops, looks like I had messed up the return type of keyIsDown()

Edited by - Kanzetsu on December 17, 2001 5:20:45 AM

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